The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes
The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes
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温奇科姆陨石的熔壳：进入大气层过程的保存记录
DOI：
10.1111/maps.13937
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发表时间：
2023
影响因子：
2.2
通讯作者：
Genge M
中科院分区：
文献类型：
--
作者：
Genge M
聚变结壳在陨石进入大气层加热时形成，并保存着大气减速期间发生的条件的记录。Winchcombe陨石的熔融地壳与其他石质陨石非常相似，特别是CM2球粒陨石，因为它主要由橄榄石斑晶组成，与磁铁矿共生，具有高度的气泡性。温奇科姆的脱水裂缝异乎寻常地多。这一弱层的失效是一种额外的烧蚀机制，在减速过程中产生大量粒子，这与在温奇科姆火球视频中观察到的等离子体脉冲一致。冰解事件可能会提供一种与陨石有关的可观察到的现象，这些陨石特别容易脱水。与其他陨石相反，熔融地壳中的橄榄石斑晶内观察到了振荡环带，这可能是由于崩解事件引起的温度波动所致。在地壳中发现了磁铁矿单分子层，以前也没有报道过，并形成了不连续的地层。这些特征逐渐形成形成于地壳外表面的磁铁矿边缘，表明表面磁铁矿通过熔体的坍塌而被捕获。磁铁矿单层可能是经历了大量脱气的陨石的一个特征。观察到具有树枝状结构的硅酸盐疣，建议是淋浴时从另一块石头上融化的水滴。因此，它们代表了烧蚀物质在阵雨间转移的第一个证据，并与温奇科姆陨石中的其他证据一致，表明尽管进入速度很低，但气体损失和烧蚀异常强烈。
Fusion crusts form during the atmospheric entry heating of meteorites and preserve a record of the conditions that occurred during deceleration in the atmosphere. The fusion crust of the Winchcombe meteorite closely resembles that of other stony meteorites, and in particular CM2 chondrites, since it is dominated by olivine phenocrysts set in a glassy mesostasis with magnetite, and is highly vesicular. Dehydration cracks are unusually abundant in Winchcombe. Failure of this weak layer is an additional ablation mechanism to produce large numbers of particles during deceleration, consistent with the observation of pulses of plasma in videos of the Winchcombe fireball. Calving events might provide an observable phenomenon related to meteorites that are particularly susceptible to dehydration. Oscillatory zoning is observed within olivine phenocrysts in the fusion crust, in contrast to other meteorites, perhaps owing to temperature fluctuations resulting from calving events. Magnetite monolayers are found in the crust, and have also not been previously reported, and form discontinuous strata. These features grade into magnetite rims formed on the external surface of the crust and suggest the trapping of surface magnetite by collapse of melt. Magnetite monolayers may be a feature of meteorites that undergo significant degassing. Silicate warts with dendritic textures were observed and are suggested to be droplets ablated from another stone in the shower. They, therefore, represent the first evidence for intershower transfer of ablation materials and are consistent with the other evidence in the Winchcombe meteorite for unusually intense gas loss and ablation, despite its low entry velocity.
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