Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution
IntroductionThe east-west trending Khondalite Belt, located on the northern margin of the North China Craton, is linked to the Paleoproterozoic Columbia supercontinent’s evolution. However, the relationship between the Khondalite Belt formation and orogenic processes remains unclear.MethodsField inv...
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Frontiers Media S.A.
2024-12-01
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| author | Hao Hu Dongyan Zhong Zhiguang Zhou Guosheng Wang Shen Gao Jianfeng Chen Chenfei Feng |
| author_facet | Hao Hu Dongyan Zhong Zhiguang Zhou Guosheng Wang Shen Gao Jianfeng Chen Chenfei Feng |
| author_sort | Hao Hu |
| collection | DOAJ |
| description | IntroductionThe east-west trending Khondalite Belt, located on the northern margin of the North China Craton, is linked to the Paleoproterozoic Columbia supercontinent’s evolution. However, the relationship between the Khondalite Belt formation and orogenic processes remains unclear.MethodsField investigations, petrology, zircon U-Pb dating, whole-rock geochemistry, and electron probe mineral thermobarometry.ResultsGarnet-bearing pyroxenite and serpentinite-like dunite in the ultramafites have zircon U-Pb ages of (1947 ± 17) Ma and (1960 ± 25) Ma, respectively. The rocks show characteristics of subalkaline tholeiitic basalt series, with low SiO2 (35.79%–50.77%), TiO2 (0.01%–0.71%), Al2O3 (0.17%–3.39%), and alkalis (0.02%–2.01%), but high Fe2O3 (12.92%–15.06%). These rocks are enriched in light rare earth elements with slight depletion of Eu, enriched in large ion lithophile elements (Rb and K), and depleted in high field strength elements (P, Zr, and Hf).DiscussionThese metamorphic environments imply that the conditions for ultramafites formation were insufficient to induce granulite-facies metamorphism in the surrounding rocks, indicating that granulite-facies metamorphism in the Khondalite Belt is not closely related to post-orogenic extension in the Inner Mongolia-Northern Hebei orogenic belt. |
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| language | English |
| publishDate | 2024-12-01 |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-d104ee515cee4e3b89a7812a5cd786d42025-08-20T01:59:21ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632024-12-011210.3389/feart.2024.15083941508394Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolutionHao HuDongyan ZhongZhiguang ZhouGuosheng WangShen GaoJianfeng ChenChenfei FengIntroductionThe east-west trending Khondalite Belt, located on the northern margin of the North China Craton, is linked to the Paleoproterozoic Columbia supercontinent’s evolution. However, the relationship between the Khondalite Belt formation and orogenic processes remains unclear.MethodsField investigations, petrology, zircon U-Pb dating, whole-rock geochemistry, and electron probe mineral thermobarometry.ResultsGarnet-bearing pyroxenite and serpentinite-like dunite in the ultramafites have zircon U-Pb ages of (1947 ± 17) Ma and (1960 ± 25) Ma, respectively. The rocks show characteristics of subalkaline tholeiitic basalt series, with low SiO2 (35.79%–50.77%), TiO2 (0.01%–0.71%), Al2O3 (0.17%–3.39%), and alkalis (0.02%–2.01%), but high Fe2O3 (12.92%–15.06%). These rocks are enriched in light rare earth elements with slight depletion of Eu, enriched in large ion lithophile elements (Rb and K), and depleted in high field strength elements (P, Zr, and Hf).DiscussionThese metamorphic environments imply that the conditions for ultramafites formation were insufficient to induce granulite-facies metamorphism in the surrounding rocks, indicating that granulite-facies metamorphism in the Khondalite Belt is not closely related to post-orogenic extension in the Inner Mongolia-Northern Hebei orogenic belt.https://www.frontiersin.org/articles/10.3389/feart.2024.1508394/fullultramafitesInner Mongolia-North Hebei orogenic beltKhondaliteszircon U-Pb geochronologygeochemistry |
| spellingShingle | Hao Hu Dongyan Zhong Zhiguang Zhou Guosheng Wang Shen Gao Jianfeng Chen Chenfei Feng Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution Frontiers in Earth Science ultramafites Inner Mongolia-North Hebei orogenic belt Khondalites zircon U-Pb geochronology geochemistry |
| title | Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution |
| title_full | Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution |
| title_fullStr | Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution |
| title_full_unstemmed | Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution |
| title_short | Petrogenesis of the paleoproterozoic ultramafites in Wuchuan area, Inner Mongolia: implications for tectonic evolution |
| title_sort | petrogenesis of the paleoproterozoic ultramafites in wuchuan area inner mongolia implications for tectonic evolution |
| topic | ultramafites Inner Mongolia-North Hebei orogenic belt Khondalites zircon U-Pb geochronology geochemistry |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1508394/full |
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