Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Genesis of the Dongtangzi Zn-Pb Deposit of the Fengxian-Taibai Ore Cluster in West Qinling, China: Constraints from Rb-Sr and Sm-Nd Geochronology, and In-Situ S-pb Isotopes

Qiaoqing Hu
,
Yitian Wang
* ORCID logo ,
Shaocong Chen
,
Ran Wei
,
Xielu Liu
,
Junchen Liu
,
Ruiting Wang
,
Weihong Gao
,
Changan Wang
,
Minjie Tang
,
Wentang Wu
,
Qiaoqing Hu
Version 1 : Received: 28 December 2023 / Approved: 10 January 2024 / Online: 11 January 2024 (13:05:12 CET)

A peer-reviewed article of this Preprint also exists.

Hu, Q.; Wang, Y.; Chen, S.; Wei, R.; Liu, X.; Liu, J.; Wang, R.; Gao, W.; Wang, C.; Tang, M.; Wu, W. Genesis of the Dongtangzi Zn-Pb Deposit of the Fengxian–Taibai Ore Cluster in West Qinling, China: Constraints from Rb-Sr and Sm-Nd Geochronology, and In Situ S-Pb Isotopes. Minerals 2024, 14, 297. Hu, Q.; Wang, Y.; Chen, S.; Wei, R.; Liu, X.; Liu, J.; Wang, R.; Gao, W.; Wang, C.; Tang, M.; Wu, W. Genesis of the Dongtangzi Zn-Pb Deposit of the Fengxian–Taibai Ore Cluster in West Qinling, China: Constraints from Rb-Sr and Sm-Nd Geochronology, and In Situ S-Pb Isotopes. Minerals 2024, 14, 297.

Abstract

The Dongtangzi large Zn-Pb deposit is located in the southwest of the Fengxian-Taibai (abbr. Fengtai) ore cluster in the west Qinling orogen, whose origin has been controversial, positing diverse genesis mechanisms such as sedimentary-exhalative (SEDEX), sedimentary-reformed, and epigenetic hydrothermal type. In this work, based on detailed observation and systematic study on ore geology, the results of high-precision Rb-Sr isotopic dating on sulfides of the main orebody and Sm–Nd isotopic dating on associated carbonates have been carried out, which yield isochron ages of 211.6 ± 2.6 Ma and 211 ± 4 Ma, respectively. In-situ S-Pb isotopic studies show that the ore related sulfides display a narrow range of δ34S values from 1.1 ‰ to 10.2 ‰, with 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of 18.07 to 18.27, 15.64 to 15.66, and 38.22 to 38.76, respectively. While the pyrite of sedimentary period and the granite porphyry dike have δ34S values vary from 15.8 to 21.4‰, and from 2.1 to 4.3‰ (with 206Pb/204Pb ratios of 18.09 to 18.10, 207Pb/204Pb ratios of 15.59 to 15.61, and 208Pb/204Pb ratios of 38.17 to 38.24) respectively. Combining the regional geology, we propose that the Dongtangzi Zn-Pb deposit is the product of multi-stage epigenetic hydrothermal fluid processes, driven by late Triassic regional tectono-magmatic activities in regional extensional regime, with metallic materials originate from a mixture of Triassic magmatic processes and metamorphic basement.

Keywords

Rb-Sr and Sm-Nd isotopic dating; In-situ S-Pb isotopes; Ore genesis; Zn-Pb deposit; Dongtangzi; West Qinling orogen

Subject

Environmental and Earth Sciences, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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