摘要
土外山金矿赋存于长英质糜棱岩中,矿体受戈枕脆、韧性叠加剪切带控制,载金矿物为石英和黄铁矿,主要为裂隙金、晶隙金。矿床的成矿物质具有前地槽期、地槽期和地洼期岩石建造的三重组分;成矿作用、成矿阶段具有明显的改造与叠加过程,既有前地槽期、地槽期岩石建造的动力变质分异而导致的演化富集,又有地洼期花岗岩多次侵入而带来的成矿物质的叠加富集。因此,土外山金矿是与剪切带长期演化相关的动力变质分异成矿与岩浆热液成矿相叠加而形成的多因复成矿床。成矿时代主要为中生代印支晚期及燕山期。
The Tuwaishan gold deposit occurs in felsic mylonite. The orebodies are controlled by the Gezhen brittle and ductile superimposed shear zone. The gold-carrying minerals are represented by fissure gold and interstitial gold.The oreforming substances of the deposit involve the components of rock formations in pre-geosynclinal, geosynclinal and geodepressional stages. Mineralization and mineralization stages show distinct reconstitution and superimposition, i.e., there occurred both the evolutional concentration of ore substances resulting from dynamometamorphic differentiation of rock formations in the pre-geosynclinal and geosynclinal stages and the superimpositional concentration of ore substances brought by multiple intrusions of granites of the geodepressional stage. Therefore, the Tuwaishan gold deposit is a polygenetic composite ore deposit formed by superimposition of magmatic hydrothermal mineralization and dynamometamorphic mineralization related to the long-continued evolution of the shear zone. The metallogenic epoch was mainly Late Indosinian and Yanshanian(Mesozoic).
出处
《中国区域地质》
CSCD
1992年第2期174-182,共9页
Regional Geology of China
