U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution

doi:10.1016/j.gr.2017.06.007

	U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution
	Yan, Quanshu 1,2; Metcalfe, Ian 3; Shi, Xuefa 1,2
刊名	GONDWANA RESEARCH
	2017-09
卷号	49 页码:333-349
关键词	Zircon U-Pb ages Geochemistry Granitic rocks Tectonic evolution Hainan Island South China Sea
ISSN号	1342-937X
DOI	10.1016/j.gr.2017.06.007
英文摘要	Hainan Island is a key component of the South China Sea region and provides insights on regional geological evolution since the Paleozoic. Ten new LA-ICPMS zircon U-Pb ages from granites of Hainan Island include Late Permian (254 +/- 3 Ma; 252 +/- 3 Ma), Middle-Late Triassic (243 +/- 2 Ma; 242 +/- 3 Ma; 240 +/- 2 Ma; 228 +/- 2 Ma) and late Early to early Late Cretaceous (105 +/- 1 Ma; 101 +/- 1 Ma; 96 +/- 2 Ma; 95 +/- 3 Ma) ages. All samples in the present study, including late Permian, Middle-Late Triassic, and late Early to early Late Cretaceous granitic rocks show geochemical characteristics similar to those of talc-alkaline to high-K calc-alkaline 1-type granites. Major and trace element geochemical variations show that during petrogenesis, these granites experienced fractional crystallization of minerals (e.g., Ti oxides and apatite). Compared to the late Permian and Middle-Late Triassic granitic rocks, middle to late Cretaceous granites generally have lower initial Sr-87/Sr-86 ratios of 0.70594 to 0.70886, lower T-DM2 ages of 1314 to 1382 Ma, and higher epsilon Nd(t) of -4.94 to -5.96, implying that the magmatic source for Cretaceous granites received more significant contribution from juvenile material relative to that for Permo-Triassic granites. These new data, combined with data from literature for Hainan Island and the South China Sea (SCS) region underpin a conceptual model for late Paleozoic to Mesozoic tectonic evolution for Hainan Island and the general SCS region as follows, (a) Late Permian (272-252 Ma), the initiation and development of continental arc related to the subduction of Palaeo-Tethys ocean; (b) Triassic (249-228 Ma), continued arc magmatism, the gradual cessation of Palaeo-Tethys subduction and subsequent development of an extensional setting; (c) Early Jurassic to early Cretaceous (190-130 Ma), the development of an Andean-type continental arc, and regional tectonic regime switch to the westward subduction of the Palaeo-Pacific plate; (d) Middle to late Cretaceous (128-70 Ma), the continuation of the Andean-type arc, the development of an extensional setting due to slab roll-back, and the cessation (similar to 70 Ma) of Palaeo-Pacific plate subduction. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
资助项目	FIO[2016S01]
WOS关键词	PALAWAN CONTINENTAL TERRANE ; TRACE-ELEMENT COMPOSITION ; WESTERN PACIFIC ; VOLCANIC-ROCKS ; IGNEOUS ROCKS ; DALAT ZONE ; TECTONOMAGMATIC EVOLUTION ; LITHOSPHERIC EXTENSION ; SPATIAL-DISTRIBUTION ; SOUTHEASTERN CHINA
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000414383200017
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26366]
专题	自然资源部第一海洋研究所
通讯作者	Yan, Quanshu; Shi, Xuefa
作者单位	1.SOA, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia
推荐引用方式 GB/T 7714	Yan, Quanshu,Metcalfe, Ian,Shi, Xuefa. U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution[J]. GONDWANA RESEARCH,2017,49:333-349.
APA	Yan, Quanshu,Metcalfe, Ian,&Shi, Xuefa.(2017).U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution.GONDWANA RESEARCH,49,333-349.
MLA	Yan, Quanshu,et al."U-Pb isotope geochronology and geochemistry of granites from Hainan Island (northern South China Sea margin): Constraints on late Paleozoic-Mesozoic tectonic evolution".GONDWANA RESEARCH 49(2017):333-349.