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
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 D...
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Science Press, PR China
2022-03-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202107270085 |
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| author | LIU Wusheng ZHAO Hong ZHAO Ruyi QIN Jinhua ZHANG Xiong JIANG Jinchang ZHAO Chenhui LI Tingjie WANG Chenghui |
| author_facet | LIU Wusheng ZHAO Hong ZHAO Ruyi QIN Jinhua ZHANG Xiong JIANG Jinchang ZHAO Chenhui LI Tingjie WANG Chenghui |
| author_sort | LIU Wusheng |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T23:11:24Z |
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| id | doaj.art-acb2ad4f18564c9aa33b92d13a5fd855 |
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| language | English |
| last_indexed | 2024-04-10T23:11:24Z |
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| spelling | doaj.art-acb2ad4f18564c9aa33b92d13a5fd8552023-01-13T05:42:00ZengScience Press, PR ChinaYankuang ceshi0254-53572022-03-0141230031310.15898/j.cnki.11-2131/td.202107270085yk202107270085The 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 ProvinceLIU Wusheng0ZHAO Hong1ZHAO Ruyi2QIN Jinhua3ZHANG Xiong4JIANG Jinchang5ZHAO Chenhui6LI Tingjie7WANG Chenghui8Guangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, ChinaInstitute of Geological Survey, China University of Geosciences (Wuhan), Wuhan 430074, ChinaState Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 300013, ChinaKey Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaGuangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, ChinaGuangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, ChinaKey Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaGuangdong Dabaoshan Mining Co., Ltd., Shaoguan 512127, ChinaKey Laboratory of Mineralization and Resource Evaluation, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaBACKGROUND 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.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202107270085negative ion thermal ionization mass spectrometryla-icp-mscarbonaceous mudstonere-os isotopedetrital zirconu-pb isotopedabaoshan copper depositmetallogenic age |
| spellingShingle | 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 Yankuang ceshi negative ion thermal ionization mass spectrometry la-icp-ms carbonaceous mudstone re-os isotope detrital zircon u-pb isotope dabaoshan copper deposit metallogenic age |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | negative ion thermal ionization mass spectrometry la-icp-ms carbonaceous mudstone re-os isotope detrital zircon u-pb isotope dabaoshan copper deposit metallogenic age |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202107270085 |
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