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文章摘要
侯淋,唐菊兴,林彬,宋扬,王勤,李玉彬,冯军,李彦波,陈列,唐晓倩.西藏东窝东矿床矿化蚀变过程元素迁移及绢云母40Ar-39Ar年代学及其地质意义[J].岩矿测试,2017,36(4):440-449
HOU Lin,TANG Ju-xing,LIN Bin,SONG Yang,WANG Qin,LI Yu-bin,FENG Jun,LI Yan-bo,CHEN Lie,TANG Xiao-qian.Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance[J].Rock and Mineral Analysis,2017,36(4):440-449.DOI:10.15898/j.cnki.11-2131/td.201612050179
西藏东窝东矿床矿化蚀变过程元素迁移及绢云母40Ar-39Ar年代学及其地质意义
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Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance
投稿时间:2016-12-05  修订日期:2017-07-20
DOI:10.15898/j.cnki.11-2131/td.201612050179
中文关键词: 绢云母  40Ar-39Ar年代学  元素迁移  东窝东矿床  西藏
英文关键词: sericite  40Ar-39Ar isotopic dating  element migration  Dongwodong deposit  Tibet
基金项目:国家公益性行业科研专项"斑岩-浅成低温热液成矿系统研究及勘查评价示范——以西藏多龙整装勘查区为例"(201511017)
作者单位E-mail
侯淋 中国地质大学(北京)地球科学与资源学院, 北京 100083  
唐菊兴 中国地质科学院矿产资源研究所, 北京 100037  
林彬 中国地质科学院矿产资源研究所, 北京 100037  
宋扬 中国地质科学院矿产资源研究所, 北京 100037 songyang100@126.com 
王勤 成都理工大学, 四川 成都 610059  
李玉彬 西藏自治区地质调查院, 西藏 拉萨 850012  
冯军 西藏金龙矿业股份有限公司, 西藏 拉萨 850000  
李彦波 西藏地质矿产勘查开发局第五地质大队, 青海 格尔木 816000  
陈列 西藏地质矿产勘查开发局第五地质大队, 青海 格尔木 816000  
唐晓倩 北京中矿联咨询中心, 北京 100044  
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中文摘要:
      东窝东铜多金属矿床位于羌塘地体南缘,多龙铜金矿集区东侧。该矿床尚未开展矿化蚀变时限、成矿作用中元素迁移特征等问题的研究。为确定矿床的蚀变矿化作用时限,本文对东窝东矿床的黄铁绢英岩化蚀变带中的蚀变绢云母进行了40Ar-39Ar年代学测试,获得40Ar-39Ar坪年龄为122.20±0.84 Ma,该年龄与已有的斑岩体侵位时代(122 Ma)一致,说明东窝东矿床黄铁绢英岩化蚀变与斑岩体侵位有密切联系。此外,对比分析地表弱蚀变和钻孔中强黄铁绢英岩化花岗闪长斑岩的岩石地球化学结果,运用"等浓度线(isocon)方程"及其推导方程,探讨黄铁绢英岩化蚀变过程中的不同元素的带入、带出特点及元素迁移特征。结果表明:高场强元素质量基本守恒;轻稀土元素较重稀土元素迁移量较大,但总体上稀土元素的迁移程度较弱;主要的成矿元素Cu、Pb、Zn为带入元素。东窝东矿床含矿斑岩侵位时代和热液蚀变时限均与多龙矿集区内多不杂、波龙、铁格隆南等多个超大型-大型铜金矿床一致,说明东窝东矿床和多龙矿集区内的多个矿床受控于同一构造-岩浆成矿背景,东窝东矿区具有重要的找矿潜力。
英文摘要:
      The Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, east of the Duolong copper gold ore cluster. The study on the timing of alteration and element migration during the alteration has not yet been conducted. To determine the time of alteration, 40Ar-39Ar isotopic dating was carried out for altered sericites closely related to beresitizate mineralization. The results show that the plateau age is 122.20±0.84 Ma, which is consistent with the age (122 Ma) of ore-bearing porphyry. Thus, there is a close link between the mineralization and granodiorite porphyry. Meanwhile, the geochemical results of weakly-altered and mineralized granodiorite were compared, using the isocon equation and the derivation equation to judge the inclusion or extraction of each element and the element migration during the alteration. Results show that HFSEs are very immobile during the alteration, whereas REEs migrate insignificantly with more obvious migration of LREEs than HREEs. The ore-forming elements (Cu, Pb, Zn) are inclusion elements. The intrusive age of ore-bearing phophyries and the timing of hydrothermal alteration of Dongwodong deposit are consistent with those of other large-superlarge scale copper-gold deposits (Duobuza, Bolong, Tegelongnan) in Duolong copper gold ore cluster, indicating that they were controlled by the same tectonic-magmatic event and thus a great potential of ore-prospecting in Dongwodong mining district can be predicted.
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