{"id":19858,"date":"2019-06-24T06:47:38","date_gmt":"2019-06-24T04:47:38","guid":{"rendered":"http:\/\/karmaka.de\/?p=19858"},"modified":"2019-06-24T06:48:17","modified_gmt":"2019-06-24T04:48:17","slug":"investigating-magmatic-processes-in-the-early-solar-system-using-the-cl-isotopic-systematics-of-eucrites","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=19858","title":{"rendered":"Investigating magmatic processes in the early Solar System using the Cl isotopic systematics of eucrites<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>T.J. Barrett, J.J. Barnes, M. Anand, I.A. Franchi, R.C. Greenwood, B.L.A. Charlier, X.Zhao, F. Moyniere, M.M. Grady<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>\nIn Press, Accepted Manuscript, Available online 22 June 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703719303631\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br>\n<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0016703719303631\/pdfft?md5=a6159a36087bfb79625f557225459f4a&amp;pid=1-s2.0-S0016703719303631-main.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;Generally, terrestrial rocks, martian and chondritic meteorites exhibit a relatively narrow range in bulk and apatite Cl isotope compositions, with \u03b437Cl (per mil deviation from standard mean ocean chloride) values between \u2212 5.6 and + 3.8 \u2030. Lunar rocks, however, have more variable bulk and apatite \u03b437Cl values, ranging from \u223c \u2212 4 to + 40 \u2030. As the Howardite-Eucrite-Diogenite (HED) meteorites represent the largest suite of crustal and sub-crustal rocks available from a differentiated basaltic asteroid (4 Vesta), studying them for their volatiles may provide insights into planetary differentiation processes during the earliest Solar System history.<\/p>\n\n\n\n<p>Here the abundance and isotopic composition of Cl in apatite were determined for seven eucrites representing a broad range of textural and petrological characteristics. Apatite Cl abundances range from \u223c 25 to 4900 ppm and the \u03b437Cl values range from \u2212 3.98 to + 39.2 \u2030. Samples with lower apatite H2O contents were typically also enriched in 37Cl but no systematic correlation between \u03b437Cl and \u03b4D values was observed across samples. Modelled Rayleigh fractionation and a strong positive correlation between bulk \u03b466Zn and apatite \u03b437Cl support the hypothesis that Cl degassed as metal chlorides from eucritic magmas, in a hydrogen-poor environment. In the case of lunar samples, it has been noted that \u03b437Cl values of apatite positively correlate with bulk La\/Yb ratio. Interestingly, most eucrites show a negative correlation with bulk La\/Yb ratio. Recently, isotopically light Cl values have been suggested to record the primary solar nebular signature. If this is the case then 4 Vesta, which accreted rapidly and early in Solar System history, could also record this primary nebular signature corresponding to the lightest Cl values measured here. The significant variation in Cl isotope composition observed within the eucrites are likely related to degassing of metal chlorides.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T.J. Barrett, J.J. Barnes, M. Anand, I.A. Franchi, R.C. Greenwood, B.L.A. Charlier, X.Zhao, F. Moyniere, M.M. Grady Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 22 June 2019 LINK (OPEN ACCESS) PDF (OPEN&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[72,35,33,71],"tags":[658,4975,3701,1823,1872,369,4976],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19858"}],"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=19858"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19858\/revisions"}],"predecessor-version":[{"id":19860,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/19858\/revisions\/19860"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}