{"id":328,"date":"2011-12-03T14:04:09","date_gmt":"2011-12-03T14:04:09","guid":{"rendered":"http:\/\/cms.impact-structures.com\/?page_id=328"},"modified":"2011-12-03T14:04:09","modified_gmt":"2011-12-03T14:04:09","slug":"impact-melt-rocks-shock-metamorphism-and-structural-features-in-the-rubielos-de-la-cerida-structure-spain-evidence-of-a-companion-to-the-azuara-impact-structure","status":"publish","type":"page","link":"http:\/\/estructuras-de-impacto.impact-structures.com\/?page_id=328","title":{"rendered":"Poster 3"},"content":{"rendered":"<p>IMPACT MELT ROCKS, SHOCK METAMORPHISM, AND STRUCTURAL FEATURES IN THE RUBIELOS DE LA C\u00c9RIDA STRUCTURE, SPAIN: EVIDENCE OF A COMPANION TO THE AZUARA IMPACT STRUCTURE<\/p>\n<p><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\">Kord Ernstson\u00a0<sup>1<\/sup>, Ferran Claudin\u00a0<sup>2<\/sup>, Ulrich Sch\u00fcssler\u00a0<sup>3<\/sup>, Francisco Anguita\u00a0<sup>4<\/sup>, Till Ernstson\u00a0<sup>5<\/sup><\/span><\/p>\n<p><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\">1 Fakult\u00e4t f\u00fcr Geowissenschaften, Universit\u00e4t W\u00fcrzburg,\u00a0<sup><strong>2<\/strong><\/sup>\u00a0IES Giola,\u00a0<sup><strong>3<\/strong><\/sup>\u00a0Institut f\u00fcr Mineralogie, Universit\u00e4t W\u00fcrzburg,\u00a0<sup><strong>4<\/strong><\/sup>\u00a0Departamento de Petrolog\u00eda y Geoqu\u00edmica, Universidad Complutense, Madrid,\u00a0<sup><strong>5<\/strong><\/sup>H\u00f6chberg<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/images\/image1021.jpg\" alt=\"\" width=\"269\" height=\"312\" border=\"0\" \/><br \/>\nFig.1. Location map for the Azuara (A) and Rubielos de la C\u00e9rida (R) structures.<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/125.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl0125.jpg\" alt=\"\" width=\"350\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.2. Impact melt (whitish ribbon; hammer for scale) embedded in megabreccia near Barrachina (M in Fig.5).<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/126.jpg\" target=\"_blank\"><img decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl0126.jpg\" alt=\"\" width=\"350\" border=\"0\" \/><\/a><br \/>\nFig.3. Silicate glass from the impact melt (field is 12 mm wide).<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/134.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl0134.jpg\" alt=\"\" width=\"350\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.4. Diaplectic glass and multiple sets of PDFs in quartz<br \/>\n(polymict breccia near Torrecilla; field is 400 \u00b5m wide).<br \/>\n<\/span><\/p>\n<p><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\"><strong><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/images\/image1111.jpg\" alt=\"\" width=\"273\" height=\"406\" border=\"0\" \/><br \/>\n<\/strong>Fig.5. Sketch-map of the Rubielos de la C\u00e9rida structure. 1 drainage pattern, 2 Paleozoic, Mesozoic and Lower Tertiary rocks, 3 Upper Tertiary and Quaternary rocks, 4 Pelarda Fm. ejecta, 5-10 Muschelkalk, Keuper, Jurassic, Cretaceous in the central uplift.About 50 km south of the Azuara impact structure (35 &#8211; 40 km diameter; Fig.1) [1, 2], the Rubielos de la C\u00e9rida structure is defined by a circular to elliptical basin with a diameter of roughly 40 km, a circular central uplift with a diameter of about 15 km and a 500 m stratigraphic uplift, and a geometrically associated drainage pattern (Fig.5). The most significant feature is the enormous compressive signature in the rocks including\u00a0<em>gries<\/em>\u00a0brecciation [3] (Fig.9) and continuous megabrecciation up to chaotic criss-cross layering nearly everywhere (Fig.10, 11). Apart from the general megabrecciation, all kinds of monomict and polymict breccias (Fig.8) and breccia dikes (Fig.6) occur. &#8211; Strong evidence for an impact origin of the Rubielos de la C\u00e9rida structure is given by the find of compact melt rocks within the structure between the central uplift and the northern rim. The melt rocks (silicate, carbonate, and phosphate melt) occur as blocks of variable size intermixed in a polymict megabreccia (Fig.2, 3). A petrographic description of these melts is given in [4]. &#8211; More evidence of impact signature in rocks from the Rubielos de la C\u00e9rida structure is given by the occurrence of shock metamorphism. We observe heavily disintegrated feldspars with strong mechanical twinning and multiple sets of PDFs, crossing sets of isotropic lamellae in twinned feldspars, diaplectic quartz and feldspar together with multiple sets of PDFs (Fig.4). Kinkbanding in mica from silicate Creataceous rocks and strong microtwinning in calcite are frequently observed. As a macroscopic shock feature, shatter cones can be found in Palaeozoic siltstones near Olalla. A peculiar shock phenomenon in Triassic Buntsandstein conglomerates surrounding the Rubielos de la C\u00e9rida structure is described in [5, 6]. An extended blanket of diamictites with strongly plastically deformed components, similar to the Pelarda Fm. ejecta of the Azuara impact structure [7], surrounds the Rubielos de la C\u00e9rida structure and is spectacularly exposed at the Puerto M\u00ednguez [8].Conclusions. &#8211; Based on current knowledge of impact cratering and impact structures, we conclude from the observations and features summarized here that Rubielos de la C\u00e9rida is an impact structure. This established, the neighbourhood to the Azuara structure and the stratigraphic age (Lower to Mid-Tertiary) of both structures makes a synchronous impact of a paired projectile very probable hence constituting the largest presently known terrestrial doublet impact structure.References<strong>:\u00a0<\/strong>&#8211; [1] Ernstson, K. et al., 1985, Earth Planet.Sci.Let., 74, 361-370. [2] Ernstson, K. and Fiebag, J., 1992, Geol. Rundschau, 81, 403-427. [3] H\u00fcttner, R., 1969, Geologica Bavarica, 61, 142-200. [4] Hradil, K. et al., this workshop. [5] Ernstson, K. et al., 2001, Geology, v. 29, 11-14. [6] Ernstson, K. et al., this workshop. [7]. Ernstson, K. and Claudin, F., 1990. N.Jb.Geol.Pal\u00e4ont.Mh., 1990, 581-599. [8] Claudin, F. et al., this workshop.<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/030.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl030.jpg\" alt=\"\" width=\"319\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.6. Shatter cones in Paleozoic siltstones (near Olalla; field is about 25 cm wide).\u00a0<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/078.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl078.jpg\" alt=\"\" width=\"350\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.7. Polymict dike breccia cutting Muschelkalk limestones (near Olalla; O in Fig.5).<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/102.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl0102.jpg\" alt=\"\" width=\"350\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.8. Multicolored ejecta deposited in the Pancrudo valley.\u00a0<\/span><a href=\"http:\/\/www.impaktstrukturen.de\/origi\/095.jpg\" target=\"_blank\"><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl095.jpg\" alt=\"\" width=\"350\" height=\"250\" border=\"0\" \/><\/span><\/a><\/p>\n<p><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\">Fig.9. Lower Tertiary limestone megablock showing heavy\u00a0<em>gries<\/em>\u00a0brecciation through and through. Note some preserved \u201eghost\u00bb layering. Near Barrachina.\u00a0<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/images\/image122.jpg\" alt=\"\" width=\"536\" height=\"89\" border=\"0\" \/><br \/>\nFig.10. Large-scale in situ brecciation of Jurassic limestones (SW of Bue\u00f1a).<br \/>\n<a href=\"http:\/\/www.impaktstrukturen.de\/origi\/064.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.impact-structures.com\/imagekl\/kl064.jpg\" alt=\"\" width=\"338\" height=\"250\" border=\"0\" \/><\/a><br \/>\nFig.11. Megabreccia (criss-cross layering) in Jurassic limestones (Bue\u00f1a).<\/span><\/p>\n<div><span style=\"font-family: 'Trebuchet MS', Helvetica, Geneva, Swiss, SunSans-Regular;\"><br \/>\n<\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>IMPACT MELT ROCKS, SHOCK METAMORPHISM, AND STRUCTURAL FEATURES IN THE RUBIELOS DE LA C\u00c9RIDA STRUCTURE, SPAIN: EVIDENCE OF A COMPANION TO THE AZUARA IMPACT STRUCTURE Kord Ernstson\u00a01, Ferran Claudin\u00a02, Ulrich Sch\u00fcssler\u00a03, Francisco Anguita\u00a04, Till Ernstson\u00a05 1 Fakult\u00e4t f\u00fcr Geowissenschaften, Universit\u00e4t W\u00fcrzburg,\u00a02\u00a0IES Giola,\u00a03\u00a0Institut f\u00fcr Mineralogie, Universit\u00e4t W\u00fcrzburg,\u00a04\u00a0Departamento de Petrolog\u00eda y Geoqu\u00edmica, Universidad Complutense, Madrid,\u00a05H\u00f6chberg Fig.1. Location &hellip; <a href=\"http:\/\/estructuras-de-impacto.impact-structures.com\/?page_id=328\" class=\"more-link\">Continuar leyendo<span class=\"screen-reader-text\"> \u00abPoster 3\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":318,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"sidebar-page.php","meta":{"footnotes":""},"class_list":["post-328","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Poster 3 - 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=\"http:\/\/estructuras-de-impacto.impact-structures.com\/?page_id=328\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Poster 3 - ERNSTSON CLAUDIN ESTRUCTURAS DE IMPACTO - CR\u00c1TERES METEOR\u00cdTICOS\" \/>\n<meta property=\"og:description\" content=\"IMPACT MELT ROCKS, SHOCK METAMORPHISM, AND STRUCTURAL FEATURES IN THE RUBIELOS DE LA C\u00c9RIDA STRUCTURE, SPAIN: EVIDENCE OF A COMPANION TO THE AZUARA IMPACT STRUCTURE Kord Ernstson\u00a01, Ferran Claudin\u00a02, Ulrich Sch\u00fcssler\u00a03, Francisco Anguita\u00a04, Till Ernstson\u00a05 1 Fakult\u00e4t f\u00fcr Geowissenschaften, Universit\u00e4t W\u00fcrzburg,\u00a02\u00a0IES Giola,\u00a03\u00a0Institut f\u00fcr Mineralogie, Universit\u00e4t W\u00fcrzburg,\u00a04\u00a0Departamento de Petrolog\u00eda y Geoqu\u00edmica, Universidad Complutense, Madrid,\u00a05H\u00f6chberg Fig.1. 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