Yu, Yongqi and Qian, Xin and Mustapha, Khairul Azlan and Sheldrick, Thomas C. and Gan, Chengshi and Zhang, Yuzhi and Wang, Yuejun (2022) Late Paleozoic-Early Mesozoic granitic rocks in Eastern Peninsular Mmalaysia: New insights for the subduction and evolution of the Paleo-Tethys. Journal of Asian Earth Sciences, 239. ISSN 1367-9120, DOI https://doi.org/10.1016/j.jseaes.2022.105427.
Full text not available from this repository.Abstract
Well-preserved Late Paleozoic-Early Mesozoic igneous rocks in Peninsular Malaysia are important for investigating the Paleotethyan tectonic evolution. This study presents new zircon U-Pb dating, whole-rock geochemical, and Sr-Nd-Pb-Hf isotopic data for granitoids identified from the East Malaya. By utilizing all available data, the Permian-Middle Triassic granitoids in Eastern Peninsular Malaysia can be divided into three groups. Group A (289-270 Ma) I-type granites have higher epsilon(Nd) (t) values of - 6.6 to - 2.6 and zircon epsilon(Hf) (t) values of - 7.1 to + 4.9 than Group B S-type granites (285-272 Ma) with epsilon(Nd) (t) = - 10.1 and zircon epsilon(Hf) (t) = - 23.1 to + 1.5. Group C (254-244 Ma) with A-type characteristics, has epsilon(Nd) (t) and zircon epsilon(Hf) (t) values ranging from - 7.3 to - 3.8 and - 8.9 to + 2.2, respectively. The Pb isotopic values for three groups are similar with (Pb-206/Pb-20(4))(i) = 18.71-19.43, (Pb-207/Pb-204)(i) = 15.66-15.71 and (Pb-208/Pb-204)(i) = 38.27-39.43. Group A was derived from metaigneous rocks with a juvenile mafic component, while Group B was from metasedimentary rocks. Group C had a mixed source of ``ancient'' meta-mafic rocks with a juvenile mafic component. This study proposes that the Late Paleozoic-Early Mesozoic granitoids were formed in response to the subduction of the Paleotethyan Ocean, and that a tectonic transition from subduction to slab roll-back might occur at similar to 270 Ma. Subduction-related granitoids in East Malaya can northernly extend to the Tachileik Batholith in eastern Myanmar and Jinghong in SW China, and southernly link with W Borneo.
| Item Type: | Article |
|---|---|
| Funders: | National Natural Science Foundation of China (NSFC) [41830211], Guangdong Basic and Applied Basic Research Foundation [2018B030312007] |
| Uncontrolled Keywords: | Late Paleozoic-Early Mesozoic granitoids; Zircon U-Pb dating; Elements and Sr-Nd-Pb-Hf isotopes; Slab roll-back; The Eastern Paleotethyan Ocean; Eastern Peninsular Malaysia |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Science |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 26 Sep 2023 01:17 |
| Last Modified: | 26 Sep 2023 01:17 |
| URI: | http://eprints.um.edu.my/id/eprint/40876 |
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