气候变化领域集成服务门户(CCPortal): Formation of manganese oxides on early Mars due to active halogen cycling

CCPortal

DOI	10.1038/s41561-022-01094-y
	Formation of manganese oxides on early Mars due to active halogen cycling
	Mitra, Kaushik; Moreland, Eleanor L. L.; Ledingham, Greg J. J.; Catalano, Jeffrey G. G.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	133
结束页码	+
卷号	16 期号:2 页码:19
英文摘要	In situ rover investigations on Mars have discovered manganese oxides as fracture-filling materials at Gale and Endeavour craters. Previous studies interpreted these minerals as indicators of atmospheric oxygen on early Mars. By contrast, we propose that the oxidation of manganese by oxygen is highly unlikely because of exceedingly slow reaction kinetics under Mars-like conditions and therefore requires more reactive oxidants. Here we conduct kinetic experiments to determine the reactivity of the oxyhalogen species chlorate and bromate for oxidizing dissolved Mn(ii) in Mars-like fluids. We find that oxyhalogen species, which are widespread on the surface of Mars, induce substantially greater manganese oxidation rates than O-2. From comparisons of the potential oxidation rates of all available oxidants (including reactive oxygen species peroxide and superoxide), we suggest that the oxyhalogen species are the most plausible manganese oxidants on Mars. In addition, our experiments precipitated the manganese oxide mineral nsutite, which is spectrally similar to the dark manganese accumulations reported on Mars. Our results provide a feasible pathway to form manganese oxides under expected geochemical conditions on early Mars and suggest that these phases may record an active halogen cycle rather than substantial atmospheric oxygenation.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000903163700003
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272467
作者单位	Washington University (WUSTL); Washington University (WUSTL); State University of New York (SUNY) System; State University of New York (SUNY) Stony Brook; Rice University
推荐引用方式 GB/T 7714	Mitra, Kaushik,Moreland, Eleanor L. L.,Ledingham, Greg J. J.,et al. Formation of manganese oxides on early Mars due to active halogen cycling[J],2023,16(2):19.
APA	Mitra, Kaushik,Moreland, Eleanor L. L.,Ledingham, Greg J. J.,&Catalano, Jeffrey G. G..(2023).Formation of manganese oxides on early Mars due to active halogen cycling.NATURE GEOSCIENCE,16(2),19.
MLA	Mitra, Kaushik,et al."Formation of manganese oxides on early Mars due to active halogen cycling".NATURE GEOSCIENCE 16.2(2023):19.