气候变化领域集成服务门户(CCPortal): Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars

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DOI	10.1038/s41467-020-20705-z
	Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars
	Baccolo G.; Delmonte B.; Niles P.B.; Cibin G.; Di Stefano E.; Hampai D.; Keller L.; Maggi V.; Marcelli A.; Michalski J.; Snead C.; Frezzotti M.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Many interpretations have been proposed to explain the presence of jarosite within Martian surficial sediments, including the possibility that it precipitated within paleo-ice deposits owing to englacial weathering of dust. However, until now a similar geochemical process was not observed on Earth nor in other planetary settings. We report a multi-analytical indication of jarosite formation within deep ice. Below 1000 m depth, jarosite crystals adhering on residual silica-rich particles have been identified in the Talos Dome ice core (East Antarctica) and interpreted as products of weathering involving aeolian dust and acidic atmospheric aerosols. The progressive increase of ice metamorphism and re-crystallization with depth, favours the relocation and concentration of dust and the formation of acidic brines in isolated environments, allowing chemical reactions and mineral neo-formation to occur. This is the first described englacial diagenetic mechanism occurring in deep Antarctic ice and supports the ice-weathering model for jarosite formation on Mars, highlighting the geologic importance of paleo ice-related processes on this planet. Additional implications concern the preservation of dust-related signals in deep ice cores with respect to paleoclimatic reconstructions and the englacial history of meteorites from Antarctic blue ice fields. © 2021, The Author(s).
语种	英语
scopus关键词	ice; Article; astronomy; chemical reaction; comparative study; controlled study; crystal; crystallization; energy dispersive X ray spectroscopy; eutectic point; Late Quaternary; mineral dust; particle size; physical chemistry; quantitative analysis; scanning electron microscopy; scanning transmission electron microscopy; weathering; X ray absorption spectroscopy
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251534
作者单位	Department of Environmental and Earth Sciences, University of Milano-Bicocca, Milan, 20126, Italy; INFN, section of Milano-Bicocca, Milan, 20126, Italy; NASA Johnson Space Center, Houston, TX 77058, United States; Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, United Kingdom; Department of Physical, Earth and Environmental Sciences, University of Siena, Siena, 53100, Italy; Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, 00044, Italy; Rome International Center for Materials Science - Superstripes, Rome, 00185, Italy; Department of Earth Sciences, University of Hong Kong, Hong Kong; Jacobs, NASA Johnson Space Center, Houston, TX 77058, United States; Department of Science, University Roma Tre, Rome, Italy
推荐引用方式 GB/T 7714	Baccolo G.,Delmonte B.,Niles P.B.,et al. Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars[J],2021,12(1).
APA	Baccolo G..,Delmonte B..,Niles P.B..,Cibin G..,Di Stefano E..,...&Frezzotti M..(2021).Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars.Nature Communications,12(1).
MLA	Baccolo G.,et al."Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars".Nature Communications 12.1(2021).