西天山加满特铅银矿含矿围岩地球化学特征及构造背景分析
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摘要
加满特铅银矿位于西天山伊什基里克成矿带,矿体主要赋存于下二叠统乌朗组火山岩中。通过对加满特铅银矿区含矿围岩进行岩石地球化学和LA-ICPMS锆石U-Pb测年分析,探讨火山岩形成构造环境与成岩时代。地球化学分析表明,加满特铅银矿含矿围岩为钾质玄武岩系列与钙碱性系列。微量元素和稀土元素表明,矿区火山岩产出构造环境为碰撞后板内伸展期裂谷环境。通过对含矿围岩进行锆石U-Pb测年,获得~(206)Pb/~(238)U加权平均年龄为(294.59±0.92)Ma,属早二叠世。
The Ga mante lead silver deposit is located in the Ishkirk metallogenic belt in the western Tianshan Mountains. The orebody mainly occurred in the lower Permian Wulang formation(P1w). In this paper, the tectonic environment and diagenetic age of volcanic rocks are discussed by geochemistry and LA-ICPMS zircon U-Pb dating analysis of the ore-bearing surrounding rock in the lead and silver ore area of Ga mante. Chemical analysis shows that the surrounding rock of the lead and silver ore deposit is of the series of potash basalt and calc-alkaline. The trace elements and rare earth elements indicate that the tectonic environment of volcanic rocks in the ore area is in the rift environment of intraplate extension after collision. Zircon U-Pb dating of ore-bearing surrounding rock is carried out. The weighted average age of ~(206)Pb/~(238)U is(294.59 ±0.92)Ma. it belongs to the early Permian.
The Ga mante lead silver deposit is located in the Ishkirk metallogenic belt in the western Tianshan Mountains. The orebody mainly occurred in the lower Permian Wulang formation(P1w). In this paper, the tectonic environment and diagenetic age of volcanic rocks are discussed by geochemistry and LA-ICPMS zircon U-Pb dating analysis of the ore-bearing surrounding rock in the lead and silver ore area of Ga mante. Chemical analysis shows that the surrounding rock of the lead and silver ore deposit is of the series of potash basalt and calc-alkaline. The trace elements and rare earth elements indicate that the tectonic environment of volcanic rocks in the ore area is in the rift environment of intraplate extension after collision. Zircon U-Pb dating of ore-bearing surrounding rock is carried out. The weighted average age of ~(206)Pb/~(238)U is(294.59 ±0.92)Ma. it belongs to the early Permian.
引文
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[14]宋志瑞,肖晓林,罗春林,等.新疆伊宁盆地尼勒克地区二叠纪地层研究新进展[J].新疆地质,2005,24(4):334-338
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[22]赵军,张作衡,张贺,等.新疆阿吾拉勒山西段下二叠统陆相火山岩岩石地球化学特征、成因及构造背景[J].地质学报,2013,87(4):525-541.
[23]Boynton W V.Geochemistry of the rare earth elements:Meteostudies[C].Henderson P.Rare Earth Element Geochemis Amsterdam:Elsevier,1984:63-114.
[24]Hoskin P W O,Schaltegger U,The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in Mineralogy and Geochemistry,2003,53(1):27-62.
[25]王焰,钱青,刘良,张旗.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000,16(2):169-173.
[26]尹得功,弓小平,韩琼,等.新疆新源县巴音居里克一带下—中二叠统乌郎组火山岩特征及地质意义[J].西北地质,2015,48(1):16-25.
[2]潘明臣,于海峰,王福君,等.新疆博乐地区下二叠统乌郎组火山岩特征与构造环境分析[J].地质与资源,2011,20(3):226-230.
[3]朱志新,董连慧,刘淑聪,等.新疆西天山伊犁地块晚古生代火山岩地质特征及构造意义[J].新疆地质.2012.
[4]ZHOU DW,LIU YQ,XIN XJ,et al.Tracing and reconstruction of the Palaeo tectonic background of the Permian basalts in Tuha and Santanghu Basins,NW China[J].Science in China(Series D).2006,26:143-153.
[5]王式洸,韩宝福,洪大卫,等.新疆乌伦古河碱性花岗岩的地球化学及其构造意义[J].地质科学,1994,(4):373-383.
[6]夏祖春,徐学义,夏林圻,等.天山石炭-二叠纪后碰撞花岗质岩石地球化学研究[J].西北地质,2005,38(1):1-14.
[7]ZHOU MF,LESHER CM,YANG ZX,et al.Geochemisrty and petrogenesis of 207Ma Ni-Cu(PGE)sulfide-bearing mafic intrusions in the Huangshang district,Eastern Xinjiang,Northwest China:Implications for the tectonic evolution of the Central Asian orogenic belt[J].Chemical Geology.2004,209(3-4):133-257.
[8]ZHANG CL,LI XH,LI ZX,et al.A Permian layered intrusive complexmin the western Tarim Block,northwestern China:Product of a ca.275Ma mantle plume[J].Journal of Geology.2008,116(3):269-287.
[9]BORISENKO AS,SOTNIKOV VI,IZOKH AE,et al.Permo-Triassic mineralization in Asia and its relation to plume magmatism[J].Russian Geology and Geophysics.2006,47:166-182.
[10]新疆维吾尔自治区地质矿产局.新疆成矿单元划分及其成矿基本特征[M].北京:地质出版社,2012.
[11]新疆维吾尔自治区地质矿产局.新疆板块构造区划分图[M].北京:地质出版社,2010.
[12]高俊,何国琦,李茂松.西天山造山带的古生代造山过程[J].地球科学-中国地质大学学报,1997,22(1):27-32.
[13]徐晟,熊荣辉,刘良文.新疆巩留县喀拉台奇铅银矿成矿地质特征及成因模式分析[J].新疆有色金属,2014,3:57-61.
[14]宋志瑞,肖晓林,罗春林,等.新疆伊宁盆地尼勒克地区二叠纪地层研究新进展[J].新疆地质,2005,24(4):334-338
[15]尹得功,弓小平,韩琼,等.新疆新源县巴音居里克一带下—中二叠统乌郎组火山岩特征及地质意义[J].西北地质,2015,48(1):16-25.
[16]邱家骧,林景仟.岩石化学[M].北京:地质出版社,1991.
[17]韩吟文,马振东,等.地球化学[M].北京:地质出版社,2004.
[18]Pearce,J.A.,N.B.W.,Tindle,A.G.,Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Petrol.,1984,25(4):956-983.
[19]赵振华.微量元素地球化学原理[M].北京:科学出版社,1997.
[20]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992.
[21]刘静,李永军,王小刚,等.西天山阿吾拉勒一带伊什基里克组火山岩地球化学特征及构造环境[J].新疆地质,2006,24(2):105-108.
[22]赵军,张作衡,张贺,等.新疆阿吾拉勒山西段下二叠统陆相火山岩岩石地球化学特征、成因及构造背景[J].地质学报,2013,87(4):525-541.
[23]Boynton W V.Geochemistry of the rare earth elements:Meteostudies[C].Henderson P.Rare Earth Element Geochemis Amsterdam:Elsevier,1984:63-114.
[24]Hoskin P W O,Schaltegger U,The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in Mineralogy and Geochemistry,2003,53(1):27-62.
[25]王焰,钱青,刘良,张旗.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000,16(2):169-173.
[26]尹得功,弓小平,韩琼,等.新疆新源县巴音居里克一带下—中二叠统乌郎组火山岩特征及地质意义[J].西北地质,2015,48(1):16-25.