藏南隆子县姐纳各普金锑矿区角砾岩特征及意义

Breccias from the Jienagepu Au-Sb deposit in the Lhunze region,southern Xizang: Characteristics and geological implications

姐纳各普金锑矿床是藏南喜马拉雅铅锌金锑成矿带东段近年来新发现的一个具有进一步找矿潜力的金锑矿床,矿区发育大量的角砾岩。通过对角砾岩开展详尽的岩石学研究,将矿区角砾岩划分为3个类型,即沉积角砾岩、断层角砾岩、岩溶-构造角砾岩。沉积角砾岩形成于侏罗纪快速堆积环境,可能与泥石流有关。断层角砾岩和构造-岩溶角砾岩是金锑矿化的主要容矿岩石,为铅锌矿与金锑矿的找矿标志,在今后的找矿工作中应予以高度重视。

The Jienagepu Au-Sb deposit as a newly discovered potential Au-Sb deposit resides in the eastern part of the Himalayan Pb-Zn-Au-Sb metallogenic belt in southern Xizang. The breccias are found to be well developed in the Jienagepu Au-Sb mining district,and may be classified,on the basis of detailed petrographic studies,into three types： sedimentary breccias, fault breccias and karst-structural breccias. The sedimentary breccias were accumulated in the rapidly deposited environments associated with debris flows during the Jurassic. The fault breccias and karst-structural breccias are considered as the host rocks of Au and Sb mineralization,and thus may be selected as the prospecting criteria for the Pb-Zn and Au-Sb deposits in the study area.