Analysis On Metallogenic Conditions Of Skarn - Type Tungsten - Tin Polymetallic Deposit In The Southwest Of Wubaoshan Granite Body In Southeastern Yunnan Province

The study area is located in southwest side of Bo zhushan dome structure of wenshan-funing fold bundle of The Southeast Yunnan fold belt. This work is based on the former basic geology study and prospecting research of Bo Zhushan area. By the analysis of ore deposit geological characteristic of ore bodies, the ore-forming parent rock and ore formation lithology and tectonic ore-controlling factors such as comprehensive analysis and research, The mineralization enrichment regularity was found out and the matallogenic model was established.At last,the prospecting target area can be circled in the favourable areas for deposition.(1)The findings suggest that the deposits are mainly skarn-type tungsten-tin polymetallic deposit through the research of regional-forming geological background,ore deposit geological characteristics,ore body characteristics, metallogenic material source and ore structure and other aspects of comprehensive analysis.(2)The granite magma invade the intersection of northeast anticline and northwest fault and have two-phase activity characteristics. These intrusive granite body have7units and there are5outcrops in our study area. The granite magma is the parent rock and have provided most of material and hot resource. The Cambrian and Devonian stratum which contain a little metallic elements that can get off from the stratum provided some of the deposit material to the deposit. The mainly containing deposit rocks are carbonate rocks. The main ore structure is the contact zone of intrusive magama and carbonater rocks. Wall rock alteration is strong in the region and the alteration zone is distinct. The grossular-diopside-tremolite alternation zone is the most advantage zone of mineralization for W-Sn metallic deposit.Magma invasion in Cambrian system and carbonate metasomatism in the process of forming tungsten tin, tungsten ore. Farther from the rock mass in carbonate rock fracture zone ore granitic magma emplacement process between the cracks formed in the lead and zinc. Due to the hot magma activity drivers, ore-forming fluid along the channel to the shallow migration,such as fracture when mixed with atmospheric precipitation, with lower temperature,ore fluid near the fracture and enrichment of the Devonian system of sandstone in the formation of iron ore.(3) Based on ore-controlling geological conditions and the analysis of the mineralization enrichment regularity, metallegenic model is established,and summarizes the main prospecting geological sign,and combined with geophysical-geochemical anomaly in the area, in the study area delineated the three prospecting target areas.