{"id":399,"date":"2015-08-18T16:06:37","date_gmt":"2015-08-18T16:06:37","guid":{"rendered":"http:\/\/wdb.ugr.es\/~aperezl\/?page_id=399"},"modified":"2023-05-03T07:20:44","modified_gmt":"2023-05-03T07:20:44","slug":"triassic-epicontinental-facies","status":"publish","type":"page","link":"https:\/\/wpd.ugr.es\/~aperezl\/web\/?page_id=399","title":{"rendered":"Muschelkalk carbonates"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"color: #993300;\"><b>La Formaci\u00f3n <span class=\"SpellE\">Ceheg\u00edn<\/span><\/b><b> y la Formaci\u00f3n <span class=\"SpellE\">Siles<\/span> se han definido para caracterizar los carbonatos de <span class=\"SpellE\">facies<\/span> <span class=\"SpellE\">Muschelkalk<\/span> que afloran en las Zonas Externas de la Cordillera B\u00e9tica. Estas formaciones caracterizan los sedimentos depositados en el <span class=\"SpellE\">Paleomargen<\/span> <span class=\"SpellE\">Sudib\u00e9rico<\/span> durante el Tri\u00e1sico Medio. Sus <span class=\"SpellE\">facies<\/span> sedimentarias corresponden a dep\u00f3sitos de una plataforma <span class=\"SpellE\">epicontinental<\/span>, que en su primera etapa presentaban rasgos de rampa en sus m\u00e1rgenes. Esta plataforma fue evolucionando y sus dep\u00f3sitos fueron reflejando cada vez m\u00e1s sus rasgos de plataforma epicontinental de aguas poco profundas donde no eran frecuentes los dep\u00f3sitos de alta energ\u00eda salvo durante las tormentas. Se trataba de un extenso mar <span class=\"SpellE\">epicontinental<\/span> con escasas barreras, que hacia el este daba paso al mar del Tethys. <\/b><\/span><\/p>\n<p><strong><em>Facies<\/em><\/strong><strong><em>, <\/em><\/strong><strong>2008. Vol. 54, 61-87.<\/strong><\/p>\n<h4>Stratigraphy and sedimentology of Muschelkalk carbonates of the Southern Iberian Continental Palaeomargin (Siles and Ceheg\u00edn Formations, Southern Spain)<\/h4>\n<p>Fernando P\u00e9rez-Valera \u00b7 Alberto P\u00e9rez-L\u00f3pez<\/p>\n<p><strong>ABSTRACT<\/strong><\/p>\n<p style=\"text-align: justify;\">The Triassic sediments of the External Zones of the Betic Cordilla were deposited on the Southern Iberian Continental Palaeomargin. Two coeval Ladinian formations, namely the Siles Formation and the Ceheg\u00edn Formation, are described to illustrate the facies and lithostratigraphic variability in the Muschelkalk carbonates. There has been some dispute over the number of carbonate units present in the Siles Formation. Our studies assign a tectonic origin to these recurrent carbonate units. Both formations comprise only one carbonate unit, which is correlated to the Upper Muschelkalk of the Catalan and Germanic basins and some Iberian Range sections. To characterize the sedimentological features of these formations, 14 facies were defined. The most widespread sediment was originally lime mud, although bioclastic deposits are also common. In the facies succession, a main transgressive-regressive sequence could be identified. According to the facies model proposed here, a muddy coastal and shallow-water platform prograded over mid ramp deposits. There is no evidence for a seawards reefal or oolitic-bioclastic sandy barrier. The most significant feature of this sedimentary interpretation is that these carbonate facies show clear characteristics of an epicontinental platform.<\/p>\n<p style=\"text-align: center;\">***<\/p>\n<p><span style=\"color: #993300;\"><b>Las facies Muschelkalk se extienden por casi todos los afloramientos de la Pen\u00ednsula. Presenta facies muy similares pero, al mismo tiempo, existen variaciones de una subcuenca a otra. Una constante de estas facies es su car\u00e1cter somero. Los dep\u00f3sitos m\u00e1s frecuentes en algunos afloramientos son de tipo costero, llanuras de mareas y extensos lagoons que conforman una paleogegraf\u00eda compleja, que difiere con los modelos de plataformas con cinturones de facies.\u00a0<\/b><\/span><\/p>\n\n\n<p><strong>Sedimentary Geology 420 (2021) 105904<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Middle Triassic carbonates of Eastern Iberia (Western Tethyan Realm): A shallow platform model<\/strong><\/p>\n\n\n\n<p>Alberto P\u00e9rez-L\u00f3pez, Constantino Benedicto, Federico Ort\u00ed<\/p>\n\n\n\n<p><strong>ABSTRACT<\/strong><\/p>\n\n\n\n<p>Much of the eastern sector of the Mesozoic Iberian basin belongs to the \u2018Mediterranean type\u2019 Triassic. This type is characterized by a Middle Triassic stratigraphic record comprised of two carbonate Muschelkalk units (lower and upper) separated by a detrital-evaporite middle Muschelkalk unit. In the present study areas, the two first marine flooding episodes of the Middle Triassic led to the deposition of extensive shallow-water carbonates on a block controlled epicontinental platform in the lower and upper Muschelkalk units. These carbonates were part of third-order transgressive\u2013regressive sequences. The two carbonate sequences display similar vertical facies and stratigraphic sub-unit arrangements. The base of the two sequences is marked by a (lower) carbonate marl alternation, which was deposited in mixed tidal flat-to-lagoon settings. In the middle of the sequences, the carbonate character is predominant and facies associations mainly suggest shallow waters and high environmental variability. The change froma transgressive to regressive trend occurs in the middle of the sequences, although the position of the maximum flooding zone can vary fromone to another stratigraphic section. The tops of the sequences show two different lithological assemblages, which are coeval and grade laterally to each other. One assemblage is a \u2018carbonate terminal complex\u2019 formed by tidal flat and sabkha deposits,which is predominant in the lower Muschelkalk unit. The other assemblage is a lagoon-peritidal (upper) carbonate-marl alternation, predominant in the upper unit. Together, the two sequences suggest a complex platform morphology with a mosaic facies distribution, which evolved from a not very high energy ramp-like profile (transgressive phases, TST) to a lower energy rimmed shelf, ending with tidal\/lagoon environments (regressive phases, HST). Facies associations, however, suggest some what deeper depositional settings for the upper than lower Muschelkalk unit. Here we compare the two carbonate units in the study areas with those described in the literature from other Triassic basins of Eastern Iberia and the SW Germanic Basin, all forming part of the Peri-Tethys area of the Tethyan Realm.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-center\">***<\/p>\n\n\n\n<p class=\"has-text-color\" style=\"color:#860000\"><strong>El estudio continuado en los diferentes afloramientos de carbonatos del Tri\u00e1sico ha permitido descubrir y caracterizar una nueva formaci\u00f3n de facies Muschelkalk, pero de edad Anisiense. Se trata de los carbonatos del Muschelkalk inferior que no hab\u00edan sido identificados hasta ahora en la Zona Externa de la Cordillera B\u00e9tica. Presenta dep\u00f3sitos de facies muy someras, aunque presenta dos intervalos de sedimentos lut\u00edticos, que corresponden a ingresiones marinas, con f\u00f3siles que han permitido datar esta formaci\u00f3n. La interpretaci\u00f3n de estos carbonatos ha supuesto un avance en la reconstrucci\u00f3n paleogeogr\u00e1fica del Anisiense, para la cuenca B\u00e9tica.<\/strong>\u00a0<\/p>\n\n\n\n<p id=\"block-dec84022-1589-47f0-a6d4-d6ec256a27c1\"><strong>Sedimentary Geology 449 (2023)<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>First record of Anisian deposits in the Betic External Zone of southern Spain and its paleogeographical implications<\/strong><\/p>\n\n\n\n<p>Fernando P\u00e9rez-Valera, Alberto P\u00e9rez-L\u00f3pez, Annette E. G\u00f6tz, Sonia Ros-Franch, Ana M\u00e1rquez-Aliaga,<br>Jos\u00e9 Francisco Baeza-Carratal\u00e1, Juan Alberto P\u00e9rez-Valera<\/p>\n\n\n\n<p><a href=\"https:\/\/doi.org\/10.1016\/j.sedgeo.2023.106374\">https:\/\/doi.org\/10.1016\/j.sedgeo.2023.106374<\/a><\/p>\n\n\n\n<p id=\"block-2ba08f37-3cdf-468d-a3fb-df69c8da110f\"><strong>ABSTRACT<\/strong><\/p>\n\n\n\n<p>In the External Zone of the Betic Cordillera (S Spain), upper Muschelkalk (Ladinian) facies have been known for decades; however, so far there is no stratigraphic record of Anisian deposits. In the present study, new biostratigraphic data from a carbonate succession in the easternmost Subbetic domain reveal a Pelsonian-Illyrian (Anisian) age. The nautiloids Germanonautilus salinarius and Germanonautilus saharonicus are documented for the first time in the Iberian Peninsula, and together with the brachiopod Tetractinella trigonella and the bivalves Neoschizodus orbicularis and Myophoria vulgaris they represent marker fossils of Anisian deposits previously described from many other basins, both in the Germanic and Alpine realms. The co-occurrence of the nautiloid G. saharonicus and the bivalve Gervillia joleaudi at the top of the studied succession serves as correlation tool for the first faunal migration event from the Sephardic towards the Subbetic domain. The palynomorph assemblage, including the monosaccate pollen grain Cristianisporites triangulatus, provides further evidence of a late Anisian age. An integrated study of fossil assemblages and sedimentary facies reveals tidal and very shallowmarine environments that characterize an extensive epicontinental platform in the western Tethys along the paleo-margin of the Iberian Massif. Two thin shale intervals represent two distinct transgressive phases, correlative to the Pelsonian maximum-flooding zone recorded in other European basins. The new findings contribute to the ongoing paleogeographic reconstruction of epicontinental platform settings which developed during the<br>Middle Triassic in the Peri-Tethyan realm.<\/p>\n\n\n\n<p id=\"block-289f2a1b-c9a7-45a6-8acf-bdd7aaf079c7\">&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La Formaci\u00f3n Ceheg\u00edn y la Formaci\u00f3n Siles se han definido para caracterizar los carbonatos de facies Muschelkalk que afloran en las Zonas Externas de la Cordillera B\u00e9tica. Estas formaciones caracterizan los sedimentos depositados en el Paleomargen Sudib\u00e9rico durante el Tri\u00e1sico Medio. Sus facies sedimentarias corresponden a dep\u00f3sitos de una plataforma epicontinental, que en su primera <a href=\"https:\/\/wpd.ugr.es\/~aperezl\/web\/?page_id=399\" class=\"more-link\">...contin\u00faa leyendo<span class=\"screen-reader-text\"> \"Muschelkalk carbonates\"<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":12,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-399","page","type-page","status-publish","h-entry","hentry","h-as-page"],"_links":{"self":[{"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/pages\/399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=399"}],"version-history":[{"count":8,"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/pages\/399\/revisions"}],"predecessor-version":[{"id":1732,"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/pages\/399\/revisions\/1732"}],"up":[{"embeddable":true,"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=\/wp\/v2\/pages\/12"}],"wp:attachment":[{"href":"https:\/\/wpd.ugr.es\/~aperezl\/web\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}