文献类型：期刊文献

英文题名：Eruption of the Emeishan large igneous province and associated climate change forced intense weathering of Emeishan flood basalts and the formation of overlaying Nb-Zr-Ga-rare earth element and Y polymetallic deposits

作者：Wang, Li Yang, Chenchen Huang, Hu Hou, Mingcai Du, Shengjiang Wen, Hanjie Ling, Kunyue Yin, Runsheng

第一作者：Wang, Li

通信作者：Ling, KY[1];Yin, RS[1];Yin, RS[2]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Crit Mineral Res & Explorat, Guiyang 550081, Peoples R China;[2]Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China;[3]Guizhou Inst Technol, Sch Min Engn, Guiyang 550025, Peoples R China;[4]Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China;[5]Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Crit Mineral Res & Explorat, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Crit Mineral Res & Explorat, Guiyang 550081, Peoples R China;corresponding author), Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China.

年份：2025

外文期刊名：GEOLOGICAL SOCIETY OF AMERICA BULLETIN

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001479927100001)】；

基金：This work was supported by the National Key R&D Program of China (grant 2022YFC2903403) , the Strategic Priority Research Program of the Chinese Academy of Sciences (grant XDA0430103) , and the Hundred Talent Plan through the Chinese Academy of Sciences and the Start-up Fund for High-Level Talents of Guizhou Institute of Technology (grant 2023GCC048) . The associate editor (Jean Bedard) and two reviewers are thanked for providing constructive comments that significantly improved the quality of this work.

语种：英文

摘要：Economically important niobium (Nb), zirconium (Zr), gallium (Ga), and rare earth element deposits (Nb-Zr-Ga-REE polymetallic deposits) are widespread in the Emeishan large igneous province (ELIP), Southwest China. These deposits are hosted in the lower part of the Xuanwei Formation, which consists mainly of lacustrine sedimentary rocks overlain directly on ELIP basalts. While the close temporospatial correlation between these deposits and ELIP basalts has been recognized for a long time, their causal link is poorly understood. We analyzed major and trace elements, Hg concentrations, and Hg isotopic compositions of the lower part of the Xuanwei Formation. At three sites, the samples studied show enrichment in Nb (34.2-500 ppm), Zr (229-4220 ppm), Ga (33.6-138 ppm), and REEs and Y (REY; 123-2670 ppm). Multiple lines of evidence based on major and trace element analysis (e.g., Al2O3/TiO2, Eu/Eu*, Nb/Yb, and REE distribution patterns) support that ELIP basalts are dominant source materials for the lower part of the Xuanwei Formation. High Hg concentrations (up to 335 ppb) and slightly negative to near-zero Delta 199Hg values (-0.19%0 to 0.11%0) were observed in the samples studied, which suggests that ELIPderived Hg entered the lower part of the Xuanwei Formation via atmospheric deposition and weathering of ELIP basalts. This study highlights the crucial role of the ELIP eruption in the metallogeny of the Nb-Zr-GaREY polymetallic layers in the lower part of the Xuanwei Formation and can benefit our understanding of the genesis of supergene polymetallic deposits in large igneous province regions.