Zircon trace element evidence for early hydrothermal activity on Mars

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-22 DOI:10.1126/sciadv.adq3694

Jack Gillespie, Aaron J. Cavosie, Denis Fougerouse, Cristiana L. Ciobanu, William D. A. Rickard, David W. Saxey, Gretchen K. Benedix, Phil A. Bland

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引用次数: 0

Abstract

Finding direct evidence for hydrous fluids on early Mars is of interest for understanding the origin of water on rocky planets, surface processes, and conditions essential for habitability, but it is challenging to obtain from martian meteorites. Micro- to nanoscale microscopy of a unique impact-shocked zircon from the regolith breccia meteorite NWA7034 reveals textural and chemical indicators of hydrothermal conditions on Mars during crystallization 4.45 billion years ago. Element distribution maps show sharp alternating zoning defined by marked enrichments of non-formula elements, such as Fe, Al, and Na, and ubiquitous nanoscale magnetite inclusions. The zoning and inclusions are similar to those reported in terrestrial zircon crystallizing in the presence of aqueous fluid and are here interpreted as primary features recording zircon growth from exsolved hydrous fluids at ~4.45 billion years. The unique record of crustal processes preserved in this grain survived early impact bombardment and provides previously unidentified petrological evidence for a wet pre-Noachian martian crust.

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火星早期热液活动的锆石痕量元素证据。

寻找早期火星上含水流体的直接证据，对了解岩质行星上水的起源、表面过程和宜居性的必要条件很有意义，但要从火星陨石中获得这些证据却很困难。对来自残积岩角砾岩陨石 NWA7034 的独特撞击冲击锆石进行微米到纳米级显微镜观察，揭示了火星在 44.5 亿年前结晶期间热液条件的纹理和化学指标。元素分布图显示了由铁、铝和纳等非公式元素的明显富集和无处不在的纳米级磁铁矿包裹体所界定的尖锐交替分带。这种分带和包裹体与所报道的在水性流体中结晶的陆地锆石的分带和包裹体相似，在此被解释为记录锆石在大约 44.5 亿年时从溶出的含水流体中生长的主要特征。该晶粒中保存的独特的地壳过程记录经受住了早期的撞击轰击，为湿润的前纳奇亚火星地壳提供了以前未曾发现的岩石学证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.