The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province

LIU Wusheng; ZHAO Hong; ZHAO Ruyi; QIN Jinhua; ZHANG Xiong; JIANG Jinchang; ZHAO Chenhui; LI Tingjie; WANG Chenghui

doi:10.15898/j.cnki.11-2131/td.202107270085

2022 Vol. 41, No. 2

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LIU Wusheng, ZHAO Hong, ZHAO Ruyi, QIN Jinhua, ZHANG Xiong, JIANG Jinchang, ZHAO Chenhui, LI Tingjie, WANG Chenghui. The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province[J]. Rock and Mineral Analysis, 2022, 41(2): 300-313. doi: 10.15898/j.cnki.11-2131/td.202107270085

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LIU Wusheng, ZHAO Hong, ZHAO Ruyi, QIN Jinhua, ZHANG Xiong, JIANG Jinchang, ZHAO Chenhui, LI Tingjie, WANG Chenghui. The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province[J]. Rock and Mineral Analysis, 2022, 41(2): 300-313. doi: 10.15898/j.cnki.11-2131/td.202107270085

The Constraints of Carbonaceous Mudstone Re-Os and Detrital Zircons U-Pb Isotopic Dating on the Diagenetic and Metallogenic Ages from the Dabaoshan Copper Deposit in Guangdong Province

1.
Guangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, China
2.
Institute of Geological Survey, China University of Geosciences (Wuhan), Wuhan 430074, China
3.
National Research Center for Geoanalysis, Beijing 100037, China
4.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 300013, China
5.
Key Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Corresponding author: ZHAO Hong, 15727346463@163.com

Received Date: 24 September 2021

Revised Date: 22 November 2021

Accepted Date: 27 January 2022

Publish Date: 28 March 2022

Abstract

Abstract

BACKGROUND
With the development of high-precision negative thermal ionization mass spectrometry (N-TIMS) technology, Re-Os isotopic dating of carbonaceous mudstone is more and more widely used in the determination of sedimentary age. The controversy over the diagenetic and metallogenic ages of the Dabaoshan copper deposit in Guangdong Province has always been a key restricting the study of the genetic mechanism.
OBJECTIVES
To constrain the diagenetic and metallogenic ages of the Dabaoshan copper deposit.
METHODS
Re-Os isotope ratios were determined by high precision N-TIMS after dissolving carbonaceous mudstone powder by reverse aqua regia in the Carius tube. Zircon U-Pb age was determined by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS).
RESULTS
(1) The contents of Re and Os ranged from 0.976×10^-9 to 2.997×10^-9 and 0.067×10^-9 to 0.115×10^-9, respectively. The ¹⁸⁷Re/¹⁸⁸Os ratio varied from 78.236 to 154.799, and the ¹⁸⁷Os/¹⁸⁸Os ratio varied from 1.642 to 1.885. The Re-Os isotopic isochron age of black carbonaceous mudstone was 195±28Ma (n=6, MSWD=17). (2) The ²⁰⁶Pb/²³⁸U age ranged from 2631 to 236Ma, including two Mesozoic zircons, accounting for 2.50% of the total zircons, 19 Paleozoic zircons, accounting for 23.8% of the total zircons, 58 proterozoic zircons, accounting for 73% of the total zircons, 1 Archean zircon, accounting for 1% of the total zircons. The results of detrital zircon U-Pb age were broad and developed multiple peak periods, among which the youngest source magmatic zircon was formed in the Indosinian period.
CONCLUSIONS
The diagenetic and metallogenic age of the Dabaoshan copper deposit in Guangdong Province was constrained to the early Yanshanian. The distribution characteristics of detrital zircon U-Pb age further indicate that the Lower Jurassic Jinji Formation was formed at the stable continental margin, and its detrital material comes mainly from the ancient continental basement.
- negative ion thermal ionization mass spectrometry /
- LA-ICP-MS /
- carbonaceous mudstone /
- Re-Os isotope /
- detrital zircon /
- U-Pb isotope /
- Dabaoshan copper deposit /
- metallogenic age

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References

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