Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes
Triassic granitoids, including the ~220Ma Shuanghu and ~210Ma Rongma granitoids studied here, are widely distributed around the Longmu-Shuanghu suture and in the Qiangtang terrane, central Tibet. The majority of these granitoids can be classified as high-K calc-alkaline in nature and yield negative...
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| Format: | Journal Article |
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Elsevier Ltd
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/41868 |
| _version_ | 1848756263323697152 |
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| author | Li, G. Li, J. Zhao, J. Qin, K. Cao, M. Evans, Noreen |
| author_facet | Li, G. Li, J. Zhao, J. Qin, K. Cao, M. Evans, Noreen |
| author_sort | Li, G. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Triassic granitoids, including the ~220Ma Shuanghu and ~210Ma Rongma granitoids studied here, are widely distributed around the Longmu-Shuanghu suture and in the Qiangtang terrane, central Tibet. The majority of these granitoids can be classified as high-K calc-alkaline in nature and yield negative Ba and Sr anomalies on primitive mantle-normalized diagrams. In addition, they are: enriched in light rare earth elements (LREE) ((La/Yb)N =1.61-21.79); strongly enriched in large ion lithophile elements (LILE: e.g., Cs, Rb, and K), and depleted in high field strength elements (HFSE: e.g., Nb and Ti). Magma mixing played a role in the genesis of the Shuanghu granodiorites, as indicated by the occurrence of dioritic enclaves and the wide range in zircon Hf compositions (eHf(t)=-15.0 to -2.5). The I-type Shuanghu granodiorites and S-type Shuanghu and Rongma granites might have been derived from melting of southern Qiangtang crust given the high initial Sr (0.7131-0.7272), low eNd(t) (-8.9 to -11.1) and zircon eHf(t) values (-15 to -7.2). The granitoids may have formed during melting of southern Qiangtang crust, heated by upwelling asthenosphere mantle, a result of break-off and delamination of the Paleo-Tethys slab in a collisional setting. |
| first_indexed | 2025-11-14T09:09:25Z |
| format | Journal Article |
| id | curtin-20.500.11937-41868 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:09:25Z |
| publishDate | 2014 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-418682017-09-13T14:19:00Z Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes Li, G. Li, J. Zhao, J. Qin, K. Cao, M. Evans, Noreen Triassic granitoids, including the ~220Ma Shuanghu and ~210Ma Rongma granitoids studied here, are widely distributed around the Longmu-Shuanghu suture and in the Qiangtang terrane, central Tibet. The majority of these granitoids can be classified as high-K calc-alkaline in nature and yield negative Ba and Sr anomalies on primitive mantle-normalized diagrams. In addition, they are: enriched in light rare earth elements (LREE) ((La/Yb)N =1.61-21.79); strongly enriched in large ion lithophile elements (LILE: e.g., Cs, Rb, and K), and depleted in high field strength elements (HFSE: e.g., Nb and Ti). Magma mixing played a role in the genesis of the Shuanghu granodiorites, as indicated by the occurrence of dioritic enclaves and the wide range in zircon Hf compositions (eHf(t)=-15.0 to -2.5). The I-type Shuanghu granodiorites and S-type Shuanghu and Rongma granites might have been derived from melting of southern Qiangtang crust given the high initial Sr (0.7131-0.7272), low eNd(t) (-8.9 to -11.1) and zircon eHf(t) values (-15 to -7.2). The granitoids may have formed during melting of southern Qiangtang crust, heated by upwelling asthenosphere mantle, a result of break-off and delamination of the Paleo-Tethys slab in a collisional setting. 2014 Journal Article http://hdl.handle.net/20.500.11937/41868 10.1016/j.jseaes.2015.02.017 Elsevier Ltd restricted |
| spellingShingle | Li, G. Li, J. Zhao, J. Qin, K. Cao, M. Evans, Noreen Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title | Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title_full | Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title_fullStr | Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title_full_unstemmed | Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title_short | Petrogenesis and tectonic setting of Triassic granitoids in the Qiangtang terrane, central Tibet: Evidence from U-Pb ages, petrochemistry and Sr-Nd-Hf isotopes |
| title_sort | petrogenesis and tectonic setting of triassic granitoids in the qiangtang terrane, central tibet: evidence from u-pb ages, petrochemistry and sr-nd-hf isotopes |
| url | http://hdl.handle.net/20.500.11937/41868 |