globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116345
论文题名:
The seismically fastest chemical heterogeneity in the Earth's deep upper mantle—implications from the single-crystal thermoelastic properties of jadeite
作者: Hao M.; Zhang J.S.; Pierotti C.E.; Zhou W.-Y.; Zhang D.; Dera P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 543
语种: 英语
中文关键词: continent-derived sediments/crust ; enriched geochemical reservoirs ; jadeite ; seismic velocity ; single-crystal elasticity
英文关键词: Elasticity ; Equations of state of solids ; Geochemistry ; Sediments ; Seismic waves ; Seismology ; Silicate minerals ; Single crystals ; Thermoelasticity ; Birch-Murnaghan equation of state ; Chemical heterogeneities ; Finite strain equations ; Geochemical heterogeneity ; High-pressure condition ; Single crystal x-ray diffraction ; Temperature conditions ; Thermoelastic properties ; Crystal symmetry ; heterogeneity ; high pressure ; jadeite ; seismic velocity ; subduction ; temperate environment ; thermoelasticity ; upper mantle
英文摘要: Jadeite is a major mineral phase (up to 50 vol%) in the subducted sediments/crust with continental origin, which are one of the major heterogeneities and important enriched geochemical reservoirs (such as EM-1 and EM-2) for incompatible elements in the Earth's interior. Identifying and locating the enriched geochemical heterogeneities requires knowledge of the elastic properties of relevant mineral phases at high pressure-temperature conditions. Unfortunately, the single-crystal elastic properties of jadeite have never been measured at high-pressure conditions, partially due to its low crystal symmetry. In this study, we have experimentally determined the single-crystal elastic moduli of jadeite at high pressures for the first time up to 18 GPa at the ambient temperature condition using Brillouin spectroscopy. Fitting the third-order finite strain equation of state to the velocity-pressure data yields KS0 ′=3.9(1), G0 ′=1.09(4) with ρ0=3.302(5) g/cm3, KS0=138(3) GPa, and G0=84(2) GPa. In addition, we have also conducted synchrotron single-crystal X-ray diffraction experiments up to 25 GPa and 700 K. The fitting of a Holland-Powell type thermal-pressure Birch-Murnaghan equation of state yields KT0 ′=3.8(2) and α0=3.4(5) ×10−5 K−1. Based on the obtained thermoelastic parameters of jadeite, the density and seismic velocities of continent-derived sediments/crust are modeled at the depth range from 200 to 500 km. The seismic velocities of the subducted continental sediments/crust become extremely fast at depths greater than ∼300 km, up to 11.8% and 14.7% faster than the Vp and Vs of the ambient mantle, and 5.6% and 7.3% faster than the Vp and Vs of the subducted oceanic crust. The existence of even a small amount of the subducted continental sediments/crust can result in strong seismic anomalies in the Earth's interior. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165009
Appears in Collections:气候变化与战略

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作者单位: Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States; Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, United States; Albuquerque High School, Albuquerque, NM 87102, United States; Hawaii Institute of Geophysics and Planetology, University of Hawaii at ManoaHI 96822, United States; GeoSoiEnviroCARS, University of Chicago, Argonne National Laboratory, Argonne, IL 60439, United States

Recommended Citation:
Hao M.,Zhang J.S.,Pierotti C.E.,et al. The seismically fastest chemical heterogeneity in the Earth's deep upper mantle—implications from the single-crystal thermoelastic properties of jadeite[J]. Earth and Planetary Science Letters,2020-01-01,543
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