DOI: 10.1016/j.epsl.2020.116323
论文题名: HIMU geochemical signature originating from the transition zone
作者: Huang S. ; Tschauner O. ; Yang S. ; Humayun M. ; Liu W. ; Gilbert Corder S.N. ; Bechtel H.A. ; Tischler J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 542 语种: 英语
中文关键词: diamond inclusion
; high-pressure minerals
; HIMU
; mantle plumes
; trace elements
; transition zone
英文关键词: Budget control
; Diamond deposits
; Thermal plumes
; Diamond inclusions
; Elemental compositions
; Geochemical features
; Geochemical patterns
; Geochemical signatures
; Incompatible element
; Mantle endmembers
; Ocean island basalts
; Geochemistry
; igneous geochemistry
; igneous intrusion
; isotopic composition
; mantle plume
; transition zone
; volcanism
; Saint Helena
英文摘要: Plume volcanism may sample mantle sources deeper than mid-ocean ridge and arc volcanism. Ocean island basalts (OIBs) are commonly related to plume volcanism, and their diverse isotopic and elemental compositions can be described using a limited number of mantle endmembers. However, the origins and depths of these mantle endmembers are highly debated. Here we show that the HIMU (high μ, μ=238U/204Pb) endmember may reside in the transition zone. Specifically, we report the geochemical signature of a high-pressure multiphase diamond inclusion, entrapped at 420–440 km depth and 1450 ± 50 K, which matches exactly the geochemical patterns of the HIMU-rich OIBs. Since the HIMU component is variably sampled by almost all OIBs, our finding implies that the transition zone causes a major overprint of the geochemical features of mantle plumes. Some mantle plumes, like those feeding Bermuda, St Helena, Tubuai and Mangaia, appear to be dominated by this source. Furthermore, our finding highlights the importance of the transition zone in highly incompatible element budget of the mantle. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165039
Appears in Collections: 气候变化与战略
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作者单位: Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV 89154, United States; National High Magnetic Field Laboratory, Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32310, United States; Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, United States; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
Recommended Citation:
Huang S.,Tschauner O.,Yang S.,et al. HIMU geochemical signature originating from the transition zone[J]. Earth and Planetary Science Letters,2020-01-01,542