Abstract:

The Dongan gold deposit occurs mainly in metasomatic-quartzite inter-out zone contacted with the late middle Yanshanian period latent rhyolite and the late Indo-chinese epoch alka lifeldspar granite. Them inority occurs inmetasomatic-quartzite zone contacted with the dacite (that is in lower Cretaceous system Guanghua group) and ryolite. The ore-body is in control of SN extension fault strictly. Ore-form ing fluids of mixed hydrothermal solution came from the late middle Yanshanian period latent rhyo lite. Ore-forming material came from latent rhyolite, and extract from crystal line basement that is upper Proterozoic Erathem Yimianpo group epizonalme tamorphism intermed iate acidity volcano-fine grained fragmental rock and wallrock, the late middle Yanshanian period fine grained granite, the late Indo-chinese epochalkali-feldspar granite.

Key words: Ore-controled facer, Source of ore-forming