Tracing the earliest stages of hydrothermal alteration on the CM chondrite parent body

Tracing the earliest stages of hydrothermal alteration on the CM chondrite parent body
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追踪 CM 球粒陨石母体热液蚀变的最早阶段

DOI:
10.1111/maps.13734
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发表时间:
2021
影响因子:
2.2
通讯作者:
King A
King A
中科院分区:
地球科学3区
文献类型:
--
作者:
King A

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CM碳质火山岩是我们努力了解挥发分在行星系统形成中的作用的重要资源。我们报告的本体矿物学,水的丰度,和红外(IR)反射光谱的CM Albertes拉巴斯冰原(CRYSTAL)04514,CRYSTAL 04796,CRYSTAL 04565,和CRYSTAL 02333。它们含有丰富的富铁和富镁蛇纹岩(约70-80体积%),基于它们的页硅酸盐组分,我们将AE 04514、AE 04796和AE 04565归类为岩石学亚型1.6,AE 02333归类为1.4。这与估计的水丰度一致,分别为9.9(±1.1)wt%(对于B104796)、10.4(±0.1)wt%(对于B104565)和11.5(±0.5)wt%(对于B102333)。然而,K 04514含有较少的水(8.8 ± 0.3重量%),具有较浅的3 µm带深度,并且缺乏经历了约300-400 °C的后水化温度的托基利尼石。我们的结论是,04514,04796,和04565是最少改变的CM蛋白质,其中保留了原始的功能,从最初的积木的CM母体。最后,我们使用C104514、C104796和C104565的红外光谱特征来识别记录了轻度水合作用的C-复合小行星表面。
The CM carbonaceous chondrites are an important resource in our efforts to understand the role of volatiles in the formation of planetary systems. We report the bulk mineralogy, water abundance, and infrared (IR) reflectance spectra of the CM chondrites LaPaz Icefield (LAP) 04514, LAP 04796, LAP 04565, and LAP 02333. They contain abundant Fe‐ and Mg‐rich serpentines (~70–80 vol%), and based on their phyllosilicate fractions, we classify LAP 04514, LAP 04796, and LAP 04565 as petrologic subtype 1.6 and LAP 02333 as 1.4. This is consistent with estimated water abundances of 9.9 (±1.1) wt% for LAP 04796, 10.4 (±0.1) wt% for LAP 04565, and 11.5 (±0.5) wt% for LAP 02333. However, LAP 04514 contains less water (8.8 ± 0.3 wt%), has a shallower 3 µm band depth, and lacks tochilinite having experienced posthydration temperatures of ~300–400 °C. We conclude that LAP 04514, LAP 04796, and LAP 04565 are among the least altered CM chondrites, which retain primitive features from the initial building blocks of the CM parent body. Finally, we use the IR spectral features of LAP 04514, LAP 04796, and LAP 04565 to identify C‐complex asteroid surfaces that record mild levels of hydration.
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发表时间: 2013-09
影响因子: 2.2
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影响因子: 5
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发表时间: 2013
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发表时间: 2002
影响因子: 2.7
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