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首页> 外文期刊>Contributions to Mineralogy and Petrology >Antigorite equation of state and anomalous softening at 6 GPa: an in situ single-crystal X-ray diffraction study
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Antigorite equation of state and anomalous softening at 6 GPa: an in situ single-crystal X-ray diffraction study

机译：6 GPa下的反gogoite状态方程和异常软化：原位单晶X射线衍射研究

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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 V_0 = 2,914.07(23) A~3, K_(TO) = 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.
机译：在Cerro del Almirez的样品上，首次通过单晶X射线衍射在钻石砧室中测定了蛇纹石的可压缩性，最高可达到8.826（8）GPa。通过三阶Birch-Murnaghan状态方程拟合了高达5.910（6）GPa的十五个压力-体积数据，得出V_0 = 2,914.07（23）A〜3，K_（TO）= 62.9（4）GPa ，其中K'= 6.1（2）。蛇纹石的压缩是非常各向异性的，沿a，b和c的轴向压缩率分别为1.11：1.00：3.22。通过新的状态方程，可以估算出蛇纹石的稳定性上限，该上限相对于现有值处于中间水平，并且与实验更加吻合。在压力超过6 GPa时，蛇纹石显示出明显的体积软化，这可能与非常冷的俯冲板块有关。

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