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首页> 外文期刊>Bulletin of the National Research Centre >On Chromite Mineralization and Hosting Serpentinites at Gebel Um Khasila area, Eastern Desert, Egypt
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On Chromite Mineralization and Hosting Serpentinites at Gebel Um Khasila area, Eastern Desert, Egypt

机译：埃及东部沙漠Gebel Um Khasila地区的铬铁矿成矿和蛇纹岩赋存

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摘要

The present work deals with serpentinites and the associated chromite mineralization at Gebel Um Khasila area in the Central Eastern Desert, Egypt. Chromite occurs as lenses localized along thrust faults in serpentinites. The serpentinites were formed principally after peridotite to dunite constituting the base of ultramafic rocks of a dismembered ophiolite sequence. The serpentinites are similar to Alpine - type ultramafic rocks. The predominant occurrence of antigorite is almost identical to the regionally metamorphosed antigorite serpentinites. The chromite mineralization occurs as massive, nodular and disseminated crystals and may exhibit a pull-part texture. Alteration of chromite was initiated simulteaneously with the serpentinization and probably accelerated with the intrusion of the metagabbro-diorite, masses. Reaction rims of chromite with host rock was possibly initiated by ascending Fe-rich solution and altering the chromite composition.
机译：目前的工作涉及在埃及中部东部沙漠的Gebel Um Khasila地区的蛇纹岩和相关的铬铁矿成矿。当晶状体沿着蛇纹岩中的冲断层定位时，铬铁矿就会出现。蛇纹岩主要是在橄榄岩到辉光岩之后形成的，构成了蛇绿岩序列的超镁铁质岩基。蛇纹岩类似于高山型超镁铁质岩石。蛇纹石的主要发生位置与区域变质的蛇纹石蛇纹岩几乎相同。亚铬酸盐矿化以块状，结节状和散布的晶体形式出现，并可能表现出拉动部分的质地。蛇纹石化同时引发亚铬铁矿的变化，并且可能随着异辉石闪长岩团的侵入而加速。富铁溶液的加入和铬铁矿成分的改变可能引发了铬铁矿与主岩的反应边缘。

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