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矿床地质  2005 

浙西寒武系底部黑色岩系含矿性和有用组分的赋存状态

Keywords: 地质学,黑色岩系,含矿性,伴生元素赋存状态,浙西

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Abstract:

通过对浙西寒武系底部黑色岩系分布区的区域地质和典型矿床的地质特征分析,阐述了黑色岩系的含矿性和伴生元素的赋存状态。黑色岩系的底部为厚度不等的磷块岩(结核)层,其上为金属层或石煤层,金属层的厚度与磷块岩的发育呈正相关,与石煤层的厚度呈负相关。在石煤层或其上部的碳质页岩中含黄铁矿层。石煤中伴生有钒、镍、钼、铜、铅、锌、铀、银和稀土元素,在部分地段可富集成矿。钒或以独立矿物存在,或以类质同象赋存在粘土矿物中;镍主要以独立矿物存在;钼主要与碳、硫、粘土一起呈钼硫化物胶状集合体,经热接触变质作用后形成辉钼矿;铀呈不均匀分散在胶磷矿和碳泥质中,呈类质同象或吸附状态存在;稀土元素主要呈类质同存在于胶磷矿中,部分呈吸附状态存在;铜、铅、锌主要以硫化物和硫砷化物等存在,多富集在金属层中。

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