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

Rock and Mineral Analysis > 2022 > 41(2): 300-313. > DOI: 10.15898/j.cnki.11-2131/td.202107270085

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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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

Received Date: September 23, 2021
Revised Date: November 21, 2021
Accepted Date: January 26, 2022
Published Date: March 27, 2022

Abstract

HIGHLIGHTS
(1) Re-Os isotopic age of carbonaceous mudstone was obtained by negative thermal ionization mass spectrometry (N-TIMS).

(2) Depositional age, tectonic setting, and source were constrained by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) for detrital zircon U-Pb ages.

(3) Re-Os isochron age of the Jurassic carbonaceous mudstone and zircon U-Pb age of the quartz sandstone constrained the diagenetic and metallogenic age of the Dabaoshan copper deposit to be the early Yanshanian.

ABSTRACT

BACKGROUNDWith 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.
OBJECTIVESTo constrain the diagenetic and metallogenic ages of the Dabaoshan copper deposit.
METHODSRe-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.
CONCLUSIONSThe 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 (35)

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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

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