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华南地区新生代玄武岩中橄榄岩包体的含水性

, PP. 832-844

Keywords: 红外光谱,结构水,橄榄岩,华南地区

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Abstract:

?对华南地区广东英峰岭、广东徐闻张畴村、海南文昌福基田和福建林地的二辉橄榄岩包体进行了傅利叶变换红外光谱(FTIR)分析,结果显示包体中所有的辉石都含结构水,且所有的结构水以OH的形式存在,而所有的橄榄石都没有检测到明显的OH吸收峰,暗示其水含量(H2O的质量分数,下同)低于仪器的检出限(~2×10-6).广东英峰岭、广东张畴村、海南福基田、福建林地单斜辉石含水量分别为(293~981)×10-6,(183~752)×10-6,(73~586)×10-6和(51~423)×10-6,斜方辉石含水量分别为(82~471)×10-6,(74~571)×10-6,(53~170)×10-6和(9~135)×10-6,以体积分数计算的全岩结构水含量分别为(49~163)×10-6,(48~168)×10-6,(21~111)×10-6和(8~40)×10-6.结构水含量结果表明,各矿物颗粒间、包体间以及地区间结构水均存在不均一性,综合世界各地来看,岩石圈结构水含量存在大尺度的横向不均一性.与华北女山、汉诺坝及苏北盆地等地相比,同类包体全岩结构水含量明显偏高,但略低于世界其他富水地区.总的来讲,华南地区上地幔富水,暗示华南地区有可能经历了俯冲洋壳的流体交代作用.

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