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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Elasticity of pyrope and majorite-pyrope solid solutions to high temperatures
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Elasticity of pyrope and majorite-pyrope solid solutions to high temperatures

机译：焦炉石和镁橄榄石固溶体对高温的弹性

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摘要

Majorite-garnet solid solutions are major mineral phases in the Earth's upper mantle and transition zone. Here we present the first Brillouin scattering measurements of the elasticity of majorite (Mj, Mg_4Si_4O_(12)-pyrope (Py, Mg_3Al_2Si_3O_(12) solid solutions (Mj_(50)Py_(50) and Mj_(80)Py_(20)) and single-crystal elasticity of pure synthetic pyrope at temperatures up to 800 ℃. The temperature derivatives of the adiabatic bulk (K_S) and shear (μ) moduli for all compositions along the Mj-Py join are the same within the experimental uncertainties (-(partial deriv)K_S/(partial deriv)T = 14.0-14.5(20) MPa/K, -(partial deriv)μ/(partial deriv)T=8.3-9.2(10) MPa/K). The temperature dependence of the acoustic velocities for Mj-Py solid solutions is about half that of other major transition zone minerals. This implies that temperature variations in the transition zone, inferred from lateral velocity heterogeneity, can be significantly underestimated if the properties of majoritic garnet are not taken into account.
机译：石榴石石榴石固溶体是地球上地幔和过渡带的主要矿物相。在这里，我们介绍了对镁铁矿（Mj，Mg_4Si_4O_（12）-pyrope（Py，Mg_3Al_2Si_3O_（12）固溶体（Mj_（50）Py_（50）和Mj_（80）Py_（20））弹性的首次布里渊散射测量。纯合成吡咯的最高单晶弹性和最高800℃的单晶弹性。沿着Mj-Py连接的所有组成的绝热体（K_S）和剪切（μ）模量的温度导数在实验不确定性范围内相同（- （偏导数）K_S /（偏导数）T = 14.0-14.5（20）MPa / K，-（偏导数）μ/（偏导数T = 8.3-9.2（10）MPa / K）。 Mj-Py固溶体的声速大约是其他主要过渡带矿物的声速的一半，这意味着如果不考虑主要石榴石的性质，则可以大大低估由横向速度异质性推断出的过渡带温度变化。帐户。

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