中国不同时代主要类型铜矿床硫同位素特征及其成因意义OA北大核心CSTPCD

Objectives:Sulfur isotopes are an important means to trace the source of mineralizing materials in mineral deposits,and they are also of reference significance for revealing the material cycle of sulfur. Methods:In this paper,we select 8 large and super-large copper deposits of different types,time and space in China,and systematically collect and organize 1415 sulfur isotope data. Results:① Spatially,the sulfur isotope compositions of skarn-type,porphyry copper deposits and VMS copper deposits show a pattern of'top heavy and bottom light'and'center light,edge heavy'.② Temporally,the δ34S value of different ore types gradually increase from the early stage to the late stage of mineralization in the deposit scale.At the national scale,the 834S values of chalcopyrite in different types of copper ores gradually decrease from early to late,which is contrary to the variation pattern at the deposit scale.③ Indications for mineral exploration,the δ34S values of sulfide within the rich-ore bodies in the Jiama and Dabaoshan deposit are relatively positive,and the δ34S values of the pyrites near the mineralization center in the Ashele deposit are more negative,in addition,the δ34S values of co-rich pyrites in the early stage of the Hubi-type copper deposit are higher than theδ34S values of co-poor pyrites in the late stage. Conclusions:Expect for the Neoarchean Hongtoushan copper deposit,the δ34S values of chalcopyrite in different types of copper deposits significantly decrease from the Proterozoic to the Paleozoic to the Mesozoic and then to the Cenozoic,which is related to the evolution of the Earth.