{"id":31661,"date":"2022-12-05T08:14:21","date_gmt":"2022-12-05T07:14:21","guid":{"rendered":"https:\/\/karmaka.de\/?p=31661"},"modified":"2022-12-05T08:14:22","modified_gmt":"2022-12-05T07:14:22","slug":"lithium-and-boron-isotopic-compositions-of-olivine-in-chondrules-from-carbonaceous-and-ordinary-chondrite-meteorites-implications-for-the-origin-of-solar-11b-10b-ratio","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=31661","title":{"rendered":"Lithium and boron isotopic compositions of olivine in chondrules from carbonaceous and ordinary chondrite meteorites: implications for the origin of solar 11B\/10B ratio<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Ming-Chang Liu, Marc Chaussidon, Nozomi Matsuda<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>In Press, Journal Pre-proof, Available online 5 December 2022<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0016703722006482\" target=\"_blank\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The origin of solar <sup>11<\/sup>B\/<sup>10<\/sup>B ratio \u223c4 remains an open question. It has been thought that a significant portion of boron in the Solar System was derived from continuous spallation nucleosynthesis during interactions between Galactic Cosmic Rays and C-N-O nuclei in the interstellar medium. However, because GCR-produced boron is characterized by <sup>11<\/sup>B\/<sup>10<\/sup>B \u223c2.5, an endmember with <sup>11<\/sup>B\/<sup>10<\/sup>B > 4 is required to account for the solar <sup>11<\/sup>B\/<sup>10<\/sup>B ratio. Two leading hypotheses for the sources of <sup>11<\/sup>B-rich components include low energy spallation in the Sun\u2019s parental molecular cloud and the neutrino process during the supernova explosions. In this study, lithium and boron elemental and isotopic compositions of seven porphyritic olivine chondrules and one isolated olivine crystal from four meteorites (Allende, Yamato 81020, Asuka 12236, and QUE 97008) were determined in-situ to help constrain which of the two nucleosynthetic mechanisms has most likely supplied the forming Solar System with extra <sup>11<\/sup>B. Apparent isotopic variations in Li\/Si, B\/Si, \u03b4<sup>7<\/sup>Li and \u03b4<sup>11<\/sup>B were found in chondrule olivine crystals, but only three chondrules exhibit statistically resolved \u03b4<sup>11<\/sup>B heterogeneities. Using these three chondrules as a basis for discussion, we evaluated the processes that could potentially cause elemental and isotopic variations of Li and B. We argue that the data can be best understood in the context of condensation of lithium-boron-rich material onto chondrule precursors in (an) initially heterogeneous gaseous reservoir(s), which could be realized if the Solar System derived <sup>11<\/sup>B-rich components from a supernova or supernovae.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ming-Chang Liu, Marc Chaussidon, Nozomi Matsuda Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 5 December 2022 LINK (OPEN ACCESS) &#8220;The origin of solar 11B\/10B ratio \u223c4 remains an open question. It has been&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56,1432],"tags":[6422,108,5420,824,3273,2275,292,1807,3277,2076,424,2323,1655],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31661"}],"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=31661"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31661\/revisions"}],"predecessor-version":[{"id":31662,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/31661\/revisions\/31662"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}