{"id":36004,"date":"2024-04-18T19:04:33","date_gmt":"2024-04-18T17:04:33","guid":{"rendered":"https:\/\/karmaka.de\/?p=36004"},"modified":"2024-04-18T19:04:37","modified_gmt":"2024-04-18T17:04:37","slug":"an-experimental-simulation-of-oxygen-isotope-exchange-reaction-between-amorphous-silicate-dust-and-carbon-monoxide-gas-in-the-early-solar-system","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=36004","title":{"rendered":"An experimental simulation of oxygen isotope exchange reaction between amorphous silicate dust and carbon monoxide gas in the early Solar System<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Daiki Yamamoto, Noriyuki Kawasaki, Shogo Tachibana, Lily Ishizaki, Ryosuke Sakurai, Hisayoshi Yurimoto<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>In Press, Journal Pre-proof, Available online 18 April 2024<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703724001832\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The reaction mechanism and kinetics of oxygen isotope exchange between tens of nanometer-sized amorphous silicate grains with forsterite composition (amorphous forsterite) and low-pressure carbon monoxide (CO) gas (PCO) of 0.05\u20131\u202fPa at 643\u2013883\u202fK were examined to investigate oxygen isotopic evolution in the protosolar disk that led to the mass-independent oxygen isotopic variation of planetary materials. Both CO gas supply- and diffusion-controlled isotope exchange reactions were observed. At 753\u2013883K and PCO of 0.05\u20131\u202fPa, the supply of CO gas controls the isotope exchange reaction, and its rate is 2\u20133 orders of magnitude smaller than that of the H2O supply-controlled isotope exchange reaction. The diffusion-controlled isotope exchange occurred at 643\u2013703\u202fK and PCO of 0.3\u202fPa, and the reaction rate of D (m2\/s) = (3.1\u202f\u00b1\u202f2.3)\u202f\u00d7\u202f10\u221223 exp[\u221241.7\u202f\u00b1\u202f9.6 (kJ mol\u22121) R\u22121 (1\/T\u202f\u2212\u202f1\/1200)] was obtained.<\/p>\n\n\n\n<p class=\"justify-text\">We found that the oxygen isotope exchange rates of amorphous forsterite with CO and H2O gases are larger than those of gaseous isotope exchange between CO and H2O gases at a wide range of temperatures, wherein amorphous forsterite crystallization does not precede the isotope exchange reaction of amorphous forsterite with these gases. The most sluggish isotope exchange rate between H2O and CO in the gas phase suggests that amorphous forsterite would play a role in accelerating gaseous isotopic equilibrium through the isotope exchange of amorphous forsterite with both CO and H2O. We found that the oxygen isotopic equilibrium between 0.1\u202f\u03bcm-sized amorphous forsterite, CO, and H2O would be accomplished through the isotope exchange of amorphous forsterite at temperatures as low as \u223c600\u2013700\u202fK in the dynamically accreting protosolar disk, which is significantly lower than expected for the case of gaseous isotope exchange (&gt;\u223c800\u202fK).&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Daiki Yamamoto, Noriyuki Kawasaki, Shogo Tachibana, Lily Ishizaki, Ryosuke Sakurai, Hisayoshi Yurimoto Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 18 April 2024 LINK (OPEN ACCESS) &#8220;The reaction mechanism and kinetics of oxygen isotope&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72,65,71],"tags":[1216,3701,604,1845,397],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36004"}],"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=36004"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36004\/revisions"}],"predecessor-version":[{"id":36005,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/36004\/revisions\/36005"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}