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吉林红旗岭镁铁-超镁铁质岩体地球化学特征及其岩石成因意义
投稿时间:2016-11-15  修订日期:2017-03-06  点此下载全文
引用本文:李爱,王建,宋樾,刘建国,薛胜超.2018.吉林红旗岭镁铁-超镁铁质岩体地球化学特征及其岩石成因意义[J].地质学报,92(2):263-277
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作者单位E-mail
李爱 1) 吉林大学地球科学学院长春130061 liai1806@126.com 
王建 1) 吉林大学地球科学学院长春130061 wangjian304@jlu.edu.cn 
宋樾 1) 吉林大学地球科学学院长春130061  
刘建国 1) 吉林大学地球科学学院长春130061  
薛胜超 2) 中国地质大学地质过程与矿产资源国家重点实验室北京100083  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:红旗岭铜镍硫化物矿床位于兴-蒙造山带东部。矿区出露30多个镁铁-超镁铁质侵入体,主要由橄榄岩、辉石岩和辉(苏)长岩组成。本文通过对红旗岭含矿镁铁-超镁铁质岩体的主、微量及铂族元素(PGE)的研究,探讨了红旗岭岩体成矿母岩浆性质、PGE亏损的原因以及岩体形成的构造环境。全岩主、微量元素地球化学分析表明,红旗岭岩体具有高MgO(平均2875%)、低TiO2(平均044%),富集轻稀土元素(LREE)、亏损高场强元素(HFSE),极低ΣPGE(平均208×10-9)和高Cu/Pd(平均2916×103)的特征。岩石样品显示相似的微量和PGE配分模式,表明其来源于相同的岩浆源区。根据橄榄石-熔体平衡及质量平衡原理估算出红旗岭母岩浆为高镁玄武质岩浆(MgO=1074%、FeO=778 %)。红旗岭母岩浆在早期演化过程中发生硫化物熔离作用导致了红旗岭含矿岩体PGE的极度亏损。结合中亚造山带东段构造演化历史,本文认为红旗岭岩体形成于晚三叠世碰撞后伸展环境,矿床的形成受到了古亚洲洋俯冲结束后板片断离的影响。
中文关键词:镁铁-超镁铁质岩体  母岩浆  硫化物熔离  铂族元素  吉林红旗岭
 
Geochemistry Characteristics of the Ore bearing Mafic-Ultramafic Intrusions in the Hongqiling Ni-Cu Sulfide Deposit,NE China and Its Petrogenesis Significance
NameInstitution
LI Ai1) College of Earth Sciences,Jilin University,Changchun, 130061,China
WANG Jian1) College of Earth Sciences,Jilin University,Changchun, 130061,China
SONG Yue1) College of Earth Sciences,Jilin University,Changchun, 130061,China
LIU Jianguo1) College of Earth Sciences,Jilin University,Changchun, 130061,China
XUE Shengchao2) State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing, 100083,China
Abstract:The Hongqiling magmatic Ni Cu sulfide deposits are situated at the southern margin of the eastern section of the Xing’an Mongolian Orogenic Belt. Over 30 mafic and ultramafic intrusions consisting mainly of peridotite, pyroxenite and gabbro crop out in the mining area. This paper analyzed the nature of parent magma, and PGE depletion and tectonic setting of these ore bearing mafic ultramafic intrusions of the Hongqiling intrusions using geochemical study of major elements, trace elements and PGE. Analysis of major elements and trace elements shows that the Hongqiling intrusions are characterized by high MgO (2875%) and low TiO2 (044%), enrichment of light rare earth element (LREE) and depletion of high field strength elements (HFSE), as well as extremely low ΣPGE(averaging 208×10-9)and high Cu/Pd(averaging 2916×103). These features suggest that they have the same magmatic source. Based on olivine liquid equilibrium and mass balance, the calculated compositions of the parental magma for the Hongqiling Ni Cu Sulfide deposit is a high Mg basaltic magma with MgO of 1074% and FeO of 778%, respectively. Immiscible separation of sulfides likely resulted in extremely loss of PGEs in the Hongqiling ore bearing intrusions during early evolution of parental magma of the Hongqiling intrusions. Combined with the evolution history of the eastern segment of the Central Asian orogenic belt, it can be concluded that the Hongqiling intrusions formed in the late Triassic post collisional extensional environment, with formation of the deposits affected by the slab break off after subduction of the Ancient Asian ocean.
keywords:Mafic-ultramafic intrusion  parental magma  sulfide segregation  platinum group elements  Hongqiling  Jinlin
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