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In situ X-ray diffraction studies of dense hydrous magnesium silicates at mantle conditions

机译:地幔条件下致密含水硅酸镁的原位X射线衍射研究

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摘要

Lizardite was pressurized up to about 28 and 20 GPa and heated at 1310 (±50) and 1100 (±100) ℃; antigorite was pressurized at about 25 and 22 GPa and heated at ~1000 ℃, with a Nd:YAG laser using the double-side laser heating technique. Samples were then examined in situ by energy dispersive synchrotron X-ray diffraction. Our results show that phase E, superhydrous phase B, and phase D are indeed dense silicate phases that are stable at high P-T conditions and quenchable to ambient conditions. Some unidentified peaks observed in our runs indicate the existence of unknown hydrous phases. The lattice parameter and bulk modulus of phase E are in good agreement with previous measurements. The linear moduli of the three axes of superhydrous phase B are k_(ao) = 482 (±36) GPa, k_(bo) = 544 (±62) GPa, and k_(co) = 472 (±66) GPa and the bulk modulus of superhydrous phase B is 156 (±2) GPa. The linear moduli of the three axes of Fe-bearing phase D (phase D_(ant)) are k_(ao) = 422 (±8) GPa and k_(co) = 404 (±4) GPa and the bulk modulus is 134 (±5) GPa, which is ~19% smaller than the Fe-free phase D reported previously. Our results indicate that phase E, superhydrous phase B, and phase D are indeed thermodynamically stable phases at mantle conditions.
机译:将蜥蜴石加压至约28和20 GPa,并在1310(±50)和1100(±100)℃加热;用双面激光加热技术,用Nd:YAG激光器将抗蛇纹石加压到约25和22 GPa,并在〜1000℃加热。然后通过能量色散同步加速器X射线衍射原位检查样品。我们的结果表明,相E,超水相B和相D实际上是致密的硅酸盐相,在高P-T条件下稳定并且可淬灭到环境条件。在我们的运行中观察到一些未鉴定的峰,表明存在未知的水相。 E相的晶格参数和体积模量与先前的测量结果非常吻合。超水相B的三个轴的线性模量分别为k_(ao)= 482(±36)GPa,k_(bo)= 544(±62)GPa,k_(co)= 472(±66)GPa和超水相B的体积模量为156(±2)GPa。含铁相D(相D_(ant))的三个轴的线性模量分别为k_(ao)= 422(±8)GPa和k_(co)= 404(±4)GPa并且体积模量为134 (±5)GPa,比先前报道的无铁相D小〜19%。我们的结果表明,相E,超水相B和相D在地幔条件下确实是热力学稳定的相。

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