黑吉东部砾岩型金矿成矿古地理环境

Paleoenvironment of the gravel-type gold mineralization in eastern Heilongjiang and Jilin

黑吉东部侏罗纪和第三纪时,地壳处于长期持续上升,基底裸露遭受剥蚀,为砾岩型金成矿提供物质来源,之后在相对稳定期大面积风化壳、夷平面、拗陷区、盆地、地堑和断裂带的形成为砾岩型金成矿提供了良好的沉积环境。温暖潮湿的古气候是砾岩型金矿成矿最适宜的环境。地壳构造运动和古气候条件与本区砾岩型金矿成矿关系密切。

At Jurassic period of Mesozoic era and Tertiary period of Cenozoic era in eastern Heilongjiang and Jilin, the crust had kept continuously rising up for a long time, the basement were bared and been denuded, this had supplied the material source for the gravel type gold mineralization. Later in the relative firm period, the formation of the large area's weathering crust, leveling surface, down-warping region, basin, graben and fault belt had made a fine sedimentary enviroment for the gravel-type gold mineralization. The warm and wet paleoclimate was the best climate for the gravel-type gold mieralization. The crustal structural movement and paleoclimate conditions were closely related to the gravel-type gold mineraliztion.