{"id":9444,"date":"2016-07-20T00:55:56","date_gmt":"2016-07-19T22:55:56","guid":{"rendered":"http:\/\/karmaka.de\/?p=9444"},"modified":"2016-07-20T01:02:39","modified_gmt":"2016-07-19T23:02:39","slug":"martian-meteorite-tissint-records-unique-petrogenesis-among-the-depleted-shergottites","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=9444","title":{"rendered":"Martian meteorite Tissint records unique petrogenesis among the depleted shergottites."},"content":{"rendered":"<p>Basu Sarbadhikari, A., Babu, E. V. S. S. K., Vijaya Kumar, T. and Chennaoui Aoudjehane, H.<\/p>\n<p>Meteoritics &#038; Planetary Science. doi: 10.1111\/maps.12684<br \/>\nVersion of Record online: 19 JUL 2016<\/p>\n<p><a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/maps.12684\/abstract\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n<p>&#8220;Tissint, a new unaltered piece of Martian volcanic materials, is the most silica-poor and Mg-Fe-rich igneous rock among the \u201cdepleted\u201d olivine-phyric shergottites. Fe-Mg zoning of olivine suggests equilibrium growth (<0.1 \u00b0C h\u22121) in the range of Fo80\u201356 and olivine overgrowth (Fo55\u201318) through a process of rapid disequilibrium (~1.0\u20135.0 \u00b0C h\u22121). The spatially extended (up to 600 \u03bcm) flat-top Fe-Mg profiles of olivine indicates that the early-stage cooling rate of Tissint was slower than the other shergottites. The chemically metastable outer rim of olivine (<Fo55) consists of oscillatory phosphorus zoning at the impact-induced melt domains and grew rapidly compared to the early to intermediate-stage crystallization of the Tissint bulk. High-Ca pyroxene to low-Ca pyroxene and high-Ca pyroxene to plagioclase ratios of Tissint are more comparable to the enriched basaltic and enriched olivine-phyric shergottites. Dominance of augite over plagioclase induced augite to control the Ca-buffer in the residual melt suppressing the plagioclase crystallization, which also caused a profound effect on the Al-content in the late-crystallized pyroxenes. Mineral chemical stability, phase-assemblage saturation, and pressure\u2013temperature path of evolution indicates that the parent magma entered the solidus and left the liquidus field at a depth of 40\u201380 km in the upper mantle. Petrogenesis of Tissint appears to be similar to LAR 06319, an enriched olivine-phyric shergottite, during the early to intermediate stage of crystallization. A severe shock-induced deformation resulted in remelting (10\u201315 vol%), recrystallization (most Fe-rich phases), and exhumation of Tissint in a time scale of 1\u20138 yr. Tissint possesses some distinct characteristics, e.g., impact-induced melting and deformation, forming phosphorus-rich recrystallization rims of olivine, and shock-induced melt domains without relative enrichment of LREEs compared to the bulk; and shared characteristics, e.g., modal composition and magmatic evolution with the enriched basaltic shergottites, evidently reflecting unique mantle source in comparison to the clan of the depleted members.\"\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Basu Sarbadhikari, A., Babu, E. V. S. S. K., Vijaya Kumar, T. and Chennaoui Aoudjehane, H. Meteoritics &#038; Planetary Science. doi: 10.1111\/maps.12684 Version of Record online: 19 JUL 2016 LINK &#8220;Tissint, a new unaltered piece&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,43,524,47],"tags":[2276,1828,1829,1885,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9444"}],"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=9444"}],"version-history":[{"count":5,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9444\/revisions"}],"predecessor-version":[{"id":9449,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/9444\/revisions\/9449"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}