气候变化领域集成服务门户(CCPortal): Paleocene Neo-Tethyan slab rollback constrained by A1-type granitic intrusion in the Gaoligong–Tengliang–Yingjiang belt of the Eastern Himalayan Syntaxis; SE Tibet

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DOI	10.1007/s00531-019-01752-4
	Paleocene Neo-Tethyan slab rollback constrained by A1-type granitic intrusion in the Gaoligong–Tengliang–Yingjiang belt of the Eastern Himalayan Syntaxis; SE Tibet
	Liu Z.; Liao S.-Y.; Tan S.-C.; He X.-H.; Wang G.-C.; Wang D.-B.; Zhou Q.
发表日期	2019
ISSN	14373254
起始页码	2113
结束页码	2128
卷号	108 期号:6
英文摘要	Slab rollback is one of the primary processes in shaping tectonic framework. However, in the Tibet–Himalaya orogen, the timing of the Neo-Tethyan slab rollback remains controversial. In this contribution, we investigated an early Paleocene (ca. 62 Ma) A1-type granitic intrusion (South Gongshan) from the Gaoligong–Tengliang–Yingjiang (GTY) area, SE Tibet. It is mainly characterized by high 10,000*Ga/Al ratios (4.0–9.1) and extremely high HFSEs contents (Zr + Nb + Ce + Y = 669–3146 ppm), with relatively low Y/Nb ratios (0.8–1.1). The samples collected from the intrusion exhibit high zircon εHf(t) (+1.1 to +5.7) and whole-rock εNd(t) values (− 0.8 to − 3.1). Geochemical data indicated that it was probably produced by extreme FC of asthenospheric mantle-derived basaltic magmas. Together with results from convergence rate between India and Asia, the emplacement of the South Gongshan intrusion was likely to be associated with a transition from flat to steep subduction triggered by the Neo-Tethyan slab rollback. We proposed that the Neo-Tethyan slab rollback beneath the GTY area might have occurred at ca. 62 Ma. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	A-type granite; Neo-Tethys; Paleocene; SE Tibet; Slab rollback
语种	英语
scopus关键词	A-type rock; granite; Himalayan orogeny; igneous intrusion; Paleocene; slab; subduction; tectonic evolution; zircon; China; Xizang
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147797
作者单位	School of Resource Environment and Earth Science, Yunnan University, Kunming, 650091, China; Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China; Yunnan Key Laboratory For Palaeobiology, Yunnan University, Kunming, 650091, China; Chengdu Center, Chinese Geological Survey, Chengdu, 610081, China
推荐引用方式 GB/T 7714	Liu Z.,Liao S.-Y.,Tan S.-C.,等. Paleocene Neo-Tethyan slab rollback constrained by A1-type granitic intrusion in the Gaoligong–Tengliang–Yingjiang belt of the Eastern Himalayan Syntaxis; SE Tibet[J],2019,108(6).
APA	Liu Z..,Liao S.-Y..,Tan S.-C..,He X.-H..,Wang G.-C..,...&Zhou Q..(2019).Paleocene Neo-Tethyan slab rollback constrained by A1-type granitic intrusion in the Gaoligong–Tengliang–Yingjiang belt of the Eastern Himalayan Syntaxis; SE Tibet.International Journal of Earth Sciences,108(6).
MLA	Liu Z.,et al."Paleocene Neo-Tethyan slab rollback constrained by A1-type granitic intrusion in the Gaoligong–Tengliang–Yingjiang belt of the Eastern Himalayan Syntaxis; SE Tibet".International Journal of Earth Sciences 108.6(2019).