GOLD DEPOSITS RELATION TO THE CENOZOIC ALKLINE MAGMATIC PROCESS OVER MID-YUNNAN BASIN
Shen Qiuwei(Yunnan Institute of Geological Sciences)
Mid-Yunnan Basin is a riftogenesis basin developing during Mesosoic-Cenozoic Eras, which is subordinate to the Old Kangdian Continent. A series of red molasze formation were developed during Mesosoic Era. A series of alklic superficial intrusive bodies and volcanic comples were developed along Cenozoic Era. These alklic rocks are mainly distributed over the east side of Ailaoshan Deep Fault. Mid-Yunnan Basin is only a part of the distributing area. There are more than 30 Cenozoic igneous rocks distributing places over the basin. A special type of gold mineralization has been now discovered at some of these places, and an industrial ore deposit has been found out in Laojiezi District, Yaoan County.For the gold deposits in this region, there are three major points interesting economical geologists. First, some new signals of primary gold deposits formed during the Cenozoic Era appearing in our mainland; second, specularite as carrier or bestowing host for the gold) third, alklic rocks being cognate with the gold-bearing fluids. Such problems and the corresponding geological characteristics will be discussed in this paper.
【CateGory Index】： P611.1, P618.5