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Raman identification of olivine grains in fine grained mineral assemblages fired into aerogel

机译:在精粒矿物组合中橄榄石粒子的拉曼鉴定到气凝胶中

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NASA's Stardust mission returned from the comet 81P/Wild2 in 2006 and has yielded a plethora of research looking into the composition and attributes of the comet. The mission itself collected thousands of cometary dust particles as it flew through the coma of the comet at a relative speed of 6.1 km s"1. This work focuses on one of the most abundant minerals in the solar system -olivine. Previous work has shown capture affects on this mineral in similar impacts to that experienced during the Stardust mission. However, the past work looked into effects on isolated mineral grains which would be a rare occurrence in the Solar System. A more accurate representation of this would be to investigate the capture effects on olivine as a constituent of an assemblage of minerals. Accordingly, here we used samples from the NWA 10256 CR2 carbonaceous chondrite meteorite. This natural sample contains fine grains of olivine, and brings additional issues when analysing the olivine due to limited homogeneity. Shifts in the Raman spectra for olivine, enstatite and hematite were observed after capture due to shock effects. However, this work suggests that olivine may well experience a different shock effect during capture when part of a mineral assemblage as distinct from that experienced by single grains.
机译:美国宇航局在2006年从Comet 81P / Wild2返回的Stardust任务,并产生了一种研究彗星的组成和属性的研究。特派团本身以6.1 km s“1的相对速度通过彗星的彗星来收集成千上万的灰尘颗粒。这项工作侧重于太阳系中最丰富的矿物质之一 - olivine。以前的工作表明了捕获对这种矿物质的影响与在星级使命期间相似的影响。然而,过去的工作看着孤立的矿物谷物的影响,这将是太阳系中的罕见发生。这是一个更准确的表示是调查捕获对橄榄石的作用作为矿物质组合的组成部分。因此,我们在NWA 10256CR2碳质陨石中使用样品。该天然样品含有较好的橄榄石,并在分析由于均匀性有限而分析橄榄石时产生额外的问题。由于冲击效应,在捕获后观察到橄榄石的拉曼光谱的变化,展望才能观察到。然而,这项工作表明Olivine M当矿物组合的一部分与单粒经历不同的矿物组合时,拍摄时,拍摄时拍摄良好的冲击效果。

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