TY - JOUR
T1 - Fingerprinting Pb-Zn mineralization events in the SW Yangtze Block, South China
T2 - A case from Yuanbaoshan deposit
AU - Yu, Liming
AU - Zou, Hao
AU - Li, Min
AU - Pirajno, Franco
AU - Cao, Huawen
AU - Xiao, Bin
AU - Yu, Huidong
AU - Wu, Jianghan
AU - Shen, Jinxiang
AU - Liu, Xinyu
AU - Chen, Xinwei
AU - Hou, Mingcai
N1 - Funding Information:
We greatly appreciate the constructive comments from the Editor-in-Chief Prof. Huayong Chen, guest editor Thomas Ulrich and two anonymous reviewers. We would like to thank Professor Zhanzhang Xu and Associate Professor Yi Fang for their help in the field. This study was supported by the Department of Natural Resources of Sichuan Province [grant number KJ-2023-011], National Natural Science Foundation of China [grant number 42272129 ], Sichuan Science and Technology Program [grant number 23NSFJQ0162 ], and the Everest Scientific Research Program of Chengdu University of Technology .
Publisher Copyright:
© 2024 The Authors
PY - 2024/2
Y1 - 2024/2
N2 - The southwestern Yangtze Block represents one of the world's largest lead–zinc provinces, comprises more than 400 known carbonate-hosted Pb-Zn deposits and contains over 30 million tons (Mt) of total Pb + Zn reserves. The Pb-Zn deposits in this area have been studied extensively by economic geologists, but the origin and mineralization processes of these deposits are still controversial. The Yuanbaoshan deposit is a typical carbonate-hosted Pb-Zn deposit of medium scale (0.19 Mt P + Zn reserves @ 0.7–26.31 wt%), which is in the northern part of the Pb-Zn mineral belt in the southwest margin of the Yangtze Block. In this study, we have conducted LA-ICP-MS sulfides trace elements, S isotope analyses, together with gangue carbonate C-O stable isotope analyses and pyrite Rb-Sr dating. We present Rb-Sr isotopic data on the pyrite that yields an isochron age of 196.4 ± 2.3 Ma. The mineralization temperature at Yuanbaoshan, as determined by the Ga, Ge, In, Mn and Fe (GGIMF) in sphalerite geothermometer, ranges from 161 to 264 ℃ (Sp1) and 141 to 246 ℃ (Sp2). The δ13CPDB values range from −0.66 to 0.61 ‰, δ18OSMOW values range from 15.6 to 17.3 ‰. In situ S isotopes show that the δ34S values of sulfides range from −1.4 to 17.73 ‰. The field, petrologic, geochemical and isotopic data from our study lead to the following salient findings. (1) The dissolved carbon and oxygen of ore forming-fluids of these Pb-Zn deposits were mainly derived from sedimentary carbonate dissolution. (2) The reduced S in the sulfide of the Yuanbaoshan Pb-Zn deposit is mainly derived from the thermochemical sulfate reduction (TRS) and the reduced S produced by the pyrolysis of S-containing organic matter in the carbonaceous mudstone of the Ebian Group. (3) The large-scale Pb-Zn mineralization in the southwest margin of the Yangtze Block was influenced by the post-collision extension between the Indosinian Block and the South China Block during ca. 200 Ma.
AB - The southwestern Yangtze Block represents one of the world's largest lead–zinc provinces, comprises more than 400 known carbonate-hosted Pb-Zn deposits and contains over 30 million tons (Mt) of total Pb + Zn reserves. The Pb-Zn deposits in this area have been studied extensively by economic geologists, but the origin and mineralization processes of these deposits are still controversial. The Yuanbaoshan deposit is a typical carbonate-hosted Pb-Zn deposit of medium scale (0.19 Mt P + Zn reserves @ 0.7–26.31 wt%), which is in the northern part of the Pb-Zn mineral belt in the southwest margin of the Yangtze Block. In this study, we have conducted LA-ICP-MS sulfides trace elements, S isotope analyses, together with gangue carbonate C-O stable isotope analyses and pyrite Rb-Sr dating. We present Rb-Sr isotopic data on the pyrite that yields an isochron age of 196.4 ± 2.3 Ma. The mineralization temperature at Yuanbaoshan, as determined by the Ga, Ge, In, Mn and Fe (GGIMF) in sphalerite geothermometer, ranges from 161 to 264 ℃ (Sp1) and 141 to 246 ℃ (Sp2). The δ13CPDB values range from −0.66 to 0.61 ‰, δ18OSMOW values range from 15.6 to 17.3 ‰. In situ S isotopes show that the δ34S values of sulfides range from −1.4 to 17.73 ‰. The field, petrologic, geochemical and isotopic data from our study lead to the following salient findings. (1) The dissolved carbon and oxygen of ore forming-fluids of these Pb-Zn deposits were mainly derived from sedimentary carbonate dissolution. (2) The reduced S in the sulfide of the Yuanbaoshan Pb-Zn deposit is mainly derived from the thermochemical sulfate reduction (TRS) and the reduced S produced by the pyrolysis of S-containing organic matter in the carbonaceous mudstone of the Ebian Group. (3) The large-scale Pb-Zn mineralization in the southwest margin of the Yangtze Block was influenced by the post-collision extension between the Indosinian Block and the South China Block during ca. 200 Ma.
KW - C-O isotope
KW - Carbonate-hosted
KW - In situ trace elements and S isotopes
KW - Rb-Sr dating
KW - Yuanbaoshan Pb-Zn deposit
UR - http://www.scopus.com/inward/record.url?scp=85185005224&partnerID=8YFLogxK
U2 - 10.1016/j.oregeorev.2024.105878
DO - 10.1016/j.oregeorev.2024.105878
M3 - Article
AN - SCOPUS:85185005224
SN - 0169-1368
VL - 165
JO - Ore Geology Reviews
JF - Ore Geology Reviews
M1 - 105878
ER -