A three-dimensional microgeodynamic model of melt geometry in the Earth's deep interior
作者： Jesse Wimert , Saswata Hier-Majumder
DOI: 10.1029/2011JB009012
关键词:
摘要: [1] This article presents a three-dimensional microgeodynamic model of grain-melt geometry in partially molten rocks. The isotropic unit cell the rock is characterized by face-centered-cubic symmetry, consisting rhombic dodecahedral grains. variation surface tension between grain-grain and contacts excites coupled viscous flow within grains interstitial melt, leading to steady state geometry. We obtain fractional area intergranular contact, contiguity, from these models as function melt volume fraction, fractions 0.05 0.25. Comparison with previous results indicates that contiguity lower than two-dimensional models. contrast two- values increases at high fractions. apply our ultralow-velocity zones (ULVZs) very low velocity province (VLVP) Earth's core-mantle boundary. observed seismic signature ULVZ VLVP can be explained peridotite 0.08 0.12 0.01 0.05, respectively, matrix elastic properties similar Preliminary Earth Reference Model.
harvard.edu
agu.org参考文章(63)
Jesse Tyler Wimert, A Semianalytical, Three Dimensional Model of Microstructure in Multiparticle, Multiphase Flow ,(2011)
Tapan Mukerji, Jack Dvorkin, Gary Mavko, The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media ,(2011)
J. K. Wicks, J. M. Jackson, W. Sturhahn, Very low sound velocities in iron-rich (Mg,Fe)O: Implications for the core-mantle boundary region Geophysical Research Letters. ,vol. 37, ,(2010) , 10.1029/2010GL043689
S. Hier-Majumder, Development of anisotropic mobility during two-phase flow Geophysical Journal International. ,vol. 186, pp. 59- 68 ,(2011) , 10.1111/J.1365-246X.2011.05024.X
Lars Stixrude, Bijaya Karki, Structure and freezing of MgSiO3 liquid in Earth's lower mantle. Science. ,vol. 310, pp. 297- 299 ,(2005) , 10.1126/SCIENCE.1116952
Ryuichi Nomura, Haruka Ozawa, Shigehiko Tateno, Kei Hirose, John Hernlund, Shunsuke Muto, Hirofumi Ishii, Nozomu Hiraoka, Spin crossover and iron-rich silicate melt in the Earth’s deep mantle Nature. ,vol. 473, pp. 199- 202 ,(2011) , 10.1038/NATURE09940
Yasuko Takei, Deformation‐induced grain boundary wetting and its effects on the acoustic and rheological properties of partially molten rock analogue Journal of Geophysical Research. ,vol. 110, ,(2005) , 10.1029/2005JB003801
Ulrich H. Faul, Melt retention and segregation beneath mid-ocean ridges. Nature. ,vol. 410, pp. 920- 923 ,(2001) , 10.1038/35073556
Alexander R. Hutko, Thorne Lay, Justin Revenaugh, Localized double-array stacking analysis of PcP: D″ and ULVZ structure beneath the Cocos plate, Mexico, central Pacific, and north Pacific Physics of the Earth and Planetary Interiors. ,vol. 173, pp. 60- 74 ,(2009) , 10.1016/J.PEPI.2008.11.003