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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Ringwoodite lamellae in olivine: Clues to olivine-ringwoodite phase transition mechanisms in shocked meteorites and subducting slabs
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Ringwoodite lamellae in olivine: Clues to olivine-ringwoodite phase transition mechanisms in shocked meteorites and subducting slabs

机译：橄榄石中的林木薄片：在撞击的陨石和俯冲板中从线索到橄榄石-林木的相变机制

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摘要

The first natural occurrence of ringwoodite lamellae was found in the olivine grains inside and in areas adjacent to the shock veins of a chondritic meteorite, and these lamellae show distinct growth mechanism. Inside the veins where pressure and temperature were higher than elsewhere, ringwoodite lamellae formed parallel to the [101] planes of olivine, whereas outside they lie parallel to the (100) plane of olivine. The lamellae replaced the host olivine from a few percent to complete. Formation of these lamellae relates to a diffusion-controlled growth of ringwoodite along shear-induced planar defects in olivine. The planar defects and ringwoodite lamellae parallel to the [101] planes of olivine should have been produced in higher shear stress and temperature region than that parallel to the (100) plane of olivine. This study suggests that the time duration of high pressure and temperature for the growth of ringwoodite lamellae might have lasted at least for several seconds, and that an intracrystalline transformation mechanism of ringwoodite in olivine could favorably operate in the subducting lithospheric slabs in the deep Earth.
机译：菱铁矿片层的第一个自然现象是在软骨陨石陨石脉内和附近的橄榄石颗粒中发现的，这些片层显示出独特的生长机制。在压力和温度高于其他地方的静脉内部，形成了菱铁矿薄片，它们平行于橄榄石的[101]平面，而在外部则与橄榄石的（100）平面平行。薄片将宿主橄榄石从百分之几取代为完整。这些薄片的形成与沿橄榄石中剪切引起的平面缺陷的林木的扩散控制生长有关。平行于橄榄石[101]平面的平面缺陷和菱铁矿片应在比平行于橄榄石（100）平面更高的剪切应力和温度范围内产生。这项研究表明，高压和高温持续的时间使林伍德石薄片生长至少持续了几秒钟，并且橄榄石中林伍德石的晶内转变机制可以有利地作用于深地球俯冲的岩石圈平板中。

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