DOI: 10.1007/s00531-016-1391-3
Scopus记录号: 2-s2.0-84986268661
论文题名: Early Cretaceous (ca. 100 Ma) magmatism in the southern Qiangtang subterrane, central Tibet: Product of slab break-off?
作者: Li Y. ; He H. ; Wang C. ; Wei Y. ; Chen X. ; He J. ; Ning Z. ; Zhou A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 4 起始页码: 1289
结束页码: 1310
语种: 英语
英文关键词: Bangong–Nujiang Ocean
; Early Cretaceous
; Qiangtang Terrane
; Slab break-off
; Tibet
英文摘要:
The lack of Early Cretaceous magmatic records with high-quality geochemical data in the southern Qiangtang subterrane has inhibited a complete understanding of the magmatic processes and geological evolution of central Tibet. In this study, we present zircon U–Pb ages, whole-rock geochemistry, and Sr–Nd–Pb and zircon Hf isotopic data for the newly discovered Moku pluton in the southern Qiangtang subterrane. Zircon U–Pb dating reveals that the Moku granites were emplaced in the Early Cretaceous (ca. 100 Ma) and are coeval with the hosted dioritic enclaves. The granites are slightly peraluminous and high-K calc-alkaline I-type granites and characterized by initial (87Sr/86Sr)i ratios of 0.70605–0.70658, negative εNd(t) values (−4.44 to −3.35), and Nd isotopic model ages of 1.19–1.29 Ga. The granites have a wide range of zircon εHf(t) values (−24.4 to 2.6) and concordant ratios of (206Pb/204Pb)t = 18.645–18.711, (207Pb/204Pb)t = 15.656–15.666, and (208Pb/204Pb)t = 38.751–38.836. The coeval dioritic enclaves are medium- to high-K calc-alkaline rocks with zircon εHf(t) values of −13.3 to +3.6. The geochemical signatures of the host granites and coeval dioritic enclaves indicate that the Moku pluton was most likely generated by partial melting of the ancient lower crust with contributions from mantle-derived melts. Our new data, together with other recently published data, indicate that the ca. 100 Ma magmatic rocks were derived from anatexis of the Qiangtang lower crust that mixed with upwelling asthenosphere materials in response to the slab break-off of the northward subduction of the Bangong–Nujiang oceanic lithosphere. © 2016, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84986268661&doi=10.1007%2fs00531-016-1391-3&partnerID=40&md5=83729ddbeda24235e2855adeb9f7d6f9
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70033
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
File Name/ File Size
Content Type
Version
Access
License
10.1007%2Fs00531-016-1391-3.pdf (1685KB) 期刊论文 作者接受稿 开放获取 View
Download
作者单位: State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences and Resources, China University of Geosciences, Beijing, China; Chengdu Institute of Geology and Mineral Resources, Chengdu, China
Recommended Citation:
Li Y.,He H.,Wang C.,et al. Early Cretaceous (ca. 100 Ma) magmatism in the southern Qiangtang subterrane, central Tibet: Product of slab break-off?[J]. International Journal of Earth Sciences,2017-01-01,106(4)