气候变化领域集成服务门户(CCPortal): Rifting and subduction records of the Paleo-Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone

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DOI	10.1130/B35537.1
	Rifting and subduction records of the Paleo-Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone
	Zhang Y.; Yang X.; Wang Y.; Qian X.; Wang Y.; Gou Q.; Senebouttalath V.; Zhang A.
发表日期	2021
ISSN	167606
起始页码	212
结束页码	232
卷号	133 期号:2021-01-02
英文摘要	In Southeast Asia, the Jinshajiang-Ailaoshan suture in Southwest China and the Song Ma zone in Vietnam were generally accepted as the amalgamation boundary of the South China and Simao/Indochina blocks. However, the tectonic location of the Paleo-tethyan suture in North Laos and its tectonic affinity remain ambiguous. To address this issue, we present the geochemical and geo-chronological data of a set of mafic and pla-giogranitic rocks along the Song Ma suture zone in North Laos. Three groups of rocks with distinctive petrological, geochronologi-cal, and geochemical signatures were identified. The ca. 370 Ma Group 1 plagioclase amphibolite was preserved as xenoliths in the ca. 260 Ma granitoids. It exhibits a normal mid-oceanic-ridge basalt (N-MORB)-like, multi-elemental pattern with highly positive £Nd(l)(+3.3 to +10.7) and £Hf(Z) (+6.68 to +7.41) values and low 818O values (5.3%<⇔5.5%o), that are interpreted as products of the Late Devonian - earliest Carboniferous continental rift setting. The ca. 270 Ma Group 2 gabbro/ diabase-diorite exhibits arc-like geochemical affinity with the £Nd(0, EhM and 818O values of -5.85 to -3.76, -3.8 to +3.2, and 6.6%<⇔7.6%o, respectively. It is derived from the metasomatized wedge. The ca. 260 Ma Group 3 plagiogranite shows Nb-Ta and Ti negative anomalies and positive En(I
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184712
作者单位	Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)519082, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Laboratory of Ocean and Coast Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
推荐引用方式 GB/T 7714	Zhang Y.,Yang X.,Wang Y.,et al. Rifting and subduction records of the Paleo-Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone[J],2021,133(2021-01-02).
APA	Zhang Y..,Yang X..,Wang Y..,Qian X..,Wang Y..,...&Zhang A..(2021).Rifting and subduction records of the Paleo-Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone.Bulletin of the Geological Society of America,133(2021-01-02).
MLA	Zhang Y.,et al."Rifting and subduction records of the Paleo-Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone".Bulletin of the Geological Society of America 133.2021-01-02(2021).