Iron oxides in comet 81P/Wild 2

Iron oxides in comet 81P/Wild 2
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彗星 81P/Wild 2 中的铁氧化物

DOI:
10.1111/j.1945-5100.2009.01005.x
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发表时间:
2010
影响因子:
2.2
通讯作者:
BRIDGES J
BRIDGES J
中科院分区:
地球科学3区
文献类型:
--
作者:
BRIDGES J

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我们使用同步加速器Fe-XANES、XRS、显微拉曼和SEM-TEM分析了Stardust 41径迹切片和121径迹终端区域切片,以识别氧化铁(磁铁矿-赤铁矿和无定形氧化物)、氧化铁-钛氧化物和富钒铬铁矿(Fe-Cr-V-Ti-Mn氧化物)颗粒,尺寸范围从200 nm到100 μm。  它们与残留的FeNi金属共存。Fe-XANES和显微拉曼分析表明,FeNi金属和磁铁矿(Fe 2 O3 FeO)也含有一些赤铁矿(Fe 2 O3)。FeNi已经被部分氧化(可能是在捕获过程中),但根据我们使用轻气枪和显微拉曼分析的实验工作,我们认为一些磁铁矿-赤铁矿混合物可能起源于Wild 2。来自121号轨道的终端样品也含有硫化物和富镁硅酸盐矿物的痕迹。我们的研究结果显示,Wild 2样品中还原和氧化含铁矿物的不平衡混合物与碳质陨石和行星际尘埃颗粒中的矿物组合类似。这些样本含有一些陆地污染的证据,例如,在121轨道中偶尔出现含锌颗粒和无定形氧化铁,缺乏彗星起源的证据。
We have used synchrotron Fe‐XANES, XRS, microRaman, and SEM‐TEM analyses of Stardust track 41 slice and track 121 terminal area slices to identify Fe oxide (magnetite‐hematite and amorphous oxide), Fe‐Ti oxide, and V‐rich chromite (Fe‐Cr‐V‐Ti‐Mn oxide) grains ranging in size from 200 nm to ∼10 μm. They co‐exist with relict FeNi metal. Both Fe‐XANES and microRaman analyses suggest that the FeNi metal and magnetite (Fe2O3FeO) also contain some hematite (Fe2O3). The FeNi has been partially oxidized (probably during capture), but on the basis of our experimental work with a light‐gas gun and microRaman analyses, we believe that some of the magnetite‐hematite mixtures may have originated on Wild 2. The terminal samples from track 121 also contain traces of sulfide and Mg‐rich silicate minerals. Our results show an unequilibrated mixture of reduced and oxidized Fe‐bearing minerals in the Wild 2 samples in an analogous way to mineral assemblages seen in carbonaceous chondrites and interplanetary dust particles. The samples contain some evidence for terrestrial contamination, for example, occasional Zn‐bearing grains and amorphous Fe oxide in track 121 for which evidence of a cometary origin is lacking.
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