超高压变质作用不同阶段的流体变化:碧溪岭榴辉岩的氢、硼同位素分析

被引:6
作者
夏群科
盛英明
Etienne DELOULE
机构
[1] 中国科技大学地球和空间科学学院化学地球动力学研究实验室
[2] 法国国家科研中心岩石学和地球化学研究中心
关键词
碧溪岭; 榴辉岩; 氢同位素; 硼同位素; 变质流体;
D O I
暂无
中图分类号
P597 [同位素地质学与地质年代学];
学科分类号
摘要
大别山碧溪岭榴辉岩中有三种含水矿物:多硅白云母、角闪石和黑云母,它们分别是超高压(UHP)阶段(即柯石英榴辉岩相阶段)或者石英榴辉岩相阶段、退变质后成合晶阶段和角闪岩相退变质阶段的产物,本文利用离子探针技术对它们进行了氢同位素和硼同位素的分析。三种矿物内部的同位素组成都是均一的,多硅白云母的δD为-105‰±9‰,δ11B为-25.9‰±2.0‰;角闪石的δD为-100‰±9‰,δ11B为-24.4‰±0.9‰;黑云母的δD为-65‰±4‰,δ11B为-19.3‰±1.3‰。多硅白云母和角闪石的氢-硼同位素组成在误差范围内是相同的,而和黑云母则有明显的差别,这表明,从UHP阶段或者石英榴辉岩相阶段到随后的后成合晶阶段,变质流体是内部缓冲的,而在角闪岩相变质阶段,则有了外来流体的加入,这个流体是相对富集D和11B的。碧溪岭榴辉岩矿物相对于其地壳原岩表现出低δ11B的特征,说明俯冲过程中板块经历了强烈的脱硼。
引用
收藏
页码:677 / 684
页数:8
相关论文
共 23 条
  • [1] 大别山超高压变质岩后成合晶矿物中微细流体包裹体的透射电镜研究
    孟大维
    吴秀玲
    樊孝玉
    黄利武
    孙凡
    郑建平
    [J]. 矿物岩石, 2007, (01) : 1 - 6
  • [2] The systematics of boron isotopes in Izu arc front volcanic rocks[J] . Susanne M. Straub,Graham D. Layne.Earth and Planetary Science Letters . 2002 (1)
  • [3] Fluid processes during the exhumation of high-P metamorphic belts
    Miller, JA
    Buick, IS
    Cartwright, I
    Barnicoat, A
    [J]. MINERALOGICAL MAGAZINE, 2002, 66 (01) : 93 - 119
  • [4] Fluid inclusions in coesite‐bearing eclogites and jadeite quartzite at Shuanghe, Dabie Shan (China)[J] . B.Fu,J.L.R.Touret,Y.‐F.Zheng.Journal of Metamorphic Geology . 2001 (5)
  • [5] Boron isotope systematics of slab fluids as inferred from a serpentine seamount, Mariana forearc[J] . Laurie D. Benton,Jeffrey G. Ryan,Fouad Tera.Earth and Planetary Science Letters . 2001 (3)
  • [6] Boron recycling in the continental crust of the central Andes from the Palaeozoic to Mesozoic, NW Argentina[J] . Simone Kasemann,J?rg Erzinger,Gerhard Franz.Contributions to Mineralogy and Petrology . 2000 (3)
  • [7] Stable isotope geochemistry of marbles from the coesite UHP terrains of Dabieshan and Sulu, China[J] . Douglas Rumble,Qingchen Wang,Ruyuan Zhang.LITHOS . 2000 (1)
  • [8] Carbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in China[J] . Yong-Fei Zheng,Bing Gong,Yiliang Li,Zhengrong Wang,Bin Fu.Chemical Geology . 2000 (3)
  • [9] Fluid-rock interactions during high-pressure and ultrahigh-pressure metamorphism
    Philippot, P
    Rumble, D
    [J]. INTERNATIONAL GEOLOGY REVIEW, 2000, 42 (04) : 312 - 327
  • [10] Hydrogen and oxygen isotope evidence for fluid–rock interactions in the stages of pre- and post-UHP metamorphism in the Dabie Mountains[J] . Yong-Fei Zheng,Bin Fu,Yilin Xiao,Yiliang Li,Bing Gong.LITHOS . 1999 (4)