DOI: 10.1016/j.earscirev.2020.103253
论文题名: Melting of a hydrous peridotite mantle source under the Emeishan large igneous province
作者: Xu R. ; Liu Y. ; Lambart S.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 207 语种: 英语
中文关键词: Mantle plume
; Melt inclusion
; Olivine composition
; Peridotite
; Pyroxenite
英文关键词: geodynamics
; large igneous province
; lithology
; mantle source
; partial melting
; peridotite
; petrogenesis
; petrology
; China
; Emeishan
; Sichuan
英文摘要: Large igneous provinces on Earth result from anomalously enormous volcanic eruptions at high melt production rates. These eruptions are often linked to catastrophic events such as mass extinctions, global climate changes, or continental break-up. Decoding their petrogenesis is therefore of great importance for our comprehensive understanding of the evolution and geodynamics of our planet. The ~260 Ma Emeishan large igneous province is an important geological feature of SW China with world-class ore deposits and is also suggested to be linked with the Capitanian mass extinction. However, fundamental aspects of the genesis of Emeishan province's most primitive lavas (picrites), such as the source lithology (pyroxenite or peridotite), the origin of compositional variations of olivines and the melting temperature and pressure conditions, remain poorly constrained. Here, we compile information on melt inclusion and host olivine, and whole-rock compositions from the ELIP picrites and show that these data are consistent with decompression melting of a relatively homogeneous peridotitic mantle plume, with a potential temperature higher than 1560 °C. The compositional variability of the olivines and picrites can be explained by varying the equilibrium depth of primary magma segregation and does not require the contribution of a pyroxenite component as previously suggested. Our results favor a scenario for the origin of the Emeishan large igneous province in which the decompression melting during upwelling of a hot hydrous and oxidized mantle plume is accompanied by catastrophic lithospheric thinning. In combination with the now extensive multi-element geochemical data, our findings provide a starting point for re-evaluation of the petrogenesis models for large igneous provinces. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166305
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Xu R.,Liu Y.,Lambart S.. Melting of a hydrous peridotite mantle source under the Emeishan large igneous province[J]. Earth Science Reviews,2020-01-01,207