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7461428 
Journal Article 
[New type of tin mineralization related to granite in South China: Evidence from mineral chemistry, element and isotope geochemistry] 
Jiang, SY; Zhao, KD; Jiang, YH; Ling, HF; Ni, P 
2006 
Yes 
Yanshi Xuebao / Acta Petrologica Sinica
ISSN: 1000-0569 
22 
10 
2509-2516 
Chinese 
WOS:000242107500011 
South China is the most important Sn metallogenic province and there are many large and super-large granite-related tin deposits. Recently a giant tin deposit, the Furong, has been found in the southern Hunan province. Tin mineralized bodies mainly occur in the fault zones and alteration zones of the Qitianling granites, which genetically related to chlorite alteration. The Qitianling granites contain hornblende and have high oxygen fugacity, and are metaluminous. Elemental and isotopic geochemistry suggests that the granites were produced by the mixing of the mantle-derived mafic magma and the crust-derived felsic magma. Therefore, the Qitianling granites are distinctly different from common S-type tin granites and are more similar to A-type granites. Isotope dating results indicate that the age of main stage tin mineralization is 20Ma later than the emplacement of the Qitianling granites. H-O isotope data indicate a dominant influence of meteoric water associated with chlorite alteration. The sulfur isotope data suggest both the granite and the sedimentary strata provided the sulfur for mineralization. Fractional crystallization of the magma and tin deposition directly from exsolved magmatic-hydrothermal fluids may not be the major mechanism for the tin mineralization in the Furong deposit. Instead, we suggested that tin mineralization may be related with the post-emplacement chloritization of the Qitianling granites. Sn-rich mafic minerals (amphibole, biotite, titanite) released tin and other metals (e. g. Ti) into the hydrothermal fluids when these minerals were altered to chlorites. Then cassiterite and rutile precipitated together with chlorite when the physical and chemical condition of the Sn- and Ti-rich fluids changed. It is a very special model for granite-related tin mineralization. This study provides a new insight into granite-related Sn metallogenesis in South China. 
Furong tin deposit; Qitianling granites; chloritization; South China