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    CCSD超高压榴辉岩中的水: 红外光谱分析

    徐薇 刘祥文 金振民

    徐薇, 刘祥文, 金振民, 2006. CCSD超高压榴辉岩中的水: 红外光谱分析. 地球科学, 31(6): 830-838.
    引用本文: 徐薇, 刘祥文, 金振民, 2006. CCSD超高压榴辉岩中的水: 红外光谱分析. 地球科学, 31(6): 830-838.
    XU Wei, LIU Xiang-wen, JIN Zhen-min, 2006. Water in UHP Eclogites at CCSD: FTIR Analysis. Earth Science, 31(6): 830-838.
    Citation: XU Wei, LIU Xiang-wen, JIN Zhen-min, 2006. Water in UHP Eclogites at CCSD: FTIR Analysis. Earth Science, 31(6): 830-838.

    CCSD超高压榴辉岩中的水: 红外光谱分析

    基金项目: 

    国家重点基础研究项目 2003CD716506

    国家自然科学基金委员会“创新研究群体科学基金”项目 40521001

    湖北省自然科学基金项目 2006ABA350

    地质过程与矿产资源国家重点实验室开放基金项目 GPMR0519

    详细信息
    • 中图分类号: P588.3

    Water in UHP Eclogites at CCSD: FTIR Analysis

    • 摘要: 超高压变质岩中名义上无水矿物(NAMs) 在板块俯冲过程中可以携带一部分地表水进入上地幔, 这些水储存于地球深部并对地幔动力学有着重要的影响.对中国大陆科学钻探主孔榴辉岩中的绿辉石和石榴石进行了详细的显微傅立叶变换红外光谱(Micro-FTIR) 分析, 结果显示所有绿辉石和石榴石颗粒都含有结构水, 其水含量范围分别在68~29μg/g和20~75μg/g.榴辉岩全岩的水含量为150~300μg/g.绿辉石和石榴石结构水含量的分布出现2种情况: (1) 颗粒内部的均一分布; (2) 不均匀分布, 表现为水含量从核部到幔部到边部随之增加或水含量核部、边部低而幔部高.电子探针结果表明水含量分布不均与矿物化学成分无直接关系.位错分布不均匀可能导致了颗粒内部结构水分布的不均匀.

       

    • 图  1  CCSD主孔榴辉岩中石榴石的代表性红外光谱(a); CCSD主孔和毛北地表的榴辉岩中绿辉石的代表性红外光谱(b)

      Fig.  1.  Representative spectra of garnets (a) and omphacites (b) from UHP eclogites at CCSD main hole and Maobei

      图  2  CCSD主孔榴辉岩中石榴石(a) 和绿辉石的代表性红外光谱(b)

      Fig.  2.  Representative spectra of garnets (a) and omphacites (b) from UHP eclogites at CCSD main hole

      表  1  CCSD主孔和毛北地区榴辉岩中绿辉石的红外光谱分析结果

      Table  1.   FTIR analysis of omphacites from UHP eclogites at CCSD main hole and Maobei

      表  2  CCSD主孔和毛北地区榴辉岩中石榴石的红外光谱分析结果

      Table  2.   FTIR analysis of garnets from UHP eclogites at CCSD main hole and Maobei

      表  3  CCSD主孔和毛北地表榴辉岩中石榴石的化学组成

      Table  3.   Chemical compositions of garnets in eclogites from CCSD main hole and Maobei

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    • 收稿日期:  2006-04-06
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