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黑龙江三矿沟铁铜矿床花岗闪长岩锆石U-Pb定年、岩石成因及构造意义
引用本文:褚少雄,刘建明,徐九华,魏浩,柴辉,佟匡胤.黑龙江三矿沟铁铜矿床花岗闪长岩锆石U-Pb定年、岩石成因及构造意义[J].岩石学报,2012,28(2):433-450.
作者姓名:褚少雄  刘建明  徐九华  魏浩  柴辉  佟匡胤
作者单位:1. 中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029
2. 北京科技大学资源工程系,北京,100083
3. 中国地质大学地球科学与资源学院,北京,100083
4. 黑龙江黑龙矿业集团股份有限公司,哈尔滨,150090
基金项目:本文受全国危机矿山接替资源综合研究项目(20089931)、中国科学院战略性先导科技专项项目(XDA08100500)和自然科学基金项目(40972065)联合资助.
摘    要:黑龙江三矿沟Fe-Cu矿床是中亚造山带东段大兴安岭北部裸河-多宝山-三矿沟NW向成矿带中矽卡岩型矿床的典型代表。LA-ICP-MS锆石U-Pb年代学表明,与成矿密切相关的黑云母花岗闪长岩的锆石谐和年龄和238U/206Pb加权平均年岭分别为175.9±1.6Ma和175.9±1.1Ma,二者在误差范围内具有良好的一致性,表明多宝山成矿区在早侏罗世晚期存在一期重要的岩浆-热液成矿事件。三矿沟花岗闪长岩的元素地球化学特征具有岛弧岩浆岩的地球化学亲缘性:岩石富钠(Na2O/K2O=1.39~1.59),准铝质(A/CNK=0.87~0.91),富集轻稀土元素(LREE),(La/Yb)N=8.02~10.45,Eu显示弱负异常(δEu=0.82~0.98),富集大离子亲石元素(LILE,如Rb、Ba、K)和元素地球化学性质活泼的不相容元素(U、Th、Pb),相对亏损高场强元素(HFSE,如Nb、Ta、Zr、Hf、Ti)。Sr-Nd-Pb同位素分析结果表明:三矿沟花岗闪长岩具有低的Sr同位素初始比值((87Sr/86Sr)i=0.7041~0.7045)、高的Nd同位素初始比值((143Nd/144Nd)i=0.512556~0.512576)、正的εNd(t)值(2.8~3.9)、年轻的二阶段亏损地幔模式年龄(tDM2=647~733Ma)和幔源铅同位素组成特征((206Pb/204Pb)t=18.121~18.418;(207Pb/204Pb)t=15.480~15.511;(208Pb/204Pb)t=37.628~37.713),上述同位素地球化学特征均显示花岗闪长质岩浆主要源于亏损地幔源区。结合东北地区区域构造演化和岩体微量元素及同位素组成特征反映该矿床形成于岛弧的构造背景,其形成可能与侏罗纪古太平洋板块的俯冲作用密切相关。

关 键 词:LA-ICP-MS锆石U-Pb定年  Sr-Nd-Pb同位素  岩石地球化学  成矿动力学环境  三矿沟花岗闪长岩  矽卡岩型Fe-Cu矿床
收稿时间:2011/8/22 0:00:00
修稿时间:2011/10/29 0:00:00

Zircon U-Pb dating, petrogenesis and tectonic significance of the granodiorite in the Sankuanggou skarn Fe-Cu deposit, Heilongjiang Province
CHU ShaoXiong,LIU JianMing,XU JiuHu,WEI Hao,CHAI Hui and TONG KuangYin.Zircon U-Pb dating, petrogenesis and tectonic significance of the granodiorite in the Sankuanggou skarn Fe-Cu deposit, Heilongjiang Province[J].Acta Petrologica Sinica,2012,28(2):433-450.
Authors:CHU ShaoXiong  LIU JianMing  XU JiuHu  WEI Hao  CHAI Hui and TONG KuangYin
Institution:Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, CAS, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, CAS, Beijing 100029, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;Resource Engineering Department, University of Science and Technology Beijing, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Heilongjiang Heilong Mining Group Co., Ltd, Harbin 150090, China
Abstract:The Sankuanggou Fe-Cu deposit,located in northern Heilongjiang Province,is a typical skarn deposit which occurs in the NW trending Luohe-Duobaoshan-Sankuanggou metallogenic belt of northern part of the Da Hinggan Range.The ore-related Sankuanggou granodiorite yields a concordia LA-ICP-MS zircon U-Pb age of 175.9±1.6Ma in good consistently with 238U/206Pb weighted average age within error.This age indicates that there was an important Jurassic magmatic-hydrothermal Fe-Cu mineralization event in the Duobaoshan metallogenic district.The Sankuanggou granodiorite has a geochemical affinity of arc magmas:Na-rich(Na2O/K2O=1.39~1.59) ,metaluminous(ACNK=0.87~0.91) ,enrichment in LREE((La/Yb) N=8.02~10.45) and LILEs(U,Th and Pb) with minor negative Eu anomalies(δEu=0.82~0.98) ,depletion in HFSE(Nb,Ta,Zr,Hf and Ti) .Sr-Nd-Pb isotope systematics display that the Sankuanggou granodiorite also has a low initial Isr((87Sr/86Sr) i=0.7041~0.7045) ,high initial 143Nd/144Nd value((143Nd/144Nd) i=0.512556~0.512576) ,positive εNd(t) (2.8~3.9) ,young depleted-mantle model ages(tDM2=647~733Ma) and mantle-derived Pb isotopic characteristics.These geochemical characteristics indicate that the magma source of the Sankuanggou granodiorite may be mainly derived from deleted mantle source.The geochronology,geochemistry and isotope characteristics of the Sankuanggou granodiorite,combined with tectonic evolution of northeastern China,suggest that this deposit was formed in the magmatic arc setting,implying that its formation is probably related to the subduction of the paleo-Pacific Ocean during the Jurassic Period.
Keywords:LA-ICP-MS zircon U-Pb dating  Sr-Nd-Pb isotopes  Geochemistry  Metallogenic tectonic setting  Sankuanggou granodiorite  Skarn Fe-Cu deposit
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