LINK<\/strong><\/a><\/p>\n\n\n\n“Martian meteorites are key for assessing the isotopic characteristics of nitrogen in different martian reservoirs (i.e., mantle, crust, and atmosphere), and, ultimately, for constraining the source(s) of nitrogen trapped during the earliest stages of planetary accretion in the terrestrial planet-forming region. In this study, we analysed, for the first time, the nitrogen content and isotopic composition of glassy melt inclusions of Chassigny and of the mesostasis of five nakhlites (MIL 03346, Nakhla, NWA 6148, NWA 998, and Y 000593) by in situ secondary ion mass spectrometry. The nitrogen content of Chassigny melt inclusions, corrected for olivine overgrowth on the inclusion walls, varies from 4 \u00b1 1 to 860 \u00b1 45 ppm N, and the majority of \u03b415N values range from \u201335 \u00b1 41 to +73 \u00b1 36\u2030. The estimated nitrogen isotopic signature of the primitive melt, prior to degassing of N2 or NH3, is 0 \u00b1 32\u2030. The mesostasis of nakhlites contains 2.7 \u00b1 0.2 to 943 \u00b1 156 ppm N, with \u03b415N values from \u201330 \u00b1 37 to +348 \u00b1 43\u2030. Whereas degassing of N2 or NH3 can explain the lowest nitrogen isotopic ratios measured in the nakhlite mesostasis, the 15N-enriched isotopic composition (\u03b415N > 150\u2030) of four nakhlites (MIL 03346, Nakhla, NWA 6148, and Y 000593) likely results from interaction of the mesostasis melt with the martian atmosphere during ejection. The \u03b415N values (+25 \u00b1 42 and +77 \u00b1 19\u2030) of two melt inclusions in Y 000593 are comparable to those of Chassigny, further confirming that these meteorites likely sample a common volatile reservoir in the martian interior. Overall, the new results indicate that the chassignite-nakhlite reservoir did not inherit nitrogen from the solar nebula but, instead, from chondritic-like materials. These findings further confirm that planetary bodies in the inner solar system accreted (isotopically) chondritic nitrogen during the first few million years of solar system history.”<\/p>\n","protected":false},"excerpt":{"rendered":"
C. Deligny, E. F\u00fcri, E. Deloule, A.H. Peslier, F. Faure, Y. Marrocchi Geochimica et Cosmochimica ActaAvailable online 23 January 2023 LINK “Martian meteorites are key for assessing the isotopic characteristics of nitrogen in different martian…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,122,42,44],"tags":[1831,1858,638,383,1830,654,4972,633,636],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32148"}],"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=32148"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32148\/revisions"}],"predecessor-version":[{"id":32149,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32148\/revisions\/32149"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=32148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=32148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=32148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}