{"id":20483,"date":"2019-09-28T10:23:39","date_gmt":"2019-09-28T08:23:39","guid":{"rendered":"http:\/\/karmaka.de\/?p=20483"},"modified":"2019-09-28T10:23:43","modified_gmt":"2019-09-28T08:23:43","slug":"new-observations-on-high%e2%80%90pressure-phases-in-a-shock-melt-vein-in-the-villalbeto-de-la-pena-meteorite-insights-into-the-shock-behavior-of-diopside","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=20483","title":{"rendered":"New observations on high\u2010pressure phases in a shock melt vein in the Villalbeto de la Pe\u00f1a meteorite: Insights into the shock behavior of diopside"},"content":{"rendered":"\n<p>Marina Martinez, Adrian J. Brearley, Josep M. Trigo\u2010Rodr\u00edguez, Jordi Llorca<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<br>\nFirst Published: 27 September 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13391\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The petrology and mineralogy of shock melt veins in the L6 ordinary chondrite host of Villalbeto de la Pe\u00f1a, a highly shocked, L chondrite polymict breccia, have been investigated in detail using scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and electron probe microanalysis. Entrained olivine, enstatite, diopside, and plagioclase are transformed into ringwoodite, low\u2010Ca majorite, high\u2010Ca majorite, and an assemblage of jadeite\u2010lingunite, respectively, in several shock melt veins and pockets. We have focused on the shock behavior of diopside in a particularly large shock melt vein (10 mm long and up to 4 mm wide) in order to provide additional insights into its high\u2010pressure polymorphic phase transformation mechanisms. We report the first evidence of diopside undergoing shock\u2010induced melting, and the occurrence of natural Ca\u2010majorite formed by solid\u2010state transformation from diopside. Magnesiow\u00fcstite has also been found as veins injected into diopside in the form of nanocrystalline grains that crystallized from a melt and also occurs interstitially between majorite\u2010pyrope grains in the melt\u2010vein matrix. In addition, we have observed compositional zoning in majorite\u2010pyrope grains in the matrix of the shock\u2010melt vein, which has not been described previously in any shocked meteorite. Collectively, all these different lines of evidence are suggestive of a major shock event with high cooling rates. The minimum peak shock conditions are difficult to constrain, because of the uncertainties in applying experimentally determined high\u2010pressure phase equilibria to complex natural systems. However, our results suggest that conditions between 16 and 28 GPa and 2000\u20132200 \u00b0C were reached.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Marina Martinez, Adrian J. Brearley, Josep M. Trigo\u2010Rodr\u00edguez, Jordi Llorca Meteoritics &amp; Planetary Science First Published: 27 September 2019 LINK &#8220;The petrology and mineralogy of shock melt veins in the L6 ordinary chondrite host of&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7,63],"tags":[1481,3188,3968,3661,1844,606,4481,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20483"}],"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=20483"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20483\/revisions"}],"predecessor-version":[{"id":20484,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20483\/revisions\/20484"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}