{"id":35089,"date":"2024-01-28T23:03:57","date_gmt":"2024-01-28T22:03:57","guid":{"rendered":"https:\/\/karmaka.de\/?p=35089"},"modified":"2024-01-28T23:03:58","modified_gmt":"2024-01-28T22:03:58","slug":"clumped-isotope-and-%ce%b417o-measurements-of-carbonates-in-cm-carbonaceous-chondrites-new-insights-into-parent-body-thermal-and-fluid-evolution","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=35089","title":{"rendered":"Clumped isotope and \u039417O measurements of carbonates in CM carbonaceous chondrites: new insights into parent body thermal and fluid evolution<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Matthieu Clog, Paula Lindgren, Sevasti Modestou, Alex McDonald, Andrew Tait, Terry Donnelly, Darren Mark, Martin Lee<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>In Press, Journal Pre-proof, Available online 28 January 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703724000462\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The CM carbonaceous chondrites are key archives for understanding the earliest history of the solar system. Their C-complex asteroid parent body(ies) underwent aqueous alteration, among the products of which are carbonate minerals that can faithfully record the conditions of their formation. In this study we report carbon, triple oxygen and clumped isotope compositions of carbonates in six CM chondrites which span a range in degrees of aqueous alteration (Allan Hills 83100, Cold Bokkeveld, LaPaz Icefield 031166, Lonewolf Nunataks 94101, Murchison, Scott Glacier 06043). \u039417O values range from -1 to -2.6\u2030 (\u00b10.1), and where calcite and dolomite co-exist their \u039417O differ by 0.6 permil, suggesting precipitation from distinct fluids. Calculated crystallization temperatures range from 5 to 51\u2070C for calcite (typically \u00b110\u2070C) and 75 to 101(\u00b115)\u2070C for dolomite. The \u03b418OVSMOW of the aqueous fluids from which they formed ranges from -6.6 to 2.3\u2030, with no relationship to the \u03b413C of carbonates. As the population of carbonates in any one CM chondrite can include multiple generations of grains that formed at different conditions, these values represent the mode of the temperature of carbonate formation for each meteorite. We observe that in the more altered meteorites carbonate \u039417O values are lower and formation temperatures are higher. These correlations are consistent with aqueous alteration of the CM chondrites being a prograde reaction whereby the hotter fluids had undergone greater isotope exchange with the anhydrous matrix. Our data are broadly consistent with the closed system model for water\/rock interaction, but carbonate mineral formation in the latter stages of aqueous alteration may be linked to fluid movement via fractures.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Matthieu Clog, Paula Lindgren, Sevasti Modestou, Alex McDonald, Andrew Tait, Terry Donnelly, Darren Mark, Martin Lee Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 28 January 2024 LINK (OPEN ACCESS) &#8220;The CM carbonaceous chondrites&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,77,2350,9,18,65],"tags":[3965,2935,1842,1974,3991,250,3273,701,105,3646,1054,3645,235,107,1845,5974,840,4205],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/35089"}],"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=35089"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/35089\/revisions"}],"predecessor-version":[{"id":35090,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/35089\/revisions\/35090"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=35089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=35089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=35089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}