Genesis of the Chalcopyritebearing Silicalite in the Tongyugou Copper Ore
District, Qinghai Province and Its Geological Prospecting Significance

Abstract

Abstract: The Tongyugou area, located in the conjunction between the East Kunlun and West Qinlin orogenic belts, is one of the most important copper deposits in the Ela mountain metallogenic belt. Further resource prospecting at the area faces great challenges, and the silicalite might be one of the clues. The silicalite in the Tongyugou copper ore district occurs as bedding and banded structure, and is mainly hosted in conformity within LowerMiddle Triassic rocks. It is mainly made up of microfine crystalline quartz grain with less sericite, chalcopyrite and pyrrhotine, however, no biological related texture has been observed. The Al2O3TiO2 and FeMn(Cu+Ni+Co)×10, P2O5Y diagrams and SiO isotope signature suggests that the silicalite was formed by hydrothermal sedimentary processes. Its Si/Al and U/Th values and rare earth element geochemical characteristics also imply that the hydrothermal sedimentary system has been affected by some terrigenous material. Based on the examination in Al2O3/(Al2O3+Fe2O3)Fe2O3/TiO2, Ti/VV/Y and (La/Ce)NAl2O3/(Al2O3+Fe2O3) discrimination diagrams, the silicalite is proved to be formed at continental margin setting. Accompanying with the northward subduction of the Anyemaqen ocean in the EarlyMiddle Triassic, the Tongyugou area appears to be a backarc basin. In the basin, exhalative sedimentation occurred and also resulted in a lot of oreforming minerals to form protore beds. The silicalite is an important recorder to preserve the information of the mineralization event. Also, this study suggests that the Cuozama and Tadong may be important targets for the exploration of VMS type deposits.

Key words: silicalite, hydrothermal sedimentation, Tongyugou copper deposit, EarlyMiddle Triassic, Elashan metallogenic belt, Qinghai

CLC Number:

LUO Fan，XUE Chunji，ZHAO Xiaobo，HUANG Yongsen，WANG Xiongfei， DAI Zhijie，WU. Genesis of the Chalcopyritebearing Silicalite in the Tongyugou Copper Ore District, Qinghai Province and Its Geological Prospecting Significance[J]. Geoscience.

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Genesis of the Chalcopyritebearing Silicalite in the Tongyugou Copper Ore District, Qinghai Province and Its Geological Prospecting Significance

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