Progressive aqueous alteration and iron oxidation record in the matrix of Mukundpura CM2 chondrite, a new fall
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DOI: 10.1016/j.asr.2021.06.009
Abstract: Abstract The matrices of CM chondrites are fine-grained and have undergone aqueous alteration. Based on mineral chemical composition of matrix phyllosilicate of Mukundpura CM2, the evidence of progressive aqueous alteration is understood and also reflected… read more here.
Keywords: mukundpura cm2; iron oxidation; progressive aqueous; matrix ... See more keywords
53Mn–53Cr radiometric dating of secondary carbonates in CR chondrites: Timescales for parent body aqueous alteration
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DOI: 10.1016/j.gca.2016.08.033
Abstract: Abstract We present 53Mn–53Cr ages of secondary carbonates in Renazzo-like (CR) chondrites, determined by secondary ion mass spectrometry. The timing of aqueous alteration in CR chondrites has been unconstrained in the literature. We measured 53Mn–53Cr… read more here.
Keywords: 53mn 53cr; renazzo; aqueous alteration; gro 95577 ... See more keywords
Petrographic and C & O isotopic characteristics of the earliest stages of aqueous alteration of CM chondrites
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DOI: 10.1016/j.gca.2017.06.049
Abstract: Abstract CM chondrites form the largest group of hydrated meteorites and span a wide range of alteration states, with the Paris meteorite being the least altered CM described to date. Ca-Carbonates are powerful proxies for… read more here.
Keywords: earliest stages; type carbonates; aqueous alteration; alteration ... See more keywords
Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites
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DOI: 10.1016/j.gca.2018.06.021
Abstract: Abstract The recent fall of the relatively unaltered CM chondrite Maribo provides a unique opportunity to study the early stages of aqueous alteration on the CM chondrite parent body. We show using transmission electron microscopy… read more here.
Keywords: isotope record; aqueous alteration; mineralogical changes; altered chondrites ... See more keywords
In-situ water-immersion experiments on amorphous silicates in the MgO–SiO2 system: implications for the onset of aqueous alteration in primitive meteorites
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DOI: 10.1016/j.gca.2020.10.023
Abstract: Abstract Amorphous silicates, abundant in primitive carbonaceous chondrites, are among the most primitive materials from the early Solar System. They show evidence of some aqueous alteration in the meteorite parent bodies, but it is not… read more here.
Keywords: system; water; aqueous alteration; amorphous silicates ... See more keywords
Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites
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DOI: 10.1126/science.abn7850
Abstract: Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measured the mineralogy and bulk chemical and isotopic compositions of… read more here.
Keywords: ryugu samples; carbonaceous meteorites; aqueous alteration; water ... See more keywords
Aqueous alteration processes in Jezero crater, Mars−implications for organic geochemistry
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DOI: 10.1126/science.abo5204
Abstract: The Perseverance rover landed in Jezero crater, Mars in February 2021. We used the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument to perform deep ultraviolet Raman and fluorescence spectroscopy… read more here.
Keywords: jezero crater; aqueous alteration; alteration processes; geochemistry ... See more keywords