Antigorite equation of state and anomalous softening at 6 GPa: an in situ single-crystal X-ray diffraction study

被引：0
作者：
Fabrizio Nestola
Ross J. Angel
Jing Zhao
Carlos J. Garrido
Vicente López Sánchez-Vizcaíno
Giancarlo Capitani
Marcello Mellini
机构：
[1] Università di Padova,Dipartimento di Geoscienze
[2] CNR-IGG,Facultad de Ciencias
[3] Sezione di Padova,Departamento de Geología
[4] Crystallography Laboratory,Dipartimento di Scienze Geologiche e Geotecnologie
[5] Virginia Polytechnic Institute and State University,Dipartimento di Scienze della Terra
[6] Instituto Andaluz de Ciencias de la Tierra (IACT),undefined
[7] CSIC & UGR,undefined
[8] Universidad de Jaén (Unidad Asociada al CSIC-IACT Granada),undefined
[9] Escuela Politécnica Superior,undefined
[10] Università degli Studi di Milano Bicocca,undefined
[11] Università di Siena,undefined
来源：
Contributions to Mineralogy and Petrology | 2010年 / 160卷
关键词：
Antigorite; High pressure; Softening; X-ray diffraction;
D O I：
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中图分类号：
学科分类号：
摘要：
The compressibility of antigorite has been determined up to 8.826(8) GPa, for the first time by single crystal X-ray diffraction in a diamond anvil cell, on a specimen from Cerro del Almirez. Fifteen pressure–volume data, up to 5.910(6) GPa, have been fit by a third-order Birch–Murnaghan equation of state, yielding V0 = 2,914.07(23) Å3, KT0 = 62.9(4) GPa, with K′ = 6.1(2). The compression of antigorite is very anisotropic with axial compressibilities in the ratio 1.11:1.00:3.22 along a, b and c, respectively. The new equation of state leads to an estimation of the upper stability limit of antigorite that is intermediate with respect to existing values, and in better agreement with experiments. At pressures in excess of 6 GPa antigorite displays a significant volume softening that may be relevant for very cold subducting slabs.
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页码：33 / 43
页数：10
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