摘要
对治岭头金银矿床成矿时代的研究表明,其成矿热液既不可能是与前震旦纪变质围岩有关的变质水,也不可能是与白垩纪火山岩有关的火山热液。氢氧同位素资料及与现代正在活动着的大陆地热系统的对比研究的结果,治岭头金银矿床系在一古地热系统中,经下渗大气降水的加热环流过程形成的,是一浅成热液金银矿床。
It is very important first to know the time relation between an ore deposit and its surround-ing strata and other rocks, before genetic analysis is carried out. There are great debate on the genesis of the Zhilintou Au-Ag deposit, Zhejiang Province. Twomain genetic hypotheses speak for a metamorphic hydrothermal and a volcanic-hydrothermal genesis,respecively. But geologic observations indicate that the Zhilintou Au-Ag deposit was formed in thetime of Trias-Jura, that is, after the unmetamorphic fine-grained granitic veins but before the Creta-ceous volcanic strata, accordingly, its ore-forming fluid had anything to do neither with a probablemetamorphic water related to the Presinian metamorphic host rocks, nor with a hydrothermal solutionderived from the Cretaceous volcanic activity. According to O-H isotopic data and comparison with themodern active geothermal areas, the Zhilintou Au-Ag deposit was formed in a paleogeothermal convec-tion system of heated meteoric water, and could belong to epithermal deposit.
关键词
金矿
银矿
成矿
矿床
成因
time of mineralization
geologic observations
Au-Ag deposit
epithermal
Zhejiang
