气候变化领域集成服务门户(CCPortal): Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens

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DOI	10.1016/j.lithos.2021.105969
	Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens
	Li, Jialiang; Liu, Jingao; Wang, Yujian; Zhu, Di-Cheng; Wu, Chen
通讯作者	Liu, JA (通讯作者)
发表日期	2021
ISSN	0024-4937
EISSN	1872-6143
卷号	384
英文摘要	The Central Asian Orogenic Belt (CAOB) was established in response to multiple subduction-accretion-collision processes. However, the origin and evolution of the accreted arc terranes remain unclear, as exemplified by the question how ancient and juvenile materials were accreted and constructed in the accretionary belts. This question is addressed here by presenting in-situ zircon U-Pb and Hf isotopic, whole-rock elemental and Sr-Nd isotopic analyses of the four Late Paleozoic igneous rock units from Xilinhot in the southeastern CAOB. The new geochronological and geochemical data support the existence of two Late Carboniferous to Permian magmatic arc systems - Ulistai active continental margin and Baolidao arc belt. These arc systems are characterized by magmatic activity extending from 330 to 250 Ma, with two magmatic flare-ups (325-295 Ma vs. 295-270 Ma). The first magmatic flare-up (325-295 Ma) includes high-K calc-alkaline rhyolites, dacites and alkali-feldspar granites, which can be interpreted to have originated from re-melting of the juvenile lower crust beneath a continental arc induced by the Paleo-Asian oceanic ridge subduction. The second magmatic flare-up (295-270 Ma) reveals a seaward migration of magmatism due to slab rollback subsequent to ridge subduction. The Middle to Late Permian shoshonitic andesites witnessed the closure of the Hegenshan ocean during this period. In combination with previously reported Sr-Nd-Hf isotopic data, we suggest that the Baolidao arc belt and some other arc terranes (e.g., Bainaimiao arc) in the southeastern CAOB were built upon Precambrian microcontinents that have been largely fragmented and significantly reworked. In summary, ridge subduction accompanied by slab rollback played an important role in the rejuvenation of microcontinents and accretion of arc terranes in the southeastern CAOB. (C) 2021 Elsevier B.V. All rights reserved.
关键词	CENTRAL INNER-MONGOLIA A-TYPE GRANITES ALKALINE VOLCANIC-ROCKS NORTH CHINA U-PB TECTONIC IMPLICATIONS ISOTOPIC EVIDENCE TRACE-ELEMENT SLAB BREAKOFF ARC
英文关键词	Central Asian Orogenic Belt; Ridge subduction; Slab rollback; Baolidao arc belt; Crustal growth
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000652195000013
来源期刊	LITHOS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260129
推荐引用方式 GB/T 7714	Li, Jialiang,Liu, Jingao,Wang, Yujian,et al. Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens[J]. 中国科学院青藏高原研究所,2021,384.
APA	Li, Jialiang,Liu, Jingao,Wang, Yujian,Zhu, Di-Cheng,&Wu, Chen.(2021).Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens.LITHOS,384.
MLA	Li, Jialiang,et al."Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens".LITHOS 384(2021).