金鸿山铜钼矿床赋矿岩体锆石LA-ICP-MS U-Pb年龄及意义

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英文篇名：Zircon LA-ICP-MS U-Pb age of Jinhongshan porphyry associated with Cu-Mo mineralization and its geological implication 作者：刘军 ; 袁海潮 ; 郭文波 ; 刘敏 ; 黄波 ; 李大吉 ; 石明科 英文作者：LIU Jun;YUAN Haichao;GUO Wenbo;LIU Min;HUANG Bo;LI Daji;SHI Mingke;Xi'an Northwest Nonferrous Geophysical-Geochemical Corps Ltd.;Geophysical Nonferrous Metals and Geochemical Survey,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou; 关键词：阿尔金走滑断裂 ; 铜钼矿床 ; 锆石年龄 ; 成矿时代 英文关键词：Altun strike-slip zone;;Zircon LA-ICP-MS U-Pb age;;Jinghongshan Cu-Mo deposit;;mineralogenetic epoch 中文刊名：YSKU 英文刊名：Nonferrous Metals(Mining Section) 机构：西安西北有色物化探总队有限公司;贵州有色金属和核工业地质勘查局物化探总队; 出版日期：2019-02-25 出版单位：有色金属(矿山部分) 年：2019 期：v.71 基金：青海省茫崖镇大通沟南山地区矿产远景调查项目(1212011140094) 语种：中文; 页：YSKU201902009 页数：5 CN：02 ISSN：11-1839/TF 分类号：43-47

摘要

金鸿山铜钼矿床位于秦祁昆中央造山系的阿尔金构造带(Ⅱ)和柴达木—西秦岭微地块,柴达木地块与阿尔金构造带交界处,矿化主要产于石英闪长岩中。本文分析了赋矿岩体中锆石U-Pb年龄,赋矿岩体锆石Th/U比值为0.22～0.70,平均0.57,阴极发光(CL)具良好韵律环带,显示了岩浆锆石特征;赋矿岩体LA-ICP-MS U-Pb年龄为(475.1±2.3)Ma,属中奥陶世,据岩体中锆石U-Pb年龄,结合区内构造演化,我们认为含矿岩体岩浆活动与板块俯冲—碰撞的构造作用诱发的阿尔金走滑断裂活动有关。
        Jinhongshan copper molybdenum beds is located in Qinling-Qilian-Kunlun central mountains of the altun tectonic belt(Ⅱ)and qaidam-west Qinling Micro plot,at the junction of Qaidam block and Altum tectonic belt,mineralization mainly occurs in quartz diorite.In this paper,the U-Pb age of zircon in ore-bearing rocks was analyzed.The Th/U ratio of ore body zircons was between 0.22～0.70.Cathode Luminescence(CL)had a good rhythm band,showing the characteristics of magmatic zircons.The age of LA-ICP-MS U-Pb was(475.4±2.3)Ma,belonging to middle ordovician.According to the U-Pb age of zircon in the rock mass,the tectonic evolution in the binding zone,it can believe that the magmatic activity of ore-bearing rock mass is related to the Altum strike-slip fault induced by the tectonic action of subduction-collision.

引文

[1]伍跃中,王战,过磊,等.阿尔金山西南段花岗岩类的时空变化与构造作用-来自钾钠含量变化的证据[J].大地构造与成矿学,2009,33(4):572-587.
    [2]王登红,应汉龙,梁华英,等.西南三江地区新生代大陆动力学过程与大规模成矿[M].北京:地质出版社,2005:1-208.
    [3]黄波,梁华英,莫济海,等.金平铜厂铜钼矿床赋矿岩体锆石LA-ICP-MS U-Pb年龄及意义[J].大地构造与成矿学,2009,33(4):598-602.
    [4]梁华英,谢应雯,张玉泉,等.富钾碱性岩体形成演化对铜矿床制约—马厂箐铜矿为例[J].自然科学进展,2004,14(1):118-122.
    [5]莫济海,梁华英,喻亨祥,等.冈底斯斑岩铜矿带冲江及红驱龙含矿斑岩体锆石ELA-ICP-MS及SHRIMP定年对比研究[J].大地构造与成矿学,2006,30(4):504-509.
    [6]陆世才,李峰,刀艳.云南九顶山斑岩铜钼矿流体包裹体特征及地质意义[J].有色金属工程,2016,6(6):92-95.
    [7] LEE J K W,WILLIAMS I S,ELLIS D J.Pb,U and Th diffusion in nature zircon[J].Nature,1997,390:159-162.
    [8] CHERIAK D J,WATSON E B.Pb diffusion in zircon[J].Chemical Geology,2001,172:5-24.
    [9]BALLARD J R,PALIN J M,WILLIAMS I S,et al.Two age of porphyry intrusion resolved for the super-giant Chuqicamata copper deposit of northern Chile by ELA-ICP-MS and SHRIMP[J].Geology,2001,29(5):383-386.
    [10]COMPSTON W,WILLAMS I S、MEYER C.U-Pb gechronology of zircons from lunar breccias 73217 using a sensitive high massresolution ion microprobe[J].Journal of Geophysical Research,1984,89(supplement):525-534.
    [11]RUBATTO D,GEBAUER D.Using of Cathorodoluminescence for U-Pb zircon dating by ion microprobe:Some examples from the western Alps,In:PAGEL M,BARBIN V,BLANC P and OHNENSTETTER D(eds)[J]. Cathorodoluminescence in Geosciences.Berlin:Springer,2000:373-400.
    [12]LELOUP P H,LACASSIN R,TAPPONNIER U,et al.The AilaoShan-Red River shear zone(Yunnan,China):Tertiary transform boundary of Indochina[J].Tectonophysics,1995,251(1/4):3-10.
    [13]王永和,校培喜,孙南一,等.苏吾什杰幅由区域地质调查新成果及主要进展[J].地质通报,2003,23(5/6):560-563.
    [14]任收麦,葛肖虹,刘永江,等.阿尔金断裂带研究进展[J].地球科学进展,2003,18(3):386-390.