Metallogenic Modle Of The Cretacous Porphyry Mo Deposits In East Oinling Molybdenum Belt

After the Climax-Henderson Mo belt in Colorado mineralization belt in U.S.A., the East Qinling Mo belt (EQMB) is the largest Mo producer in China. Molybdenum deposits in the EQMB include porphyry Mo, porphyry Cu-Mo, skarn Mo-W, and carbonatite deposits. The four porphyry deposits-Jinduicheng, Yuchiling, Leimengou, and Donggou-bear a striking similarity in mineralization, hydrothermal alteration, and igneous geochemistry. By comparing with the Climax-type deposits, the four porphyry Mo deposits in the EQMB share great sililarities with Climax-type especially Sub-Climax-type deposits in tectonic background, magmatic activity, and hydrotheral alteration, so we propose that the four deposits are the Cretacous porphyry Mo deposits. The studies of the four deposits relating granite stocks and batholiths in geochemistry, mineralization age, REE patterns, and Sr isotope, show that may have resulted from magmas of similar primary source region that experienced progressively greater degrees of crustal interaction and magma fractionation during ascent, as post-orogenic extension of the Qinling Mountains progressed eastward. Based on previous research and characteristics in mineralization, hydrothermal alteration, and ore-forming fluid, this study suggests a new metallogenic model for the four Cretacous porphyry Mo deposits in the EQMB.