~(40)Ar/~(39)Ar Dating of Muscovite from Greisenized Granite and Geological Significance in Limu Tin Deposit

Abstract

The Limu Sn-Nb-Ta deposit located in north Guangxi,South China,is composed of Laohutou,Shuiximiao and Jinzhuyuan orebodies.The Laohutou orebodies host in the greisenized granite,and the tin mineralization are closely related to greisenization hydrothermal activity.Muscovite 40Ar/39Ar dating is analyzed from greisenized granite at Laohutou orebodies and its plateau age and isochron age are 214.1±1.9 Ma and 214.2±2.2 Ma,respectively.It is suggested that the tin mineralization occur at 214 Ma at Louhutou and form in extensional environment under post-collision geodynamic setting.