Abstract:

ZhangjiakouXuanhua area is a gold, silver and polymetallic mineralization concentration area in Hebei. It can be divided into a gold deposit concentration area around the XuanhuaChongliChicheng magmaticmetamorphic core complex and a silver and polymetallic deposit distribution area in surrounding cover rocks. Studies indicate that the metallogenetic material of gold, silver and polymetallic deposits mainly came from deep Earth. In the process of multiplestage evolution of mantle plume, they moved up and concentrated as deposits in the favorable structures of mantle branch. This study takes the Dongping gold deposit in the core of mantle branch, the Huangtuliang gold deposit in detachment zone and the Wanquansi silvergold deposit in surrounding fault depression basin as examples to make analyses on their metallogenesis. It is considered that, horizontally from core to surroundings and vertically from deep to top, there exists zoning character of Au→Ag→PbZn deposits in ZhangjiakouXuanhua mantle branch, which has been confirmed by mining engineering and drilling engineering in many mines. This is significant for ore prospecting in deep. So it is proved that there is a great potential in the deep of ZhangjiakouXuanhua mantle branch. This approach may also  be applied to other mantle branch area with similar geological condition.

Key words: mantle plume, mantle branch, metallogenetic series, structurecontrolled mineralization, deep prospecting, ZhangjiakouXuanhua area