<p align="left">元古宙蛇绿岩研究中有关问题的讨论

doi:10.11867/j.issn.1001-8166.1999.05.0468

经过20余年的不懈努力,元古宙蛇绿岩研究已取得了巨大进展。元古宙蛇绿岩的保存特点、多样性、高压超高压变质作用、地质年代学及研究方法(方法论)等几个关键问题尚需进一步探索。我国元古宙蛇绿岩研究应加强构造—岩性的综合研究,并通过同位素测年和地球化学示踪,获取可信的成因信息;同时,还需考虑元古宙洋壳的地球化学特殊性及后期变形变质作用的影响,不能简单套用显生宙蛇绿岩的判别图解和研究方法。

关键词: 元古宙, 蛇绿岩, 地质特征, 多样性, 高压超高压变质作用, 研究方法

The Proterozoic ophiolite research has achieved gigantic progress in the recent two decades.Some critical problems such as preservation,diversity,high-pressure metamorphism,geochronology and methodology for the Proterozoic ophiolite need to be further explored. The Proterozoic ophiolite has diversity characteristics in time-space distribution ,type of end-members, metamorphism, geotectonic setting and constraint of magmatic reservior. The high-ultrahigh pressure metamorphic rock that its primitive rock is the Proterozoic ophiolite may be another preservation form of the Proterozoic ophiolite.The discrimination of the Proterozoic ophiolite must be on the basis of systematical study for tectonic mapping, isotopic geochronology and geological-geochemical characteristics. Therefore, the Proterozoic ophiolite research in China should strengthen the synthetical study of tectonic mapping-petrographic analysis,and acquires the dependable information about ophiolite genesis through isotopic dating and geochemical study.The geochemical particularity of Proterozoic oceanic crust and influence of later stage deformation-metamorphism have evident constraint for the formation and evolution of the Proterozoic ophiolite,so we can not apply the discriminative figures and research methods about Phanerozoic ophiolite mechanically to the study of the Proterozoic ophiolite.

Key words: Proterozoic ophiolite, Geologic characteristics, Diversity, High-ultrahigh pressure metamorphism, Methodology.

中图分类号:

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DISCUSSION ON PROBLEMS CONCERNING THE PROTEROZOIC OPHIOLITE STUDY