LINK<\/strong><\/a><\/p>\n\n\n\n“Highlights<\/p>\n\n\n\n
\u2022 We present the most comprehensive 3-\u03bcm dataset of carbonaceous chondrites ever acquired in environments similar to the ones experienced by asteroids
\n\u2022 We found good agreement between 3-\u03bcm spectral characteristics of carbonaceous chondrites and carbonaceous chondrite classifications.
\n\u2022 The 3-\u03bcm band was found to be diverse, indicative of varying composition, thus suggesting that these carbonaceous chondrites experienced distinct parent body aqueous alteration and metamorphism environments.”<\/p>\n\n\n\n
“We measured 3-\u03bcm reflectance spectra of 21 meteorites that represent all carbonaceous chondrite types available in terrestrial meteorite collections. The measurements were conducted at the Laboratory for Spectroscopy under Planetary Environmental Conditions (LabSPEC) at the Johns Hopkins University Applied Physics Laboratory (JHU APL) under vacuum and thermally-desiccated conditions (asteroid-like conditions). This is the most comprehensive 3-\u03bcm dataset of carbonaceous chondrites ever acquired in environments similar to the ones experienced by asteroids. The 3-\u03bcm reflectance spectra are extremely important for direct comparisons with and appropriate interpretations of reflectance data from ground-based telescopic and spacecraft observations of asteroids. We found good agreement between 3-\u03bcm spectral characteristics of carbonaceous chondrites and carbonaceous chondrite classifications. The 3-\u03bcm band is diverse, indicative of varying composition, thus suggesting that these carbonaceous chondrites experienced distinct parent body aqueous alteration and metamorphism environments. The spectra of CI chondrites, from which significant amount of water adsorbed under ambient conditions was removed, are consistent with Mg-serpentine and clay minerals. The high abundances of organics in CI chondrites is also associated with the mineralogy of these chondrites, oxyhydroxides- and complex clay minerals-rich. CM chondrites, which are cronstedtite-rich, have shallower 3-\u03bcm band than CI chondrites, suggesting they experienced less aqueous alteration. CR chondrites showed moderate aqueous alteration relative to CI and CM chondrites. CV chondrites, except for Efremovka, have a very shallow 3-\u03bcm band, consistent with their lower phyllosilicate proportions. CO chondrites, like most CVs, have a very shallow 3-\u03bcm band that suggest they experienced minor aqueous alteration. The 3-\u03bcm band in CH\/CBb is deep and broad centered ~3.11\u202f\u03bcm, possibly due to the high abundance of FeNi metal and presence of heavily hydrated clasts in these chondrites. The 3-\u03bcm spectra of Essebi (C2-ung) and EET 83226 are more consistent with CM chondrites’ spectra. The 3-\u03bcm spectra of Tagish lake (C2-ung), on the other hand, are consistent with CI chondrites. None of these spectral details could have been resolved without removing the adsorbed water before acquiring spectra.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Driss Takir, Karen R. Stockstill-Cahill, Charles A. Hibbitts, Yusuke Nakauchi Icarus In Press, Accepted Manuscript, Available online 20 May 2019 LINK “Highlights \u2022 We present the most comprehensive 3-\u03bcm dataset of carbonaceous chondrites ever acquired…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,9,10,18,19,12,14],"tags":[1400,1842,3273,4959,687,567,1480,463],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19587"}],"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=19587"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19587\/revisions"}],"predecessor-version":[{"id":19588,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19587\/revisions\/19588"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}