The Evolution of Two Petrogeno-Mineralization Series and Sr Isotopic Data from Granites in South China

Abstract

Based on a large studies, the granites may be divided into two petrogeno-mineralization series in Southern China. Series I (or Nanling Series) has following sequence of petrogenesis and minerlization: monzonitic granite (or granodiorite)→biotite granite→leucocratic granite→granoporphyry, Q-porphyry→intermediate-basic dikes; REE→Nb Ta (Li Rb Cs) Be Sn W Mo Bi As→Cu Zn Pb→Sb Hg U. Series II (or Yangtz Series): pyroxene diorite (rarely gabbro)→diorite, Q-diorite→granodiorite (Q-monzonite), monzonitic granite→granite→K-feldspar granite→granoporphyry, Q-porphyry (or orthophyry, Q-orthophyry)→intermediate basic dikes; Fe→Cu (Au)→Mo (W)→Zn Pb→Pb (Ag).
The material source for Series I granites was mainly derived from remelting continental crust, but it can not be ruled out that a little amount of mantle-derived material had made contribution to Series I, and that for Series II was primarily connected with deep crust- or upper mantle-derived material, but contamination by small amount of crust material is possible. To bear this knowledge in mind, the following facts are taken into consideration: the geological characteristics, the bulk petrochemical composition, biotite composition, accessory mineral assemblage, trace elements and volatile in whole rock and in accessory mineral, inclusion temperature, content of Ptgroup elements, δEu, δO¹⁸, δS³⁴ and initial Sr (Sr⁸⁷/Sr⁸⁶) ratio. Moreover, these two petrogenetic series correspond to two mineralization series. Each petrogenetic series and each mineralization series are characterized by the inheritance evolution. Consequentely, the concept of series and petrogeno-mineralization model can be suggested.