The progress in the study of Cu-Au(Mo) deposits related to alkaline rocks
WANG Fengxiang;PEI Rongfu;JIANG Sihong;QIU Huiyuan;LIU Yifei;ZHAO Yuanyi;Institute of Mineral Resources,CAGS;School of Earth Science and Resources,China University of Geosciences;Hebei University of Geosciences;
Cu-Au(Mo) deposits related to alkaline rocks have attracted more and more attention throughout the world, because more than 20% of the world-class Au-Cu(Mo) deposits are associated with shoshonitic and alkaline rocks. Although they include most of the usual types of Au-Cu(Mo) deposits such as porphyry type and gold-rich epithermal deposits, they share the same characteristics of mineralization and alteration on the whole. As a group, these deposits are characterized by Te-rich mineralization, abundant K metasomatism and minerals such as fluorite and roscoelite. Most of these unique mineralization characteristics may be attributed to the evolution of composition of ore-related alkaline magmas, and the fluids were under the condition of CO_2-richness, relative oxidation and low sulfidation. Most Cu-Au(Mo) deposits developed in alkaline provinces in a stretching environment also constitute exploration targets in and around alkaline igneous centers. The perspectives of Cu-Au(Mo) deposits related to alkaline rocks in China are tremendous. To better find new deposits of this type, researchers should pay more attention to petrogenesis and their relation to Cu-Au mineralization.