Study On The Characteristics Of The YangMuGou Porphyry Mo Deposit’s Alteration Mineralogy In ZhaShui County

Altered rocks was brought to the attention of the scholars, as is one of the important characteristics of porphyry molybdenum deposits. The physicochemical condition and the hydrothermal fuild of altered rock has important significance in both reasoning the evolution of deoposit and their migration、enrichment、deposition of mineralization elements, and enriching ore forming theory. Meanwhile, altered rocks can be used as one of the important prospecting marks.The this paper takes the YangMuGou-molybdenum deoposit in ZhaShui county Shaanxi province as the research object. Based on the the article study regional geology and mining area geology and collect samples, studies have shown the alteration types and zoning of the YangMuGou-molybdenum deoposit, the environment and mineralization of alteration process on the basis of the data, which is from modern geology analysis method of reflecting microscope、electron probe、rock geochemistry, from what altered minerals and trace element and major element geochemical to prospecting criteria and ore genesis.Studies have shown that the wallrock’s alteration types of the YangMuGou-Mo deoposit mostly comprise silification、K-feldsparizatio、biotitization、serictization、 chloritization、Mudding and propylitization, in which Mo-mineralization closely associated with silification、K-feldsparizatio. Mineralization controlled by the structure significantly, the orebody mainly has concentrated upper and footwall between tectonic alteration zone of f1 and f2, and was in accordance with the occurrence of tectonic belt. The high Si、K of altered minerals show enrichment of Mo are closely related quartz vein. It shows alteration of wall rock in different temperature environment in the process of the hydrothermal intrusion, which out of Cu、Zn、Ni、Co、V、Nb、Sc、Ba and into of Pb、 Ag、Hf、Zr etc. In the diagram of δEu-Sr, thermal fluid of causing the wall rock alteration mainly comes from the crust and seldom comes from the mantle. Negative landform、 quartz vein、mineralization zone of the limonite can be used as direct prospecting criteria on the ground.