Chao Wang
Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants
Wang, Chao; Song, Shuguang; Wei, Chunjing; Su, Li; Allen, Mark B.; Niu, Yaoling; Li, Xian-Hua; Dong, Jinlong
Authors
Shuguang Song
Chunjing Wei
Li Su
Professor Mark Allen m.b.allen@durham.ac.uk
Professor
Yaoling Niu
Xian-Hua Li
Jinlong Dong
Abstract
The thermal and chemical state of the early Archaean deep mantle is poorly resolved due to the rare occurrences of early Archaean magnesium-rich volcanic rocks. In particular, it is not clear whether compositional heterogeneity existed in the early Archaean deep mantle and, if it did, how deep mantle heterogeneity formed. Here we present a geochronological and geochemical study on a Palaeoarchaean ultramafic–mafic suite (3.45-Gyr-old) with mantle plume signatures in Longwan, Eastern Hebei, the North China Craton. This suite consists of metamorphosed cumulates and basalts. The meta-basalts are iron rich and show the geochemical characteristics of present-day oceanic island basalt and unusually high mantle potential temperatures (1,675 °C), which suggests a deep mantle source enriched in iron and incompatible elements. The Longwan ultramafic–mafic suite is best interpreted as the remnants of a 3.45-Gyr-old enriched mantle plume. The first emergence of mantle-plume-related rocks on the Earth 3.5–3.45 billion years ago indicates that a global mantle plume event occurred with the onset of large-scale deep mantle convection in the Palaeoarchaean. Various deep mantle sources of these Palaeoarchaean mantle-plume-related rocks imply that significant compositional heterogeneity was present in the Palaeoarchaean deep mantle, most probably introduced by recycled crustal material.
Citation
Wang, C., Song, S., Wei, C., Su, L., Allen, M. B., Niu, Y., …Dong, J. (2019). Palaeoarchaean deep mantle heterogeneity recorded by enriched plume remnants. Nature Geoscience, 12(8), 672-678. https://doi.org/10.1038/s41561-019-0410-y
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 14, 2019 |
Online Publication Date | Jul 22, 2019 |
Publication Date | Jul 22, 2019 |
Deposit Date | Aug 5, 2019 |
Publicly Available Date | Jan 22, 2020 |
Journal | Nature Geoscience |
Print ISSN | 1752-0894 |
Electronic ISSN | 1752-0908 |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 12 |
Issue | 8 |
Pages | 672-678 |
DOI | https://doi.org/10.1038/s41561-019-0410-y |
Public URL | https://durham-repository.worktribe.com/output/1296698 |
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