大厂锡矿田海底热水沉积,后期岩浆热液叠加改造成矿的依据

通过矿田一些地质地球化学等成因依据的研究和长坡矿热水喷口的发现,提出区域地球化学场的存在,中元古界—下古生界原始矿源层的形成,泥盆纪海底火山—热水成矿作用、华力西—印支期大广地区石油的形成—迁移—聚积过程形成富含金属成矿物质的油气田,燕山期岩浆热液叠加改造成矿作用以及燕山期构造—岩浆作用破坏富含金属成矿物质的油气田而成矿等—系列地质作用在大厂地区地质历史上有机组合,形成大厂超大型矿床,而泥盆纪火山及海底热水作用、燕山期构造—岩浆作用则是主导成矿作用.

THE BASIS OF SUBMARINE HYDROTHERMAL DEPOSITION AND LATER MAGMATIC HYDROTHERMAL SUPERIMPOSED-REENRICHED MINERALIZATION IN DACHANG ORE FIELD,GUANGXI

Based on the discovery of the hotwater vent in Changpo ore deposit and the study of geological and geochemical characteristics of Dachang ore field, it is considered that the genesis of Dachang tin-polymetallic ore deposit is related to the formation of middle Proterozoic-lower Palaeozoic proto-source bed, to the mineralization of Devonian submarine volcanic and hot water, the metallogenetic elements enrichment-migration and accumulation in Varisian-Indosinian Period hot brine in oil field and to the superimposed reenriched mineralization in Yanshan Period magma hydrothermal and to the destruction of Yanshanian tectonic-magmatism to metallogenic material enriched in oil gas field and a series of other geological processes happened in Dachang area in geological history,the combination of which made the forming of this super-large scale Dachang ore deposit. The mineralization of Devonian hot water and the superimposed-reenriched mineralization in Yanshan period tectonic-magmatism are principal mineralization process.