Publication: Conodontos del Carbonífero de la Meseta Central y de la Cuenca de Tindouf (Marruecos)
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2018-09-27
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Universidad Complutense de Madrid
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Abstract
En el presente trabajo se describen y analizan las diferentes asociaciones de conodontos registradas en doszonas de Marruecos, la región de Adarouch (Meseta Central) y la Cuenca de Tindouf. La región de Adarouch selocaliza en la parte noroeste de la Cuenca de AzrouKhenifra,que pertenece a la parte central de la Meseta Occidentalde Marruecos, y donde la sucesión carbonífera aflora en bandas de dirección NESOy está compuesta pordiversas formaciones, de las cuales Tizra, Mouarhaz, Akerhi, Idmarrach y Tirhela fueron muestreadas para conodontos.La Cuenca de Tindouf se localiza al sur de Marruecos y es un gran sinclinal cuyo eje presenta una direcciónaproximada ESENNO,aflorando parte del sinclinal al oeste de Algeria y norte de Mauritania. Su flanco norte esun gran escarpe que forma la cadena montañosa de Djebel Ouarkziz, donde se levantaron varias secciones estratigráficasque componen la sección compuesta de Tinguiz Remz. En esta sección se encuentran representadas formacionescarboníferas de Betaina y Ouarkziz, las cuales fueron muestreadas para conodontos. Entre ambasregiones se tomaron 168 muestras lo que implicó un total de 465,8491 kg de roca para procesar en laboratorio y14,0051 kg de residuo sólido insoluble para ser triado posteriormente, obteniéndose 5921 elementos conodontalesentre la región de Adarouch y la Cuenca de Tindouf.En el conjunto de las formaciones de la región de Adarouch se han identificado hasta 10 géneros, 18 especiesy 9 subespecies de taxones multielementales de conodontos donde Gnathodus bilineatus y Gnathodus girtyi,Lochriea commutata, Idioprioniodus claviger, Idioprioniodus conjunctus, Kladognathus tenuis/complectens y“Gnathodus“ homopunctatus son los taxones más comunes. En menor número se registran Mestognathus,Synclydognathus, Cavusgnathus y Vogelgnathus. Las asociaciones de conodontos más abundantes provienen dela parte superior de la Fm Tizra, donde se registra una fauna indicativa de ambientes relativamente profundos enla plataforma externa y que se caracteriza por la biofacies de Idioprioniodus, definida por el predominio de Idioprioniodusy, de Gnathodus y Lochriea...
This Ph.D. Thesis is focused on the different conodont assemblages recovered from the Adarouch region (CentralMeseta) and the Tindouf basin (Morocco). The Adarouch region is situated to the northwest of the AzrouKhenifraBasin, in the central part of the Western Meseta, where the Carboniferous succession crops out in NESWorientedstrips and where the Tizra, Mouarhaz, Akerchi and Tirhela formations were sampled for conodonts. The TindoufBasin is a vast syncline with its major axis oriented ESENNW,situated between southern Morocco and westernAlgeria and to the north of Mauritania. Its northern limb constitutes a major escarpment, the Djebel Ouarkziz mountainrange, in which several stratigraphic sections were studied in the composite section of Tinguiz Remz. In thissection, the Betaina and Ouarkziz formations were studied for conodonts. In both regions, 168 levels where sampledfor conodonts, implying a total of 465.8491 kg of rocks processed in the laboratory and 14.0051 kg of solid insolubleresidue for picking. In total, 5921 conodonts were recovered.Conodonts of the formations of the Adarouch region could be ascribed to 10 different multielemental genera ofwhich 18 species and 9 subspecies were identified. The main and most abundant taxons recorded are, Gnathodusbilineatus y Gnathodus girtyi, Lochriea commutata, Idioprioniodus claviger, Idioprioniodus conjunctus, Kladognathustenuis/complectens and “Gnathodus“ homopunctatus, whereas Mestognathus, Synclydognathus, Cavusgnathusand Vogelgnathus are less common, sometimes constituting a minor component in certain assemblages. Theupper part of the Tizra Fm contains the most abundant assemblage of conodonts representative of relatively deepwaterenvironments in an external platform and where the dominance of Idioprioniodus as well as Gnathodus andLochriea has allowed the recognition of the Idioprioniodus biofacies...
This Ph.D. Thesis is focused on the different conodont assemblages recovered from the Adarouch region (CentralMeseta) and the Tindouf basin (Morocco). The Adarouch region is situated to the northwest of the AzrouKhenifraBasin, in the central part of the Western Meseta, where the Carboniferous succession crops out in NESWorientedstrips and where the Tizra, Mouarhaz, Akerchi and Tirhela formations were sampled for conodonts. The TindoufBasin is a vast syncline with its major axis oriented ESENNW,situated between southern Morocco and westernAlgeria and to the north of Mauritania. Its northern limb constitutes a major escarpment, the Djebel Ouarkziz mountainrange, in which several stratigraphic sections were studied in the composite section of Tinguiz Remz. In thissection, the Betaina and Ouarkziz formations were studied for conodonts. In both regions, 168 levels where sampledfor conodonts, implying a total of 465.8491 kg of rocks processed in the laboratory and 14.0051 kg of solid insolubleresidue for picking. In total, 5921 conodonts were recovered.Conodonts of the formations of the Adarouch region could be ascribed to 10 different multielemental genera ofwhich 18 species and 9 subspecies were identified. The main and most abundant taxons recorded are, Gnathodusbilineatus y Gnathodus girtyi, Lochriea commutata, Idioprioniodus claviger, Idioprioniodus conjunctus, Kladognathustenuis/complectens and “Gnathodus“ homopunctatus, whereas Mestognathus, Synclydognathus, Cavusgnathusand Vogelgnathus are less common, sometimes constituting a minor component in certain assemblages. Theupper part of the Tizra Fm contains the most abundant assemblage of conodonts representative of relatively deepwaterenvironments in an external platform and where the dominance of Idioprioniodus as well as Gnathodus andLochriea has allowed the recognition of the Idioprioniodus biofacies...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Geológicas, Departamento de Paleontología, leída el 09-06-2017