Sediment recycling and adakite petrogenesis: Constraints from the late Ordovician tonalite in the North Qilian suture zone

doi:10.1016/j.chemgeo.2023.121389

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	Sediment recycling and adakite petrogenesis: Constraints from the late Ordovician tonalite in the North Qilian suture zone
	Chen, Yuxiao 4,5; Cui, Ying 4; Zhang, Lipeng 1; Fu, Shanming 5; Wu, Kai 3; Song, Shuguang 4; Sun, Weidong 1,2; Xiao, Tangfu 5
刊名	CHEMICAL GEOLOGY
	2023-05-05
卷号	624 页码:13
关键词	Sediment recycling Adakite Inherited zircon Oxygen isotope Hafnium isotope North Qilian suture zone
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2023.121389
通讯作者	Chen, Yuxiao(chyxiao@gzhu.edu.cn) ; Wu, Kai(wukai@nwu.edu.cn)
英文摘要	Deciphering the slab melt contribution to arc igneous rocks in orogenic belts is of great importance for unraveling the fate of subducted slabs, adakite petrogenesis and geochemical recycling process. The fact of subducted slabs, particularly how different sections of the oceanic crust including its overlying sediment react during slab melting, remains poorly understood. Here we present a detailed study of the Leigongshan (LGS) tonalite pluton in the eastern section of the North Qilian suture zone (NQSZ). The tonalites are geochemically similar to low-Mg adakitic rocks characterized by high Sr/Y and (La/Yb)N ratios with low MgO, Cr, and Ni concentrations, indicating limited/no mantle interaction. They exhibit moderately radiogenic Sr, Nd, and Pb isotope compositions with initial 87Sr/86Sr ratio of 0.706216-0.708267, & epsilon;Nd(t) value of -0.7 to -2.1 and (206Pb/204Pb)t of 18.52-18.90, most likely a mixed melt derived from the mafic oceanic crust plus ca. 10-25% overlying sediments. Morphology, internal structure, and U-Pb dating of zircon crystals indicate a common preservation of old cores aged at ca. 470-2733 Ma. The sharp truncation of core zoning and embayed boundaries with the rims further indicate that the cores are probably clastic, abraded materials inherited from a (meta)sedimentary precursor from which the tonalitic magma was derived. The younger mean ages of ca. 453-450 Ma are interpreted as the emplacement age of the pluton. They have & epsilon;Hf (t) values of +0.5-7.0 and & delta;18OZrc values of 4.9%o to 8.7%o, which somewhat deviate from those of the parent mafic oceanic crust, indicating the involvement of subducted sediments as well. The LGS adakitic tonalite represents mixed melts of the subducted slab including the overlying sediment that accounts for the enriched Sr-Nd-Pb isotope compositions. Future detailed research on the zircons of adakite/adakitic rocks would provide new important clues on their petrogenesis.
资助项目	National Natural Science Foundation of China[41903022] ; National Natural Science Foundation of China[91955202] ; Foundation of Guangzhou City[202201010468] ; Earth Critical Zone and and Eco-geochemistry[PT252022024]
WOS关键词	CHILE TRIPLE JUNCTION ; ZIRCON U-PB ; OXYGEN-ISOTOPE EVIDENCE ; TAITAO PENINSULA ; VOLCANIC-ROCKS ; NW CHINA ; GEOCHEMICAL CONSTRAINTS ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; METAMORPHIC BELT
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001030072000001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/182589]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Chen, Yuxiao; Wu, Kai
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Qingdao Pilot Natl Lab Marine Sci & Technol, Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 4.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 5.Guangzhou Univ, Sch Environm Sci & Engn, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yuxiao,Cui, Ying,Zhang, Lipeng,et al. Sediment recycling and adakite petrogenesis: Constraints from the late Ordovician tonalite in the North Qilian suture zone[J]. CHEMICAL GEOLOGY,2023,624:13.
APA	Chen, Yuxiao.,Cui, Ying.,Zhang, Lipeng.,Fu, Shanming.,Wu, Kai.,...&Xiao, Tangfu.(2023).Sediment recycling and adakite petrogenesis: Constraints from the late Ordovician tonalite in the North Qilian suture zone.CHEMICAL GEOLOGY,624,13.
MLA	Chen, Yuxiao,et al."Sediment recycling and adakite petrogenesis: Constraints from the late Ordovician tonalite in the North Qilian suture zone".CHEMICAL GEOLOGY 624(2023):13.