班—怒成矿带西段躬穷左波Fe-Cu矿区侵入岩年代学及地球化学特征
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引用本文:旦真王修,王立强,王勇,李志军,李申,李壮.2017.班—怒成矿带西段躬穷左波Fe-Cu矿区侵入岩年代学及地球化学特征[J].地球学报,38(5):734-744.
DOI:10.3975/cagsb.2017.05.13
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作者单位E-mail
旦真王修 中国地质大学(北京)地球科学与资源学院 dzwx@cugb.edu.cn 
王立强 中国地质科学院矿产资源研究所 wlq060301@163.com 
王勇 中国地质大学(北京)地球科学与资源学院  
李志军 成都理工大学地球科学学院  
李申 成都理工大学地球科学学院  
李壮 中国地质科学院矿产资源研究所  
基金项目:中国地质调查局地质调查项目(编号: DD20160026);国家自然科学基金项目(编号: 41403040)
中文摘要:本文对躬穷左波Fe-Cu矿区出露的三套酸性侵入岩进行了系统的LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究。年代学测试结果显示花岗斑岩、二长花岗斑岩和钾长花岗岩206Pb/238U加权平均年龄分别为147.0 Ma、143.6 Ma和142.8 Ma, 矿区存在晚侏罗世—早白垩世存在3期岩浆事件。岩石地球化学组成特征显示, 花岗斑岩属准铝质-弱过铝质I型花岗岩; 二长花岗斑岩为高钾钙碱性系列, 属弱过铝质I型花岗岩; 钾长花岗岩经历了强烈的结晶分异作用, 属高分异I型花岗岩。岩石微量元素富集Rb、Th、U、Pb而亏损Nb、Ta、Ti、P元素, Nb/Ta比值接近大陆地壳组成及锆石负的εHf(t)值特征, 指示成岩物质以壳源物质为主。躬穷左波晚侏罗世矽卡岩型Fe-Cu矿化事件的发现对于完善班—怒带西段成矿规律和指导区域找矿工作具有重要意义。
中文关键词:锆石U-Pb年代学  岩石地球化学  躬穷左波  班公湖—怒江成矿带
 
Geochronology and Geochemistry of Main Intrusions of the Gongqiongzuobo Fe-Cu Ore Occurrence in the Western Bangong Co–Nujiang Metallogenic Belt, Tibet and Its Geological Significance
Abstract:This paper reports systematic research about LA-ICP-MS zircon U-Pb age, whole-rock major and trace element of three acid intrusives from the Gongqiongzuobo Fe-Cu deposit. The result of Geochronology testing shows that the weighted average age are 147.0 Ma(Granite porphyry), 143.6 Ma(Monzonitic granite porphyry) and 142.8 Ma(K-feldspar granite) respectively and finds there are three periods of magma activity in Gongqiongzuobo area during late jurassic-early cretaceous epoch. The result of geochemistry characteristics shows that (1)Granite porphyry belongs to aluminum-weakly peraluminous I-type granite, (2)Monzonitic granite porphyry is high potassium calc-alkine series and belongs to weakly peraluminous I-type granite, (3)K-feldspar granite has experienced strong crystallization differentiation and belongs to high differentiation I-type granite. Those rocks enrich in Rb Th U Pb and deplete in Nb Ta Ti P, their Nb/Ta ratio are close to continental crust and the zircon has negative εHf(t) value. All these feature implys rock-forming materials are mainly come from the crust-source. The discoveray of late-jurassic skarn-type mineralization has important significance for consummating regional metallogeny and directing regional prospecting.
keywords:zircon U-Pb dating  whole-rock geochemistry  Gongqiongzuobo  Bangong Co–Nujiang metallogenic belt
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