Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga

doi:10.1016/j.precamres.2019.105524

	Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga
	Liu, He 1,2,3; Sun, Wei-dong1,2,3 ; Deng, Jiang-Hong 1
	2020-02-01
发表期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
卷号	337 页码:5
通讯作者	Sun, Wei-dong([email protected])
摘要	The Archean plate tectonics and subduction-related magmatism have been concerned for several decades. Here we investigate the Archean plate subduction from a new perspective, using the secular records of global-scale non-TTG (tonalite-trondhjemite-granodiorite) felsic rocks with arc-like geochemical affinities. The statistical results show that the La/Yb and Sm/Yb of non-TTG arc felsic rocks evolved at high values in the Archean, and decreased sharply at 2.5 Ga. This abrupt transition indicates a significant change of the petrogenesis. During the Archean, the oceanic crust subducted into the mantle along a high geothermal gradient and reached the conditions of partial melting with garnet stable in the residue, resulting in high La/Yb and Sm/Yb in the arc felsic rocks. As a consequence of the secular cooling of the mantle, the geothermal gradient of a post-Archean subducting cold oceanic crust intersected with the stability limits of hydrous minerals before it reached the wet solidus of basalts, so that the dehydration occurred preferentially and resulted in a drier crust with a much higher temperature of solidus. As such, the post-Archean arc felsic rocks were mostly originated from melting of the hydrated mantle wedge overlying the subducted oceanic slab. The magma source of the arc felsic rocks thereafter became much shallower, corresponding to the low La/Yb and Sm/Yb of those rocks as a consequence of the less stable garnet in the residue. We thus conclude that the subduction-related magmatism changed from slab melting to dehydration model at 2.5 Ga.
关键词	Archean plate subduction Arc felsic rocks Slab melting Dehydration Garnet
DOI	10.1016/j.precamres.2019.105524
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103]; National Key R&D Program of China[2016YFC0600408]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000510527900005
出版者	ELSEVIER
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/165263
专题	深海极端环境与生命过程研究中心
通讯作者	Sun, Wei-dong
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, 7 Nanhai Rd, Qingdao 266071, Peoples R China
第一作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Liu, He,Sun, Wei-dong,Deng, Jiang-Hong. Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga[J]. PRECAMBRIAN RESEARCH,2020,337:5.
APA	Liu, He,Sun, Wei-dong,&Deng, Jiang-Hong.(2020).Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga.PRECAMBRIAN RESEARCH,337,5.
MLA	Liu, He,et al."Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga".PRECAMBRIAN RESEARCH 337(2020):5.

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