The Geology,Geochemistry And Prospecting Model Of Qiaoxiahala-aketasi Copper-gold Deposits In Xinjiang

Qiaoxiahala-Aketasi copper-gold mineralization zone is located in Fuyun country of Xinjiang Aletai. The tectonic position is in Siberia and Kazakhstan, two plates of the northern edge of the contact zone,the main body is located in inthe eastern section ofEerqisi copper-polymetallic metallogenic belt.Although much reaserch has been done in therer,the overall work are still low,such as the deposits type genesis and exploration models. Based on the former achievements, I choose three typical copper-golddeposits, Qiaoxiahala, Kekekuduke and Aketasi, for study. This thesis mainly focus on the geological characteristics, metallogenic condition, forming material sources,the mineralization process and prospecting model.The stratum are mainly Middle Devonian beitashan group，the orebody form are showing layer control characteristics, controlled by structure and lithology. The original ore minerals are mainly pyrite, chalcopyrite, magnetite, etc, the alteration in the wall rocks is developed, such as peacock petrochemical, epidotization, chloritization and little silicification,carbonatization. The similar rare earth elements and trace elements patterns suggests that thecurve is relatively flat and LREE enrichment, weak positive anomalies of Eu, negative anomalies of Ce, Showing forming material has the deep source characteristics, The spider diagram showed a moderate right-wing "W" type, it’s relatively enriched in Ba, U, K, Pb, Sr andoss of Nd, Ti and Nd, Ti, which is indicating there are crustal material to join. Hydrogen and oxygen isotope tests have shown that not only magmatic water but also precipitation. The sulfur isotope show that forming materials from the deep earth and the source of sulfur is relatively simple. Multiple episodes of volcanic hydrothermal activity, making the orebody transformed obviously by the late hydrothermal superposition. Through by rock geochemical characteristics, ore-controlling structure and volcanic hydrothermal activity, initially determine the causes of the copper-gold deposit types is stratabound volcanic hydrothermal superimposed transformation type deposits. The geochemical anomalies in elements of the three miningareas show that Au,Cu and As comprehensive exception-based, accompanied of Cr, Ni,Coanomalies,Induced polarization anomalies are low resistivity and high chargeability anomalies; Junction and intersection part of the secondary fracture network structure, undulating and corner o f shear zones, broken extruded place, peacock petrochemical, silicification, chloritization, sericitization alteration development place; quartz veins exposed in places, the place of the geochemical anomalies incombination, these places where geological features are comprehensive displayed have important significance forfurther prospecting.