Guangxi Dachang Ore Field 100 With The 105 Orebody Mineralization

Dachang Tin-polymetallic ore field is located in the northwestern part of Guangxi. It is geotectonically in the South China fold belt. Bali-Longtoushan Tin-polymetallic deposit is mainly located at the west area of Longxianggai granite body and was born in the stratum of Devonian series.This thesis is based on predecessors' work, geological investigation, also on a vast amount of geological information, rock and ore samples.From the view of regional geologic environment, using such theories and methods as modern petrology, gitology, geochemistry, mineralogy, isotope geology, metallogenic prognosis etc, and also by means of computer aid dada-processing and simulation mapping and so on, the author emphatically studies the relations between mineralization and strata, structural or magamatites, explains the properties and evolution of the ore field, analyses the origin of minerogenetic matters and fluids, summarizes the origin of the deposit and the regulations of mineralization enrichment, sets up the typified minerogenetic model, points out the favorable regions for prospecting Bali-Longtoushan Tin-polymetallic deposit in this area.On the basis of the study, the analysis and the contrast, the following conclusions are drawn:1. The No. 100 and No. 105 ore body are formed by sedimentary exhalative deposite in the ocean floor, magnetic transformation and organic carbon, and biodctritus are very important.2. The origin of minerogenetic matters come from micaceous granite of Longxianggai.3. No. 100 and No. 105 ore body of Bali-Longtoushan Tin-polymetallic deposit should be a ore body and were controlled by F3 so that No. 105 orebody was moved by F3.The author makes certain that No. 100 and No. 105 ore body of Bali-Longtoushan Tin-polymetallic deposit should be a ore body from everywhere, and sets up and testifies the new viewpoint.