globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1844
论文题名:
Strong inheritance of texture between perovskite and post-perovskite in the D′′ layer
作者: Dobson D.P.; Miyajima N.; Nestola F.; Alvaro M.; Casati N.; Liebske C.; Wood I.G.; Walker A.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:7
起始页码: 575
结束页码: 578
语种: 英语
Scopus关键词: core-mantle boundary ; deformation mechanism ; discontinuity ; high pressure system ; lower mantle ; orientation ; perovskite ; seismic anisotropy ; structural geology ; texture
英文摘要: About 200 km above the core-mantle boundary, the D′′ seismic discontinuity marks the depth where magnesium silicate perovskite-the main mantle mineral-is transformed into its high-pressure phase of post-perovskite. Observations of seismic anisotropy within the D′′ region are inferred to arise from textures within post-perovskite that are created by flow in the deep mantle. Specifically, mantle flow is thought to cause post-perovskite to deform, creating a lattice-preferred orientation within the post-perovskite. However, it is difficult to explain all of the observed patterns of seismic anisotropy in the D′′ region from this deformation mechanism alone. Here we use a low-pressure fluoride analogue system to study the transformation from perovskite to post-perovskite in laboratory experiments. We find that post-perovskite can inherit texture from the perovskite phase. If a similar transformation mechanism operates in the Earth, post-perovskite will inherit textures from deformed perovskite and vice versa, as lower-mantle material passes into and out of the D′′ region. We find that this textural inheritance, combined with lattice-preferred orientation in post-perovskite, can explain the observed patterns of anisotropy in the lowermost mantle. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106760
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom; Institute for Geochemistry and Petrology, ETH Zürich, Clausiusstrasse 25, NW, CH-8092 Zürich, Switzerland; Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany; Department of Geosciences, University of Padua, Via Gradenigo 6, I-35131 Padova, Italy; Paul Scherrer Institut, Swiss Light Source, 5232 Villigen PSI, Switzerland; Department of Earth Sciences, Bristol University, Queens Road, Bristol BS8 1RJ, United Kingdom

Recommended Citation:
Dobson D.P.,Miyajima N.,Nestola F.,et al. Strong inheritance of texture between perovskite and post-perovskite in the D′′ layer[J]. Nature Geoscience,2013-01-01,6(7)
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