Timing and nature of the Jinshajiang Paleo-Tethys: Constraints from zircon U-Pb age and Hf isotope of the Dongzhulin layered gabbro from Jinshajiang ophiolite belt, northwestern Yunnan

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	Timing and nature of the Jinshajiang Paleo-Tethys: Constraints from zircon U-Pb age and Hf isotope of the Dongzhulin layered gabbro from Jinshajiang ophiolite belt, northwestern Yunnan
	Wang, DB (Wang DongBing); Wang, LQ (Wang LiQuan); Yin, FG (Yin FuGuang); Sun, ZM (Sun ZhiMing); Wang, BD (Wang BaoDi); Zhang, WP (Zhang WanPing)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:5 页码:1542-1550
关键词	Layered gabbro Jinshajiang ophiolite belt Zircon U-Pb dating Hf isotope Paleo-Tethys
ISSN号	1000-0569
英文摘要	The Jinshajiang ophiolite belt is generally regarded as one of the Paleo-Tethys sutures in northwestern Yunnan. Zircon U-Pb age and Hf isotope of one layered gabbro collected from Dongzhulin in the Jinshajiang ophiolite belt were studied, aiming to constrain the timing and nature of the Jinshajiang Paleo-Tethys oceanic basin. LA-ICP-MS zircon U-Pb dating results yield a weighted mean Pb-206/U-238 age of 354 +/- 3Ma for the Dongzhulin layered gabbro, indicating that the Jinshajiang Paleo-Tethys oceanic lithosphere formed in the earliest Carboniferous. Zircon from the Dongzhulin layered gabbro exhibits a narrow range of initial Hf isotope ratios (epsilon(Hf)(t) = 10. 3 similar to 12. 6), with corresponding t(DMI) of 478 similar to 576Ma. The epsilon(Hf)(t) values are obviously lower than that of depleted mantle reservoir at 354Ma and the t(DMI) are obviously older than the timing of zircon growth, suggesting that their source is metasomatic mantle rather than N-MORB-like depleted mantle. Early subduction of Tethys, which could carry crustal components to the mantle, might responsible for the character of the Jinshajiang Paleo-Tethys mantle. These features, combined with the tectonic framework and spatial allocation of the archipelagic arc basin systems on the Nujiang-Lancangjiang-Jinshajiang area, southwestern China, suggest that the Jinshajiang Paleo-Tethys was mostly produced in a back-arc basin. Consequently, the Jinshajiang Paleo-Tethys was not the main ocean of the Paleo-Tethys, but an important branch of the Paleo-Tethys that once separated the Zhongzan-Zhongdian block and Changdu-Simao block.
学科主题	地质年代学
WOS关键词	ARC/BACK-ARC ASSEMBLAGES ; PLATE TECTONIC CYCLE ; LA-ICP-MS ; TRACE-ELEMENT ; IGNEOUS ROCKS ; LU-HF ; CHINA ; MANTLE ; OROGEN ; GEOCHEMISTRY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000304784400016
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39501]
专题	中国地质调查局
作者单位	Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Peoples R China
推荐引用方式 GB/T 7714	Wang, DB ,Wang, LQ ,Yin, FG ,et al. Timing and nature of the Jinshajiang Paleo-Tethys: Constraints from zircon U-Pb age and Hf isotope of the Dongzhulin layered gabbro from Jinshajiang ophiolite belt, northwestern Yunnan[J]. ACTA PETROLOGICA SINICA,2012,28(5):1542-1550.
APA	Wang, DB ,Wang, LQ ,Yin, FG ,Sun, ZM ,Wang, BD ,&Zhang, WP .(2012).Timing and nature of the Jinshajiang Paleo-Tethys: Constraints from zircon U-Pb age and Hf isotope of the Dongzhulin layered gabbro from Jinshajiang ophiolite belt, northwestern Yunnan.ACTA PETROLOGICA SINICA,28(5),1542-1550.
MLA	Wang, DB ,et al."Timing and nature of the Jinshajiang Paleo-Tethys: Constraints from zircon U-Pb age and Hf isotope of the Dongzhulin layered gabbro from Jinshajiang ophiolite belt, northwestern Yunnan".ACTA PETROLOGICA SINICA 28.5(2012):1542-1550.