LINK<\/strong><\/a><\/p>\n\n\n\n“Highlights<\/p>\n\n\n\n
\u2022 The martian mantle reservoir is H2O-, S-, and Cl-poorer than the Earth’s interior.
\n\u2022 Martian surface Cl was preserved in melt inclusions via water-rock interaction.
\n\u2022 The martian surface water reservoir might be homogeneous in \u03b4D values.
\n\u2022 S-rich hotspots and dendritic H2O-rich bands were detected from melt inclusions.”<\/p>\n\n\n\n
“Martian meteorites of various petrogeneses retain a record of volatiles on Mars: from the hydrosphere, crustal water to the mantle. Sputtering of the martian atmosphere by solar wind after the loss of Mars’ magnetic field enriched it in deuterium, which exchanged with martian crustal water. Recent studies show that the hydrogen isotopic composition of the martian crustal water reservoir varies from 3000 to 7000\u2030 but requires better constraints. Melt inclusion glasses, maskelynite and fusion crust from the depleted olivine-phyric shergotite NWA 6162 were analyzed using NanoSIMS, providing a unique insight into the hydrogen isotopic and volatile elemental content of both the martian crustal water reservoir and the mantle source.<\/p>\n\n\n\n
The H2O, S, and Cl contents of the melt inclusion glasses are \u223c0-3137, 14-239, and 16-967 ppm, respectively. \u03b4D values vary from \u2212560 to 6137\u2030. The water content positively correlates with the \u03b4D values in both the melt inclusion glasses and maskelynite in a two end-member mixing trend. One end-member is the magmatic water with a \u03b4D value of \u223c0\u2030, and the other end member is the martian crustal water with \u03b4D ranging from 5000 to 6000\u2030. NWA 6162, a depleted olivine-phyric shergottite, originated from a different mantle source to the enriched lherzolitic shergottites. However, both types of shergottites exchanged with martian crustal water with the same \u03b4D values, indicating a homogeneous martian crustal water hydrogen isotopic composition (5000-6000\u2030). Most melt inclusion glasses from NWA 6162 have low water content (0-234 ppm) except for two enriched locations as micron-sized bands and dendrites. The low water content in most melt inclusion glasses, the dendritic shaped water enriched areas in melt inclusions, and the martian crustal water diffusion profile recorded in maskelynite collectively suggest short-lived water-rock interactions in the NWA 6162 parent rock that was probably induced by impact. Furthermore, a great contribution (up to 98%) of surface Cl accompanying D-enriched water was recorded in the melt inclusions supported by the positive correlation between Cl and H2O. The presence of sulfide and S-rich hot spots and low \u03b4D end-member of the magmatic water indicate that the degassing during post-entrapment crystallization and ascent of the melt inclusion is negligible. H2O, S, and Cl contents of the martian mantle reservoir are estimated to be 0.1-3, 0.5-15, and 0.5-4 ppm respectively, after the correction of fractional crystallization of the melt inclusions and contribution from the martian surface reservoir. The martian mantle reservoir estimated from NWA 6162 was water-, S-, and Cl-poorer than the Earth’s interior.”<\/p>\n","protected":false},"excerpt":{"rendered":"
Sen Hu, Yangting Lin, Jianchao Zhang, Jialong Hao, Akira Yamaguchi, Ting Zhang, Wei Yang, Hitesh Changela Earth and Planetary Science Letters In Press, Corrected Proof, Available online 11 November 2019 LINK “Highlights \u2022 The martian…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[122,42,43],"tags":[1006,2384,1829],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20694"}],"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=20694"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20694\/revisions"}],"predecessor-version":[{"id":20695,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20694\/revisions\/20695"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}