Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events
The Mesoproterozoic Dongchuan Group that is widely exposed in Yimen area, central Yunnan Province is a series of sedimentary sort of low-grade metamorphic rocks interbedded with volcanic rocks, which are closely related to the early tectonic evolution of the Earth. However, its formation era, sedime...
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KeAi Communications Co., Ltd.
2021-12-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2096519222000076 |
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| author | Jun-ping Liu Su-mei Tian Xun-zao Zhu Jin-hua Ma Jing Li Shao-bin Hu Sai-ying Yu Hu Zhang Zhong-ming She Xu-gui Li |
| author_facet | Jun-ping Liu Su-mei Tian Xun-zao Zhu Jin-hua Ma Jing Li Shao-bin Hu Sai-ying Yu Hu Zhang Zhong-ming She Xu-gui Li |
| author_sort | Jun-ping Liu |
| collection | DOAJ |
| description | The Mesoproterozoic Dongchuan Group that is widely exposed in Yimen area, central Yunnan Province is a series of sedimentary sort of low-grade metamorphic rocks interbedded with volcanic rocks, which are closely related to the early tectonic evolution of the Earth. However, its formation era, sedimentary filling sequence, and geotectonic characteristics have always been in dispute. In this study, several rhyolitic tuffaceous slate interlayers with a centimeter-level thickness were found in the previously determined Heishan Formation of the Dongchuan Group located to the western part of Yimen-Luoci fault zone. This paper focuses on the study of the rhyolitic tuffaceous slate in Qifulangqing Village, Tongchang Township, Yimen County. LA-ICP-MS zircon dating was conducted, achieving the crystallization age of magma of 2491 ± 15 Ma and the metamorphic ages of about 2.3 Ga, 2.0 Ga, and 1.8 Ga for the first time. Meanwhile, according to in-situ Hf isotope analysis, the zircon εHf(t) values were determined to range from −3.0 to 7.6, with an average of 2.7. Furthermore, the first-stage Hf model age (TDM1) was determined to be 2513−2916 Ma, indicating that the provenance of the rhyolitic tuffaceous slate is the depleted mantle or juvenile crust between the Middle Mesoarchean and the Late Neoarchean. Therefore, it is believed that the strata of the slate were deposited in the Late Neoarchean, instead of the Mesoproterozoic as determined by previous researchers. Accordingly, it is not appropriate to group the strata into the Mesoproterozoic Dongchuan Group. Instead, they should be classified as the Maolu Formation of the Neoarchean Puduhe Group given the lithologic association and regional information. Furthermore, the magma ages of 2491 ± 15 Ma are highly consistent with the eras of the large-scale Late Neoarchean orogenic magmatic activities on the northern margin of the Yangtze Craton, and thus reflect the orogenic process consisting of subduction and collision from Late Neoarchean to Early Paleoproterozoic. The magmatic activities during this period were possibly caused by the convergence of the supercontinent Kenorland. Meanwhile, the metamorphic ages of 2.3 Ga, 2.0 Ga, and 1.8 Ga are highly consistent with three metamorphic ages of 2.36 Ga, 1.95 Ga, and 1.85 Ga of the northern margin of the Yangtze Craton, indicating that the strata experienced Paleoproterozoic tectonic-thermal events. The study area is located on the eastern margin of Qinghai-Tibet Plateau, and thus was possibly re-transformed by magmatism subjected to the subduction of the Meso-Tethys Ocean during the Early Cretaceous. The discoveries made in this study will provide strong petrological and chronological evidence for analyzing the early crustal evolution of the Yangtze block.©2021 China Geology Editorial Office. |
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| spelling | doaj.art-7113f90aefb04012ae42fa19c9ca179e2023-02-07T04:22:46ZengKeAi Communications Co., Ltd.China Geology2096-51922021-12-0144616629Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal eventsJun-ping Liu0Su-mei Tian1Xun-zao Zhu2Jin-hua Ma3Jing Li4Shao-bin Hu5Sai-ying Yu6Hu Zhang7Zhong-ming She8Xu-gui Li9Yunnan Institute of Geological Survey, Kunming 650216, China; China University of Geosciences, Beijing 100083, China; Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, China; Corresponding author: E-mail address: 271090834@qq.com (Jun-ping Liu); 313470364@qq.com (Su-mei Tian); 871047952@qq.com (Xun-zao Zhu).Yunnan Institute of Geological Survey, Kunming 650216, China; Corresponding author: E-mail address: 271090834@qq.com (Jun-ping Liu); 313470364@qq.com (Su-mei Tian); 871047952@qq.com (Xun-zao Zhu).Yunnan Institute of Geological Survey, Kunming 650216, China; Corresponding author: E-mail address: 271090834@qq.com (Jun-ping Liu); 313470364@qq.com (Su-mei Tian); 871047952@qq.com (Xun-zao Zhu).Yunnan Institute of Geological Survey, Kunming 650216, ChinaYunnan Institute of Geological Survey, Kunming 650216, China; Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, ChinaYunnan Institute of Geological Survey, Kunming 650216, China; Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, ChinaYunnan Institute of Geological Survey, Kunming 650216, China; Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, ChinaYunnan Institute of Geological Survey, Kunming 650216, China; Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural Resources, Kunming 650051, ChinaYunnan Department of Natural Resources, Kunming 65000, ChinaYunnan Institute of Geological Survey, Kunming 650216, ChinaThe Mesoproterozoic Dongchuan Group that is widely exposed in Yimen area, central Yunnan Province is a series of sedimentary sort of low-grade metamorphic rocks interbedded with volcanic rocks, which are closely related to the early tectonic evolution of the Earth. However, its formation era, sedimentary filling sequence, and geotectonic characteristics have always been in dispute. In this study, several rhyolitic tuffaceous slate interlayers with a centimeter-level thickness were found in the previously determined Heishan Formation of the Dongchuan Group located to the western part of Yimen-Luoci fault zone. This paper focuses on the study of the rhyolitic tuffaceous slate in Qifulangqing Village, Tongchang Township, Yimen County. LA-ICP-MS zircon dating was conducted, achieving the crystallization age of magma of 2491 ± 15 Ma and the metamorphic ages of about 2.3 Ga, 2.0 Ga, and 1.8 Ga for the first time. Meanwhile, according to in-situ Hf isotope analysis, the zircon εHf(t) values were determined to range from −3.0 to 7.6, with an average of 2.7. Furthermore, the first-stage Hf model age (TDM1) was determined to be 2513−2916 Ma, indicating that the provenance of the rhyolitic tuffaceous slate is the depleted mantle or juvenile crust between the Middle Mesoarchean and the Late Neoarchean. Therefore, it is believed that the strata of the slate were deposited in the Late Neoarchean, instead of the Mesoproterozoic as determined by previous researchers. Accordingly, it is not appropriate to group the strata into the Mesoproterozoic Dongchuan Group. Instead, they should be classified as the Maolu Formation of the Neoarchean Puduhe Group given the lithologic association and regional information. Furthermore, the magma ages of 2491 ± 15 Ma are highly consistent with the eras of the large-scale Late Neoarchean orogenic magmatic activities on the northern margin of the Yangtze Craton, and thus reflect the orogenic process consisting of subduction and collision from Late Neoarchean to Early Paleoproterozoic. The magmatic activities during this period were possibly caused by the convergence of the supercontinent Kenorland. Meanwhile, the metamorphic ages of 2.3 Ga, 2.0 Ga, and 1.8 Ga are highly consistent with three metamorphic ages of 2.36 Ga, 1.95 Ga, and 1.85 Ga of the northern margin of the Yangtze Craton, indicating that the strata experienced Paleoproterozoic tectonic-thermal events. The study area is located on the eastern margin of Qinghai-Tibet Plateau, and thus was possibly re-transformed by magmatism subjected to the subduction of the Meso-Tethys Ocean during the Early Cretaceous. The discoveries made in this study will provide strong petrological and chronological evidence for analyzing the early crustal evolution of the Yangtze block.©2021 China Geology Editorial Office.http://www.sciencedirect.com/science/article/pii/S2096519222000076Maolu FormationPuduhe GroupLate NeoarcheanZircon U-Pb ageTectonic-thermal eventGeological survey engineering |
| spellingShingle | Jun-ping Liu Su-mei Tian Xun-zao Zhu Jin-hua Ma Jing Li Shao-bin Hu Sai-ying Yu Hu Zhang Zhong-ming She Xu-gui Li Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events China Geology Maolu Formation Puduhe Group Late Neoarchean Zircon U-Pb age Tectonic-thermal event Geological survey engineering |
| title | Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events |
| title_full | Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events |
| title_fullStr | Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events |
| title_full_unstemmed | Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events |
| title_short | Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton: Zircon U-Pb ages (2491 Ma) and tectonic-thermal events |
| title_sort | discovery of rhyolitic tuffaceous slate in the southwestern margin of yangtze craton zircon u pb ages 2491 ma and tectonic thermal events |
| topic | Maolu Formation Puduhe Group Late Neoarchean Zircon U-Pb age Tectonic-thermal event Geological survey engineering |
| url | http://www.sciencedirect.com/science/article/pii/S2096519222000076 |
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