摘要
使用微量元素、同位素和矿物包裹体等方法对湘西西安白钨矿矿床进行了较详细的地球化学研究。认为该矿床属于沉积-改造型层控矿床,并阐述了矿床的矿源层、成矿时代、成矿条件及控矿因素等问题。
Detailed geochemical studies of the Xi 'an tungsten ore deposit in west Hunan have been conducted with a diversity of geochemical approaches. As deduced from analyses of more than twenty kinds of trace elements and isotopie characteristics of C, 0 and Pb, the Banxi Group slate of great thickness is the source bed of the deposit. H and 0 isotopie compositions of water isolated from fluid inclusions show that the water in ore-forming hydrothermal solutions was derived mainly from heated formation water. Various phy-sico-chemical parameters for the hydrothermal solution have also been obtained from fluid inclusion studies.As deduced from Pb isotopic model age and whole-rock K-Ar age, the age of ore formation falls within the range of 500-600 Ma, suggesting that the Caledonian move-ment is a tectonic movement which had the greatest influence on the studied region. The principal ore-controlling factors are: stratum (source bed), lithologic character (carbo-nate host rock), and tectonics (Caledonian tectonic movement). The available evidence suggests that this deposit is a sedimentary-reworked strata-bound deposit.
出处
《地球化学》
CAS
1986年第2期183-192,共10页
Geochimica
