Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension
The Late Paleozoic granitoids widely distributed in the central section of the East Kunlun Orogenic Belt (EKOB) are responsible for the constraints on its post-collisional extensional processes. We report the whole-rock geochemical compositions, zircon U-Pb ages, and zircon Hf isotope data of granit...
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2025-06-01
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| author | Bang-Shi Dong Wen-Qin Wang Gen-Hou Wang Pei-Lie Zhang Peng-Sheng Li Zhao-Lei Ding Ze-Jun He Pu Zhao Jing-Qi Zhang Chao Bo |
| author_facet | Bang-Shi Dong Wen-Qin Wang Gen-Hou Wang Pei-Lie Zhang Peng-Sheng Li Zhao-Lei Ding Ze-Jun He Pu Zhao Jing-Qi Zhang Chao Bo |
| author_sort | Bang-Shi Dong |
| collection | DOAJ |
| description | The Late Paleozoic granitoids widely distributed in the central section of the East Kunlun Orogenic Belt (EKOB) are responsible for the constraints on its post-collisional extensional processes. We report the whole-rock geochemical compositions, zircon U-Pb ages, and zircon Hf isotope data of granites in the western Kendewula area. The granites, dated between 413.7 Ma and 417.7 Ma, indicate emplacement during the Early Devonian period. The granite is characterized by high silicon content (72.45–78.96 wt%), high and alkali content (7.59–9.35 wt%), high 10,000 × Ga/Al values, and low Al2O3 (11.29–13.32 wt%), CaO (0.07–0.31 wt%), and MgO contents (0.16–0.94 wt%). The rocks exhibit enrichment in large-ion lithophile element (LILE) content and high-field-strength element (HFSE) content, in addition to strong losses, showing significant depletion in Ba, Sr, P and Eu. These geochemical characteristics correspond to A2-type granites. The values of Rb/N and Ba/La and the higher zircon saturation temperature (800~900 °C) indicate that the magma source is mainly crustal, with the participation of mantle materials, although limited. In addition, the zircon εHf(t) values (−4.3–3.69) also support this view. In summary, the A2-type granite exposed in the western Kendewula region formed against a post-collisional extensional setting background, suggesting that the Southern Kunlun Terrane (SKT) entered a post-orogenic extensional phase in the evolution stage since the Early Devonian. The upwelling of the asthenospheric mantle of the crust, triggered by crustal detachment and partial melting, likely contributed to the flare-up of A2-type granite during this period. By studying the nature of granite produced during orogeny, the evolution process of the formation of orogenic belts is discussed, and our understanding of orogenic is enhanced. |
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| institution | Kabale University |
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| publishDate | 2025-06-01 |
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| spelling | doaj-art-c5d9f2bfa4594aaca10b8520d2a4f0ae2025-08-20T03:32:28ZengMDPI AGApplied Sciences2076-34172025-06-011512666110.3390/app15126661Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision ExtensionBang-Shi Dong0Wen-Qin Wang1Gen-Hou Wang2Pei-Lie Zhang3Peng-Sheng Li4Zhao-Lei Ding5Ze-Jun He6Pu Zhao7Jing-Qi Zhang8Chao Bo9School of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaThe Second Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Exploration and Development, Lanzhou 730020, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaXidihuiyou Mining Technology Co., Ltd., Anning District, Lanzhou 730020, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Earth Sciencesand Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaThe Late Paleozoic granitoids widely distributed in the central section of the East Kunlun Orogenic Belt (EKOB) are responsible for the constraints on its post-collisional extensional processes. We report the whole-rock geochemical compositions, zircon U-Pb ages, and zircon Hf isotope data of granites in the western Kendewula area. The granites, dated between 413.7 Ma and 417.7 Ma, indicate emplacement during the Early Devonian period. The granite is characterized by high silicon content (72.45–78.96 wt%), high and alkali content (7.59–9.35 wt%), high 10,000 × Ga/Al values, and low Al2O3 (11.29–13.32 wt%), CaO (0.07–0.31 wt%), and MgO contents (0.16–0.94 wt%). The rocks exhibit enrichment in large-ion lithophile element (LILE) content and high-field-strength element (HFSE) content, in addition to strong losses, showing significant depletion in Ba, Sr, P and Eu. These geochemical characteristics correspond to A2-type granites. The values of Rb/N and Ba/La and the higher zircon saturation temperature (800~900 °C) indicate that the magma source is mainly crustal, with the participation of mantle materials, although limited. In addition, the zircon εHf(t) values (−4.3–3.69) also support this view. In summary, the A2-type granite exposed in the western Kendewula region formed against a post-collisional extensional setting background, suggesting that the Southern Kunlun Terrane (SKT) entered a post-orogenic extensional phase in the evolution stage since the Early Devonian. The upwelling of the asthenospheric mantle of the crust, triggered by crustal detachment and partial melting, likely contributed to the flare-up of A2-type granite during this period. By studying the nature of granite produced during orogeny, the evolution process of the formation of orogenic belts is discussed, and our understanding of orogenic is enhanced.https://www.mdpi.com/2076-3417/15/12/6661Southern Kunlun TerraneA-type granitegeochemistry and chronologyzircon Hf isotopepost-collision extension |
| spellingShingle | Bang-Shi Dong Wen-Qin Wang Gen-Hou Wang Pei-Lie Zhang Peng-Sheng Li Zhao-Lei Ding Ze-Jun He Pu Zhao Jing-Qi Zhang Chao Bo Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension Applied Sciences Southern Kunlun Terrane A-type granite geochemistry and chronology zircon Hf isotope post-collision extension |
| title | Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension |
| title_full | Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension |
| title_fullStr | Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension |
| title_full_unstemmed | Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension |
| title_short | Geochemistry and Zircon U-Pb Chronology of West Kendewula Late Paleozoic A-Type Granites in the East Kunlun Orogenic Belt: Implications for Post-Collision Extension |
| title_sort | geochemistry and zircon u pb chronology of west kendewula late paleozoic a type granites in the east kunlun orogenic belt implications for post collision extension |
| topic | Southern Kunlun Terrane A-type granite geochemistry and chronology zircon Hf isotope post-collision extension |
| url | https://www.mdpi.com/2076-3417/15/12/6661 |
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