Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting
Major, trace and rare earth element (REE) concentrations of Late Triassic sediments (fine-grained sandstones and mudstones) from Hongcan Well 1 in the NE part of the Songpan-Ganzi Basin, western China, are used to reveal weathering, provenance and tectonic setting of inferred source areas. The Chemi...
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| Format: | Article |
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Elsevier
2012-09-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987112000266 |
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| author | Yan Tang Longkang Sang Yanming Yuan Yunpeng Zhang Yunlong Yang |
| author_facet | Yan Tang Longkang Sang Yanming Yuan Yunpeng Zhang Yunlong Yang |
| author_sort | Yan Tang |
| collection | DOAJ |
| description | Major, trace and rare earth element (REE) concentrations of Late Triassic sediments (fine-grained sandstones and mudstones) from Hongcan Well 1 in the NE part of the Songpan-Ganzi Basin, western China, are used to reveal weathering, provenance and tectonic setting of inferred source areas. The Chemical Index of Alteration (CIA) reflects a low to moderate degree of chemical weathering in a cool and somewhat dry climate, and an A-CN-K plot suggests an older upper continental crust provenance dominated by felsic to intermediate igneous rocks of average tonalite composition. Based on the various geochemical tectonic setting discrimination diagrams, the Late Triassic sediments are inferred to have been deposited in a back-arc basin situated between an active continental margin (the Kunlun-Qinling Fold Belt) and a continental island arc (the Yidun Island Arc). The Triassic sediments in the study area underwent a rapid erosion and burial in a proximal slope-basin environment by the petrographic data, while the published flow directions of Triassic turbidites in the Aba-Zoige region was not supported Yidun volcanic arc source. Therefore, we suggest that the Kunlun-Qinling terrane is most likely to have supplied source materials to the northeast part of the Songpan-Ganzi Basin during the Late Triassic. |
| first_indexed | 2024-03-12T09:07:18Z |
| format | Article |
| id | doaj.art-cf399ac33a0e4e69a80675507edbacf8 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T09:07:18Z |
| publishDate | 2012-09-01 |
| publisher | Elsevier |
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| series | Geoscience Frontiers |
| spelling | doaj.art-cf399ac33a0e4e69a80675507edbacf82023-09-02T15:16:52ZengElsevierGeoscience Frontiers1674-98712012-09-013564766010.1016/j.gsf.2012.01.006Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic settingYan Tang0Longkang Sang1Yanming Yuan2Yunpeng Zhang3Yunlong Yang4College of Earth Science and Resources, Chang’an University, Xi’an 710054, PR ChinaFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074, PR ChinaFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074, PR ChinaXi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, PR ChinaSINOPEC Exploration Southern Company, Chengdu 610082, PR ChinaMajor, trace and rare earth element (REE) concentrations of Late Triassic sediments (fine-grained sandstones and mudstones) from Hongcan Well 1 in the NE part of the Songpan-Ganzi Basin, western China, are used to reveal weathering, provenance and tectonic setting of inferred source areas. The Chemical Index of Alteration (CIA) reflects a low to moderate degree of chemical weathering in a cool and somewhat dry climate, and an A-CN-K plot suggests an older upper continental crust provenance dominated by felsic to intermediate igneous rocks of average tonalite composition. Based on the various geochemical tectonic setting discrimination diagrams, the Late Triassic sediments are inferred to have been deposited in a back-arc basin situated between an active continental margin (the Kunlun-Qinling Fold Belt) and a continental island arc (the Yidun Island Arc). The Triassic sediments in the study area underwent a rapid erosion and burial in a proximal slope-basin environment by the petrographic data, while the published flow directions of Triassic turbidites in the Aba-Zoige region was not supported Yidun volcanic arc source. Therefore, we suggest that the Kunlun-Qinling terrane is most likely to have supplied source materials to the northeast part of the Songpan-Ganzi Basin during the Late Triassic.http://www.sciencedirect.com/science/article/pii/S1674987112000266Fine-grained sandstone-mudstoneGeochemistrySource area weatheringProvenanceTectonic settingSongpan-Ganzi Basin, China |
| spellingShingle | Yan Tang Longkang Sang Yanming Yuan Yunpeng Zhang Yunlong Yang Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting Geoscience Frontiers Fine-grained sandstone-mudstone Geochemistry Source area weathering Provenance Tectonic setting Songpan-Ganzi Basin, China |
| title | Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting |
| title_full | Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting |
| title_fullStr | Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting |
| title_full_unstemmed | Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting |
| title_short | Geochemistry of Late Triassic pelitic rocks in the NE part of Songpan-Ganzi Basin, western China: Implications for source weathering, provenance and tectonic setting |
| title_sort | geochemistry of late triassic pelitic rocks in the ne part of songpan ganzi basin western china implications for source weathering provenance and tectonic setting |
| topic | Fine-grained sandstone-mudstone Geochemistry Source area weathering Provenance Tectonic setting Songpan-Ganzi Basin, China |
| url | http://www.sciencedirect.com/science/article/pii/S1674987112000266 |
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