| 贵州梵净山区层状超基性岩特征及其成因的初步探讨 |
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| 引用本文： | 凌长富,莫耀支,王砚耕.贵州梵净山区层状超基性岩特征及其成因的初步探讨[J].地质科学,1975,10(4):343-351. |
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| 作者姓名： | 凌长富 莫耀支 王砚耕 |
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| 作者单位： | 贵州108地质队 |
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| 摘 要： | 梵净山区位于贵州省东北部。本文对该区蛇绿岩套中之层状超基性岩特征及其成因,进行初步探讨,为研究我国超基性岩提供一些实际资料。
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FEATURES OF BEDDED ULTRABASIC ROCKS IN FANJINSHAN REGION OF GUIZHOU PROVINCE AND A PRELIMINARY DISCUSSION OF THEIR ORIGIN |
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| Abstract: | The fanjinshan region lies in a Proterozoic island arc, in which occurs slightly metamorphosed Fanjinshan group of great thickness, with its lower part marked by a suite of ophiolite consisting of bedded ultrabasic rocks and basic lava. According to the differential sequence, the rocks of this group may be divided into two rock associations: spilite-ultrabasic and diabase-ultrabasic. In their middle-lower part exist ultrabasic rocks including pyroxene-peridotite, olivene pyroxenite, pyroxe-nite and feldspar-bearing pyroxenite. Their chemical composition is characterized by being rich in aluminium and poor in calc-alkaline, so they may be regarded as fer-romagnesian ultrabasic rocks. By analyzing practical data it is suggested that the ultrabasic rocks belong to the products of differentiation in situ of submarine basic lava. |
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