The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall

The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall
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Winchcombe CM 球粒陨石坠落的整体矿物学、元素组成和含水量

DOI:
10.1111/maps.14043
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发表时间:
2023
影响因子:
2.2
通讯作者:
Bates H
Bates H
中科院分区:
地球科学3区
文献类型:
--
作者:
Bates H

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在微观尺度上,温奇康贝CM碳质球粒陨石包含了一些岩性单位与各种程度的水蚀变。然而,当与其他陨石和对无空气天体的远程观测进行比较时,对平均水合状态的理解是有用的。我们报告相关的散装分析多个子样品的温奇康贝陨石,确定平均层状硅酸盐馏分岩石类型为1.2和平均水含量为11.9重量%。我们发现元素组成和铁的分布以及铁的氧化态与其他CM陨石的测量结果一致;然而,温奇康贝的汞浓度很低,为58.1 ± 0.5 ng g−1。我们证明,红外反射光谱的温奇康贝是一致的,其体模态矿物学,并与其他CM陨石具有类似的平均岩石类型。最后,我们还评估了光谱参数是否可以估计H/Si比和水丰度,发现一般光谱参数低估了水丰度的测量值相比。
On the microscale, the Winchcombe CM carbonaceous chondrite contains a number of lithological units with a variety of degrees of aqueous alteration. However, an understanding of the average hydration state is useful when comparing to other meteorites and remote observations of airless bodies. We report correlated bulk analyses on multiple subsamples of the Winchcombe meteorite, determining an average phyllosilicate fraction petrologic type of 1.2 and an average water content of 11.9 wt%. We show the elemental composition and distribution of iron and iron oxidation state are consistent with measurements from other CM chondrites; however, Winchcombe shows a low Hg concentration of 58.1 ± 0.5 ng g−1. We demonstrate that infrared reflectance spectra of Winchcombe are consistent with its bulk modal mineralogy, and comparable to other CM chondrites with similar average petrologic types. Finally, we also evaluate whether spectral parameters can estimate H/Si ratios and water abundances, finding generally spectral parameters underestimate water abundance compared to measured values.
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