| 榆树沟层状堆积岩的岩石学与地球化学 |
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| 引用本文： | 姜常义,李良辰.榆树沟层状堆积岩的岩石学与地球化学[J].矿物岩石,1990,10(2):31-36. |
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| 作者姓名： | 姜常义 李良辰 |
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| 作者单位： | 西安地质学院，新疆石油学院 西安 710054，乌鲁木齐 830000 |
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| 摘 要： | 榆树沟层状堆积岩是该区蛇绿岩套的一个组成部分,总厚度约1200m.岩浆分离结晶作用比较彻底,形成了从纯橄岩到闪长岩的一系列岩石类型.伴随着岩浆的分离结晶过程,岩石的化学组成产生了系统的变化;矿物的种类、数量和成分亦随之而不断变化。稀土元素的总量完全受矿物相的种类和数量控制,配分曲线为轻稀土弱富集型,反映了形成于弧后盆地环境的特点。
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| 关 键 词： | 蛇绿岩套 堆积岩 岩石学 地球化学 |
PETROLOGY AND GEOCHEMISTRY OF LAYERED CUMULATION ROCKS IN YUSHUGOU, XINJIANG |
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| Jiang Changyi.PETROLOGY AND GEOCHEMISTRY OF LAYERED CUMULATION ROCKS IN YUSHUGOU, XINJIANG[J].Journal of Mineralogy and Petrology,1990,10(2):31-36. |
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| Authors: | Jiang Changyi |
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| Abstract: | The layered cumulation rocks, about 1200m thick, a part of ophiolitc in Yushugou, Xinjiang. They consist of a sries of rock type from dunit, lherzolit, gabbro to diorit, showing that the fractional crystallization of magma is relatively thorough. together with the process of fractional crystallization, chemical compositions of the rocks show systematic changes, and also the sort, quantity and composition of mirals continuously change with the volution of magma, The amount of REE is controlled by the sort and quantity of minral fas, the pattern of REE partition curves is slightly rich in light REE,showing that the layered cumulation roks were formed in the environment of back ar basin. |
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| Keywords: | Ophiolite suite cumulation rocks fractional crystallization mineralogy rare earth element |
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