摘要
本文根据较新资料分析冀东北地区的大地构造演化规律对金矿成矿规律的控制作用。由于该区的地壳经过前地槽、地槽、地台和地洼四大不同发展阶段,因而在不同大地构造发展阶段中形成不同的金矿类型:前地槽阶段形成含金矿源层;地槽发展阶段,由于多期混合岩化、多期变质分异和侧分泌作用使矿源层中的金矿质富集溶移而在扩容构造中充填和交代形成变质热液型金矿床;地洼发展阶段,由于太平洋板块俯冲挤压而导致古地台构造岩浆活化,在巨厚的前地槽构造层的基底上形成大量的岩浆热液型金矿床和叠加(再造)富化型金矿床。
The author analyses the controlling of geotectonic evolution on the gold deposit mineraliza tion of Northeast Hebei region in this paper according to newer data.The geotectonic evolution pro- cess of the region has undergone four different stages:Pregeosyncline, geosyncline,platform and diwa.conseqently forming different ty- pes of gold deposits.In the pregeosyncline stage,the gold-bearing source bed was formed;In the development stage of geosyncline the po lyphasic granitization polyphasie metamorphic-differentiation and lateral secretion have made the gold in the source bed rich fill the cavities and metasomasis in dilatancy structures,for- ruing metamorphic-hydro-thermal type gold deposits;In the diwa development stage,the subduction and compression of the pacific plate have brought about platform rejuvention both in the geote- ctonics and in the magmatism,forming a number of the magmahydr- othermal and super-posed inrichment type of gold deposits on the base of the buge pregeosyncline tectonic layer.
关键词
矿源层
变质
岩浆
热液
金矿
矿床
source bed
metamorphic-hydrothermal
magmatiehydrothermal
gold deposit
Northeast Hebei
