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Tearing on the southward subducting Kelameili oceanic lithosphere in the early Devonian: Evidence from the magmatism in the Harlik arc, southern Altaids

文献类型：期刊论文

作者Li, Liang3; Xiao, Wenjiao1,2,6; Zhao, Guochun3,5; Yang, He2; Han, Yigui3; Wang, Kai1,2,4; Gan, Jingmin1,2
刊名LITHOS
出版日期2023-10-01
卷号454页码:18
关键词Harlik arc Slab rollback Slab tear Adakites Nb-enriched basaltic magmas
ISSN号0024-4937
DOI10.1016/j.lithos.2023.107279
英文摘要The coexistence of adakites, high-Mg andesites (HMAs) and Nb-enriched basalts (NEBs) records special subduction geodynamics, for instance, subduction initiation, subduction of oceanic ridges or slab tearing, which are widespread in the circum-Pacific subduction zone. The Altaids in Central Asia shared similar tectonic evolution to the western Pacific. However, slab tearing has not been widely reported, which hinders a better comparison between the Altaids and the western Pacific. In this study, we report the contemporaneous early Devonian granodiorites and mafic microgranular enclaves (MMEs) in the Sidingheishan area of the Harlik arc, southern Altaids. The granodiorites have high Sr (534-683 ppm) but low Y (7.79-10.2 ppm) and Yb (0.71-1.68 ppm) contents, with corresponding high Sr/Y values (29.78-76.93). In combination with their juvenile isotopes (initial 87Sr/86Sr = 0.70333-0.70356, & epsilon;Nd(t) = +7.4 - +8.01) and high Mg# numbers (50.9-53), they indicate that their primitive magmas were derived from slab melting. The MMEs show similarly high Sr contents (507-696 ppm), and identically juvenile isotopic signatures (initial 87Sr/86Sr = 0.70346-0.70356, & epsilon;Nd(t) = +7.14 - +7.5) to their host granodiorites. However, their relatively low silica contents (55-60 wt%), evolved Mg# numbers (44.8-55.2) and high Nb contents (12.7-24.7 ppm) demonstrate that they are the fractionation products of NEBs, which were produced by the partial melting of the mantle that was previously metasomatized by these adakitic magmas. Considering all the available evidence, we propose a slab tearing model in which the southward subducting Kelameili oceanic lithosphere underneath the Harlik arc underwent rollback in the early Devonian and its differential rollback rates caused slab tearing. Subsequent asthenosphere upwelling stimulated the Kelameili oceanic lithosphere to melt, producing the adakitic magmas, some of which intruded the crust after limited interaction with the mantle peridotites and underwent crystallization of dominant amphibole in the crust. The rest reacted completely with the mantle peridotites, which underwent further melting to produce the Nb-enriched basaltic magmas. They intruded into the adakitic magma chamber after fractional crystallization of olivine, clinopyroxene and garnet in the deep, forming the MMEs and promoting the remobilization of those hornblendites. This study reveals the development of slab tearing that are closely associated with slab rollback in the Altaids, providing further evidence that argues for the similarity between the Altaids and the western Pacific.
WOS关键词PHANEROZOIC CRUSTAL GROWTH ; EASTERN TIANSHAN ; OROGENIC BELT ; KANGGUERTAGE OPHIOLITE ; WESTERN CHINA ; ASIAN OCEAN ; ADAKITES ; ACCRETIONARY ; EVOLUTION ; ISLAND
资助项目National Natural Science Foundation of China[42202236] ; National Natural Science Foundation of China[41730213] ; National Natural Science Foundation of China[41890831] ; Hong Kong RGC GRF[17307918] ; HKU Internal Grants for Member of Chinese Academy of Sciences[102009906] ; HKU Internal Grants for Member of Chinese Academy of Sciences[102010100] ; China Postdoctoral Science Foundation[2022M722565] ; International Partnership Program of Chinese Academy of Sciences[131551KYSB20200021] ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China[2021A03001] ; Xinjiang Uygur Autonomous Region, China[2020D04041]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001045733700001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; Hong Kong RGC GRF ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; HKU Internal Grants for Member of Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China ; Xinjiang Uygur Autonomous Region, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111354]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Li, Liang; Xiao, Wenjiao
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
4.Xian Ctr Geol Survey, Key Lab Study Focused Magmatism & Giant Ore Deposi, China Geol Survey, Xian 710054, Peoples R China
5.Univ Hongkong, Dept Earth Sci, Hongkong, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, Liang,Xiao, Wenjiao,Zhao, Guochun,et al. Tearing on the southward subducting Kelameili oceanic lithosphere in the early Devonian: Evidence from the magmatism in the Harlik arc, southern Altaids[J]. LITHOS,2023,454:18.
APA Li, Liang.,Xiao, Wenjiao.,Zhao, Guochun.,Yang, He.,Han, Yigui.,...&Gan, Jingmin.(2023).Tearing on the southward subducting Kelameili oceanic lithosphere in the early Devonian: Evidence from the magmatism in the Harlik arc, southern Altaids.LITHOS,454,18.
MLA Li, Liang,et al."Tearing on the southward subducting Kelameili oceanic lithosphere in the early Devonian: Evidence from the magmatism in the Harlik arc, southern Altaids".LITHOS 454(2023):18.

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来源：地质与地球物理研究所

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