Xin Qian, Tianxing Bai, Yongqi Yu, K. A. Mustapha, Thomas C. Sheldrick, Chengshi Gan, Yuejun Wang
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Despite Group 2 granite porphyries (∼131 Ma) with A-type affinities and Group 3 granitic gneisses (∼130 Ma) with I-type affinities share similar\n \n \n ε\n \n \n Nd\n (t) values (−5.5–−7.2), zircon\n \n \n ε\n \n \n Hf\n (t) values (−10.1–+6.5), and initial ratios for\n 206\n Pb/\n 204\n Pb (18.81–19.02),\n 207\n Pb/\n 204\n Pb (15.71–15.77) and\n 208\n Pb/\n 204\n Pb (38.95–39.95). Although Group 2 and 3 samples were derived from an “ancient” meta-mafic source region, Group 2 has evidence for the involvement of a juvenile mafic component. All these granitoids are akin to the Permian–Triassic igneous rocks in East Malaya. The Jurassic–Cretaceous igneous rocks in Eastern Peninsular Malaysia were formed during multiple stages of continental rifting in response to pulses of the Paleo-Pacific slab rollback rather than from Tethyan evolutionary processes.\n \n \n Thematic collection:\n This article is part of the Mesozoic and Cenozoic tectonics, landscape and climate change collection available at:\n https://www.lyellcollection.org/topic/collections/mesozoic-and-cenozoic-tectonics-landscape-and-climate-change\n \n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.6689085\n","PeriodicalId":17320,"journal":{"name":"Journal of the Geological Society","volume":" ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Multiple stages of continental rifting in Eastern Peninsular Malaysia: New insights from Jurassic–Cretaceous granitoids\",\"authors\":\"Xin Qian, Tianxing Bai, Yongqi Yu, K. 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Despite Group 2 granite porphyries (∼131 Ma) with A-type affinities and Group 3 granitic gneisses (∼130 Ma) with I-type affinities share similar\\n \\n \\n ε\\n \\n \\n Nd\\n (t) values (−5.5–−7.2), zircon\\n \\n \\n ε\\n \\n \\n Hf\\n (t) values (−10.1–+6.5), and initial ratios for\\n 206\\n Pb/\\n 204\\n Pb (18.81–19.02),\\n 207\\n Pb/\\n 204\\n Pb (15.71–15.77) and\\n 208\\n Pb/\\n 204\\n Pb (38.95–39.95). Although Group 2 and 3 samples were derived from an “ancient” meta-mafic source region, Group 2 has evidence for the involvement of a juvenile mafic component. All these granitoids are akin to the Permian–Triassic igneous rocks in East Malaya. 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Multiple stages of continental rifting in Eastern Peninsular Malaysia: New insights from Jurassic–Cretaceous granitoids
Mesozoic granitoids in Peninsular Malaysia provide crucial information on the temporal-spatial relationship between the Tethyan and Paleo-Pacific domains. This paper presents new ages and geochemical data for the newly identified Jurassic–Cretaceous granites and meta-granites in East Malaya. These granitoids can be divided into three groups. Group 1 high-K calc-alkaline granites and granodiorites (171–162 Ma) have variable
ε
Nd
(t) values of −7.4–+0.5, zircon
ε
Hf
(t) values of −7.4–+8.6, and high initial ratios for
206
Pb/
204
Pb (20.04–20.65),
207
Pb/
204
Pb (15.73–15.7) and
208
Pb/
204
Pb (39.80–40.20). These samples were probably derived from the metasedimentary rocks with a juvenile mafic component. Despite Group 2 granite porphyries (∼131 Ma) with A-type affinities and Group 3 granitic gneisses (∼130 Ma) with I-type affinities share similar
ε
Nd
(t) values (−5.5–−7.2), zircon
ε
Hf
(t) values (−10.1–+6.5), and initial ratios for
206
Pb/
204
Pb (18.81–19.02),
207
Pb/
204
Pb (15.71–15.77) and
208
Pb/
204
Pb (38.95–39.95). Although Group 2 and 3 samples were derived from an “ancient” meta-mafic source region, Group 2 has evidence for the involvement of a juvenile mafic component. All these granitoids are akin to the Permian–Triassic igneous rocks in East Malaya. The Jurassic–Cretaceous igneous rocks in Eastern Peninsular Malaysia were formed during multiple stages of continental rifting in response to pulses of the Paleo-Pacific slab rollback rather than from Tethyan evolutionary processes.
Thematic collection:
This article is part of the Mesozoic and Cenozoic tectonics, landscape and climate change collection available at:
https://www.lyellcollection.org/topic/collections/mesozoic-and-cenozoic-tectonics-landscape-and-climate-change
Supplementary material:
https://doi.org/10.6084/m9.figshare.c.6689085
期刊介绍:
Journal of the Geological Society (JGS) is owned and published by the Geological Society of London.
JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed.
Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists.
The journal publishes research and invited review articles, discussion papers and thematic sets.