生物活动在吉林东南部寒武纪沉积铜形成过程中的作用

Function of Bioactivities in the Formation of the Sedimentary Copper of the Cambrian in the Southeastern of Jilin, China

吉林东南部寒武纪沉积铜主要为沉积和后期热液改造综合作用的产物。它们在形成过程中,生物活动起了很大的作用,生物直接成因标志和间接成因迹象在本区都有体现。前者主要表现在由藻类群落形成的有机质胶体和胶团中聚集了大量的黄铜矿和黄铁矿颗粒,草莓状构造即为其典型构造之一。后者则为由生物形成的有机酸在通过红色矿源层时形成可溶性有机铜盐,并运移到适当部位富集起来,形成具一定程度的矿化现象。“圈闭构造”在形成本区这类矿化现象中起到了十分重要的作用。

Cambrian in the southeastern sedimentary copper Jilin is considered to be the products of sedimentation and later reworking. Bioagency had played very important in forming process. In the area, evidence of bioactivities is clearly seen. In organic collcid, a lot of is related to collected granules of chalcopyrite. When organic acid produced by bioactivities passed red rock layers containing copper, organic copper salts were formed. After the salts were carried into a special sites, they formed biochemical - sedimentary deposit of copper.