{"id":27830,"date":"2021-05-21T18:55:40","date_gmt":"2021-05-21T16:55:40","guid":{"rendered":"https:\/\/karmaka.de\/?p=27830"},"modified":"2021-05-25T09:32:34","modified_gmt":"2021-05-25T07:32:34","slug":"origin-of-hydrogen-isotopic-variations-in-chondritic-water-and-organics","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=27830","title":{"rendered":"Origin of hydrogen isotopic variations in chondritic water and organics<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Laurette Piani, Yves Marrocchi, Lionel G. Vacher, Hisayoshi Yurimoto, Martin Bizzarro<\/p>\n\n\n\n<p>Earth and Planetary Science Letters<br>Volume 567, 1 August 2021<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0012821X21002673\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p>Update (25 May 2021): <a rel=\"noreferrer noopener\" href=\"https:\/\/arxiv.org\/ftp\/arxiv\/papers\/2105\/2105.10814.pdf\" target=\"_blank\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<p>\u2022 The water D\/H ratios are distinct and unique among the different chondrite groups.<br>\u2022 Parent-body processes play secondary roles in controlling the D\/H variations.<br>\u2022 Water and organics record sublimation and isotopic exchanges occurring in the disk.<br>\u2022 Interaction with the parent molecular cloud can have shaped the D\/H variations.<br>\u2022 The D\/H of water and organics might be related to the timing of asteroid accretion.&#8221;<\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Chondrites are rocky fragments of asteroids that formed at different times and heliocentric distances in the early solar system. Most chondrite groups contain water-bearing minerals, attesting that both water-ice and dust were accreted on their parent asteroids. Nonetheless, the hydrogen isotopic composition (D\/H) of water in the different chondrite groups remains poorly constrained, due to the intimate mixture of hydrated minerals and organic compounds, the other main H-bearing phase in chondrites. Building on our recent works using in situ secondary ion mass spectrometry analyses, we determined the H isotopic composition of water in a large set of chondritic samples (CI, CM, CO, CR, and C-ungrouped carbonaceous chondrites) and report that water in each group shows a distinct and unique D\/H signature. Based on a comparison with literature data on bulk chondrites and their water and organics, our data do not support a preponderant role of parent-body processes in controlling the D\/H variations among chondrites. Instead, we propose that the water and organic D\/H signatures were mostly shaped by interactions between the protoplanetary disk and the molecular cloud that episodically fed the disk over several million years. Because the preservation of D-rich interstellar water and\/or organics in chondritic materials is only possible below their respective sublimation temperatures (160 and 350\u2013450 K), the H isotopic signatures of chondritic materials depend on both the timing and location at which their parent body formed.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Laurette Piani, Yves Marrocchi, Lionel G. Vacher, Hisayoshi Yurimoto, Martin Bizzarro Earth and Planetary Science LettersVolume 567, 1 August 2021 LINK Update (25 May 2021): PDF (OPEN ACCESS) &#8220;Highlights \u2022 The water D\/H ratios are&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,10,18,12,576,335,81],"tags":[194,1855],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27830"}],"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=27830"}],"version-history":[{"count":3,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27830\/revisions"}],"predecessor-version":[{"id":27864,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/27830\/revisions\/27864"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27830"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27830"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27830"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}