Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology
The Ailaoshan orogenic belt, located in the SE margin of the Qinghai–Tibet Plateau, is an important Paleo-Tethys suture zone in the eastern margin of the Sanjiang Tethys tectonic domain. The areas of Mojiang and Zhenyuan, located in the middle part of the Ailaoshan orogenic belt, are the key parts o...
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MDPI AG
2022-05-01
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| author | Yaoyao Zhang Kai Liu Ye Wang Da Zhang Xuanxue Mo Yuefei Deng Tingxi Yu Zenan Zhao |
| author_facet | Yaoyao Zhang Kai Liu Ye Wang Da Zhang Xuanxue Mo Yuefei Deng Tingxi Yu Zenan Zhao |
| author_sort | Yaoyao Zhang |
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| description | The Ailaoshan orogenic belt, located in the SE margin of the Qinghai–Tibet Plateau, is an important Paleo-Tethys suture zone in the eastern margin of the Sanjiang Tethys tectonic domain. The areas of Mojiang and Zhenyuan, located in the middle part of the Ailaoshan orogenic belt, are the key parts of the Ailaoshan Paleo-Tethys Ocean closure and collision orogeny. The rhyolites outcropped in the Mojiang area, and the granite porphyries outcropped in Zhenyuan area, are systematically studied for petrology, isotope geochemistry and geochronology. The Zircon U-Pb geochronology of rhyolites and granite porphyries give weighted average ages of 253.4 ± 4.2 Ma and 253.3 ± 2.0 Ma, respectively, both of which were formed in the late Permian period. The rhyolites belong to potassic calc-alkaline to subalkaline series. The patterns of the rare earth elements (REE) show a right-inclined seagull-type distribution, and the trace elements plot is right-inclined. The granite porphyries are high potassic calc-alkaline to subalkaline. The REE patterns show a right-inclined distribution, and the trace elements plot is right-inclined, which is consistent with the typical patterns observed in the crust. The peraluminous, highly differentiated and high ASI values suggest that rhyolites and granite porphyries are S-type granites. The zircon εHf(<i>t</i>) of the rhyolites range from −7.22 to −0.72, and two-stage Hf zircon model ages are (T<sub>DM</sub><sup>C</sup>) 1771–2352 Ma, indicating that the magma source area is mainly crust-derived. The zircon εHf(<i>t</i>) of the granite porphyries range from −0.97 to 4.08, and two-stage Hf zircon model ages are (T<sub>DM</sub><sup>C</sup>) 1336–1795 Ma, indicating that the magma is derived from a depleted mantle source and the partial melting of ancient crustal materials. The rhyolites and granite porphyries were possibly formed in the syn-collisional tectonic setting during the late Permian, and their ages limited the time of the final closure of the Ailaoshan Ocean and the initiation of collisional orogeny. |
| first_indexed | 2024-03-10T03:21:19Z |
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| spelling | doaj.art-99c38531331b4865b503121b21a8240c2023-11-23T12:20:03ZengMDPI AGMinerals2075-163X2022-05-0112565210.3390/min12050652Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and GeochronologyYaoyao Zhang0Kai Liu1Ye Wang2Da Zhang3Xuanxue Mo4Yuefei Deng5Tingxi Yu6Zenan Zhao7Laboratory of Deep Earth Science and Exploration Technology, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaLaboratory of Deep Earth Science and Exploration Technology, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaLaboratory of Deep Earth Science and Exploration Technology, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaSchool of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaCIGIS (CHINA) LIMITED, Beijing 100007, ChinaLaboratory of Deep Earth Science and Exploration Technology, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100037, ChinaHebei Regional Geological Survey Institute, Langfang 065000, ChinaThe Ailaoshan orogenic belt, located in the SE margin of the Qinghai–Tibet Plateau, is an important Paleo-Tethys suture zone in the eastern margin of the Sanjiang Tethys tectonic domain. The areas of Mojiang and Zhenyuan, located in the middle part of the Ailaoshan orogenic belt, are the key parts of the Ailaoshan Paleo-Tethys Ocean closure and collision orogeny. The rhyolites outcropped in the Mojiang area, and the granite porphyries outcropped in Zhenyuan area, are systematically studied for petrology, isotope geochemistry and geochronology. The Zircon U-Pb geochronology of rhyolites and granite porphyries give weighted average ages of 253.4 ± 4.2 Ma and 253.3 ± 2.0 Ma, respectively, both of which were formed in the late Permian period. The rhyolites belong to potassic calc-alkaline to subalkaline series. The patterns of the rare earth elements (REE) show a right-inclined seagull-type distribution, and the trace elements plot is right-inclined. The granite porphyries are high potassic calc-alkaline to subalkaline. The REE patterns show a right-inclined distribution, and the trace elements plot is right-inclined, which is consistent with the typical patterns observed in the crust. The peraluminous, highly differentiated and high ASI values suggest that rhyolites and granite porphyries are S-type granites. The zircon εHf(<i>t</i>) of the rhyolites range from −7.22 to −0.72, and two-stage Hf zircon model ages are (T<sub>DM</sub><sup>C</sup>) 1771–2352 Ma, indicating that the magma source area is mainly crust-derived. The zircon εHf(<i>t</i>) of the granite porphyries range from −0.97 to 4.08, and two-stage Hf zircon model ages are (T<sub>DM</sub><sup>C</sup>) 1336–1795 Ma, indicating that the magma is derived from a depleted mantle source and the partial melting of ancient crustal materials. The rhyolites and granite porphyries were possibly formed in the syn-collisional tectonic setting during the late Permian, and their ages limited the time of the final closure of the Ailaoshan Ocean and the initiation of collisional orogeny.https://www.mdpi.com/2075-163X/12/5/652rhyolitesgranite porphyriesgeochemistryLu-Hf isotopesAilaoshan orogenic belt |
| spellingShingle | Yaoyao Zhang Kai Liu Ye Wang Da Zhang Xuanxue Mo Yuefei Deng Tingxi Yu Zenan Zhao Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology Minerals rhyolites granite porphyries geochemistry Lu-Hf isotopes Ailaoshan orogenic belt |
| title | Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology |
| title_full | Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology |
| title_fullStr | Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology |
| title_full_unstemmed | Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology |
| title_short | Geological Significance of Late Permian Magmatic Rocks in the Middle Section of the Ailaoshan Orogenic Belt, SW China: Constraints from Petrology, Geochemistry and Geochronology |
| title_sort | geological significance of late permian magmatic rocks in the middle section of the ailaoshan orogenic belt sw china constraints from petrology geochemistry and geochronology |
| topic | rhyolites granite porphyries geochemistry Lu-Hf isotopes Ailaoshan orogenic belt |
| url | https://www.mdpi.com/2075-163X/12/5/652 |
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