Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China
Late Paleozoic plutons are widely distributed in the Alxa region, southernmost Central Asian Orogenic Belt, and provided an important clue in constraint for the closing time of the Paleo-Asian Ocean (PAO). In this article, we present new zircon U-Pb ages and whole-rock geochemical data from the Perm...
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| Format: | Article |
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De Gruyter
2024-03-01
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| Series: | Open Geosciences |
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| Online Access: | https://doi.org/10.1515/geo-2022-0618 |
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| author | Wang Erteng Zhai Xinwei Huang Yaoshen Li Chengze Su Ruihuan Wu Lei Song Gaorui Guo Zhiang Chen Wanfeng Wang Jinrong |
| author_facet | Wang Erteng Zhai Xinwei Huang Yaoshen Li Chengze Su Ruihuan Wu Lei Song Gaorui Guo Zhiang Chen Wanfeng Wang Jinrong |
| author_sort | Wang Erteng |
| collection | DOAJ |
| description | Late Paleozoic plutons are widely distributed in the Alxa region, southernmost Central Asian Orogenic Belt, and provided an important clue in constraint for the closing time of the Paleo-Asian Ocean (PAO). In this article, we present new zircon U-Pb ages and whole-rock geochemical data from the Permian Huoersen and Zongnaishan plutons in the southern Alxa region. The Huoersen gabbro (ca. 285 Ma) is enriched in large-ion lithophile elements and depleted in high-field strength elements, similar to the features of continental marginal arc. They were most likely generated by partial melting of depleted mantle that was modified by subduction metasomatic fluids. The Zongnaishan granites (ca. 267 Ma) show characteristics of I-type granites and were generated in a syn-collision setting. The Huoersen granites (ca. 259 Ma) are peralkaline and have positive Ɛ
Nd(t) (+1.2 to +1.5) values, exhibiting A2-subtype granites affinities. They were formed by melting of lower crust in post-collision extension setting. Based on geodynamic mechanism, a three-stage evolution model is delineated: subduction, syn-collision to post-collisional extension for oceanic branch of the PAO during the Permian. In general, the rock assemblages indicate a tectonic switch from subduction to post-collision extension regimes and the final closure of the PAO. |
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| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2391-5447 |
| language | English |
| last_indexed | 2024-04-24T22:53:04Z |
| publishDate | 2024-03-01 |
| publisher | De Gruyter |
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| series | Open Geosciences |
| spelling | doaj.art-ddc9b39a7b454cd188c4cfdb0de0c7cd2024-03-18T10:27:41ZengDe GruyterOpen Geosciences2391-54472024-03-0116111310.1515/geo-2022-0618Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW ChinaWang Erteng0Zhai Xinwei1Huang Yaoshen2Li Chengze3Su Ruihuan4Wu Lei5Song Gaorui6Guo Zhiang7Chen Wanfeng8Wang Jinrong9School of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaChongqing Earthquake Agency, Chongqing, 404100ChinaPetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou730000, ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaCollege of Geography and Tourism, Hunan University of Arts and Science, Changde, 415000ChinaSchool of Earth Science, Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou, 730000, ChinaLate Paleozoic plutons are widely distributed in the Alxa region, southernmost Central Asian Orogenic Belt, and provided an important clue in constraint for the closing time of the Paleo-Asian Ocean (PAO). In this article, we present new zircon U-Pb ages and whole-rock geochemical data from the Permian Huoersen and Zongnaishan plutons in the southern Alxa region. The Huoersen gabbro (ca. 285 Ma) is enriched in large-ion lithophile elements and depleted in high-field strength elements, similar to the features of continental marginal arc. They were most likely generated by partial melting of depleted mantle that was modified by subduction metasomatic fluids. The Zongnaishan granites (ca. 267 Ma) show characteristics of I-type granites and were generated in a syn-collision setting. The Huoersen granites (ca. 259 Ma) are peralkaline and have positive Ɛ Nd(t) (+1.2 to +1.5) values, exhibiting A2-subtype granites affinities. They were formed by melting of lower crust in post-collision extension setting. Based on geodynamic mechanism, a three-stage evolution model is delineated: subduction, syn-collision to post-collisional extension for oceanic branch of the PAO during the Permian. In general, the rock assemblages indicate a tectonic switch from subduction to post-collision extension regimes and the final closure of the PAO.https://doi.org/10.1515/geo-2022-0618geochemicalpermiantectonic switchalxa regioncentral asian orogenic belt |
| spellingShingle | Wang Erteng Zhai Xinwei Huang Yaoshen Li Chengze Su Ruihuan Wu Lei Song Gaorui Guo Zhiang Chen Wanfeng Wang Jinrong Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China Open Geosciences geochemical permian tectonic switch alxa region central asian orogenic belt |
| title | Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China |
| title_full | Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China |
| title_fullStr | Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China |
| title_full_unstemmed | Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China |
| title_short | Permian tectonic switch of the southern Central Asian Orogenic Belt: Constraints from magmatism in the southern Alxa region, NW China |
| title_sort | permian tectonic switch of the southern central asian orogenic belt constraints from magmatism in the southern alxa region nw china |
| topic | geochemical permian tectonic switch alxa region central asian orogenic belt |
| url | https://doi.org/10.1515/geo-2022-0618 |
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