{"id":20711,"date":"2019-11-19T17:39:09","date_gmt":"2019-11-19T16:39:09","guid":{"rendered":"http:\/\/karmaka.de\/?p=20711"},"modified":"2019-11-19T17:39:12","modified_gmt":"2019-11-19T16:39:12","slug":"organics-preserved-in-anhydrous-interplanetary-dust-particles-pristine-or-not","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20711","title":{"rendered":"Organics preserved in anhydrous interplanetary dust particles: Pristine or not?<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Queenie H. S. Chan, Ian A. Franchi, Xuchao Zhao, Alice Stephant, Ian P. Wright, Conel M. O&#8217;D. Alexander <\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<br>\nFirst Published:  19 November 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13414\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br>\n<a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13414\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The chondritic\u2010porous subset of interplanetary dust particles (CP\u2010IDPs) are thought to have a cometary origin. Since the CP\u2010IDPs are anhydrous and unaltered by aqueous processes that are common to chondritic organic matter (OM), they represent the most pristine material of the solar system. However, the study of IDP OM might be hindered by their further alteration by flash heating during atmospheric entry, and we have limited understanding on how short\u2010term heating influences their organic content. In order to investigate this problem, five CP\u2010IDPs were studied for their OM contents, distributions, and isotopic compositions at the submicro\u2010 to nanoscale levels. The OM contained in the IDPs in this study spans the spectrum from primitive OM to that which has been significantly processed by heat. Similarities in the Raman D bands of the meteoritic and IDP OMs indicate that the overall gain in the sizes of crystalline domains in response to heating is similar. However, the Raman \u0393G values of the OM in all of the five IDPs clearly deviate from those of chondritic OM that had been processed during a prolonged episode of parent body heating. Such disparity suggests that the nonaromatic contents of the OM are different. Short duration heating further increases the H\/C ratio and reduces the \u03b413C and \u03b4D values of the IDP OM. Our findings suggest that IDP OM contains a significant proportion of disordered C with low H content, such as sp2 olefinic C=C, sp3 C\u2013C, and\/or carbonyl contents as bridging material.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Queenie H. S. Chan, Ian A. Franchi, Xuchao Zhao, Alice Stephant, Ian P. Wright, Conel M. O&#8217;D. Alexander Meteoritics &amp; Planetary Science First Published: 19 November 2019 LINK (OPEN ACCESS) PDF (OPEN ACCESS) &#8220;The chondritic\u2010porous&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,18,12,14,23,24,576],"tags":[1051,108,282,1214,743,301,1636,1393,107,1989,5278,264],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20711"}],"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=20711"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20711\/revisions"}],"predecessor-version":[{"id":20712,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20711\/revisions\/20712"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}