摘要
根据对小秦岭地区大地构造位置的最新认识 ,在对一系列野外地质矿产信息综合研究的基础上 ,提出“板内 A型俯冲机制下变质核杂岩内岩浆热穹窿金成矿地质模型”。认为小秦岭地区金矿的矿质来源于华北陆块南缘上地幔 ,成矿介质为下渗的地表水 ,成矿机制是以燕山期花岗岩基熔体为中心的热穹窿所形成的热力系统。热穹窿的成生、演化、消亡过程不仅从时间上决定了矿化发生的有序性及叠加规律 ,并且通过对变质核杂岩构造的改造、利用 ,决定了成矿空间及矿床的分布规律。
According to the recent understandings of the tectonic setting of Xiao Qinling area,it is put forward that the geological model of volcanic thermal dome gold being formed in the metamorphic complex cone under A-type subduction after studying of geology and minerals in this area.It is known that the gold-bearing materials might be from the upper-mantle of North China landmass,ore-forming medium might be surface water of lower seepage,and the mechanism of ore-forming could be the thermal system being formed by thermal dome ,whose center was the melt of Yanshan granite-basement.The formation,evolution and consumption of the thermal dome not only resulted the mineralization sequence and stacked regulation in time,but also formed metallized space and deposit distribution regulation through reforming and utilizing metamorphic complex .
出处
《陕西地质》
2000年第2期16-29,共14页
Geology of Shaanxi
