鄭勇+黃文海+周義+趙振剛+郭新成+陳鄭輝
基金項(xiàng)目:中國(guó)地質(zhì)調(diào)查局地質(zhì)大調(diào)查項(xiàng)目(12120113078200,1212011120494,1212010633903);
摘要:新疆備戰(zhàn)鐵礦是西天山阿吾拉勒鐵銅金成礦帶上重要的鐵礦床之一,礦區(qū)南部出露有鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖,兩者之間呈脈動(dòng)侵入接觸關(guān)系。巖石地球化學(xué)研究表明,分析樣品均屬于高硅、富鉀鈣堿性系列,富集大離子親石元素 Rb、K,虧損高場(chǎng)強(qiáng)元素,具有明顯的Ba、Sr、P、Ti負(fù)異常,輕、重稀土元素分餾明顯。LAICPMS鋯石UPb測(cè)年結(jié)果表明,鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖形成時(shí)代分別為(320.5±1.9)Ma和(306.8±1.6)Ma。依據(jù)巖石地球化學(xué)、年代學(xué),結(jié)合區(qū)域地質(zhì)資料,礦區(qū)出露的鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖為同源巖漿產(chǎn)物,可能形成于早石炭世末—晚石炭世時(shí)期的南天山洋俯沖結(jié)束向陸內(nèi)碰撞造山帶轉(zhuǎn)換階段中。
關(guān)鍵詞:鐵礦;地球化學(xué);侵入巖;鋯石;鉀長(zhǎng)花崗巖;鉀長(zhǎng)花崗斑巖;西天山;新疆
中圖分類號(hào):P588.12;P597+.3文獻(xiàn)標(biāo)志碼:A
Geochemistry, Geochronology and Geological Implication of
Intrusive Rock from Beizhan Iron Deposit of Xinjiang
ZHENG Yong1, HUANG Wenhai1, ZHOU Yi2, ZHAO Zhengang1,
GUO Xincheng1, CHEN Zhenghui3
(1. No.11 Geological Team, Xinjiang Bureau of Geology and Mineral Resources, Changji 830011, Xinjiang, China;
2. School of Earth Science and Resources, Changan University, Xian 710054, Shaanxi, China;
3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
Abstract: Beizhan iron deposit in Xinjiang is one of the important deposits of Awulale ironcoppergold metallogenic belt in the western Tianshan.Kfeldspar granite and Kfeldspar granite porphyry, which have pulsating intrusive contact relationship, are exposed in the southern of iron district. Geochemical characteristics show that the rocks are high potassium calcalkaline, enriched in large iron lithophile element (Rb and K), and relatively depleted in high field strength elements, and Ba, Sr, P and Ti are significantly negative anomaly; fractionation of light and heavy rare earth elements is obvious. Ages of Kfeldspar granite and Kfeldspar granite porphyry from Beizhan iron deposit are respectively (320.5±1.9)Ma and (306.8±1.6)Ma by the method of LAICPMS zircon UPb dating. Combined with regional geological data, the geochemical and geochronological results show that Kfeldpar granite and Kfeldspar granite porphyry exposed have the same magma source, and probably form in the tectonic setting transformed from the subduction of southern Tianshan oceans to the continental collision orogeny from Early Carboniferous to Late Carboniferous.
Key words: iron deposit; geochemistry; intrusive rock; zircon; Kfeldpar granite; Kfeldspar granite porphyry; western Tianshan; Xinjiang
0引言
新疆西天山阿吾拉勒成礦帶是中國(guó)重要的鐵銅金成礦帶之一,近年來鐵礦勘查工作取得重大進(jìn)展,相繼勘查發(fā)現(xiàn)了查崗諾爾、備戰(zhàn)、智博、敦德、松湖、霧嶺及尼新塔格—阿克薩依等多個(gè)鐵礦床,已經(jīng)成為新疆重要的鐵礦開發(fā)基地。伴隨鐵礦的勘查,該地礦床研究也取得了大量的研究成果[113],但對(duì)礦床成礦環(huán)境和成礦機(jī)制、成礦規(guī)律認(rèn)識(shí)還存在分歧和爭(zhēng)議,前人對(duì)礦床形成提出了火山巖型[1]、火山噴氣沉積改造型[2]、矽卡巖型[3]、以安山質(zhì)(玄武質(zhì))巖漿為母巖漿的巖漿礦床和熱液的復(fù)合型[45,11]、與火山活動(dòng)和巖漿熱液交代有關(guān)[6,910]等不同認(rèn)識(shí)。張作衡等對(duì)新疆西天山晚古生代典型鐵礦床地質(zhì)特征、礦化類型和形成環(huán)境進(jìn)行了分析,提出區(qū)內(nèi)鐵礦床成礦物質(zhì)來源以島弧巖漿作用所攜帶的深部鐵質(zhì)為主,并含有少量火山—次火山氣液交代圍巖所萃取的鐵質(zhì),成因?yàn)轭愇◣r型[7]。
備戰(zhàn)鐵礦位于阿吾拉勒晚古生代鐵銅多金屬成礦帶東部,距新疆和靜縣西北約130 km,是阿吾拉勒成礦帶中規(guī)模最大的礦床之一,但研究程度有限,主要是對(duì)礦區(qū)出露的大哈拉軍山組火山巖的巖石地球化學(xué)特征及其中酸性火山巖的成巖年齡[6,1115]進(jìn)行了研究。Zhang等獲得的礦區(qū)流紋巖成巖時(shí)代為301~304 Ma[6];孫吉明等獲得礦區(qū)英安巖成巖時(shí)代為(329.1±1.0)Ma[13];而有關(guān)成巖成礦時(shí)代、成礦規(guī)律的認(rèn)識(shí)還比較模糊,前人對(duì)礦區(qū)南部出露的鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖的巖石地球化學(xué)和成巖時(shí)代、構(gòu)造背景的研究比較薄弱。鑒于此,筆者對(duì)區(qū)內(nèi)鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖進(jìn)行了巖相學(xué)、巖石地球化學(xué)和LAICPMS鋯石UPb定年研究,為進(jìn)一步探討備戰(zhàn)鐵礦成礦地質(zhì)背景、成礦時(shí)代、成礦機(jī)制提供新的資料。
1區(qū)域地質(zhì)概況
備戰(zhàn)鐵礦構(gòu)造位置屬伊犁—伊賽克湖微板塊之阿吾拉勒—伊什基里克晚古生代裂谷系東部。該裂谷帶北以尼勒克斷裂為界,與博羅克努早古生代島弧相鄰;南以那拉提南緣斷裂為界,與那拉提—紅柳河縫合帶相鄰(圖1)。區(qū)域上出露的有元古宇、寒武系、奧陶系、志留系、泥盆系、石炭系、二疊系、侏羅系、第四系等地層。古元古界那拉提巖群主要為灰白—灰色眼球狀黑云斜長(zhǎng)片麻巖、糜棱巖化眼球狀黑云斜長(zhǎng)片麻巖;寒武系—奧陶系地層為含磷巖系和硅質(zhì)碳酸鹽巖沉積,志留系地層為復(fù)理石及陸緣碎屑巖沉積建造,泥盆系地層為碎屑巖碳酸鹽巖夾火山、火山碎屑巖建造;石炭系地層為一套火山巖及火山碎屑巖、正常沉積巖系;二疊系地層主體由雙峰式火山巖組合(包括玄武巖、英安巖、流紋巖)夾碎屑巖組成,侏羅系地層為陸相碎屑含煤建造,新生界為洪坡積物。
本區(qū)區(qū)域上巖漿活動(dòng)強(qiáng)烈,從元古代至古生代均有發(fā)育,以加里東晚期—海西期為主,侵入巖以中酸性巖為主,以巖基、巖株、巖脈產(chǎn)出。巖性主要為花崗巖、花崗閃長(zhǎng)巖、石英閃長(zhǎng)斑巖、閃長(zhǎng)玢巖、流紋斑巖等。志留紀(jì)火山巖以中酸性火山碎屑巖和中基性熔巖為主;泥盆紀(jì)火山巖由中酸性火山碎屑巖和熔巖組成;石炭紀(jì)火山巖發(fā)育,大哈拉軍山組和伊什基里克組、阿克沙克組在區(qū)內(nèi)分布廣泛。其中大哈拉軍山組為一套火山巖及火山碎屑巖組合,巖性為玄武巖、玄武質(zhì)安山巖、安山巖、流紋巖、霏細(xì)巖、火山角礫巖、凝灰?guī)r等。
備戰(zhàn)礦區(qū)地層出露主要為早石炭統(tǒng)大哈拉軍山組、阿克沙克組及第四系。大哈拉軍山組為主要賦礦層位(圖1),分為2個(gè)巖性段:第1巖性段分布在備戰(zhàn)礦區(qū)北部及中南部,總體走向?yàn)镋W,出露不連續(xù),下部未見底,北部以安山巖、英安質(zhì)凝灰?guī)r為主,局部夾大理巖,出露厚度183.80 m,沿走向向東厚度略增大,產(chǎn)狀總體南傾;第2巖性段分布在備戰(zhàn)礦區(qū)南翼,主要巖性為英安質(zhì)凝灰?guī)r、英安巖,局部夾含大理巖化灰?guī)r,深部鉆孔中局部夾玄武巖,總體走向?yàn)镋W向,北傾,傾角60°~83°。礦區(qū)南翼西部因鉀長(zhǎng)花崗巖等的侵入缺失部分凝灰?guī)r,巖石發(fā)生強(qiáng)烈矽卡巖化,中部的凝灰?guī)r已全部蝕變?yōu)槲◣r,東部蝕變較弱。
圖1西天山區(qū)域地質(zhì)圖和備戰(zhàn)鐵礦地質(zhì)圖
Fig.1Regional Geological Map of Western Tianshan and Geological Map of Beizhan Iron Deposit
本礦區(qū)侵入巖發(fā)育,主要為分布在礦體南部的鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖、閃長(zhǎng)玢巖以及輝綠玢巖脈等(圖1)。礦區(qū)內(nèi)發(fā)育褶皺、斷層構(gòu)造。礦區(qū)在區(qū)域上處于鞏乃斯復(fù)式向斜北翼,在礦區(qū)內(nèi)則表現(xiàn)為更復(fù)雜的緊閉復(fù)式向斜,軸面直立,總體軸向約280°,核部地層為早石炭統(tǒng)阿克沙克組的碳酸鹽巖和細(xì)碎屑巖組合,翼部為大哈拉軍山組,且向斜南翼大哈拉軍山組的英安質(zhì)火山碎屑巖被鉀長(zhǎng)花崗巖巖株侵入破壞。
礦區(qū)共圈定出6個(gè)礦體,以L3為主礦體,呈透鏡狀、脈狀、似層狀(圖1),產(chǎn)狀上表現(xiàn)為上陡下緩,目前地表沿走向控制長(zhǎng)880 m,至3 200 m標(biāo)高控制長(zhǎng)度達(dá)1 100 m;控制深度380 m,礦體最薄5.12 m,向深部急劇變厚,最厚處達(dá)294.99 m,礦體平均厚度為122.49 m。礦體中礦石的TFeO品位為23%~62%,平均品位為41.23%,礦化連續(xù),品位較為均勻。礦石礦物以磁鐵礦為主,體積分?jǐn)?shù)為20%~90%,伴有黃鐵礦、磁黃鐵礦。黃銅礦微量,偶見閃鋅礦、輝砷鈷礦、赤鐵礦、褐鐵礦等,個(gè)別光片中偶見星點(diǎn)狀自然鐵。脈石礦物主要有綠簾石、透閃石、透輝石、石榴石、電氣石、金云母、綠泥石、碳酸鹽礦物菱鎂礦、方解石及少量石英等。礦石主要結(jié)構(gòu)有自形—半自形粒狀結(jié)構(gòu)、充填結(jié)構(gòu)、交代結(jié)構(gòu)、交代假象結(jié)構(gòu)。礦石構(gòu)造主要有致密塊狀構(gòu)造、浸染狀構(gòu)造、角礫狀構(gòu)造、網(wǎng)脈狀構(gòu)造、斑雜狀構(gòu)造、紋層狀構(gòu)造。
本礦區(qū)圍巖蝕變強(qiáng)烈,廣泛發(fā)育有綠簾石化、透閃石化、陽(yáng)起石化、透輝石化、金云母化、石榴石化、綠泥石化、電氣石化、碳酸鹽化、蛇紋石化、硅化等,蝕變分帶并不明顯。根據(jù)在礦區(qū)剖面及鉆孔巖芯的觀察,初步認(rèn)為圍巖蝕變?cè)跈M向上從礦體向外圍巖表現(xiàn)為電氣石化和金云母化→矽卡巖化→碳酸鹽化和硅化。
2巖相學(xué)特征
備戰(zhàn)礦區(qū)鉀長(zhǎng)花崗巖呈淺肉紅—灰白色,在礦區(qū)南部及西部大面積出露[圖2(a)、(b)],沿110°~290°方向展布,出露南北寬1 700 m,東西長(zhǎng)大于4 000 m,延伸至礦區(qū)外。在礦區(qū)局部相變?yōu)槭⒄L(zhǎng)斑巖,與鉀長(zhǎng)花崗斑巖之間為侵入接觸關(guān)系,接觸界限清晰、截然[圖2(c)];鉀長(zhǎng)花崗斑巖呈肉紅色,礦區(qū)南部有小面積出露,呈脈狀或巖枝狀產(chǎn)出,侵位于鉀長(zhǎng)花崗巖之中,寬度370~450 m。剖面上,鉀長(zhǎng)花崗斑巖中包裹閃長(zhǎng)玢巖的捕擄體[圖2(d)],并可見大量輝綠玢巖脈穿插于鉀長(zhǎng)花崗斑巖中[圖2(e)]。依據(jù)出露巖石之間相互穿插和包裹的關(guān)系,初步分析巖體侵入的順序?yàn)殁涢L(zhǎng)花崗巖→閃長(zhǎng)玢巖鉀長(zhǎng)花崗斑巖→輝綠玢巖。同時(shí),含礦化矽卡巖沿著鉀長(zhǎng)花崗斑巖裂隙或斷裂破碎帶充填交代[圖2(f)]。
本次分析的鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖樣品采自備戰(zhàn)礦區(qū)巷道北出口約100 m的西南剖面。所采集的巖石較為新鮮,鉀長(zhǎng)花崗巖具有半自形—他形粒狀結(jié)構(gòu),主要組成礦物為鉀長(zhǎng)石和石英,其次為斜長(zhǎng)石,偶見黑云母。鉀長(zhǎng)石體積分?jǐn)?shù)為65%~70%,主要以正長(zhǎng)石為主,少見微斜長(zhǎng)石。正長(zhǎng)石可見卡式雙晶,條紋結(jié)構(gòu)發(fā)育,形態(tài)以他形粒狀為主,粒徑為0.2~07 mm[圖2(g)];石英體積分?jǐn)?shù)為20%~25%,呈他形粒狀,粒徑為0.1~1.0 mm[圖2(g)]。斜長(zhǎng)石體積分?jǐn)?shù)低于5%,以鈉長(zhǎng)石為主,聚片雙晶發(fā)育,少見環(huán)帶發(fā)育的中長(zhǎng)石[圖2(h)]。所采樣品中,暗色礦物少見,主要為黑云母,呈黃褐色,粒徑為0.1~03 mm。巖石蝕變并不強(qiáng)烈;鉀長(zhǎng)石表面渾濁,發(fā)生一定高嶺土化[圖2(i)],鈉長(zhǎng)石、中長(zhǎng)石有弱的絹云母化;黑云母發(fā)生了綠泥石化[圖2(i)],并伴有榍石、磁鐵礦析出。副礦物為鋯石、榍石、磷灰石、磁鐵礦等。
鉀長(zhǎng)花崗斑巖的礦物組成與鉀長(zhǎng)花崗巖一致。巖石具有斑狀結(jié)構(gòu),斑晶由石英、長(zhǎng)石組成,粒徑為1~4 mm。石英斑晶呈渾圓狀、聚斑狀,具不均勻消光[圖2(j)];長(zhǎng)石斑晶呈半自形—他形,可見以條紋結(jié)構(gòu)發(fā)育的正長(zhǎng)石[圖2(k)]和聚片雙晶發(fā)育的鈉長(zhǎng)石?;|(zhì)具有細(xì)粒花崗結(jié)構(gòu),主要由石英(體積分?jǐn)?shù)為30%~35%)、鉀長(zhǎng)石(體積分?jǐn)?shù)為60%~65%,包括正長(zhǎng)石和微斜長(zhǎng)石)組成[圖2(l)],少見鈉長(zhǎng)石(體積分?jǐn)?shù)為3%~5%)、黑云母(體積分?jǐn)?shù)低于3%)。副礦物為鋯石、磷灰石、磁鐵礦等。
3測(cè)試條件及方法
巖石的主、微量元素含量分析在長(zhǎng)安大學(xué)西部礦產(chǎn)資源與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室完成,主量元素分析利用X射線熒光光譜儀(LAB CENTER XRF1800)完成,分析精度優(yōu)于2%;微量元素分析利用美國(guó)熱電 X7 型ICPMS分析儀完成,分析流程參考文獻(xiàn)[16]。
圖2備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖的野外照片和顯微照片
Fig.2Outcrop Photographs and Photomicrographs of Kfeldspar Granite and Kfeldspar Granite Porphyry
from Beizhan Iron Deposit
分析鋯石的陰極發(fā)光(CL)圖像拍照和LAMCICPMS鋯石微區(qū)原位UPb定年測(cè)試在中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室完成。分析簡(jiǎn)述如下:將所采樣品經(jīng)破碎、磁選和重選后,分離出鋯石,在雙目鏡下挑選出具有代表性的鋯石,用雙面膠粘在載玻片上,放上PVC環(huán),然后將環(huán)氧樹脂和固化劑進(jìn)行充分混合后注入PVC環(huán)中,待樹脂充分固化后將樣品座從載玻片上剝離,并對(duì)其進(jìn)行拋光,直到樣品露出一個(gè)光潔的平面,使鋯石充分暴露,然后進(jìn)行鋯石CL圖像照射和LAICPMS UPb分析。LAMCICPMS鋯石微區(qū)原位UPb定年所用儀器為Finnigan Neptune型MCICPMS及與之配套的Newwave UP 213激光剝蝕系統(tǒng)。激光剝蝕所用束斑為25 μm,頻率為10 Hz,能量密度約為2.5 J·cm-2,以He為載氣。信號(hào)較小的207Pb、206Pb、204Pb(+204Hg)、202Hg用離子計(jì)數(shù)器(Multiioncounters)接收,208Pb、232Th、238U信號(hào)用法拉第杯接收,實(shí)現(xiàn)了所有目標(biāo)同位素信號(hào)的同時(shí)接收并且不同質(zhì)量數(shù)的峰基本上都是平坦的,進(jìn)而可以獲得高精度數(shù)據(jù)。均勻鋯石顆粒N(207Pb)/N(206Pb)、n(206Pb)/n(238U)、n(207Pb)/n(235U)的測(cè)試精度均為2%左右,對(duì)鋯石標(biāo)準(zhǔn)的定年精度和準(zhǔn)確度在1%左右。LAMCICPMS激光剝蝕采樣采用單點(diǎn)剝蝕的方式,數(shù)據(jù)分析前用鋯石GJ1進(jìn)行調(diào)試儀器,使之達(dá)到最優(yōu)狀態(tài),鋯石UPb定年以鋯石GJ1為外標(biāo),w(U)和w(Th)以鋯石M127(w(U)=923×10-6,w(Th)=439×10-6,w(Th)/w(U)=0.475[17]為外標(biāo)進(jìn)行校正。測(cè)試過程中,在每測(cè)定5~7個(gè)樣品前后重復(fù)測(cè)定2個(gè)鋯石GJ1對(duì)樣品進(jìn)行校正,并測(cè)量一個(gè)鋯石Plesovice,觀察儀器狀態(tài)以保證測(cè)試的精確度,數(shù)據(jù)處理采用ICPMSDataCal程序進(jìn)行[18]。測(cè)量過程中絕大多數(shù)分析點(diǎn)N(206Pb)/N(204Pb)>1 000,未進(jìn)行普通鉛校正;204Pb由離子計(jì)數(shù)器檢測(cè),w(204Pb)異常高的分析點(diǎn)可能受包體等普通鉛的影響,對(duì)于w(204Pb)異常高的分析點(diǎn)在計(jì)算時(shí)剔除,鋯石年齡諧和圖用Isoplot 3.0程序獲得。詳細(xì)的分析流程可參見文獻(xiàn)[19]。
4分析結(jié)果
4.1地球化學(xué)特征
巖石化學(xué)分析結(jié)果顯示(表1):鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖均屬于高硅、高鉀鈣堿性系列。2件鉀長(zhǎng)花崗巖中SiO2含量(質(zhì)量分?jǐn)?shù),下同)為7578%~75.88%,w(K2O)為4.79%~5.52%,w(Na2O)為280%~363%,w(K2O)+w(Na2O)為8.32%~8.42%,w(K2O)>w(Na2O),w(CaO)為0.52%~173%,w(MgO)為0.12%~0.22%,w(TFe2O3)
表1分析樣品的主量和微量元素組成特征
Tab.1Major and Trace Element Compositions in Analyzed Samples
樣品編號(hào) BZY2 ZK005673.3 BZY1 樣品編號(hào) BZY2 ZK005673.3 BZY1
w(SiO2)/% 75.78 75.88 75.65 w(Cd)/10-6 0.25 0.057 0.31
w(TiO2)/% 0.17 0.15 0.24 w(In)/10-6 0.046 0.114 0.046
w(Al2O3)/% 12.19 11.92 13.01 w(Cs)/10-6 3.08 1.72 1.79
w(TFe2O3)/% 1.86 1.20 1.94 w(Ba)/10-6 69.94 159.00 270.70
w(MnO)/% 0.07 0.05 0.06 w(La)/10-6 31.02 17.21 30.14
w(MgO)/% 0.12 0.22 0.22 w(Ce)/10-6 72.60 46.37 64.81
w(CaO)/% 0.52 1.73 0.83 w(Pr)/10-6 6.75 5.24 7.00
w(Na2O)/% 3.63 2.80 3.86 w(Nd)/10-6 21.48 23.44 22.70
w(K2O)/% 4.79 5.52 4.79 w(Sm)/10-6 3.50 5.30 3.92
w(P2O5)/% 0.02 0.02 0.04 w(Eu)/10-6 0.13 0.12 0.35
(w(K2O)+w(Na2O))/% 8.42 8.32 8.65 w(Tb)/10-6 0.49 0.89 0.57
A/CNK值 1.007 0.868 0.997 w(Dy)/10-6 2.72 6.58 3.18
固結(jié)指數(shù) 1.17 2.27 2.06 w(Ho)/10-6 0.55 1.23 0.64
堿度率 4.93 4.12 4.33 w(Er)/10-6 1.60 3.73 1.86
里德曼指數(shù) 2.16 2.10 2.30 w(Tm)/10-6 0.24 0.55 0.28
w(Li)/10-6 0.150 0.000 0.081 w(Yb)/10-6 1.62 2.92 1.90
w(Be)/10-6 3.63 3.02 2.44 w(Lu)/10-6 0.23 0.53 0.28
w(Sc)/10-6 0.51 1.49 1.04 w(Hf)/10-6 4.38 4.41 4.88
w(V)/10-6 5.22 6.78 9.35 w(Ta)/10-6 1.38 1.63 0.90
w(Cr)/10-6 8.38 39.87 7.77 w(Pb)/10-6 13.44 5.42 14.24
w(Co)/10-6 0.90 1.36 2.16 w(Bi)/10-6 0.037 0.088 0.042
w(Ni)/10-6 6.36 3.98 6.40 w(Th)/10-6 9.51 10.66 8.72
w(Cu)/10-6 69.09 17.26 25.36 w(U)/10-6 3.19 4.66 2.49
w(Zn)/10-6 29.02 8.12 31.69 w(REE)/10-6 146.74 119.68 141.88
w(Ga)/10-6 12.99 14.95 13.65 w(LREE)/10-6 135.48 97.67 128.92
w(Rb)/10-6 213.90 198.60 164.40 w(HREE)/10-6 11.27 22.01 12.96
w(Sr)/10-6 31.46 75.93 90.39 w(LREE)/w(HREE) 12.02 4.44 9.95w(Y)/10-6 16.35 34.14 19.19 w(La)N/w(Yb)N 12.93 3.98 10.72
w(Zr)/10-6 177.70 115.90 236.90 δ(Eu) 0.11 0.06 0.26
w(Nb)/10-6 22.57 17.65 16.36 δ(Ce) 1.13 1.14 1.02
注:BZY2、ZK005673.3為鉀長(zhǎng)花崗巖;BZY1為鉀長(zhǎng)花崗斑巖;w(·)為元素或化合物含量;w(·)N為元素含量球粒隕石標(biāo)準(zhǔn)化后的值;wREE為稀土元素總含量;wLREE為輕稀土元素含量;wHREE為重稀土元素含量;δ(·)表示元素異常。
為120%~1.86%,w(Al2O3)為11.92%~12.19%;里德曼指數(shù)為2.10~2.16,堿度率為4.12~4.93,A/CNK值為0.868~1.007。1件鉀長(zhǎng)花崗斑巖中w(SiO2)為75.65%,w(K2O)為4.79%,w(Na2O)為386%,w(K2O)>w(Na2O),w(K2O)+w(Na2O)為865%,w(CaO)為083%,w(MgO)為022%,w(TFe2O3)為194%,w(Al2O3)為1301%,里德曼指數(shù)為23,堿度率為433,A/CNK值為0997。
鉀長(zhǎng)花崗巖中wREE為(11968~14674)×10-6,wLREE為(9767~13548)×10-6,wHREE為(1127~2201)×10-6,wLREE/wHREE為444~1202,w(La)N/w(Yb)N 為398~1293,δ(Eu)為006~011,δ(Ce)為
113~114;鉀長(zhǎng)花崗斑巖中wREE為14188×10-6,wLREE為128.62×10-6,wHREE為1296×10-6,輕、重稀土元素分餾明顯,wLREE/wHREE為9.95,w(La)N/w(Yb)N為10.72,δ(Eu)為0.26,δ(Ce)為1.02。利用Taylor等提出的球粒隕石標(biāo)準(zhǔn)化方法[20]進(jìn)行處理,其標(biāo)準(zhǔn)化稀土元素配分模式曲線表現(xiàn)為輕稀土元素富集,具有強(qiáng)烈Eu負(fù)異常、Ce正異常(圖3)。巖石原始地幔標(biāo)準(zhǔn)化微量元素蛛網(wǎng)圖上,鉀長(zhǎng)花崗巖與鉀長(zhǎng)花崗斑巖表現(xiàn)為一致的分配模式,均富集大離子親石元素 Rb、Th、K,強(qiáng)烈虧損Ba、Sr、P、Ti(圖3)。
ws-分析樣品;wc-球粒隕石含量;wp-原始地幔含量;元素標(biāo)準(zhǔn)化數(shù)據(jù)引自文獻(xiàn)[20]
圖3備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖球粒隕石標(biāo)準(zhǔn)化稀土元素配分模式和原始地幔標(biāo)準(zhǔn)化微量元素蛛網(wǎng)圖
Fig.3Chondritenormalized REE Pattern and Primitive Mantlenormalized Trace Element Spider Diagram of
Kfeldpar Granite and Kfeldspar Granite Porphyry in Beizhan Iron Deposit
圖4備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖中鋯石陰極發(fā)光圖像
Fig.4CL Images of Zircons from Kfeldspar Granite and Kfeldspar Granite Porphyry in Beizhan Iron Deposit
4.2鋯石UPb年齡
鋯石的陰極發(fā)光(CL)圖像見圖4,分析結(jié)果見表2。鉀長(zhǎng)花崗巖(BZY2)的CL圖像顯示,鋯石以柱狀為主,少見雙錐狀,晶體長(zhǎng)度為80~265 μm。1號(hào)數(shù)據(jù)點(diǎn)鋯石具有明顯的核邊結(jié)構(gòu),核部環(huán)帶不發(fā)育,w(Th)為310.2×10-6,w(U)為1027×10-6,w(Th)/w(U)值為3.02,邊部n(206Pb)/n(238U)表面年齡為293.0 Ma。而其余17個(gè)數(shù)據(jù)點(diǎn)
表2備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖的鋯石LAICPMS同位素分析結(jié)果
Tab.2LAICPMS Isotopic Analysis Results for Zircons from Kfeldspar Granite and Kfeldspar
Granite Porphyry in Beizhan Iron Deposit
測(cè)點(diǎn)號(hào) w(Pb)/
10-6 w(Th)/
10-6 w(U)/
10-6 N(207Pb)/
N(206Pb) n(207Pb)/
n(235U) n(206Pb)/
n(238U) n(208Pb)/
n(232Th) n(232Th)/
n(238U) N(207Pb)/
N(206Pb)
年齡/Ma n(207Pb)/
n(235U)
年齡/Ma n(206Pb)/
n(238U)
年齡/Ma n(208Pb)/
n(232Th)
年齡/Ma
BZY201 108.6 310.2 102.7 0.086 5±0.000 8 0.554 3±0.006 1 0.046 5±0.000 2 0.001 4±0.000 4 3.02 1 350.0±18.5 447.8±4.0 293.0±1.2 27.8±7.1
BZY202 40.1 66.7 77.4 0.075 1±0.013 9 0.368 0±0.019 3 0.049 0±0.002 4 0.005 7±0.001 7 0.86 1 072.2±373.9 318.2±14.3 308.5±14.8 113.8±34.7
BZY205 136.4 67.9 95.4 0.141 5±0.001 4 1.045 7±0.015 1 0.053 6±0.000 3 0.013 5±0.001 2 0.71 2 255.6±17.0 726.8±7.5 336.3±2.1 270.5±24.7
BZY206 56.3 77.2 124.9 0.063 5±0.013 3 0.364 5±0.034 4 0.047 7±0.000 7 0.011 2±0.004 3 0.62 724.1±452.7 315.6±25.6 300.7±4.2 225.7±85.7
BZY207 108.3 103.3 77.3 0.112 0±0.001 2 0.820 9±0.012 2 0.053 2±0.000 5 0.008 2±0.000 6 1.34 1 831.8±18.5 608.5±6.8 333.9±2.9 164.5±11.8
BZY208 60.3 83.0 107.5 0.063 9±0.014 3 0.355 1±0.021 4 0.048 5±0.000 7 0.012 2±0.003 6 0.77 738.9±487.8 308.5±16.0 305.4±4.2 245.8±70.9
BZY209 77.2 91.1 111.8 0.055 4±0.000 6 0.396 9±0.018 1 0.051 5±0.001 7 0.009 9±0.001 2 0.82 427.8±8.3 339.4±13.1 323.5±10.2 199.3±23.6
BZY210 53.7 52.0 73.0 0.055 3±0.001 1 0.394 9±0.014 3 0.050 8±0.000 7 0.010 9±0.001 0 0.71 433.4±38.0 338.0±10.4 319.6±4.1 218.6±20.9
BZY211 101.0 106.7 109.8 0.055 0±0.000 4 0.387 2±0.003 8 0.050 9±0.000 3 0.008 8±0.000 4 0.97 413.0±14.8 332.3±2.8 320.2±1.8 177.0±8.6
BZY212 65.9 72.8 106.5 0.053 2±0.001 4 0.377 9±0.011 8 0.051 5±0.000 5 0.009 9±0.000 9 0.68 344.5±59.3 325.5±8.7 323.6±3.1 199.7±17.5
BZY213 479.6 196.3 121.1 0.210 0±0.010 4 2.285 7±0.163 5 0.070 9±0.001 7 0.027 5±0.002 0 1.62 2 905.9±80.3 1 207.9±50.6 441.4±10.3 548.9±39.1
BZY214 88.1 102.1 101.9 0.110 7±0.038 7 0.484 2±0.093 3 0.063 9±0.016 9 0.027 4±0.009 3 1.00 1 813.0±676.1 401.0±63.9 399.1±102.6 547.0±183.7
BZY215 73.9 85.0 103.3 0.057 6±0.005 3 0.385 4±0.022 6 0.051 2±0.000 7 0.008 9±0.000 8 0.82 522.3±205.5 331.0±16.5 322.1±4.2 179.5±15.1
BZY216 43.8 41.8 38.6 0.087 2±0.016 2 0.397 8±0.016 7 0.051 5±0.001 4 0.066 5±0.022 5 1.08 1 365.1±364.0 340.0±12.1 323.6±8.3 1 301.1±425.7
BZY217 38.8 37.8 72.1 0.066 2±0.012 0 0.392 5±0.036 0 0.051 3±0.001 1 0.037 9±0.019 6 0.52 813.0±387.5 336.2±26.3 322.7±6.4 751.2±382.2
BZY218 49.8 48.7 37.2 0.053 0±0.001 0 0.371 2±0.007 5 0.050 8±0.000 3 0.009 4±0.000 6 1.31 327.8±44.4 320.6±5.6 319.6±1.5 188.6±11.4
BZY219 95.1 86.5 109.7 0.111 6±0.056 8 0.396 8±0.021 8 0.051 5±0.001 2 0.019 9±0.004 3 0.79 1 825.0±1 037.9 339.3±15.9 323.7±7.2 397.7±84.3
BZY220 78.6 93.4 109.0 0.103 3±0.024 0 0.390 7±0.021 1 0.050 8±0.000 8 0.015 6±0.003 9 0.86 1 683.6±436.1 334.9±15.4 319.2±5.1 312.6±77.7
BZY101 49.9 85.4 109.7 0.052 4±0.000 5 0.363 9±0.013 1 0.049 5±0.0009 0.003 0±0.001 1 0.78 301.9±20.4 315.1±9.7 310.2±5.7 60.2±22.2
BZY102 64.0 44.6 65.1 0.057 2±0.004 6 0.358 9±0.009 0 0.049 3±0.002 0 0.011 2±0.004 0 0.69 501.9±205.5 311.4±6.7 310.2±12.1 225.4±79.2
BZY103 51.7 70.9 84.9 0.080 9±0.026 0 0.347 9±0.009 1 0.047 7±0.000 9 0.005 1±0.001 4 0.84 1 220.4±668.6 303.2±6.8 300.5±5.6 103.4±29.1
BZY104 90.9 89.9 90.7 0.055 7±0.003 2 0.365 3±0.011 5 0.049 2±0.000 9 0.008 4±0.002 6 0.99 438.9±125.9 316.2±8.5 309.9±5.7 169.3±52.1
BZY105 37.8 33.1 47.4 0.056 2±0.004 2 0.358 8±0.010 7 0.048 4±0.001 2 0.022 1±0.009 2 0.70 461.2±164.8 311.4±8.0 304.9±7.1 441.5±181.1
BZY106 84.6 88.1 93.2 0.094 3±0.022 6 0.357 1±0.011 3 0.048 9±0.000 8 0.009 1±0.002 3 0.94 1 513.9±466.8 310.0±8.4 307.8±4.7 183.2±45.4
BZY107 110.6 106.7 112.3 0.058 6±0.005 1 0.356 8±0.011 3 0.048 9±0.001 0 0.009 8±0.003 1 0.95 550.0±192.6 309.8±8.4 308.0±6.4 196.6±61.2
BZY108 52.3 43.6 48.2 0.056 4±0.004 8 0.348 3±0.007 9 0.047 9±0.000 7 0.015 7±0.005 2 0.90 464.9±195.3 303.4±5.9 301.6±4.5 314.4±103.8
BZY109 97.1 67.1 79.0 0.070 7±0.018 4 0.344 2±0.007 0 0.047 6±0.000 5 0.010 9±0.001 2 0.85 950.0±553.7 300.3±5.3 299.7±3.1 219.2±23.5
BZY110 95.8 69.7 80.5 0.186 2±0.127 6 0.372 4±0.018 0 0.048 6±0.000 4 0.013 4±0.002 5 0.87 2 708.3±1 492.9 321.4±13.3 305.8±2.7 268.3±50.4
BZY112 117.4 99.3 116.5 0.054 9±0.002 2 0.365 8±0.021 1 0.048 3±0.000 8 0.010 4±0.001 5 0.85 409.3±88.9 316.5±15.7 304.3±4.9 209.6±29.2
BZY113 73.9 60.8 60.4 0.072 2±0.011 0 0.331 9±0.005 6 0.046 0±0.000 9 0.015 4±0.005 2 1.01 992.3±311.9 291.0±4.3 290.1±5.5 309.6±102.6
BZY114 52.0 53.2 72.1 0.051 6±0.001 1 0.353 2±0.016 3 0.048 6±0.000 5 0.009 7±0.001 5 0.74 333.4±50.0 307.2±12.2 306.0±3.3 195.6±30.5
BZY115 32.5 24.4 29.5 0.058 6±0.005 2 0.354 7±0.005 0 0.048 4±0.000 3 0.014 0±0.001 0 0.83 550.0±200.9 308.2±3.7 304.6±2.0 280.7±20.6
BZY116 87.6 89.4 113.0 0.052 4±0.000 6 0.359 5±0.007 2 0.049 5±0.000 5 0.007 7±0.000 4 0.79 301.9±27.8 311.8±5.4 311.1±2.8 154.3±8.6
BZY117 61.5 48.0 82.3 0.080 6±0.017 6 0.364 3±0.010 2 0.049 6±0.001 4 0.027 1±0.014 7 0.58 1 213.0±440.9 315.4±7.6 312.3±8.7 540.8±289.1
BZY118 66.2 57.7 61.3 0.055 0±0.000 9 0.370 3±0.007 0 0.048 8±0.000 3 0.010 3±0.000 9 0.94 409.3±41.7 319.9±5.2 307.1±2.0 207.3±17.5
BZY119 45.0 45.7 85.3 0.117 3±0.055 6 0.377 0±0.029 9 0.049 5±0.001 1 0.031 5±0.013 7 0.54 1 916.7±961.1 324.8±22.1 311.5±6.4 627.3±269.2
BZY120 90.3 94.4 104.3 0.053 3±0.000 2 0.362 2±0.002 5 0.049 3±0.000 3 0.008 0±0.000 5 0.91 342.7±9.3 313.8±1.8 310.3±2.0 160.7±9.9
注:N(·)/N(·)為同一元素同位素比值,N(·)為該元素的原子豐度;n(·)/n(·)為不同元素同位素比值,n(·)為元素的物質(zhì)的量。
圖5備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖和鉀長(zhǎng)花崗斑巖鋯石UPb諧和圖和加權(quán)平均年齡
Fig.5Zircon UPb Concordia Diagrams and Weighted Average Ages from Kfeldspar Granite and
Kfeldspar Granite Porphyry in Beizhan Iron Deposit
具有清晰的震蕩環(huán)帶,w(Th)為(41.8~196.3)×10-6,w(U)為(37.2~121.1)×10-6,w(Th)/w(U)值為0.52~1.62,代表了巖漿成因鋯石(w(Th)/w(U)>04)[21]。鋯石的n(206Pb)/n(238U)表面年齡為300.7~441.4 Ma。其中:13、14號(hào)數(shù)據(jù)點(diǎn)位于鋯石核部,n(206Pb)/n(238U)表面
年齡為399.1~441.4 Ma,可能代表捕獲鋯石的年齡;其他10個(gè)數(shù)據(jù)點(diǎn)n(206Pb)/n(238U)表面年齡變化小,為319.2~323.6 Ma,數(shù)據(jù)點(diǎn)諧和性較好,n(206Pb)/n(238U)加權(quán)平均年齡為(320.5±1.9)Ma(平均標(biāo)準(zhǔn)權(quán)重偏差(MSWD)為0.24,圖5),數(shù)據(jù)置信度高于95%,該年齡可以代表巖石主體的結(jié)晶年齡。
鉀長(zhǎng)花崗斑巖(BZY1)中鋯石的CL圖像顯示(圖4),鋯石以長(zhǎng)柱狀為主,長(zhǎng)度為75~325 μm,長(zhǎng)寬比為1∶1~1∶2,具有較為清晰的震蕩環(huán)帶。鋯石w(Th)為(24.4~106.7)×10-6,w(U)為(295~1165)×10-6,w(Th)/w(U)值為054~101,代表了巖漿成因鋯石[21]。分析的19個(gè)有效數(shù)據(jù)點(diǎn)n(206Pb)/n(238U)表面年齡為291~325 Ma(表1),這些數(shù)據(jù)點(diǎn)諧和性較好,n(206Pb)/n(238U)加權(quán)平均年齡為(306.8±1.6)Ma(MSWD值為099,圖5),該年齡代表了巖石結(jié)晶年齡。
5討論
西天山地區(qū)發(fā)育大量古生代侵入巖,出露面積較大,約占30%[2223] 。侵入巖的時(shí)代集中在奧陶紀(jì)—二疊紀(jì)[2224] 。廣泛發(fā)育的320~450 Ma花崗巖地球化學(xué)特征顯示其具有島弧花崗巖的屬性[2526],暗示著志留紀(jì)—早石炭世末南天山洋一直向北持續(xù)俯沖[24] ,侵位于北天山蛇綠巖混雜巖帶巴音溝地區(qū)的偏堿性花崗巖SHRIMP鋯石UPb年齡為316 Ma[2728],表明北天山洋在早石炭世末已經(jīng)閉合,南天山洋俯沖活動(dòng)還在進(jìn)行[22,24,2728]。
西天山地區(qū)古生代火山巖分布廣泛,尤其是大哈拉軍山組火山巖,形成時(shí)代跨度較大,從西天山西段的晚泥盆世(>363 Ma)[2930]、中部新源縣城南沿那拉提北坡的早石炭世(352~355 Ma)[2932],一直延續(xù)到
東部的拉爾敦達(dá)坂晚石炭世(約312 Ma)[22,2934]以及備戰(zhàn)礦區(qū)(約301 Ma)[4,6,911,13],整體上表現(xiàn)為從西向東逐漸變年輕的趨勢(shì)?;鹕綆r具有高鉀鈣堿性地球化學(xué)特征,具有大陸弧巖漿的屬性[2534];朱永峰等通過SrNd同位素地球化學(xué)研究,提出西天山東部火山巖與西部火山巖具有不同的SrNd同位素組成,巖漿源區(qū)的時(shí)空變化規(guī)律顯示西天山早石炭世—晚石炭世構(gòu)造體制處于從俯沖向碰撞后環(huán)境的轉(zhuǎn)變[30],晚泥盆世—早石炭世則為大陸弧環(huán)境,從西向東逐漸消失,晚石炭世則為陸內(nèi)裂谷環(huán)境,伴隨有中酸性火山巖漿的噴發(fā)。
朱志新等總結(jié)了西天山古生代侵入巖的時(shí)空分布、地質(zhì)特征及地球化學(xué)特征,提出了西天山早古生代及其以前的侵入巖為一套與洋盆收斂俯沖有關(guān)的鈣堿性侵入巖;晚石炭世及其以后的古生代侵入巖為一套與同碰撞有關(guān)的富鋁花崗巖和后造山的富鉀花崗巖[22]。
本次獲得的鉀長(zhǎng)花崗巖成巖時(shí)代為(320.5±1.9)Ma,鉀長(zhǎng)花崗斑巖為(306.8±1.6)Ma,處于早石炭世末期—晚石炭世,兩者之間為脈動(dòng)侵入接觸。巖石地球化學(xué)研究結(jié)果顯示,巖石屬于高鉀鈣堿性系列,富集大離子親石元素Rb、K,虧損高場(chǎng)強(qiáng)元素,具有明顯的Ba、Sr、P、Ti負(fù)異常,這些特征與西天山石炭世火山巖的巖石地球化學(xué)特征相似,具有火山弧型巖漿巖的特點(diǎn)[22,25,2934]。在花崗巖類構(gòu)造環(huán)境w(Rb)w(Yb)+w(Ta)、w(Ta)w(Yb)、w(Rb)w(Yb)+w(Nb)判別圖[圖6(b)~(d)]中,其落在火山弧與同碰撞花崗巖界限附近,偏向于火山弧花崗巖;在w(Nb)w(Zr)、w(Rb)/10w(Hf)3w(Ta)、w(Rb)/30w(Hf)3w(Ta)判別圖[圖6(a)、(e)、(f)]中,其偏向于碰撞大地構(gòu)造背景花崗巖區(qū)域;結(jié)合區(qū)域火山巖研究成果,區(qū)內(nèi)鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖為同源巖漿活動(dòng)的產(chǎn)物,可能形成于早石炭世—晚石炭世期間的南天山洋俯沖結(jié)束向陸內(nèi)碰撞造山帶轉(zhuǎn)換過程中。區(qū)內(nèi)廣泛分布輝綠玢巖脈,鋯石UPb年齡為(304.0±1.2)Ma,穿插于鉀長(zhǎng)花崗斑巖、石炭紀(jì)的地層中,也暗示在晚石炭世—二疊世俯沖造山過程中有伸展拉張事件發(fā)生。
6結(jié)語(yǔ)
(1)新疆備戰(zhàn)鐵礦鉀長(zhǎng)花崗巖、鉀長(zhǎng)花崗斑巖在成分上屬于高鉀鈣堿性系列,富集大離子親石元素Rb、K,虧損高場(chǎng)強(qiáng)元素,具有明顯的Ba、Sr、P、Ti負(fù)異常,輕、重稀土元素分餾明顯,侵入時(shí)代分別為 (320.5±1.9)Ma和(306.8±1.6)Ma。
(2)巖石形成于早石炭世末期—晚石炭世期間的南天山洋俯沖結(jié)束向陸內(nèi)碰撞造山帶轉(zhuǎn)換過程中。
參考文獻(xiàn):
References:
[1]徐祖芳.新疆查鐵礦主礦體賦礦巖石的成巖探討[J].新疆地質(zhì),1984,2(2):3047.
XU Zufang.Petrogenetic Study of the Orebearing Rock from Main Body of the Cha Iron Ore,Xinjiang[J].Xinjiang Geology,1984,2(2):3047.
[2]王慶明,林卓斌,黃誠(chéng),等.西天山查崗諾爾地區(qū)礦床成礦系列和找礦方向[J].新疆地質(zhì),2001,19(4):263267.
WANG Qingming,LIN Zhuobin,HUANG Cheng,et al.Metallogenic Series and Prospecting Target of Ore Deposits at Chaganuur Region of the Western Tianshan[J].Xinjiang Geology,2001,19(4):263267.
[3]郭新成,張建收,余元軍,等.新疆和靜縣備戰(zhàn)鐵礦地質(zhì)特征及找礦標(biāo)志[J].新疆地質(zhì),2009,27(4):341345.
GUO Xincheng,ZHANG Jianshou,YU Yuanjun,et al.Geological Characteristics and Mining Symbols of Beizhan Iron Deposit in Hejing,Xinjiang[J].Xinjiang Geology,2009,27(4):341345.
[4]馮金星,石福品,汪幫耀,等.西天山阿吾拉勒成礦帶火山巖型鐵礦[M].北京:地質(zhì)出版社,2010.
FENG Jinxing,SHI Fupin,WANG Bangyao,et al.Volcanic Iron Deposit in Awulale Metallogenic Belt in Western Tianshan[M].Beijing:Geological Publishing House,2010.
[5]汪幫耀,胡秀軍,王江濤,等.西天山查崗諾爾鐵礦礦床地質(zhì)特征及礦床成因研究[J].礦床地質(zhì),2011,30(3):385402.
VAG-火山弧花崗巖;WPG-板內(nèi)花崗巖;synCOLG-同碰撞花崗巖;ORG-洋中脊花崗巖;圖(a)~(d)底圖引自文獻(xiàn)[35];
圖(e)和(f)底圖引自文獻(xiàn)[36]
圖6備戰(zhàn)鐵礦花崗巖類巖石構(gòu)造環(huán)境判別圖解
Fig.6Discrimination Diagrams of Tectonic Setting for Kfeldspar Granite and Kfeldspar Granite
Porphyry in Beizhan Iron Deposit
WANG Bangyao,HU Xiujun,WANG Jiangtao,et al.Geological Characteristics and Genesis of Chagannur Iron Deposit in Western Tianshan,Xinjiang[J].Mineral Deposits,2011,30(3):385402.
[6]ZHANG Z H,HONG W,JIANG Z S,et al.Geological Characteristics and Zircon UPb Dating of Volcanic Rocks from the Beizhan Iron Deposit in Western Tianshan Mountains,Xinjiang,NW China[J].Acta Geologica Sinica:English Edition,2012,86(3):737747.
[7]張作衡,洪為,蔣宗勝,等.新疆西天山晚古生代鐵礦床的地質(zhì)特征、礦化類型及形成環(huán)境[J].礦床地質(zhì),2012,31(5):941964.
ZHANG Zuoheng,HONG Wei,JIANG Zongsheng,et al.Geological Features,Mineralization Types and Metallogenic Setting of Late Paleozoic Iron Deposits in Western Tianshan Mountains of Xinjiang[J].Mineral Deposits,2012,31(5):941964.
[8]李鳳鳴,彭湘萍,石福品,等.西天山石炭紀(jì)火山沉積盆地鐵錳礦成礦規(guī)律淺析[J].新疆地質(zhì),2011,29(1):5560.
LI Fengming,PENG Xiangping,SHI Fupin,et al.Analysis of FeMn Mineralization Regularity in Carboniferous Volcanicsedimentary Basin of West Tianshan[J].Xinjiang Geology,2011,29(1):5560.
[9]洪為,張作衡,趙軍,等.新疆西天山查崗諾爾鐵礦床礦物學(xué)特征及其地質(zhì)意義[J].巖石礦物學(xué)雜志,2012,31(2):191211.
HONG Wei,ZHANG Zuoheng,ZHAO Jun,et al.Mineralogy of the Chagannur Iron Deposit in Western Tianshan Mountains,Xinjiang,and Its Geological Significance[J].Acta Petrologica et Mineralogica,2012,31(2):191211.
[10]蔣宗勝,張作衡,侯可軍,等.西天山查崗諾爾和智博鐵礦區(qū)火山巖地球化學(xué)特征、鋯石UPb年齡及地質(zhì)意義[J].巖石學(xué)報(bào),2012,28(7):20742088.
JIANG Zongsheng,ZHANG Zuoheng,HOU Kejun,et al.Geochemistry and Zircon UPb Age of Volcanic Rocks from the Chagangnuoer and Zhibo Iron Deposits,Western Tianshan,and Their Geological Significance[J].Acta Petrologica Sinica,2012,28(7):20742088.
[11] 阿米娜,弓小平,阿麗娜,等.西天山備戰(zhàn)鐵礦一帶大哈拉軍山組火山巖巖石地球化學(xué)特征與地質(zhì)意義[J].新疆地質(zhì),2013,31(2):129135.
A Mina,GONG Xiaoping,A Lina,et al.Petrogeochemical Characteristics and Its Geological Significance of Volcanic Rock in the Dahalajunshan Formation in the Beizhan Iron Deposit,Western Tianshan[J].Xinjiang Geology,2013,31(2):129135.
[12]宋相龍,弓小平,韓瓊,等.西天山松湖鐵礦與備戰(zhàn)鐵礦成礦特征對(duì)比研究[J].新疆地質(zhì),2013,31(4):306312.
SONG Xianglong,GONG Xiaoping,HAN Qiong,et al.Comparative Study on the Metallogenic Characteristics of Songhu Iron Ore and Beizhan Iron Ore in Western Tianshan[J].Xinjiang Geology,2013,31(4):306312.
[13]孫吉明,馬中平,徐學(xué)義,等.新疆西天山備戰(zhàn)鐵礦流紋巖的形成時(shí)代及其地質(zhì)意義[J].地質(zhì)通報(bào),2012,31(12):19731982.
SUN Jiming,MA Zhongping,XU Xueyi,et al.The Formation Epoch of the Host Wall Rock of the Beizhan Iron Deposit in West Tianshan Mountains of Xinjiang and Its Geological Significance[J].Geological Bulletin of China,2012,31(12):19731982.
[14]閆永紅,薛春紀(jì),張招崇,等.西天山阿吾拉勒西段群吉薩依花崗斑巖地球化學(xué)特征及其成因[J].巖石礦物學(xué)雜志,2013,32(2):139153.
YAN Yonghong,XUE Chunji,ZHANG Zhaochong,et al.Geochemistry and Genesis of the Qunjisayi Granite Porphyry in the West of Awulale Area,Western Tianshan Mountains[J].Acta Petrologica et Mineralogica,2013,32(2):139153.
[15]韓瓊,弓小平,毛磊,等.西天山備戰(zhàn)鐵礦成巖年代厘定及礦床成因研究[J].新疆地質(zhì),2013,31(2):136140.
HAN Qiong,GONG Xiaoping,MAO Lei,et al.Study on the Metallogenic Epoch and Mineral Genesis of Beizhan Iron Ore in Western Tianshan[J].Xinjiang Geology,2013,31(2):136140.
[16]GAO S,LIU X M,YUAN H L,et al.Determination of Forty Two Major and Trace Elements in USGS and NIST SRM Glasses by Laser Ablationinductively Coupled Plasmamass Spectrometry[J].Geostandards and Geoanalytical Research,2002,26(2):181196.
[17]NASDALA L,HOFMEISTER W,NORBERG N,et al.Zircon M257—A Homogeneous Natural Reference Material for the Ion Microprobe UPb Analysis of Zircon[J].Geostandards and Geoanalytical Reseach,2008,32(3):247265.
[18]LIU Y S,GAO S,HU Z C,et al.Continental and Oceanic Crust Recyclinginduced Meltperidotite Interactions in the TransNorth China Orogen:UPb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths[J].Journal of Petrology,2010,51(1/2):537571.
[19]侯可軍,李延河,田有榮.LAMCICPMS鋯石微區(qū)原位UPb定年技術(shù)[J].礦床地質(zhì),2009,28(4):481492.
HOU Kejun,LI Yanhe,TIAN Yourong.In Situ UPb Zircon Dating Using Laser Ablationmulti Ion CountingICPMS[J].Mineral Deposits,2009,28(4):481492.
[20]TAYLOR S R,MCCLENNAN S M.The Continental Crust:Its Composition and Evolution[M].Oxford:Blackwell Scientific Publications,1985.
[21]吳元保,鄭永飛.鋯石成因礦物學(xué)研究及其對(duì)UPb年齡解釋的制約[J].科學(xué)通報(bào),2004,49(16):15891604.
WU Yuanbao,ZHENG Yongfei.Genesis of Zircon and Its Constraints on Interpretation of UPb Age[J].Chinese Science Bulletin,2004,49(16):15891604.
[22]朱志新,李錦軼,董連慧,等.新疆西天山古生代侵入巖的地質(zhì)特征及構(gòu)造意義[J].地學(xué)前緣,2011,18(2):170179.
ZHU Zhixin,LI Jinyi,DONG Lianhui,et al.Geological Characteristics and Tectonic Significance of Paleozoic Intrusive Rocks in Western Tianshan of Xinjiang Province[J].Earth Science Frontiers,2011,18(2):170179.
[23]王作勛,鄔繼易,呂喜朝,等.天山多旋回構(gòu)造演化及成礦[M].北京:科學(xué)出版社,1990.
WANG Zuoxun,WU Jiyi,LU Xichao,et al.Polycyclic Tectonic Evolution and Metallogeny of Tianshan Mountains[M].Beijing:Science Press,1990.
[24]劉新,錢青,蘇文,等.西天山阿吾拉勒西段木汗巴斯陶侵入巖體的地球化學(xué)特征、時(shí)代及地質(zhì)意義[J].巖石學(xué)報(bào),2012,28(8):24012413.
LIU Xin,QIAN Qing,SU Wen,et al.Pluton from Muhanbasitao in the Western of Awulale,Western Tianshan:Geochemistry,Geochronology and Geological Implications[J].Acta Petrologica Sinica,2012,28(8):24012413.
[25]龍靈利,高俊,錢青,等.西天山伊犁地區(qū)石炭紀(jì)火山巖地球化學(xué)特征及構(gòu)造環(huán)境[J].巖石學(xué)報(bào),2008,24(4):699710.
LONG Lingli,GAO Jun,QIAN Qing,et al.Geochemica1 Characteristics and Tectonic Settings of Carboniferous Volcanic Rocks from Yili Region,Western Tianshan[J].Acta Petrologica Sinica,2008,24(4):699710.
[26]LONG L L,GAO J,KLEMD R,et al.Geochemical and Geochronological Studies of Granitoid Rocks fromthe Western Tianshan Orogen:Implications for Continental Growth in the Southwestern Central Asian Orogenic Belt[J].Lithos,2011,126(3/4):321340.
[27]HAN B F,GUO Z J,ZHANG Z C,et al.Age,Geochemistry,and Tectonic Implications of a Late Paleozoic Stitching Pluton in the North Tian Shan Suture Zone,Western China[J].GSA Bulletin,2010,122(3/4):627640.
[28]韓寶福,郭召杰,何國(guó)琦.“釘合巖體”與新疆北部主要縫合帶的形成時(shí)限[J].巖石學(xué)報(bào),2010,26(8):22332246.
HAN Baofu,GUO Zhaojie,HE Guoqi.Timing of Major Suture Zones in North Xinjiang,China:Constraints from Stitching Plutons[J].Acta Petrologica Sinica,2010,26(8):22332246.
[29]朱永峰,張立飛,古麗冰,等.西天山石炭紀(jì)火山巖SHRIMP年代學(xué)及其微量元素地球化學(xué)研究[J].科學(xué)通報(bào),2005,50(18):20042014.
ZHU Yongfeng,ZHANG Lifei,GU Libing,et al.The Zircon SHRIMP Chronology and Trace Elementgeochemistry of the Carboniferous Volcanic Rocks in Western Tianshan
Mountains[J].Chinese Science Bulletin,2005,50(18):20042014.
[30]朱永峰,周晶,郭璇.西天山石炭紀(jì)火山巖巖石學(xué)及SrNd同位素地球化學(xué)研究[J].巖石學(xué)報(bào),2006,22(5):13411350.
ZHU Yongfeng,ZHOU Jing,GUO Xuan.Petrology and SrNd Isotopic Geochemistry of the Carboniferous Volcanic Rocks in the Western Tianshan Mountains,NW China[J].Acta Petrologica Sinica,2006,22(5):13411350.
[31]茹艷嬌,徐學(xué)義,李智佩,等.西天山烏孫山地區(qū)大哈拉軍山組火山巖LAICPMS鋯石UPb年齡及其構(gòu)造環(huán)境[J].地質(zhì)通報(bào),2012,31(1):5062.
RU Yanjiao,XU Xueyi,LI Zhipei,et al.LAICPMS Zircon UPb Age and Tectonic Background of the Dahalajunshan Formation Volcanic Rocks in Wusunshan Area,West Tianshan Mountains[J].Geological Bulletin of China,2012,31(1):5062.
[32]錢青,高俊,熊賢明,等.西天山昭蘇北部石炭紀(jì)火山巖的巖石地球化學(xué)特征、成因及形成環(huán)境[J].巖石學(xué)報(bào),2006,22(5):13071322.
QIAN Qing,GAO Jun,XIONG Xianming,et al.Petrogenesis and Tectonic Settings of Carboniferous Volcanic Rocks from North Zhaosu,Western Tianshan Mountains:Constraints from Petrology and Geochemistry[J].Acta Petrologica Sinica,2006,22(5):13071322.
[33]李大鵬,杜楊松,龐振山,等.西天山阿吾拉勒石炭紀(jì)火山巖年代學(xué)和地球化學(xué)研究[J].地球?qū)W報(bào),2013,34(2):176192.
LI Dapeng,DU Yangsong,PANG Zhenshan,et al.Zircon UPb Chronology and Geochemistry of Carboniferous Volcanic Rocks in Awulale Area,Western Tianshan Mountains[J].Acta Geoscientica Sinica,2013,34(2):176192.
[34]孫林華,彭頭平,王岳軍.新疆特克斯東南大哈拉軍山組玄武安山巖地球化學(xué)特征:巖石成因和構(gòu)造背景探討[J].大地構(gòu)造與成礦學(xué),2007,31(3):372379.
SUN Linhua,PENG Touping,WANG Yuejun.Geochemical Characteristics of Basaltic Andesites from Dahalajunshan Formation,Southeastern Tekesi(Xinjiang):Petrogenesis and Its Tectonic Significance[J].Geotectonica et Metallogenia,2007,31(3):372379.
[35]PEARCE J A,HARRIS N B W,TINDLE A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J].Journal of Petrology,1984,25(4):956983.
[36]HARRIS N B W,PEARCE J A,TINDLE A G.Geochemical Characteristics of Collisionzone Magmatism[J].Geological Society,London,Special Publications,1986,19:6781.
HAN Baofu,GUO Zhaojie,HE Guoqi.Timing of Major Suture Zones in North Xinjiang,China:Constraints from Stitching Plutons[J].Acta Petrologica Sinica,2010,26(8):22332246.
[29]朱永峰,張立飛,古麗冰,等.西天山石炭紀(jì)火山巖SHRIMP年代學(xué)及其微量元素地球化學(xué)研究[J].科學(xué)通報(bào),2005,50(18):20042014.
ZHU Yongfeng,ZHANG Lifei,GU Libing,et al.The Zircon SHRIMP Chronology and Trace Elementgeochemistry of the Carboniferous Volcanic Rocks in Western Tianshan
Mountains[J].Chinese Science Bulletin,2005,50(18):20042014.
[30]朱永峰,周晶,郭璇.西天山石炭紀(jì)火山巖巖石學(xué)及SrNd同位素地球化學(xué)研究[J].巖石學(xué)報(bào),2006,22(5):13411350.
ZHU Yongfeng,ZHOU Jing,GUO Xuan.Petrology and SrNd Isotopic Geochemistry of the Carboniferous Volcanic Rocks in the Western Tianshan Mountains,NW China[J].Acta Petrologica Sinica,2006,22(5):13411350.
[31]茹艷嬌,徐學(xué)義,李智佩,等.西天山烏孫山地區(qū)大哈拉軍山組火山巖LAICPMS鋯石UPb年齡及其構(gòu)造環(huán)境[J].地質(zhì)通報(bào),2012,31(1):5062.
RU Yanjiao,XU Xueyi,LI Zhipei,et al.LAICPMS Zircon UPb Age and Tectonic Background of the Dahalajunshan Formation Volcanic Rocks in Wusunshan Area,West Tianshan Mountains[J].Geological Bulletin of China,2012,31(1):5062.
[32]錢青,高俊,熊賢明,等.西天山昭蘇北部石炭紀(jì)火山巖的巖石地球化學(xué)特征、成因及形成環(huán)境[J].巖石學(xué)報(bào),2006,22(5):13071322.
QIAN Qing,GAO Jun,XIONG Xianming,et al.Petrogenesis and Tectonic Settings of Carboniferous Volcanic Rocks from North Zhaosu,Western Tianshan Mountains:Constraints from Petrology and Geochemistry[J].Acta Petrologica Sinica,2006,22(5):13071322.
[33]李大鵬,杜楊松,龐振山,等.西天山阿吾拉勒石炭紀(jì)火山巖年代學(xué)和地球化學(xué)研究[J].地球?qū)W報(bào),2013,34(2):176192.
LI Dapeng,DU Yangsong,PANG Zhenshan,et al.Zircon UPb Chronology and Geochemistry of Carboniferous Volcanic Rocks in Awulale Area,Western Tianshan Mountains[J].Acta Geoscientica Sinica,2013,34(2):176192.
[34]孫林華,彭頭平,王岳軍.新疆特克斯東南大哈拉軍山組玄武安山巖地球化學(xué)特征:巖石成因和構(gòu)造背景探討[J].大地構(gòu)造與成礦學(xué),2007,31(3):372379.
SUN Linhua,PENG Touping,WANG Yuejun.Geochemical Characteristics of Basaltic Andesites from Dahalajunshan Formation,Southeastern Tekesi(Xinjiang):Petrogenesis and Its Tectonic Significance[J].Geotectonica et Metallogenia,2007,31(3):372379.
[35]PEARCE J A,HARRIS N B W,TINDLE A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J].Journal of Petrology,1984,25(4):956983.
[36]HARRIS N B W,PEARCE J A,TINDLE A G.Geochemical Characteristics of Collisionzone Magmatism[J].Geological Society,London,Special Publications,1986,19:6781.
HAN Baofu,GUO Zhaojie,HE Guoqi.Timing of Major Suture Zones in North Xinjiang,China:Constraints from Stitching Plutons[J].Acta Petrologica Sinica,2010,26(8):22332246.
[29]朱永峰,張立飛,古麗冰,等.西天山石炭紀(jì)火山巖SHRIMP年代學(xué)及其微量元素地球化學(xué)研究[J].科學(xué)通報(bào),2005,50(18):20042014.
ZHU Yongfeng,ZHANG Lifei,GU Libing,et al.The Zircon SHRIMP Chronology and Trace Elementgeochemistry of the Carboniferous Volcanic Rocks in Western Tianshan
Mountains[J].Chinese Science Bulletin,2005,50(18):20042014.
[30]朱永峰,周晶,郭璇.西天山石炭紀(jì)火山巖巖石學(xué)及SrNd同位素地球化學(xué)研究[J].巖石學(xué)報(bào),2006,22(5):13411350.
ZHU Yongfeng,ZHOU Jing,GUO Xuan.Petrology and SrNd Isotopic Geochemistry of the Carboniferous Volcanic Rocks in the Western Tianshan Mountains,NW China[J].Acta Petrologica Sinica,2006,22(5):13411350.
[31]茹艷嬌,徐學(xué)義,李智佩,等.西天山烏孫山地區(qū)大哈拉軍山組火山巖LAICPMS鋯石UPb年齡及其構(gòu)造環(huán)境[J].地質(zhì)通報(bào),2012,31(1):5062.
RU Yanjiao,XU Xueyi,LI Zhipei,et al.LAICPMS Zircon UPb Age and Tectonic Background of the Dahalajunshan Formation Volcanic Rocks in Wusunshan Area,West Tianshan Mountains[J].Geological Bulletin of China,2012,31(1):5062.
[32]錢青,高俊,熊賢明,等.西天山昭蘇北部石炭紀(jì)火山巖的巖石地球化學(xué)特征、成因及形成環(huán)境[J].巖石學(xué)報(bào),2006,22(5):13071322.
QIAN Qing,GAO Jun,XIONG Xianming,et al.Petrogenesis and Tectonic Settings of Carboniferous Volcanic Rocks from North Zhaosu,Western Tianshan Mountains:Constraints from Petrology and Geochemistry[J].Acta Petrologica Sinica,2006,22(5):13071322.
[33]李大鵬,杜楊松,龐振山,等.西天山阿吾拉勒石炭紀(jì)火山巖年代學(xué)和地球化學(xué)研究[J].地球?qū)W報(bào),2013,34(2):176192.
LI Dapeng,DU Yangsong,PANG Zhenshan,et al.Zircon UPb Chronology and Geochemistry of Carboniferous Volcanic Rocks in Awulale Area,Western Tianshan Mountains[J].Acta Geoscientica Sinica,2013,34(2):176192.
[34]孫林華,彭頭平,王岳軍.新疆特克斯東南大哈拉軍山組玄武安山巖地球化學(xué)特征:巖石成因和構(gòu)造背景探討[J].大地構(gòu)造與成礦學(xué),2007,31(3):372379.
SUN Linhua,PENG Touping,WANG Yuejun.Geochemical Characteristics of Basaltic Andesites from Dahalajunshan Formation,Southeastern Tekesi(Xinjiang):Petrogenesis and Its Tectonic Significance[J].Geotectonica et Metallogenia,2007,31(3):372379.
[35]PEARCE J A,HARRIS N B W,TINDLE A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J].Journal of Petrology,1984,25(4):956983.
[36]HARRIS N B W,PEARCE J A,TINDLE A G.Geochemical Characteristics of Collisionzone Magmatism[J].Geological Society,London,Special Publications,1986,19:6781.