New insights into the source of gold in the Youjiang basin, SW China |
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Mantle plume rich in gold is considered to be important for the formation of giant epigenetic gold deposits. The Youjiang ba-sin, SW China, is the world's second largest Carlin-type gold province, but the ultimate source of its gold remains enigmatic. In this study, we report that the Middle-Late Permian basaltic rocks in the basin are rich in native gold grains. These gold grains are scattered in the interstices of pyrite and mar-casite and in the amorphous silica cavities. Mineralogy and S-Pb isotope geochemistry of the auriferous sulfides suggest that the gold was largely derived from the gold-rich Late Permian (ca. 260 Ma) Emeishan plume and was released to a near-surface volcanogenic massive sulfide (VMS) metallogenic system, where it accumulated. The native gold grains from the basalts may have been inherited by the younger (ca. 140 Ma) Carlin-type ores in the Youjiang basin, which are indicative of gold pre-enrichment in the basin. Our study highlights that golden plume upwelling could carry abundant gold into the upper crust, even into shallow-level metallogenic systems, and thus provides an alternative view on the source of gold in the Youjiang basin.
Publication name |
Geological Society Of America Bulletin, Volume 135, Issue 3-4, Page 955-966, DOI 10.1130/B36520.1, Published MAR 1 2023 |
Author(s) |
Chen, Jun; Du, Li-Juan; Yang, Rui-Dong; Zhou, Mei-Fu; Lai, Chun-Kit; Huang, Zhi-Long |
Corresponding author(s) |
Huang, Zhi-Long huangzhilong@vip.gyig.ac.cn Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China |
Author(s) from IGCAS |
Huang, Zhi-Long; Zhou, Mei-Fu | View here for the details
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