卡姆斯特蛇绿混杂岩的岩石学研究及其地质意义
Petrology of the Kamste ophiolite mélange from east Junggar, Xinjiang, NW China
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摘要: 东准噶尔卡姆斯特蛇绿岩剖面由玄武岩、变辉长岩、辉石岩、蛇纹石片岩、硅质岩和火山碎屑岩等组成。辉石不发育出溶结构。说明地幔岩侵位过程相对缓慢（从上地幔到下地壳迁移过程中没有发生突然抬升或者胛条件的巨大改变）。辉石岩中存在三类角闪石：具有出溶结构的角闪石（Amp Ⅰ，镁绿钙闪石），与Amp Ⅰ共生的均匀角闪石（Amp Ⅱ，镁质普通角闪石），以及交代单斜辉石边部的角闪石（Amp Ⅲ，钙镁闪石质普通角闪石）。基于对辉石岩和变辉长岩中角闪石的化学组成及其结构的仔细研究，获得该蛇绿岩侵位的基本演化特征如下：地幔岩在中下地壳环境被快速抬升，导致辉石岩中的角闪石分解而形成铬磁铁矿出溶结构，当蛇绿岩侵位到中地壳环境后，岩石经受角闪岩相退变质改造，继续上升到上地壳环境后，岩石发生绿片岩相的退变质。
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Key words:
- Junggar /
- Kelameili /
- Ophiolite /
- Pyroxenite /
- Amphibole /
- Exsolution texture
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