缅甸硬玉岩区的硬玉化绿辉石岩

易晓 施光海 何明跃. 缅甸硬玉岩区的硬玉化绿辉石岩[J]. 岩石学报, 2006, 22(4): 971-976.
引用本文: 易晓 施光海 何明跃. 缅甸硬玉岩区的硬玉化绿辉石岩[J]. 岩石学报, 2006, 22(4): 971-976.
YI Xiao SHI GuangHai HE MingYue China University of Geosciences,Beijing 100083,China. Jadeitized omphacitite from Myanmar jadeite area[J]. Acta Petrologica Sinica, 2006, 22(4): 971-976.
Citation: YI Xiao SHI GuangHai HE MingYue China University of Geosciences,Beijing 100083,China. Jadeitized omphacitite from Myanmar jadeite area[J]. Acta Petrologica Sinica, 2006, 22(4): 971-976.

缅甸硬玉岩区的硬玉化绿辉石岩

  • 基金项目:

    国家自然科学基金项目(40221402和40234045)资助

Jadeitized omphacitite from Myanmar jadeite area

  • 绿辉石岩是缅甸硬玉岩区一种新的岩石类型,普遍遭受多期次硬玉化.未发生硬玉化的绿辉石含较高TFeO和CaO,但较低的MgO,按化学成分分类部分已属霓石-普通辉石系列的中间相.这种绿辉石很可能是硬玉质的流体/熔体交代地幔辉石岩类的产物,与主期大规模硬玉岩的结晶、钠质-钠钙质角闪石边和钠铬辉石的形成同期或稍后,是该区第Ⅰ期的硬玉化.沿绿辉石的解理或裂隙交代并伴有充填的硬玉是在相对拉张的构造背景下形成的,是该区第Ⅱ期的硬玉化.切割早期绿辉石和硬玉的充填硬玉细脉可能是最晚一期的硬玉化.硬玉化绿辉石岩的结构与显微构造特征指示了在缅甸硬玉岩区,至少存在不少于3期的硬玉化的交代充填作用.文中讨论了硬玉化物质的可能来源,认为其可能与俯冲板片上的沉积物有密切关系.
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出版历程
收稿日期:  2005-06-09
修回日期:  2005-12-02
刊出日期:  2006-04-30

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