华北地台北缘金矿床成矿时代讨论

汇集了华北地台北缘２１个金矿床的４５个直接测年数据，对这些数据的可信度作了评述。选用矿石或蚀变围岩中的绢云母、黑云母、钾长石等蚀变矿物作为测年对象，采用Ａｒ－Ａｒ，Ｋ－Ａｒ法或Ｒｂ－Ｓｒ等时线法测年在目前的技术条件下是经济可行的，关键是要保证被测矿物确为蚀变矿物并且纯度较高。用Ｕ－Ｐｂ法测定矿脉中的水热锆石为确定成矿年龄，但如何区分继承锆石和水热浩石尚不成熟，以地质观察为基础，充分利用上述测试数据

Discussion on the metallogenetic epoch of gold deposit on north fringe of North China platform

On the north fringe of North China platform, 45 direct age determination data of 21 gold deposits have been collected. Minerals or altered minerals such as sericite, biotite and K feldspar in the altered wallrocks are selected to be objects of age determination, and the Ar Ar, K Ar, Rb Sr, U Pb isochron dating methods are adopted. The magmatic epithermal gold deposit in the region and most gold deposit inner and outer intrusive contact zone are mineralized in Mesozoic Yanshan Period. The metallogenic epoch of Jiapigou gold deposit is Upper Paleozoic Hercynian Period and probably superimposed by mineralization of Yanshan Period. Jinchangyu gold deposit in northern Hebei is superimposed by early Precambrian mineralization and late Paleozoic mineralization. Gold metallogenic epoch in Zhangxuan and Wulashan is probably Mesozoic Yanshan Period, which needs further research.