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Transition of subduction-related magmatism from slab melting to dehydration at 2.5 Ga
Liu, He1,2,3; Sun, Wei-dong1,2,3; Deng, Jiang-Hong1
2020-02-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume337Pages:5
Corresponding AuthorSun, Wei-dong(weidongsun@qdio.ac.cn)
AbstractThe 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.
KeywordArchean plate subduction Arc felsic rocks Slab melting Dehydration Garnet
DOI10.1016/j.precamres.2019.105524
Indexed BySCI
Language英语
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103] ; National Key R&D Program of China[2016YFC0600408]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000510527900005
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/165263
Collection深海极端环境与生命过程研究中心
Corresponding AuthorSun, Wei-dong
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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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