枯竭shergotites的源火山口

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Fanglu LUO, Zhiyong XIAO, Rui XU, Yiren CHANG, Yizhen MA, Wei CAO, Yunhua WU, Yichen WANG
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引用次数: 0

摘要

枯竭的shergoites记录了关于火星地幔的主要成分和分化的独特信息。它们的岩石学、地球化学、宇宙射线暴露和结晶年龄表明,它们中的大多数是在亚马逊时代的塔尔西斯和埃利西姆火山省的熔岩流中被一次年轻的撞击所挖掘出来的。然而,为单个陨石坑得出一致的模型年龄的困难以及对能够喷射火星陨石的3-7公里陨石坑的不充分评估尚未得到解决。在这里,我们用D >进行了详细的地质调查和陨石坑统计,在冲击熔体沉积物斑块中寻找枯竭的菱长岩的潜在来源陨石坑;3公里,特别是在塔尔西斯和极乐山火山省。通过排除喷出物沉积物中不均匀结构的影响,我们系统更新的模型年龄显示,Ascraeus Mons北侧的Chakpar陨石坑是最合适的候选者。这个陨石坑的当地环境允许在陨石和特定的熔岩流之间建立联系。这里的长寿火山中心可能经历了大约18亿年的喷发和/或局部沉积中断,并且在大约110万年的撞击发生时存在丰富的地下水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Source Crater of Depleted Shergottites

Depleted shergottites record unique information about the primary composition and differentiation of the mantle of Mars. Their petrology, geochemistry, and cosmic ray exposure and crystallization ages suggest that most of them were excavated by a single young impact in the Amazonian-aged lava flows of the Tharsis and Elysium volcanic provinces. However, the difficulties of deriving consistent model ages for individual craters and inadequate evaluation of 3–7 km craters capable of ejecting martian meteorites have not been settled. Here we perform detailed geological investigations and crater statistics in patches of impact melt deposits for potential source craters of depleted shergottites with D > 3 km, especially those in the Tharsis and Elysium volcanic provinces. By excluding the effect of heterogeneous textures across ejecta deposits, which hinder straightforward extraction of superposed production populations, our systematically updated model ages reveal that Chakpar crater at the northern flank of Ascraeus Mons is the best-fit candidate. The local context of this crater permits establishing a link between the meteorites and specific lava flows. The long-lived volcanic center here may experience an eruption and/or local deposition hiatus for about 1.8 billion years, and abundant subsurface water existed when the impact occurred at about 1.1 million years.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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