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Nanofósiles Calcáreos Del Cretácico Superior Y Paleógeno De Patagonia, Argentina Concheyro, Graciela Andrea 1995

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Nanofósiles Calcáreos Del Cretácico Superior Y Paleógeno De Patagonia, Argentina Concheyro, Graciela Andrea 1995 Tesis de Posgrado Nanofósiles calcáreos del Cretácico Superior y Paleógeno de Patagonia, Argentina Concheyro, Graciela Andrea 1995 Tesis presentada para obtener el grado de Doctor en Ciencias Geológicas de la Universidad de Buenos Aires Este documento forma parte de la colección de tesis doctorales y de maestría de la Biblioteca Central Dr. Luis Federico Leloir, disponible en digital.bl.fcen.uba.ar. Su utilización debe ser acompañada por la cita bibliográfica con reconocimiento de la fuente. This document is part of the doctoral theses collection of the Central Library Dr. Luis Federico Leloir, available in digital.bl.fcen.uba.ar. It should be used accompanied by the corresponding citation acknowledging the source. Cita tipo APA: Concheyro, Graciela Andrea. (1995). Nanofósiles calcáreos del Cretácico Superior y Paleógeno de Patagonia, Argentina. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. http://digital.bl.fcen.uba.ar/Download/Tesis/Tesis_2754_Concheyro.pdf Cita tipo Chicago: Concheyro, Graciela Andrea. "Nanofósiles calcáreos del Cretácico Superior y Paleógeno de Patagonia, Argentina". Tesis de Doctor. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. 1995. http://digital.bl.fcen.uba.ar/Download/Tesis/Tesis_2754_Concheyro.pdf Dirección: Biblioteca Central Dr. Luis F. Leloir, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Contacto: [email protected] Intendente Güiraldes 2160 - C1428EGA - Tel. (++54 +11) 4789-9293 UNIVERSIDAD DE BUENOS AIRES FACULTAD DE CIENCIAS EXACTAS Y NATURALES Tema de Tesis Nanofósiles calcáreos del Cretácico Superior y Paleógeno de Patagonia, Argentina Autor Andrea Concheyro Director de Tesis Dr. Norberto Malumián Tesis presentada para optar a1 titulo de Doctor en Ciencias Geológicas 1995 TOMO I Buenos Aires, 8 de Agosto de 1995 Sr. Presidente de la Subcomisión de Doctorado del Depto. de Ciencias Geológicas Facultad de Ciencias Exactas y Naturales S j D.­ De mi mayor consideración: Tengo el agrado de dirigirme a Usted a fin de elevarle la Tesis Doctoral de la Lic. Andrea Concheyro que lleva por titulo "Nanofósiles calcáreos del Cretácico Superior y Paleógeno de Patagonia, Argentina". El trabajo se desarrolló en las regiones de Añelo, Provincia del Neuqúen; Lago Cardiel, Provincia de Santa Cruz; plataforma continental del Mar Argentino en cercanias a la isla de Tierra del Fuego y en las islas Marambio, Cerro Nevado y James Ross, Antártida. Se realizaron tareas de campaña y se investigaron cinco perforaciones de Total Austral, Yacimientos Carboniferos Fiscales yr de la Dirección Nacional del Servicio Geológico, que totalizaron aproximadamente 650 muestras y 140 determinaciones sistemáticas. El trabajo de tesis consistió en la caracterización de las asociaciones de nanofósiles reconocidas, sus aspectos sistemáticos y su aplicación estratígráfica. En la tarea sistemática la doctoranda realizó comparaciones directas del material con ejemplares extranjeros depositados en los laboratorios de Micropaleontologia del ETHZentrüm de Suiza y la Universita degli Studi di Parma, Italia. La investigación se llevó a cabo mediante las becas Doctoral y de Perfeccionamiento del CONICETycon lugar de trabajo en la Dirección Nacional del Servicio Geológico. Sin otro particular, saludo a Usted muy atentamente ,// x Dr. N. Malumián INDICE Tomo I AGRADECIMIENTOS.0.00......O...OI..-OOCOOOOOOOOIOOOOOIOIIOII I. INTRODUCCION I.B.Materia1estudiado..............................4I.A.Objetivos.......................................4 1.delmaterialestudiado.......................4 Localización geográfica I.C. EcologiadelNanoplanctoncalcáreo..............6 II. TECNICASII.A.Consideracionesgenerales......................9 DE PREPARACION II.B. Técnicas de preparación 1. Técnicas de preparación en el 0ptico(M.0)...............................10laboratorio para Microscopio 2. Recomendacionespara las preparaciones Barrido(M.E.B)............................12de Microscopio Electrónico de II.C. Observación de los nanofósiles calcáreosconM.0yM.E.B.....................12 III. ANTECEDENTES III.A. Antecedentesestratigráficos 1. Area de La Pampa, Neuquén y Rio Negro FormaciónRoca..........................17FormaciónJagüel.........................14 2. Area de Rio Turbio FormaciónCerroCazador..................21 FormaciónCerroDorotea..................24 FormaciónRioTurbio.....................27 FormaciónHanAike.......................31 3. Area de Tierra del Fuego costa afuera FormaciónArroyoAlfa....................34 FormaciónCabezadeLeón.................35 FormaciónCampoBola.....................37 4. Area de Islas James Ross, Antártida FormaciónLópezdeBertodano.............39 III.B.Antecedentesnanopaleontológicos.............44 2.0céanoAtlánticoSur......................481.ArgentinayChile.........................46 4.Antártida................................533. NuevaZelandayAustralia.................52 IV. MICROPALEONTOLOGIA IV.A.Micropaleontologiadelos perfiles............57 1.PerfilCerrosBayos........................572.Perfil.General.Roca........................59 3.PerfilOpaso...............................59 4. Perfil Bajadade.Jagüel....................62 5. Perfil PuestoSinNombre...................63 7.PerfilLomasColoradas.....................646. Perfil Jagüeldelos Rosauros..............63 8. Perfil K/T,Isla.Marambio..................64 9. PerfilIslaCerroNevado..........................67 Sanctuary Cliffs, 10. Perfil CaboHamilton,Isla J. Ross.........68 IV.B.Micropaleontologiadelas1.PerforaciónPoluxx-l......................69 perforaciones............69 2.PerforaciónYCF.T-136......................72 3. PerforaciónYCF.AdaroI...................73 4.5.SondeoSEC-7...............................73 PerforaciónYCF.AdaroII..................73 6.PerforaciónAJlenIII......................75 IV.C.deNanofósilesestudiadas..........................75 Diversidad de las asociaciones V. BIOESTRATIGRAFIA V.A. Usoenbioestratigrafia............................91 de los nanofósiles calcáreos V.E.Particularidadesbioestratigráficas............91 V.C.ZonacióndelCretácicoSuperior................93 1. Intervalo Albiano-Campaniano.................95 2.IntervaloCampaniano-Maestrichtiano.........98 V.D.ZonachmidelPaleógeno........................100 1.PaleocenoyrEoceno.........................100 V.E. Zonacióndelas secciones estudiadas..........104 VI. LIMITEVI.A. CRETACICO/PALEOGENO(K/P)Introducción VI.B.dellimiteK/P...............................113 Definición magnetoestratigráfica VI.C.nanofósileazalcáreos........................114 Estudios del limite K/P con 1. Asociacióndenanofósiles.... ........ ....114 2.contienenel11miteK/P...................115 Principales secciones que VI.D.Nanofósilescalcáreos........................121 Límite K/P de la Argentina. 1. Litologia.................................121 2.3. Paleontología.............................122Edad......................................123 VII. TAFONOMIA VII.A.diferencial.................................125 Procesos de disolución. Disolución VII.B.elmaterialestudiado.......................127 Preservación de los nanofósiles en VIII.VIII.A.sistemáticas...............................130 CONCLUSIONES VIII.B.Bioestratigráficas.........................130 VIII.C.Paleogeográficas...........................131 IXOBIBLIOGRAFIA...O00......OI...OOOOIIIOIOO00.000.00.00133 AGRADECIMIENTOS Al Consejo Nacional de Investigaciones Cientificas y Técnicas, por otorgar las becas Doctoral y de Perfeccionamiento que posibilitaron mi capacitación y el desarrollo de esta tesis. A la Dirección Nacional del Servicio Geológico de la Secretaria de Mineria, por haber brindado el lugar, sus laboratorios y todos los elementosnecesarios para la realización de este trabajo. A las empresas Total Austral, YCFe YPF por el material proveniente de sondeos para su análisis en el laboratorio. A las Autoridades del Instituto Antártico Argentino por facilitar la participación en numerosascampañasantárticas a fin de coleccionar material micropaleontológico y a los colegas de dicha Institución por su constante interés en las tareas de campo. Se desea agradecer especialmente al Director de esta Tesis, Doctor Norberto Malumián por haber propuesto el tema a desarrollar, por su dirección, consejo, muyvaliosas sugerencias durante la elaboración del trabajo y en el curso de los años de investigación bajo su tutela. A la Dra. Elena Mostajo por enseñar con dedicación los fundamentos del nanoplancton calcáreo y por su cordial ayuda en estos años de estudio. A la Lic. Gladys Angelozzi por facilitar importantes preparados para su comparación, interesarse en la discusión de problemas sistemáticos y su consejo permanente. A los Dres. Katherina Von Salis, Giuliana Villa y Abel Flores Villarejo por permitir examinar sus colecciones de nanofósiles cretácicos y paleógenos de secuencias europeas, y por sus constantes e inestimables consejos con referencia a las determinaciones sistemáticas, durante las estancias en el ETH Zentrum de Zurich, Suiza, la Universita degli Studi di Parma, Italia y en la Universidad de Salamanca, España: respectivamente. A la Lic. Adelma Bayarsky por los numerosos estudios de grano suelto realizados, su permanente colaboración y ayuda en diversos problemas de índole sedimentológica. A los Dres. Claudio Barrio, Silvio Casadio y M. Beatriz Aguirre Urreta por haber cedido importante material para el estudio de la secuencia del limite Cretácico-Paleógeno de la cuenca Neuquina. Al Dr. Eduardo Olivero y al Lic. Gervasio Robles Hurtado por facilitar valiosos perfiles para
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