LINK<\/strong><\/a><\/p>\nHighlights<\/p>\n
\u2022 We report on CO2 gas adsorption experiments on carbonaceous chondrite meteorites.
\n\u2022 Experiments were run at cryogenic temperatures.
\n\u2022 CI Chondrite Ivuna adsorbed significantly more CO2 than the other non-CI meteorites.
\n\u2022 CO2 abundance does not vary with ‘water,’ organic, nor carbonate abundances.
\n\u2022 Possible affinity of CO2 for complex clays and total FeO.Spectral Nature of CO2 Adsorption onto Meteorites.<\/p>\n
“Previous studies have identified carbon dioxide (CO2) on the surfaces of Jovian and Galilean satellites in regions of non-ice material that are too warm for CO2 ice to exist. CO2 ice would quickly sublimate if not retained by a less-volatile material. To ascertain what non-ice species may be responsible for stabilizing this CO2, we performed CO2 gas adsorption experiments on thirteen powdered CM, CI, and CV carbonaceous chondrite meteorites. Reflectance spectra of the \u03bd3 feature associated with adsorbed CO2 near 4.27 \u03bcm were recorded. Results show that many meteorites adsorbed some amount of CO2, as evidenced by an absorption feature that was stable over several hours at ultra-high vacuum (UHV) and high vacuum, (1.0\u00d710\u22128 and 1.0\u00d710\u22127 Torr, respectively). Ivuna, the only CI chondrite studied, adsorbed significantly more CO2 than the others. We found that CO2 abundance did not vary with \u2018water\u2019 abundance, organics, or carbonates as inferred from the area of the 3-\u03bcm band, the 3.2-3.4 \u03bcm C-H feature, and the \u223c3.8-\u03bcm band respectively, but did correlate with hydrous\/anhydrous phyllosilicate ratios. Furthermore, we did not observe CO2 ice because the position of the CO2 feature was generally shifted 3-10 nm from that of the 4.27 \u03bcm absorption characteristic of ice. The strongest compositional relationship observed was a possible affinity of CO2 for total FeO abundance and complex clay minerals, which make up the bulk of the CI chondrite matrix. This finding implies that the most primitive refractory materials in the Solar System may also act as reservoirs of CO2, and possibly other volatiles, delivering them to parts of the Solar System where their ices would not be stable.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Genesis Berlanga, Charles A. Hibbitts, Driss Takir, M. Darby Dyar, Elizabeth Sklute Icarus In Press, Accepted Manuscript, Available online 5 July 2016 LINK Highlights \u2022 We report on CO2 gas adsorption experiments on carbonaceous chondrite…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,10,18,14],"tags":[2090,3021,1059,3023,197,3022],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9354"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9354"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9354\/revisions"}],"predecessor-version":[{"id":9355,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9354\/revisions\/9355"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}