The Comparasive Study Of Aolunhua Molybdenum-Copper Deposit And Banlashan Molybdenum Deposit In Inner Mongolia

The Aolunhua Mo-Cu deposit and Banlashan Mo deposit in Inner Mongolia, located in the Xilamulun metallogenic belt in the northern margin of North China Craton, are typical porphyry Mo deposits. Through analyzing Geologieal, Orebody, Geochemical, Chronological and the Genesis characteristies of these two deposits, the author carries out comparative research between two deposits, and summarizes their commonness, difference as well as the reasons and contacts.According to the comparative study of Geological and Geochronology characteristics, magmatic activities and mineralization time of the two deposits are almost same, these two deposits are the products of the Early Cretaceous period intermediate-acid magmas.Through the comparative research of orebody characteristics, we consider that Aolunhua Mo-Cu deposit and Banlashan Mo deposit are both bed orebodies, mainly controlled by stratum-lithology and porphyry. The major components in Aolunhua deposit are Molybdenite and chalcopyrite. But the main component in Banlashan deposit is Mo. Their fabrics are different from each other. These two deposits have the typical porphyry deposit hydrothermal alteration and zonation. The alteration of Aolunhua Mo-Cu deposit that is related to mineralization is demonstrated by silicification, K-feldspar, sericitization. Silicification and sericitization are most important alteration. But in banlashan deposit, there are silicification, pyritized phyllite, sericitization, and pyritized phyllite is the most important alteration. Molybdenum mineralization intensity is close to quartz veins.By statistic quartz veins can predict the trends of molybdenum mines.Lithogeochemical analysis shows two deposits have similar characteristics. Plagiogranite porphyry and granodiorite porphyry are both metaluminous high-K calc-alkaline I-type granites, displaying typical adakite. They are rich in Rb、Ba、K、Th、U 、Zr、Hf, Poor in Ta、Nb、Ti. They have weak negative Eu anomaly and intensive REE fractionation. The rhyolite-porphyry of Aolunhua deposit is vein rock, which belongs to peraluminous high-K calc-alkaline A-type granites. But in Banlashan deposit, rhyolite-porphyry is surrounding rock. They characterized by low Sr, high Y and Yb. Trace Elements are in larger difference.Metallogenic materials of these deposits originate from crust sources, mixed with mantle materials. The tectonic settings of the deposit are in the transition period from lithosphere compression to extension. Ore genesis of Aolunhua deposit and Banlashan deposit has similarity and internal relations.