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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 >Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites
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Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites

机译：L6球粒陨石橄榄石中连贯和随后不连贯的林木生长

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摘要

Pervasive replacement of original olivine grains by ringwoodite adjacent to a shock-melt vein of Yamato 791384L6 chondrite was observed with a FEG-SEM. In these olivines, we observed three distinct olivine-ringwoodite textures arranged in a spatially successive arrangement from the wall of the shock-melt vein into the olivine grains: (1) polycrystalline ringwoodite, (2) oriented several sets of ringwoodite lamellae and (3) oriented single lamellae. TEM images show that the polycrystalline and oriented several sets of lamellae parts consist of polycrystalline ringwoodite, indicating that phase transformation from olivine to ringwoodite is controlled by incoherent growth mechanism. On the other hand, the set of oriented single lamellae consists of thin ringwoodite platelets (<~10nm in thickness) depicting, as observed here for the first time in nature, coherent crystallographic orientation: (100)_(Ol)//{111}Rgt. Previous TEM studies reported that only the incoherent growth mechanism was active during the transformation in the shocked chondrite. However, our TEM studies revealed evidence for formation of the coherent intracrystalline lamella growth mechanism then followed by incoherent growth in the shocked chondrite in nature, thus allowing to constrain a robust time scale of the shock and at the origin of the veins.
机译：用FEG-SEM观察到，邻近大和791384L6球粒陨石的熔融熔体的林铁石广泛地替代了原始橄榄石颗粒。在这些橄榄石中，我们观察到了三种不同的橄榄石-白云母质地，它们在空间上相继排列，从冲击熔体的脉壁到橄榄石颗粒：（1）多晶林伍德石，（2）取向了几套林伍德薄片和（3 ）定向单片。 TEM图像表明，多晶和取向的几片片状部分由多晶菱铁矿组成，表明从橄榄石到菱铁矿的相变受非相干生长机制控制。另一方面，一组定向的单片晶由薄的林木质片晶（厚度<〜10nm）组成，这是自然界中首次观察到的相干晶体学取向：（100）_（Ol）// {111 } gt。先前的TEM研究报道，在冲击球粒陨石的转化过程中，只有非相干生长机制是活跃的。但是，我们的TEM研究揭示了形成相干晶体内片层生长机制的证据，然后自然形成了震惊的球粒状晶体，导致了不相干的生长，从而限制了休克的稳健时间尺度和静脉起源。

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