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东天山黄山南镁铁-超镁铁岩体的岩浆演化过程:矿物学、Sr-Nd同位素特征的指示
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  • 英文篇名:Magma evolution of Huangshannan mafic-ultramafic intrusion in East Tianshan region: Indication from mineralogy and Sr,Nd isotopic characteristics
  • 作者:尤敏鑫 ; 李厚民 ; 王亚磊
  • 英文作者:YOU MinXin;LI Hou Min;WANG YaLei;MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,CAGS;
  • 关键词:东天山 ; 黄山南 ; 镁铁-超镁铁岩 ; 岩浆演化
  • 英文关键词:East Tianshan;;Huangshannan;;Mafic-ultramafic rocks;;Magma evolution
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室;
  • 出版日期:2018-11-15
  • 出版单位:岩石学报
  • 年:2018
  • 期:v.34
  • 基金:国土资源部公益性行业科研专项项目(201511020);; 国家自然科学基金项目(41602094、41603050)联合资助
  • 语种:中文;
  • 页:YSXB201811021
  • 页数:11
  • CN:11
  • ISSN:11-1922/P
  • 分类号:258-268
摘要
黄山南镁铁-超镁铁质岩体位于东天山造山带觉罗塔格构造带内,属于土墩-黄山-图拉尔根镁铁-超镁铁质岩带。本文在前人研究的基础上,从橄榄石、辉石矿物学组成和全岩Sr、Nd同位素等方面对黄山南岩体进行了分析研究,并与黄山、黄山东、香山等典型含矿岩体作了对比,旨在进一步查明黄山南岩体的岩浆源区和母岩浆性质及其岩浆演化过程。Sr-Nd同位素特征表明黄山南岩体来自一个弱亏损的地幔源区,相较黄山、黄山东、香山等岩体的源区具有更加富集的特征。黄山南岩体中的橄榄石属于贵橄榄石,斜方辉石主要为古铜辉石,少数为紫苏辉石,单斜辉石主要为顽透辉石、普通辉石和少数的透辉石。单斜辉石和橄榄石的成分特征表明形成黄山南岩体的母岩浆为演化程度较低的拉斑玄武质岩浆,且母岩浆成分具有高Mg、高Ni的特点。计算得到黄山南岩体母岩浆的Fe O~T=13.20%、MgO=16.96%、Ni=377.2×10~(-6),且母岩浆在结晶分异过程中没有经历充分的硫化物熔离作用,这也是造成母岩浆中Ni含量较高以及岩体含矿性较差的主要因素。
        The Huangshannan mafic-ultramafic intrusion,located in the Jueluotage tectonic zone,East Tianshan orogenic belt,belongs to the Tudun-Huangshan-Tulaergen mafic-ultramafic rock belt.Based on previous research work,the mineral compositions of olivines and pyroxenes of this intrusion,as well as its whole rock Sr-Nd isotopic characteristics were studied in this paper.Further more,by comparison with typical intrusions in the same region,such as the Huangshan,the Huangshandong and the Xiangshan,we try to find its magma source,and to detect the properties and the evolutionary process of its parental magma.The results of Sr-Nd isotopic characteristics of the Huangshannan intrusion indicate that its source comes from a slightly depleted mantle,which is a more enriched mantle source compared with those for the Huangshan,the Huangshandong and the Xiangshan intrusions.All of the olivines from the Huangshannan intrusion are chrysolite.The orthopyroxenes are mainly composed of broncite,with small amount of amblystegite.The clinopyroxenes mainly consist of augite and diopside.The compositions of clinopyroxene and olivine indicate that the parental magma of the Huangshannan intrusion is tholeiitic basalt magma with a low evolution degree,with High Mg and Ni contents.The calculated contents of the parental magma of the Huangshannan intrusion is as follows:Fe O~T=13.20%,MgO=16.96%,Ni=377.2×10~(-6).We also realize that the parental magma doesn’t experience a sufficient sulfide segregation process,which dominantly lead to the high Ni content in its parental magma and poor metallogenetic potentiality of the Huangshannan intrusion.
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