摘要
本文研究了七宝山金矿的区域及矿区的地质特征,在分析总结野外地质资料的基础上,从矿床地质、矿物岩石的化学成分、稀土元素、矿物流体包裹体、同位素等不同角度阐明了金矿床的地球化学特点,并认为七宝山金矿受古火山机构控制,属于与隐爆角砾岩筒有关的火山热液型金矿床。
The Qibaoshan gold deposit is locatted in thesouthwestern part of the Jiaolai depression, close to the Yishu fault system. Mount Qibao is an ancient volcanic dome and the gold deposit occurs in a cryptoexplosion breccia pipe.The wall rocks of the ore body are subvolcanic rocks which intruded in the Mesozoic. The form of the ore body is elliptic in cross section and pipe-like in vertical section. The rare earth element (REE) distribution patterns of subvolcanic rooks related to gold mineralization are rightward inclining curves, suggesting a marked enrichment of light REE. By means of studying mineral inclusions the formation temperature and other phisico-chemical conditions have been acquired. The δ^(34)S values of sulfide minerals are in the range from 0.3‰ to 5.1‰, with an average of 3.16‰, which are close to those of chondrite. The characteristis of sulfur and lead isotopes show that gold and other ore-forming substances were derived lower crust.The author holds that the Qibaoshan gold deposit is a volcanogenic-hydrothermal deposit related to the explosion breccia pipe.
出处
《地质论评》
CAS
CSCD
北大核心
1991年第4期329-337,共9页
Geological Review
