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Comparative Study of gacun and youre Silver–Lead–Zinc–Copper Deposits in Sichuan, SW China, and their Mineralization Significance

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 162-182页

作者： DANG Yuan CHEN Maohong FU Bin XUE Zhiqiang School of Earth Science and Resources China University of Geosciences Beijing 100087 China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources CAGS Beijing 100037 China Research School of Earth Sciences The Australian National University Canberra ACT 2601 Australia NO.1 Institute of Geological and Mineral Resources Survey of Henan Luoyang 471000 China

The large gacun silver-lead-zinc-copper deposit in Sichuan Province is one of the largest volcanogenic massive sulfide （VMS） deposits in China. The deposit consists of western and central ore bodies, which form a vein-stockwork mineralization system corresponding to hydrothermal channels, and eastern ore bodies, which form an exhalative chemical sedimentary system derived from a brine pool in a submarine basin. The youre lead-zinc deposit, which is currently under exploration and lies adjacent to the southern part of the gacun deposit, is characterized by intense silicification and vein- stockwork structures and consists of massive silicified rhyolitic volcanics, banded rhyolitic tuff, and phyllitic sericite tuff. From a comparison of their ore-bearing horizons, the gacun and youre deposits have a continuous and stable hanging wall （calcareous slate and overlying andesite） and foot wall （rhyolite-dacite breccia and agglomerate）, and the Uthologic sequence includes lower intermediate to felsic rocks and upper felsic rocks. Thus, the youre deposit, which comprises relatively thinly layered low-grade ore, is regarded as forming a southward extension of the gacun deposit. A further comparison of the structures of the ore-bearing belts between the two deposits suggests that the youre ore bodies are similar to the western ore bodies of the gacun deposit. Moreover, the characteristics of fluid inclusions and stable isotopes in the youre deposit are also similar to those of the western ore bodies of the gacun deposit. Genetic models of the deposits are proposed for the gacun-youre ore district, and massive concealed ore bodies may occcur in the youre deposit at depths that are similar to those of the eastern ore bodies of the gacun deposit.

关键词： ore-bearing horizon structure of ore-bearing belt VMS deposit gacun-youre ore district

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