Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau

doi:10.1016/j.lithos.2023.107276

	Hao, Lu-Lu 1,2; Kerr, Andrew C.3; Wang, Qiang1,2,4 ; Ma, Lin1,2 ; Qi, Yue 1,2; Xiao, Ming 1; Ou, Quan 5
	Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau
Source Publication	LITHOS
ISSN	0024-4937
	2023-10-01
Volume	454 Pages:13
DOI	10.1016/j.lithos.2023.107276
Language	英语
WOS Research Area	Geochemistry & Geophysics ; Mineralogy
Abstract	The question of whether subducted continental crust can be recycled into post-collisional magmatism in continental collisional zones remains controversial. Post-collisional mantle-derived ultrapotassic rocks are widespread in western part of central Lhasa block (WCL) of the Tibet-Himalaya orogen and show arc-type trace-element signatures and very enriched Sr-Nd isotopes, which have been explained by the recycling of subducted Indian continental crust. However, due to the lack of late Cretaceous mafic magmatism in the WCL, the nature of the ancient subcontinental lithospheric mantle (SCLM) beneath the WCL has not been well constrained. It is therefore still unclear whether the enriched components of these ultrapotassic rocks were derived from subducted Indian continental crust or inherited from the ancient SCLM. Here we report the mafic dykes from the TangraYumco area in the WCL, which formed at similar to 90 Ma (whole-rock Ar-40-Ar-39, and zircon and titanite U-Pb ages). The diabase-porphyrites and diorite-porphyrites are similar to intraplate Nb-enriched basalts and magnesium adakitic rocks, respectively. This rock association reveals the lithospheric foundering process. Furthermore, the diabase-porphyrites generated by the interaction between the ancient SCLM and asthenosphere provide important constraints on the nature of the ancient SCLM, which shows distinct Nd isotopes to the postcollisional ultrapotassic rocks. In addition, the NW Lhasa block was in a rear-arc environment since the late Cretaceous and thus this SCLM was not significantly influenced by the ongoing northward subduction of the Indus-YarlungZangbu Neo-Tethys ocean. Finally, we propose that the post-collisional ultrapotassic rocks cannot be sourced from the ancient SCLM, but instead were derived from a relatively depleted mantle (e.g., juvenile lithospheric mantle) metasomatized by subducted Indian continental crust. Thus, this study confirms the recycling of subducted continental materials in continental collisional orogens.
Keyword	Lithosphere-asthenosphere interaction Late Cretaceous mafic dykes Adakitic rocks Tibetan plateau Indian continental subduction Crustal recycling
WOS ID	WOS:001046885000001
Indexed By	SCI
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.gig.ac.cn/handle/344008/74668
Collection	同位素地球化学国家重点实验室
Corresponding Author	Hao, Lu-Lu; Wang, Qiang
Affiliation	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales 4.Univ CAS, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 5.Chengdu Univ Technol, Inst Sedimentary Geol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China
Recommended Citation GB/T 7714	Hao, Lu-Lu,Kerr, Andrew C.,Wang, Qiang,et al. Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau[J]. LITHOS,2023,454:13.
APA	Hao, Lu-Lu.,Kerr, Andrew C..,Wang, Qiang.,Ma, Lin.,Qi, Yue.,...&Ou, Quan.(2023).Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau.LITHOS,454,13.
MLA	Hao, Lu-Lu,et al."Recycling of subducted Indian continental crust constrained by late Cretaceous mafic dykes in Central Lhasa block of the Tibetan plateau".LITHOS 454(2023):13.

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