{"id":83,"date":"2011-12-01T14:19:32","date_gmt":"2011-12-01T14:19:32","guid":{"rendered":"http:\/\/cms.impact-structures.com\/?p=83"},"modified":"2011-12-01T14:19:32","modified_gmt":"2011-12-01T14:19:32","slug":"regmaglypts-on-clasts-from-the-puerto-minguez-ejecta-azuara-multiple-impact-event-spain","status":"publish","type":"post","link":"http:\/\/estructuras-de-impacto.impact-structures.com\/?p=83","title":{"rendered":"Regmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain)"},"content":{"rendered":"

\"\"<\/p>\n

Fig. 1. Amazingly similar: Regmaglypts on the surface of the Tabor meteorite and on a limestone clast from the Puerto M\u00ednguez impact ejecta.<\/p>\n

Among the various deformation features exhibited by the carbonate clasts in the Puerto M\u00ednguez ejecta deposit (striae, nail prints, grooves, rotated fractures, irregular fractures with complex bifurcations, mirror polish, etc), regmaglypted clast surfaces are a prominent feature (Fig. 1). For the first time described by K. Ernstson (2004), they establish clear evidences of an aerial transport of quite a few clasts of the ejecta.<\/p>\n

 <\/p>\n

\"\"<\/p>\n

Source: Cascadia Meteorite Laboratory, Portland State University<\/p>\n

Fig. 2. A Gibeon meteorite exhibiting distinct regmaglypts.<\/strong><\/p>\n

Regmaglypts (or thumbprints) are reliefs commonly reported for the surface of some meteorites (Figs. 1, 2). The depressions originate from dynamic air pressure [continue<\/span><\/strong>\u00a0\u2026] and from selective erosion by material melting (ablation) off the surface of the meteorite on its passage through the atmosphere. The relief may show polygonal, spherical, rounded or elliptical shape, and a pattern like fingers over wet clay is frequent.<\/p>\n

We suggest the ablation features observed in the ejecta have originated from a similar process that is carbonate melting and ablation off the surface on the passage of the ejecta clasts through the heated impact explosion cloud.<\/p>\n

Of course, the depressions on the Puerto M\u00ednguez clasts in a way remind of lapi\u00e9s (karren) features on surfaces of exposed limestones. Lapi\u00e9s consist of shallow, straight grooves or runnels incised into the limestone by solution. Because of the striae and polish regularly coating the regmaglypted surfaces, and because the regmaglyptic clasts are embedded as individuals in the ejecta matrix (Fig. 3), an\u00a0in situ<\/em>\u00a0formation as lapi\u00e9s can clearly be excluded.<\/p>\n

\"\"<\/p>\n

Fig. 3. The regmaglypted individual embedded in the Puerto M\u00ednguez impact ejecta is incompatible with an\u00a0in situ<\/em>\u00a0dissolution (\u00ablapi\u00e9s\u00bb formation).<\/strong><\/p>\n

Alternatively, the \u00ablapi\u00e9s\u00bb depressions existed already before the impact and survived rock fracturing, excavation, and emplacement of the ejecta. This can be excluded because many clasts are regmaglypted all around (Fig. 4), and the frequently observed sharp-edged ridges of the regmaglypts (Fig. 4) would not have survived the excavation and ejection process.<\/p>\n

\"\"<\/p>\n

Fig. 4. Front and rear of a regmaglypted limestone clast from the Puerto M\u00ednguez ejecta. The regmaglypts all around and the sharp ridges exclude a \u00ablapi\u00e9s\u00bb formation before excavation and ejection.<\/strong><\/p>\n

In a few cases, the ablation by obvious carbonate melting of the clasts has eaten deeply into the clast (Fig. 5) reminding of similar distinct ablation features of some meteorites (Fig. 6).<\/p>\n

\"\"<\/p>\n

Fig. 5. A regmaglypted limestone clast from the Puerto M\u00ednguez ejecta exhibits prominent ablation reaching deeply inside into the limestone clast. For comparison see the meteoritic ablation features in Fig. 6.<\/strong><\/p>\n

\"\"<\/p>\n

Fig. 6. The Derrick Peak, Antarctica, meteorite. Image courtesy of NASA.<\/strong><\/p>\n

An extended article on the Puerto M\u00ednguez regmaglypted ejecta including many images can be read\u00a0here<\/a><\/span><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Fig. 1. Amazingly similar: Regmaglypts on the surface of the Tabor meteorite and on a limestone clast from the Puerto M\u00ednguez impact ejecta. Among the various deformation features exhibited by the carbonate clasts in the Puerto M\u00ednguez ejecta deposit (striae, nail prints, grooves, rotated fractures, irregular fractures with complex bifurcations, mirror polish, etc), regmaglypted clast … Continuar leyendo \u00abRegmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain)\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-83","post","type-post","status-publish","format-standard","hentry","category-impact-highlights"],"yoast_head":"\nRegmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain) - ERNSTSON CLAUDIN ESTRUCTURAS DE IMPACTO - CR\u00c1TERES METEOR\u00cdTICOS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/estructuras-de-impacto.impact-structures.com\/?p=83\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Regmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain) - ERNSTSON CLAUDIN ESTRUCTURAS DE IMPACTO - CR\u00c1TERES METEOR\u00cdTICOS\" \/>\n<meta property=\"og:description\" content=\"Fig. 1. Amazingly similar: Regmaglypts on the surface of the Tabor meteorite and on a limestone clast from the Puerto M\u00ednguez impact ejecta. Among the various deformation features exhibited by the carbonate clasts in the Puerto M\u00ednguez ejecta deposit (striae, nail prints, grooves, rotated fractures, irregular fractures with complex bifurcations, mirror polish, etc), regmaglypted clast … Continuar leyendo "Regmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain)"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/estructuras-de-impacto.impact-structures.com\/?p=83\" \/>\n<meta property=\"og:site_name\" content=\"ERNSTSON CLAUDIN ESTRUCTURAS DE IMPACTO - CR\u00c1TERES METEOR\u00cdTICOS\" \/>\n<meta property=\"article:published_time\" content=\"2011-12-01T14:19:32+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.impact-structures.com\/Archiv\/Fig.1.jpg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83\"},\"author\":{\"name\":\"admin\",\"@id\":\"http:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/#\\\/schema\\\/person\\\/2e88e6f7da0aa2fa15c3aa52693c981c\"},\"headline\":\"Regmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain)\",\"datePublished\":\"2011-12-01T14:19:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83\"},\"wordCount\":481,\"image\":{\"@id\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/www.impact-structures.com\\\/Archiv\\\/Fig.1.jpg\",\"articleSection\":[\"Aspectos destacables\"],\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83\",\"url\":\"https:\\\/\\\/estructuras-de-impacto.impact-structures.com\\\/?p=83\",\"name\":\"Regmaglypts on clasts from the Puerto M\u00ednguez ejecta, Azuara multiple impact event (Spain) - 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Amazingly similar: Regmaglypts on the surface of the Tabor meteorite and on a limestone clast from the Puerto M\u00ednguez impact ejecta. 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