Regional Exploration Targeting Model for Gangdese Porphyry Copper Deposits
Tóm tắt
An exploration targeting model for Gangdese porphyry copper deposit in Tibet, China, is constructed based on (i) the age of porphyry intrusions within Gangdese magmatic arc; (ii) the regional‐scale normal E–W, N–S and N–E striking faults; and (iii) comprehensive anomalously high concentrations of Cu‐Mo‐Au‐Ag‐Pb‐Zn. These targeting elements are derived from geological map and geochemical dataset, and are integrated by weights of evidence with the aid of geographic information system (GIS). The resulting prospectivity for porphyry copper deposits delineated by posterior probability demonstrates that the target areas extend along the Yaluzangbujiang River and contain the two large deposits, Qulong and Chongjiang, located in the eastern and central part of the Gangdese belt, respectively. These results indicate that the proposed exploration targeting model is a potential tool to map regional‐scale mineral prospectivity. The target areas with high values of favorability, especially where high concentrations of Cu‐Mo‐Au‐Ag‐Pb‐Zn are present, are the potential areas for finding undiscovered porphyry copper deposits.
Từ khóa
Tài liệu tham khảo
Agterberg F. P.(1989)Systematic approach to dealing with uncertainty of geoscience information in mineral exploration. Proceedings of the 21st APCOM Symposium Las Vegas USA Chapter 18 p. 165–178.
Bonham‐Carter G. F., 1994, Geographic information systems for geoscientists: modeling with GIS, 398
Gao S., 2005, Study on the Geochemical characteristics and Metallogenic mechanism of Gangdise Porphyry Copper Deposits in Tibet
Hou Z., 2001, Gangdese porphyry copper belt the second “yulong” copper belt, China Geol., 28, 27
Hou Z., 2003, Adakite: a significant Cubearing porphyry‐a case study on porphyry Cu deposits in Tibet and northern Chile, Miner. Deposits, 22, 1
Hou Z., 2003, Re–Os age for molybdenite from the Gangdese porphyry copper belt on Tibetan plateau: implication for geodynamic setting and duration of the Cu mineralization., Sci. China, 33, 509
Li G., 2004, Diagenetic and mineralization ages for the porphyry copper deposits in the gangdise metallogenic belt, southern Xizang, Geotectonica et Metallogenia, 28, 165
Lord D., 2001, Measuring exploration success: an alternative to the discovery‐cost‐per‐ounce method of quantifying exploration effectiveness, SEG Newsl., 45, 10
Qu X., 2001, Is Gangdese porphyry copper belt the second “yulong” copper belt?, Miner. Deposits, 20, 355
Qu X., 2003, 40Ar/39Ar ages of porphyries from the Gangdese porphyry Cu belt in south Tibet and implication to geodynamic setting, Acta Geol. Sin., 77, 245
Rui Z., 2003, Metallogenic epoch of Gangdese porphyry copper belt and uplift of Qinghai‐Tibetan Plateau, Miner. Deposits, 22, 224
Rui Z., 2004, The response of porphyry copper deposits to important geological events in Xizang (Tibet), Earth Sci. Front., 11, 145
Sillitoe R. H.(1993)Gold‐rich porphyry copper deposits: geological model and exploration implication. Mineral Deposit Modeling Geological Association of Canada Special Paper 40 465–478.
Zheng Y., 2004, Finding, characteristics and significances of Qulong superlarge porphyry copper (molybdenum) deposit, Tibet, Earth Sci. J. China Univ. Geosci., 29, 103
Zheng Y., 2004, Finding and significances of Chongjiang porphyry copper (molybdenum, aurum) deposit, Tibet, Earth Sci. J. China Univ. Geosci., 29, 333
Zheng Y., 2006, The discovery of Zhunuo porphyry copper deposit in Tibet and its significance, Earth Sci. Front., 13, 233
Zuo R., 2007, Synthetic information prediction of porphyry copper in Tibet, Cent. South Univ. Technol., 38, 368