气候变化领域集成服务门户(CCPortal): The generation and reworking of continental crust during early Paleozoic in Gondwanan affinity terranes from the Tibet Plateau

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DOI	10.1016/j.earscirev.2019.01.019
	The generation and reworking of continental crust during early Paleozoic in Gondwanan affinity terranes from the Tibet Plateau
	Liu Y.; Li S.; Santosh M.; Cao H.; Yu S.; Wang Y.; Zhou J.; Zhou Z.
发表日期	2019
ISSN	0012-9035
起始页码	486
结束页码	497
卷号	190
英文摘要	The central–south Tibet Plateau represents an important part of the northern segment of the Gondwana supercontinent during the early Paleozoic. Here, we statistically analyze the Lu–Hf isotopic data of Phanerozoic granitoids from this area, with a view to gain insights on the early Paleozoic geotectonic evolution of the Gondwana northern margin. The zircon Lu–Hf data from Phanerozoic granitoids, combined with the field evidence, provide insights into the involvement of Paleo-Mesoproterozoic crustal materials in the Tibet Plateau. The variable zircon Hf isotopic data, dominated by negative ε Hf (t) values, of the early Paleozoic granitoids reveal the temporal and spatial heterogeneities of Paleo-Mesoproterozoic continental crust. Our results suggest that crust formation occurred at ~1.7 Ga, ~1.4–1.6 Ga, ~1.1–1.3 Ga, ~0.8 Ga, ~0.5–0.6 Ga, and ~0.3 Ga. A large volume of early Paleozoic juvenile crusts in the Lhasa and Himalaya terranes are identified, whereas the south Qiangtang terrane and east Tibet are dominated by ancient crust. In addition, the reworking of ancient crust plays an important role throughout the Phanerozoic evolution of the Tibet Plateau. Reworking of old crust occurs mainly in advancing accretionary orogens and internal collisional orogens. However, the subduction-related magmatism resulted in marked excursions of zircon Hf isotopic composition toward depleted mantle-like features, which produced positive ε Hf (t) values. Postcollisional magmatism associated with delamination, orogenic collapse, or lithospheric extension leads to melting of the underthrust continental fragment, thereby driving zircon ε Hf (t) to negative values. In addition, the collapse and eventual rifting of the continental crust are generally accompanied by relatively minor volumes of mafic magmatism and crustal generation, which is consistent with our inferences. Therefore, we concluded that the Cambrian–Ordovician magmatic rocks from the central–south Tibet Plateau might have developed within a postcollision extensional, or even an eventual rift setting, following the Pan-African orogenesis. © 2019 Elsevier B.V.
英文关键词	Early Paleozoic granitoids; Gondwana; Lu–Hf isotopes; Tibet Plateau
语种	英语
scopus关键词	continental crust; dating method; Gondwana; granitoid; magmatism; Paleozoic; subduction; terrane; China; Qinghai-Xizang Plateau
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209944
作者单位	Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Mineral Resources, Laboratory for Marine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China; Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia
推荐引用方式 GB/T 7714	Liu Y.,Li S.,Santosh M.,et al. The generation and reworking of continental crust during early Paleozoic in Gondwanan affinity terranes from the Tibet Plateau[J],2019,190.
APA	Liu Y..,Li S..,Santosh M..,Cao H..,Yu S..,...&Zhou Z..(2019).The generation and reworking of continental crust during early Paleozoic in Gondwanan affinity terranes from the Tibet Plateau.EARTH-SCIENCE REVIEWS,190.
MLA	Liu Y.,et al."The generation and reworking of continental crust during early Paleozoic in Gondwanan affinity terranes from the Tibet Plateau".EARTH-SCIENCE REVIEWS 190(2019).