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SHRIMP U-Pb dating of the Furong unit of Qitangling granite from southeast Hunan province and their geological implications.
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2006
Year
Metamorphic ZirconEngineeringSoutheast Hunan ProvinceEast Asian StudiesQitianling Granitic StockPrecambrian GeologyTectonic EvolutionEarth ScienceFurong GraniteLanguage StudiesGeochronologyGreenstone BeltEast Asian LanguagesGeologyShrimp U-pb DatingCratonTectonicsFurong UnitPetrology
The Qitianling granitic stock is located in the southeast Hunan Province,South China.Recently,a giant tin deposit,the Furong,has been found in the southern part of the granite.This granite stock can be divided into three units:the Cailing,Furong and Huangtangling granites.Detailed SHRIMP U-Pb geochronology of zircons from the Furong granite is reported in this paper,which yield ~(206)Pb/~(238)U ages of 155.5±1.3 Ma (MSWD=1.7) and 157.1±1.2 Ma (MSWD=1.7),respectively.This age is consistent with that of the Cailing granites (159～160 Ma),suggesting both of them were emplaced at the same time.Inherited zircon cores yield Paleo- and Meso-Proterozoie ages of 2445±29 Ma and 1708±23 Ma,indicating the presence of Paleo- to Meso-Proterozoic component in the deep crust of this region.An inherited metamorphic zircon was found which yields an age of 907±4.8 Ma,which is consistent with the age of collision between Yangtze Block and Cathaysia Block.These data further support that the high e_(Nd) (t) and low T_(DM) Shi-Hang belt in South China may have originated from a collision zone during Neoproterozoic time between Yangtze and Cathaysia blocks.