%0 Journal Article
%T Mineralogy and Garnet Sm每Nd Dating for the Hongshan Skarn Deposit in the Zhongdian Area, SW China
%J Minerals | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/min9040243
%X The Hongshan deposit is one of the largest Cu-polymetallic deposits in the Zhongdian area, southwest China. Two types of Cu每Mo ores, mainly developed in the skarns, have been recognized in the Hongshan deposit, i.e., massive or layered skarn and vein-type, with the former being dominant. The highly andraditic composition of garnet (Adr 100 to Adr 64Gr 32) and diopsidic composition of pyroxene (Di 90Hd 9 to Di 1Hd 99) indicate the layered skarn ores are of magmatic-hydrothermal origin that formed under oxidized conditions. Sm每Nd dating of garnet yield a well-constrained isochron age of 76.48 ㊣ 7.29 Ma (MSWD = 1.2) for the layered skarn ores. This age was consistent with the Re每Os age for the pyrrhotite from the layered skarn ores, and thereby indicated that the layered skarn mineralization was formed in the Late Cretaceous, rather than in the Triassic as was previously thought. The coincidence of the geochronology from the layered skarn ores and vein-type mineralization further indicated that both ores were the result of a single genetic event, rather than multiple events. The recognition of the Late Cretaceous post-collisional porphyry每skarn Cu每Mo每W belt in the Zhongdian area exhibited a promising prospecting potential. View Full-Tex
%U https://www.mdpi.com/2075-163X/9/4/243