{"id":28132,"date":"2021-06-22T17:19:37","date_gmt":"2021-06-22T15:19:37","guid":{"rendered":"https:\/\/karmaka.de\/?p=28132"},"modified":"2021-06-22T17:48:51","modified_gmt":"2021-06-22T15:48:51","slug":"a-spectral-investigation-of-aqueously-and-thermally-altered-cm-cm-an-and-cy-chondrites-under-simulated-asteroid-conditions-for-comparison-with-osiris-rex-and-hayabusa2-observations","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=28132","title":{"rendered":"A spectral investigation of aqueously and thermally altered CM, CM-an and CY chondrites under simulated asteroid conditions for comparison with OSIRIS-REx and Hayabusa2 observations<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>H. C Bates, K. L. Donaldson Hanna, A. J. King, N. E. Bowles, S. S. Russell<\/p>\n\n\n\n<p>JGR Planets<br>First Published: 17 June 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2021JE006827\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/epdf\/10.1029\/2021JE006827\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p><strong>Key Points<\/strong><\/p>\n\n\n\n<ol><li>Parameters associated with different degrees of aqueous and thermal alteration can be identified in the near- and mid-infrared spectra of meteorites.<\/li><li>Combining observations across multiple wavelength ranges provides the most robust mineralogical determinations.<\/li><li>Spectral parameters associated with mineralogy and processing can help interpret results from OSIRIS-REx and Hayabusa2 observations.<\/li><\/ol>\n\n\n\n<p class=\"justify-text\">&#8220;Volatile-rich asteroids are crucial to understanding the transport of water and organics to the terrestrial planet forming region in the early Solar System. Observations of two such asteroids by Hayabusa2 and OSIRIS-REx suggest a relationship between these bodies and CI, CM and CY chondrites. To confirm this, meteorite spectra need to be collected under appropriate conditions for comparison with asteroid observations. We report mid-infrared (MIR) emissivity spectra (5.5 \u2013 50 \u00b5m) obtained under ambient and simulated asteroid environment conditions and near-infrared (NIR) reflectance spectra (2 \u2012 5 \u00b5m) of CM and CY chondrite fine-particulate (&lt;35 \u00b5m) powders for which bulk mineralogy was determined using X-ray diffraction. Reflectance spectra show a 3 \u00b5m feature associated with -OH\/H2O that shifts from shorter (\u223c2.72 \u00b5m) to longer (\u223c2.90 \u00b5m) wavelengths and develops a rounder shape and reduced band area with increasing thermal metamorphism. In the MIR, the transparency feature (TF) and features in the Si-O bending region (&gt;15 \u00b5m) can be used to infer the relative degree of aqueous alteration, and to resolve the effects of aqueous and thermal alteration, when combined with NIR spectral parameters. The MIR spectra of metamorphosed CY chondrites are distinct from CM chondrite spectra, including a plateau around the Christiansen feature (\u223c8.00 \u2013 12.50 \u00b5m) and features at longer wavelengths in the Si-O bending region (for example, \u223c25.50 \u00b5m compared to \u223c24.30 \u00b5m in the CM spectra). We additionally report potential implications of the spectra and parameters determined in this study for the results from Hayabusa2 and OSIRIS-REx.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>H. C Bates, K. L. Donaldson Hanna, A. J. King, N. E. Bowles, S. S. Russell JGR PlanetsFirst Published: 17 June 2021 LINK (OPEN ACCESS)PDF (OPEN ACCESS) Key Points Parameters associated with different degrees of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,77,5445,9,4909,10,18,5044,2243,552,130,181,1184,62,335],"tags":[5719,3872,3979,5989,2459,553,4958,3273,1809,105,4823,512,2244,815,1686,3257,1886,5321,1576,4684,270,1581,913,2460,1488],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28132"}],"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=28132"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28132\/revisions"}],"predecessor-version":[{"id":28135,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/28132\/revisions\/28135"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}