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    蛇绿岩中铬铁岩母岩浆的富Ca特征:矿物包裹体证据

    刘霞 苏本勋 白洋 陈晨 肖燕 梁子 杨赛红 彭青山 苏本灿 刘斌

    刘霞, 苏本勋, 白洋, 陈晨, 肖燕, 梁子, 杨赛红, 彭青山, 苏本灿, 刘斌, 2018. 蛇绿岩中铬铁岩母岩浆的富Ca特征:矿物包裹体证据. 地球科学, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707
    引用本文: 刘霞, 苏本勋, 白洋, 陈晨, 肖燕, 梁子, 杨赛红, 彭青山, 苏本灿, 刘斌, 2018. 蛇绿岩中铬铁岩母岩浆的富Ca特征:矿物包裹体证据. 地球科学, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707
    Liu Xia, Su Benxun, Bai Yang, Chen Chen, Xiao Yan, Liang Zi, Yang Saihong, Peng Qingshan, Su Bencan, Liu Bin, 2018. Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions. Earth Science, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707
    Citation: Liu Xia, Su Benxun, Bai Yang, Chen Chen, Xiao Yan, Liang Zi, Yang Saihong, Peng Qingshan, Su Bencan, Liu Bin, 2018. Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions. Earth Science, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707

    蛇绿岩中铬铁岩母岩浆的富Ca特征:矿物包裹体证据

    doi: 10.3799/dqkx.2018.707
    基金项目: 

    国家自然科学基金 91755205

    国家自然科学基金 41772055

    岩石圈演化国家重点实验室 专201701

    详细信息
      作者简介:

      刘霞(1996-), 女, 大学本科生, 研究方向为蛇绿岩中铬铁矿成矿作用

      通讯作者:

      苏本勋

    • 中图分类号: P611

    Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions

    • 摘要: 铬铁矿作为蛇绿岩中的重要矿产,其成矿母岩浆性质及演化一直存在较大争议.铬铁矿的矿物包裹体同时或先于铬铁矿结晶,其成分和类别能很好地记录成矿母岩浆性质和演化过程.土耳其Pozantı-Karsantı蛇绿岩不同类型铬铁岩的铬铁矿中发现了多种类型包裹体:不含水硅酸盐矿物(如橄榄石和单斜辉石)、含水硅酸盐矿物(如角闪石和金云母)、复合型矿物包裹体(如蛇纹石、硅灰石和单斜辉石的复合型包裹体)和不常见矿物(如磷灰石、铂族元素硫化物).含水矿物包裹体的出现以及矿物的高Mg#特征(如橄榄石Fo=95.4~97.1;单斜辉石Mg#=92.0~99.9;角闪石Mg#=88.9~99.8)表明结晶铬铁矿的母岩浆具有富水、富Mg的特征.同时,除钙铬榴石和磷灰石的包裹体外,在铬铁矿中首次发现富Ca矿物方解石和硅灰石,其中方解石和菱镁矿以复合型包裹体形式产出,硅灰石则分布于蛇纹石矿物包裹体中.这些富Ca矿物的出现以及硅酸盐矿物的高CaO含量均揭示了铬铁岩母岩浆的富Ca特征.母岩浆中的Ca组分可能来源于俯冲板块中富Ca岩石/矿物的部分熔融,Ca离子的大量出现使得Cr3+在熔体中更加稳定,同时富Ca矿物的结晶促进了岩浆中Cr的进一步富集而利于铬铁矿的大量结晶沉淀.

       

    • 图  1  土耳其蛇绿岩分布图(a),Pozantı-Karsantı蛇绿岩地质简图(b)和Pozantı-Karsantı蛇绿岩柱状剖面图(c)

      图a据Robertson(2002)修改;图b据Su et al.(2018)修改;图c据Saka et al.(2014)修改

      Fig.  1.  Distribution of ophiolites in Turkey (a), simplified geologic map (b) and columnar section of the Pozantı-Karsantı ophiolite (c)

      图  2  土耳其Pozantı-Karsantı蛇绿岩不同类型铬铁矿石野外及扫描薄片照片

      a.多种类型矿石;b.反豆状结构矿石;c.豆状矿石;d.块状矿石;e.半块状/豆状矿石;f.稀疏浸染状矿石;g.似层状铬铁矿石

      Fig.  2.  Field and scanned photos showing different textures and structures of chromitite in the Pozantı-Karsantı ophiolite in Turkey

      图  3  土耳其Pozantı-Karsantı蛇绿岩铬铁矿成分相关性图解

      a.铬铁矿Al2O3和TiO2的成分相关性图解,据Kamenetsky et al.(2001);b.铬铁矿Cr#和TiO2的成分相关性图解,据Pagé and Barnes(2009).MOR.大洋中脊;MORB.大洋中脊玄武岩;LIP.大火成岩省玄武岩;OIB.洋岛玄武岩;ARC.岛弧火山岩;SSZ.俯冲带之上

      Fig.  3.  Correlation diagrams of compositions of chromite in chromitite in the Pozantı-Karsantı ophiolite in Turkey

      图  4  土耳其Pozantı-Karsantı蛇绿岩铬铁矿中不同类型的硅酸盐矿物包裹体

      a, b.自形橄榄石(Ol);c, d.半自形橄榄石;e, f.自形六边形橄榄石;g, h.他形浑圆状橄榄石;i.单斜辉石(Cpx)矿物集合体;j.近八边形自形单斜辉石;k.半自形单斜辉石;l.他形长条状单斜辉石;m.角闪石(Amp)矿物集合体;n.近菱形自形角闪石;o.半自形长柱状角闪石;p.他形浑圆状角闪石;q.港湾状角闪石;r.金云母(Phl)矿物集合体;s.近五边形自形金云母;t.七边形自形金云母

      Fig.  4.  BSE images showing various types of silicate inclusions with different shapes and sizes in chromite in the Pozantı-Karsantı ophiolite in Turkey

      图  5  土耳其Pozantı-Karsantı蛇绿岩铬铁矿中不同类型复合型包裹体的背散射图像

      a.单斜辉石和金云母的复合型包裹体;b.单斜辉石、硅灰石(Wo)和蛇纹石(Srp)的复合型包裹体;c.单斜辉石、绿泥石(Chl)和菱镁矿(Mgs)的复合型包裹体;d.金云母和蛇纹石的复合型包裹体

      Fig.  5.  BSE images showing different types of composite inclusions in chromite in the Pozantı-Karsantı ophiolite in Turkey

      图  6  土耳其Pozantı-Karsantı蛇绿岩铬铁矿中不常见的矿物包裹体

      a.方解石(Cal)和绿泥石的复合型包裹体;b.硅灰石、绿泥石、蛇纹石的复合型包裹体;c.磷灰石(Ap)和单斜辉石的复合型包裹体;d.钙铬榴石(Uv)和单斜辉石的复合型包裹体;e.钙铬榴石;f.斜长石(Pl)和蛇纹石的复合型包裹体;g.半自形角闪石和铂族元素硫化物的复合型包裹体;h.铂族元素硫化物和他形角闪石的复合型包裹体;i.柱状铂族元素硫化物

      Fig.  6.  BSE images of uncommon mineral inclusions in chromite in the Pozantı-Karsantı ophiolite in Turkey

      图  7  土耳其Pozantı-Karsantı蛇绿岩中铬铁矿的矿物包裹体背散射图和元素分布

      a.橄榄石;b.单斜辉石;c.单斜辉石和金云母的复合型包裹体

      Fig.  7.  BSE images and elemental distribution mapping of mineral inclusions in chromite in the Pozantı-Karsantı ophiolite in Turkey

      图  8  土耳其Pozantı-Karsantı蛇绿岩铬铁矿中橄榄石(a)、单斜辉石(b, c)和角闪石(d)包裹体的成分相关性图解

      玻安岩和大洋中脊玄武岩数据来自GEOROC,http://georoc.mpch-mainz.gwdg.de/georoc/Start.asp

      Fig.  8.  Compositional correlation diagrams for olivine (a), clinopyroxene (b, c) and amphibole (d) inclusions in chromite in the Pozantı-Karsantı ophiolite in Turkey

      图  9  土耳其Pozantı-Karsantı蛇绿岩中铬铁矿的矿物包裹体特征

      a.新鲜的单斜辉石和蚀变的蛇纹石;b.新鲜的橄榄石和蚀变蛇纹石;c.单斜辉石和磷灰石的复合型包裹体;d.新鲜的橄榄石包裹体

      Fig.  9.  Occurrence of inclusions in chromite in the Pozantı-Karsantı ophiolite in Turkey

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    • 收稿日期:  2017-12-18
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