Geochemical Exploration Model Of Tin Deposits In Southern Hunan Province, China

The southern area of Hu Nan is an important part of the Nanling metallogenic belt, which is famous for the non-ferrous metal ores, and it is with great prospecting potential. Hunan Chenzhou Bai Lashui Super large tin deposit, Shi Zhuyuan tungsten-tin polymetallic deposit and Hong Qiling tin polymetallic deposit are the three representatives in the region. This article has collected geological data and data of regional rocks, altered rocks and ores, regional stream sediment geochemical, large scale sediment geochemical of three typical deposits in the studied area, Through studying the geology and geochemical anomaly of the three typical deposits,this article has established geochemical exploration model of tin deposits in south Hu Nan.For the tin ore-concentrated area in southern Hunan, the rock indicator element combination of the geochemical explorative prospecting includes thirteen elements(W,Sn,Mo,Bi,Pb,Zn,Cd,Ag,Be,Nb,Th,U,Y).Generally speaking, the anomaly intensity of the main mineralizing element(Sn) is greater than 5. The anomaly intensity of the associated elements(Mo) is greater than 4. The anomaly intensity of the associated elements(W,Bi,Be) is greater than 3. The anomaly intensity of the associated elements(U,Y)is greater than 2. The anomaly intensity of the associated element( Pb,Zn,Cd,Ag,Th) is greater than 1,The intensity of the element is 1.For the tin ore-concentrated area in southern Hunan, the geochemical reconnaissance element combination of the geochemical exploration includes fourteen elements(W,Sn,Mo, Bi,Cu,Pb,Zn,Au,Ag,As,Sb,Hg,F,Co).Generally speaking, the anomaly intensity of the main mineralizing element(Sn) is greater than 5. The anomaly intensity of the associated elements(W,Cu,Pb,Zn,Ag,As) is greater than 5. The anomaly intensity of the associated elements(Mo,Bi) is greater than 4. The anomaly intensity of the associated elements(Au,Sb,F)is greater than 3. The anomaly intensity of the associated element(Co) is greater than 2, The anomaly intensity of the associated element(Hg) is greater than 1.For the tin ore-concentrated area in southern Hunan, the regional geochemical indicator element combination of the geochemical exploration includes fifteen elements(W,Sn,Bi,Cu, Pb,Zn,Cd,Ag,As,Sb,F,Be,Th,U,Y).Generally speaking, the anomaly intensity of the main mineralizing element(Sn) is greater than 5. The anomaly intensity of the associated elements(Pb) is greater than 5. The anomaly intensity of the associated elements(W,Bi,Cd,Ag,As) is greater than 4. The anomaly intensity of the associated elements(Cu,Be)is greater than 3. The anomaly intensity of the associated element(Zn,Sb) is greater than 2, The anomaly intensity of the associated element(F,Th,U,Y) is greater than 1.In the tin ore-concentration area of the southern Hunan, the enrichment characteristics of the elements(W,Sn,Bi,Pb,Zn,Cd,Ag,Be,Th,U,Y) show the good succession in the geochemical process from the bed rocks to the stream sediments. However, due to the weathering, leaching influence and the enrichment effect, the anomaly intensity of these elements shows the variability to some extent, that is to say, the anomaly intensity tends to weaken or strengthen.In summary, the prospecting indicator element combination of the tin ore concentration area is a total of 11 elements, namely, W,Sn,Bi,Pb,Zn,Cd,Ag,Be,Th,U,Y.