马来西亚半岛东部大陆裂谷作用的多个阶段：侏罗纪-白垩纪花岗岩的新见解

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of the Geological Society Pub Date : 2023-06-19 DOI:10.1144/jgs2023-025

Xin Qian, Tianxing Bai, Yongqi Yu, K. A. Mustapha, Thomas C. Sheldrick, Chengshi Gan, Yuejun Wang

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引用次数: 1

摘要

马来西亚半岛的中生代花岗质岩石为特提斯和古太平洋地区之间的时空关系提供了重要信息。本文介绍了新发现的东马来亚侏罗纪-白垩纪花岗岩和变质花岗岩的新时代和地球化学数据。这些花岗岩类可分为三类。第1组高钾钙碱性花岗岩和花岗闪长岩（171–162 Ma）的εNd（t）值为−7.4–+0.5，锆石εHf（t。尽管具有A型亲和力的第2组花岗斑岩（~131Ma）和具有I型亲和力的第一组花岗片麻岩（~130Ma）具有相似的εNd（t）值（−5.5–−7.2）、锆石εHf（t）（−10.1–+6.5）和206 Pb/204 Pb的初始比值（18.81–19.02），207 Pb/204 Pb（15.71–15.77）和208 Pb/204 Pb38.95–39.95。所有这些花岗质岩石都类似于东马来亚的二叠纪-三叠纪火成岩。马来西亚半岛东部的侏罗纪-白垩纪火成岩是在大陆裂谷的多个阶段形成的，这是对古太平洋板块回滚的响应，而不是特提斯演化过程。主题收藏：本文是中新生代构造、景观和气候变化收藏的一部分，可在以下网站获取：https://www.lyellcollection.org/topic/collections/mesozoic-and-cenozoic-tectonics-landscape-and-climate-change补充材料：https://doi.org/10.6084/m9.figshare.c.6689085

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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

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来源期刊

Journal of the Geological Society 地学-地球科学综合

CiteScore

6.00

自引率

3.70%

发文量

审稿时长

6-12 weeks

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.