Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics

doi:10.1002/gj.3484

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	Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics
	Liu, He 1,2,3; Sun, Wei-dong 1,2,3; Deng, Jianghong 1,2,3
刊名	GEOLOGICAL JOURNAL
	2020
卷号	55 期号:1 页码:994-1002
关键词	continental basaltic rocks garnet geotherm plate tectonics statistical analysis
ISSN号	0072-1050
DOI	10.1002/gj.3484
通讯作者	Sun, Wei-dong(weidongsun@qdio.ac.cn)
英文摘要	In recent years, application of statistical analysis to a sufficiently large geochemical database has become more and more popular to reveal the onset and evolution of plate tectonics as a consequence of the development of computer science and storage technology. Here, we introduce a robust statistical method to process a filtered geochemical dataset including predominantly continental basaltic rocks through Earth's history. The results show that the average Sr concentrations gradually increased from 3.8 to 0 Ga, indicating a progressively growing depth of magma source as a result of secular cooling of the mantle. However, the average La/Yb and Sm/Yb ratios only started to increase at ca. 3.0 Ga. Considering the La-Yb and Sm-Yb fractionations are commonly attributed to the residual garnet crystallization, we interpreted that the geotherm of the magma source of continental basaltic rocks before 3.0 Ga might be higher than the stability limit of garnet. As such, there were little or no garnets in the residue during partial melting of the upwelling asthenospheric mantle or mantle plumes before 3.0 Ga, which also implied a higher continental geotherm during that time. Such a high geotherm could not support the formation of contemporaneous high-pressure or medium-pressure TTGs (tonalite-trondhjemite-granodiorite) by vertical tectonic models associated with upwelling mantle heating or delaminated lower crust melting in the early Archean. We therefore conclude that the plate tectonics had occurred by ca. 3.8 Ga in a hot subduction style and contributed to the formations of high- and medium-pressure TTGs subsequently.
资助项目	NSFC[41473029] ; NSFC[41421062] ; NSFC[91328204] ; CAS[XDB18020000] ; MOST of China[2016YFC0600408]
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000508025400057
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/164415]
专题	海洋研究所_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 Ocean Megasci, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Liu, He,Sun, Wei-dong,Deng, Jianghong. Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics[J]. GEOLOGICAL JOURNAL,2020,55(1):994-1002.
APA	Liu, He,Sun, Wei-dong,&Deng, Jianghong.(2020).Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics.GEOLOGICAL JOURNAL,55(1),994-1002.
MLA	Liu, He,et al."Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics".GEOLOGICAL JOURNAL 55.1(2020):994-1002.