The origin of alteration “orangettes” in Dhofar 019: Implications for the age and aqueous history of the shergottites
The origin of alteration “orangettes” in Dhofar 019: Implications for the age and aqueous history of the shergottites
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佐法尔019中“橙子”蚀变的起源：对shergottites的年龄和水历史的影响
DOI：
10.1111/maps.12987
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发表时间：
2017
影响因子：
2.2
通讯作者：
L. Taylor
中科院分区：
文献类型：
--
作者：
L. Hallis;L. Kemppinen;Martin R Lee;L. Taylor
雪戈特陨石是最大的火星陨石群，也是唯一未发现含有火星水蚀变确切证据的陨石群。鉴于最近有报告称火星表面存在液态水，这项研究旨在详细调查shergottite Dhofar 019中火星层状硅酸盐的可能性。光学显微镜和扫描电子显微镜，然后是透射电子显微镜，证实了存在蚀变橙色，具有由有序性差的层状硅酸镁和方解石组成的层状结构。这些研究确定了maskelynite溶解，随后在溶解坑内镁层状硅酸盐和方解石沉积，作为橘子生产的方法。橙色层中存在塞莱斯廷，方解石中不存在冲击位错特征，以及层状硅酸盐的富镁性质，都表明Dhofar 019上这些特征的陆地起源。
The shergottites are the largest group of Martian meteorites, and the only group that has not been found to contain definitive evidence of Martian aqueous alteration. Given recent reports of current liquid water at the surface of Mars, this study aimed to investigate in detail the possibility of Martian phyllosilicate within shergottite Dhofar 019. Optical and scanning electron microscopy, followed by transmission electron microscopy, confirmed the presence of alteration orangettes, with a layered structure consisting of poorly ordered Mg‐phyllosilicate and calcite. These investigations identified maskelynite dissolution, followed by Mg‐phyllosilicate and calcite deposition within the dissolution pits, as the method of orangette production. The presence of celestine within the orangette layers, the absence of shock dislocation features within calcite, and the Mg‐rich nature of the phyllosilicate, all indicate a terrestrial origin for these features on Dhofar 019.
影响因子：
56.9
作者：
Blake, D. F.;Morris, R. V.;Sarrazin, P.
通讯作者：
Sarrazin, P.