黑龙江布鲁嘎里河砂金矿地质特征及成因探讨

The geological characteristics and genetic discussion of Bulugali River place gold deposit, Heilongjiang

布鲁嘎里河砂金矿产于兴华渡口群下兴华组和晋宁期花岗岩分布区。研究区为低山丘陵 ,经长期风化剥蚀和堆积形成了一系列侵蚀堆积地貌。第四纪松散物覆盖在下兴华组地层和花岗岩之上。目前已圈定 2条矿体。矿体连续性好 ,平面上呈条带状 ,多为粒状、板状、片状。 NE、NW向断裂不但控制区内的地貌形态 ,也为砂金的形成提供了有利地质条件。砂金分布区应该是原生金矿 (化 )的集中区 ,在普查勘探砂金的同时更要注意寻找原生金矿 ,在兴华渡口群中出露的韧性剪切带是寻找原生金矿的有利部位。

The placer gold deposits in Bulugali River are located in the region with Xinghuadukou Group and Jinning Period granite. The area belongs to rolling topography, and becomes a series of erosional accumulation topography through long term weathering denude and accumulation. Lower Xinghua Group and granite are overlapped by Quatary sediments. Two orebodies is blocked out at present. The orebodies which are band shape on surface show good continuity. The native gold is mainly grained, slaty and flake shaped, its purity is 700~800. NE, NW trending faults not only control the morphology in the area, but also provide the favourable geologic conditions for the deposition of the placer gold. The area with placer gold distribution should be the area with the concentration of hard rock gold deposit. The ductile shear zone developed in Xinghuadukou Group is the advantageous section for the exploration of the hard rock gold deposit.