Rifting cycle and storeyed texture of copper deposits and their geochemical evolution in Kangdian region

摘要

Along with the evolution of the earth crust, in the south of Kangdian Axis the polycyclic lifting occurred: Pt_d-Pt_k, Jinshajiang continental margin sea type aulacogen, Pt_(k_2)Dongchuan-Yimen intercontinental aulacogen, Z Chengjiang postorogenic rift and T_3-E_1 Kangdian continental rift. In these rifts respectively produced Dahongshan-Lala type volcanic-sedimentary-metamorphosed/hydrothermal sedimentary Cu-Fe deposits, Dongchuan-Yimen type, Lanniping type and Dayao-Mouding type sedimentary-reworked copper deposits, which form the storeyed texture whose geochemistry of the trace elements, isotopes of S, Pb, H, O, C, ore-forming fluid and organic matter were regularly evolved with the crust evolution.