气候变化领域集成服务门户(CCPortal): Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation

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DOI	10.1038/s43247-023-01007-w
	Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation
	Guilmette, Carl; van Hinsbergen, Douwe J. J.; Smit, Matthijs A.; Godet, Antoine; Fournier-Roy, Francois; Butler, Jared P.; Maffione, Marco; Li, Shun; Hodges, Kip
发表日期	2023
EISSN	2662-4435
卷号	4 期号:1
英文摘要	Metamorphic soles found under allochthonous oceanic lithosphere, or ophiolites, are interpreted as derived from lower plate oceanic crust material accreted to upper plate mantle during intraoceanic subduction initiation. Their metamorphic evolution is inferred to reflect the thermal structure at the site of subduction nucleation, with granulite-bearing soles linked to initiation at hot spreading centers. Here we present garnet Lu-Hf geochronology for the granulite-bearing sole of the Xigaze ophiolite in South Tibet, whose oceanic crust formed similar to 130 Ma through continental forearc extension. Our study shows that sole metamorphism was ongoing by 144 Ma, implying that north-directed subduction began at least 14 million years before oceanic forearc spreading. The upper plate at the time of subduction initiation was thus continental, not oceanic. Our results demonstrate that metamorphic characteristics of soles are independent of the specific tectonic setting at the subduction nucleation site and rather provide generic constraints on the subduction initiation process. The metamorphism of granulite-bearing metamorphic soles may initiate prior to the forearc extension that generated the ophiolites above them, according to garnet Lu-Hf geochronology from the sole of the Xigaze ophiolite, South Tibet
英文关键词	ZANGBO SUTURE ZONE; YARLUNG-TSANGPO SUTURE; SOUTHERN TIBET; SEMAIL-OPHIOLITE; LU-HF; GARNET GEOCHRONOLOGY; MAFIC ROCKS; NEO-TETHYS; ARC; GEOCHEMISTRY
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001074877500001
来源期刊	COMMUNICATIONS EARTH & ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283498
作者单位	Laval University; Utrecht University; University of British Columbia; Natural Resources Canada; Lands & Minerals Sector - Natural Resources Canada; Geological Survey of Canada; University of Birmingham; Shanghai Jiao Tong University; Arizona State University; Arizona State University-Tempe
推荐引用方式 GB/T 7714	Guilmette, Carl,van Hinsbergen, Douwe J. J.,Smit, Matthijs A.,et al. Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation[J],2023,4(1).
APA	Guilmette, Carl.,van Hinsbergen, Douwe J. J..,Smit, Matthijs A..,Godet, Antoine.,Fournier-Roy, Francois.,...&Hodges, Kip.(2023).Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation.COMMUNICATIONS EARTH & ENVIRONMENT,4(1).
MLA	Guilmette, Carl,et al."Formation of the Xigaze Metamorphic Sole under Tibetan continental lithosphere reveals generic characteristics of subduction initiation".COMMUNICATIONS EARTH & ENVIRONMENT 4.1(2023).