{"id":20588,"date":"2019-10-23T12:43:55","date_gmt":"2019-10-23T10:43:55","guid":{"rendered":"http:\/\/karmaka.de\/?p=20588"},"modified":"2019-10-31T12:26:13","modified_gmt":"2019-10-31T10:26:13","slug":"a-unified-model-for-hydrogen-in-the-earth-and-moon-no-one-expects-the-theia-contribution","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20588","title":{"rendered":"A Unified Model for Hydrogen in the Earth and Moon: No one expects the Theia ContributionOPEN ACCESS<\/span> "},"content":{"rendered":"\n

Steven J. Desch, Katharine L. Robinson<\/p>\n\n\n\n

Geochemistry
In Press, Corrected Proof , Available online 22 October 2019<\/p>\n\n\n\n

LINK (OPEN ACCESS)<\/strong><\/a><\/p>\nPDF (OPEN ACCESS)<\/strong><\/a>\n\n\n\n

“The Moon is thought to have formed after a planetary embryo, known as Theia, collided with the proto-Earth 4.5 billion years ago. This so-called Giant Impact was the last major event during Earth\u2019s accretion, and its effects on the composition of the Earth and the newly forming Moon would be measureable today. Recent work on lunar samples has revealed that the Moon\u2019s water was not lost as a result of this giant impact. Instead, the Moon appears to contain multiple hydrogen reservoirs with diverse deuterium-to-hydrogen (D\/H) ratios. For the first time, we incorporate hydrogen isotopic measurements of lunar samples to help constrain the composition of Theia. We show that the Moon incorporated very low-D\/H (\u03b4D \u2248 -750\u2030) materials that only could have derived from solar nebula H2 ingassed into the magma ocean of a large (\u223c0.4 ME) planetary embryo that was largely devoid of chondritic water. We infer Theia was a very large body comparable in size to the proto-Earth, and was composed almost entirely of enstatite chondrite-like material. These conclusions limit the type of impact to a \u201cmerger\u201d model of similarly-sized bodies, or possibly a \u201chit-and-run\u201d model, and they rule out models that mix isotopes too effectively.”<\/p>\n","protected":false},"excerpt":{"rendered":"

Steven J. Desch, Katharine L. Robinson Geochemistry In Press, Corrected Proof , Available online 22 October 2019 LINK (OPEN ACCESS) PDF (OPEN ACCESS) “The Moon is thought to have formed after a planetary embryo, known…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131,112,41,115],"tags":[194,80,1813,1857,2659,1665,114],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20588"}],"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=20588"}],"version-history":[{"count":3,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20588\/revisions"}],"predecessor-version":[{"id":20615,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20588\/revisions\/20615"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}