气候变化领域集成服务门户(CCPortal): Geochemical data indicate highly similar sediment compositions for the Grasberg and Burns formations on Meridiani Planum, Mars

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DOI	10.1016/j.epsl.2020.116729
	Geochemical data indicate highly similar sediment compositions for the Grasberg and Burns formations on Meridiani Planum, Mars
	McCollom T.M.; Hynek B.
发表日期	2021
ISSN	0012821X
卷号	557
英文摘要	The hematite-bearing, sulfate-rich sandstones of the Burns formation at Meridiani Planum are underlain by a thin stratigraphic unit referred to as the Grasberg formation. The sulfate-bearing Grasberg rocks are fine-grained and lack bedding structures, and were previously interpreted to be a distinct lithologic unit based on morphological and chemical differences from the overlying Burns formation. However, reanalysis of the data indicates that, except for variable amounts of Mg, Ni, SO3 and Mn, the chemical compositions of the Grasberg and Burns rocks are very similar. The relatively low levels of Mg, Ni, and SO3 in the Grasberg rocks indicates that they have experienced diagenetic loss of Mg sulfates similar to that observed in a subset of eleven Burns formation rocks depleted in the same elements, including two Burns rocks immediately above the Grasberg contact. The Grasberg formation and Burns rocks near the contact have also evidently lost Mn during diagenesis. When compensated for diagenetic losses, rocks from the Grasberg and Burns formations are found to have nearly identical chemical compositions, albeit Grasberg rocks contained a few wt.% less SO3. These observations suggest that the sediment sources for the Grasberg and Burns formations are genetically related, and that both formations experienced some of the same diagenetic processes after deposition. Furthermore, the apparent loss of Mg, Ni, SO3, and Mn from the Grasberg formation and immediately overlying Burns rocks is mirrored by enrichments of these same elements in fractures within the underlying Shoemaker formation, suggesting downward movement of fluids during some diagenetic events. © 2020 The Author(s)
关键词	Burns formation Grasberg formation Mars geochemistry Meridiani Planum Opportunity rover sulfate deposits
英文关键词	Hematite; Manganese; Manganese compounds; Nickel compounds; Rocks; Stratigraphy; Sulfur compounds; Chemical compositions; Diagenetic events; Diagenetic process; Geochemical data; Meridiani Planum; Sediment composition; Sediment sources; Stratigraphic units; Magnesium compounds; chemical composition; diagenesis; Mars; sandstone; sediment chemistry; spacecraft; sulfate group
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203218
作者单位	Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309, United States; Department of Geological Sciences, University of Colorado, Boulder, CO 80309, United States
推荐引用方式 GB/T 7714	McCollom T.M.,Hynek B.. Geochemical data indicate highly similar sediment compositions for the Grasberg and Burns formations on Meridiani Planum, Mars[J],2021,557.
APA	McCollom T.M.,&Hynek B..(2021).Geochemical data indicate highly similar sediment compositions for the Grasberg and Burns formations on Meridiani Planum, Mars.Earth and Planetary Science Letters,557.
MLA	McCollom T.M.,et al."Geochemical data indicate highly similar sediment compositions for the Grasberg and Burns formations on Meridiani Planum, Mars".Earth and Planetary Science Letters 557(2021).