{"id":326,"date":"2011-12-03T14:02:53","date_gmt":"2011-12-03T14:02:53","guid":{"rendered":"http:\/\/cms.impact-structures.com\/?page_id=326"},"modified":"2011-12-03T14:02:53","modified_gmt":"2011-12-03T14:02:53","slug":"striae-polish-imprints-rotated-fractures-and-related-features-from-clasts-in-the-puerto-minguez-impact-ejecta-ne-spain","status":"publish","type":"page","link":"http:\/\/estructuras-de-impacto.impact-structures.com\/?page_id=326","title":{"rendered":"Poster 2"},"content":{"rendered":"

STRIAE, POLISH, IMPRINTS, ROTATED FRACTURES, AND RELATED FEATURES FROM CLASTS IN THE PUERTO M\u00cdNGUEZ IMPACT EJECTA (NE SPAIN<\/strong>)<\/p>\n

Ferran Claudin 1, Kord Ernstson 2, Michael R. Rampino 3, Francisco Anguita 4<\/h2>\n

1 IES Giola,\u00a02<\/sup>\u00a0Fakult\u00e4t f\u00fcr Geowissenschaften, Universit\u00e4t W\u00fcrzburg,\u00a03<\/sup>\u00a0New York University & NASA Goddard Institute for Space Studies, 4 Departamento de Petrolog\u00eda y Geoqu\u00edmica, Universidad Complutense, Madrid<\/span><\/p>\n

The Puerto M\u00ednguez (Fig.1) was first described as the location of an \u00abenigmatic\u00bb deposit of Paleozoic quartzite clasts [1]. By road construction meanwhile continuously exposed over 5 km length, the deposit is now considered part of an enormous impact ejecta blanket around the Azuara and Rubielos de la C\u00e9rida twin impact structures [2, 3].<\/span><\/p>\n

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\n<\/span>Fig.1. Location map for the Puerto M\u00ednguez. Encircled are the Azuara and Rubielos de la C\u00e9rida impact structures.<\/span><\/p>\n

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\n<\/span>Fig.2. Typical diamict aspect of the impact ejecta.<\/span><\/p>\n

Stratigraphically, the Puerto M\u00ednguez deposits consist of uncemented and frequently intermixed Paleozoic, Mesozoic, and Lower Tertiary material. The mixed cobble and block components show variable morphology (well-rounded, sub-rounded, and angular), and are supported by a sandy and marly matrix. Megablocks with preserved stratification and original characteristics are also intermixed within the deposit.<\/span><\/p>\n

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\n\"\"\"\"
\n<\/span>Fig.3. Mesoscopic deformations in the Puerto M\u00ednguez impact ejecta: Striae, grooves, polish, imprints, and faceted sculpture.<\/span><\/p>\n

Most of the pebbles, cobbles and blocks are strongly deformed (Figs.3-5). They show striations all around (including nailhead striae), penetration marks, deep grooves, rotated fractures, and irregular fractures with complex bifurcations. An intense internal torsion of many cobbles and blocks is documented by hinges and rotated fractures (Fig.4). The rotated fractures (first described for the Pelarda Fm. ejecta [4]), may result from pure torsion, or from a superposition of torsion and tension. Fractured components frequently resemble bread cut into slices, but the clasts remain coherent (as do the clasts with the rotated fractures), and are not broken into pieces (Fig.5).<\/span><\/p>\n

\"\"\"\"
\n<\/span>Fig.4. Rotated fractures in clasts from the Puerto M\u00ednguez ejecta.<\/span><\/p>\n

\"\"\"\"\"\"
\n<\/span>Fig.5. \u00abBread-cut-to-slices\u00bb features in a clast from the Puerto M\u00ednguez ejecta (left) and from the Ries Crater Bunte Breccia ejecta (Belemnite rostra and carbonate concretion, middle and right).<\/span><\/p>\n

Conclusions. – From the analysis of the lithologic characteristics, surface features, and intense deformations of the components and the matrix of the Puerto Minguez deposits, we conclude that the origin of these features is connected with simultaneous plastic and brittle deformation, acting rapidly, and under high contact pressure between the matrix and larger components. Especially the rotated fractures and the \u00abbread-cut-to-slices features\u00bb are regarded as typical of dynamic, rapid deformation. Deformations as observed at the Puerto M\u00ednguez occur under high confining pressure in an impact event and are observed in other impact ejecta (e.g., the Ries Crater (Fig.5), the Azuara and the Chicxulub impact structures) [4-6, and others]. They are not compatible with an origin from fluvial deposition, quasi-static tectonics, the action of glaciers, or syn-tectonic sedimentation [11].<\/span><\/p>\n

The observations and analyses presented here may serve as a strong diagnostic tool for impact-related diamictites.<\/span><\/p>\n

References: [1] Moissenet, E.\u00a0et al.<\/em>\u00a0(1972)\u00a0Melanges casa Velazquez<\/em>,\u00a08<\/strong>: 1-47; [2] Ernstson, K. et al., 1985, Earth Planet.Sci.Let., 74, 361-370 [3] Ernstson, K. et al., this workshop; [4] Ernstson, K. and Claudin, F., 1990. N.Jb.Geol.Pal\u00e4ont.Mh., 1990, 581-599; [5] Rampino, M.R.\u00a0et al.<\/em>\u00a0(1997)\u00a0Abstracts Conference on Large Meteorite Impacts & Planetary Evolution, Sudbury, Ontario, Canada;<\/em>\u00a0[6] Chao, E.C.T. (1976)\u00a0Science<\/em>,\u00a0194<\/strong>: 615-618; [7] Casas, R.\u00a0et al.<\/em>\u00a0(2000)\u00a0Geodinamica Acta<\/em>\u00a0, n\u00ba , 1-17.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

STRIAE, POLISH, IMPRINTS, ROTATED FRACTURES, AND RELATED FEATURES FROM CLASTS IN THE PUERTO M\u00cdNGUEZ IMPACT EJECTA (NE SPAIN) Ferran Claudin 1, Kord Ernstson 2, Michael R. Rampino 3, Francisco Anguita 4 1 IES Giola,\u00a02\u00a0Fakult\u00e4t f\u00fcr Geowissenschaften, Universit\u00e4t W\u00fcrzburg,\u00a03\u00a0New York University & NASA Goddard Institute for Space Studies, 4 Departamento de Petrolog\u00eda y Geoqu\u00edmica, Universidad Complutense, … Continuar leyendo \u00abPoster 2\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-326","page","type-page","status-publish","hentry"],"yoast_head":"\nPoster 2 - 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=326\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Poster 2 - ERNSTSON CLAUDIN ESTRUCTURAS DE IMPACTO - CR\u00c1TERES METEOR\u00cdTICOS\" \/>\n<meta property=\"og:description\" content=\"STRIAE, POLISH, IMPRINTS, ROTATED FRACTURES, AND RELATED FEATURES FROM CLASTS IN THE PUERTO M\u00cdNGUEZ IMPACT EJECTA (NE SPAIN) Ferran Claudin 1, Kord Ernstson 2, Michael R. 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