La Clasificación Geomorfológica De La

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La Clasificación Geomorfológica De La SIMPOSIO REGIONAL SOBRE EL NOROESTE DE MÉXICO SRSNM-01 aeromagnetométrico efectuado recientemente por el Consejo de Recursos Minerales (CoReMi). LA CLASIFICACIÓN GEOMORFOLÓGICA DE LA COSTA ROCOSA EN LA ISLA ESPÍRITU SANTO E Las unidades litomagnéticas interpretadas en las cartas son de ISLA PARTIDA, BAJA CALIFORNIA SUR Y SU la más antigua a la más reciente: IMPORTANCIA PARA EL PROGRAMA DE 1. Basamento de la cuenca, constituido por rocas aflorantes de CONSERVACIÓN Y MANEJO INSULAR afinidad volcano-sedimentaira (de edad mesozoicas o cenozoicas) y rocas graníticas de edad cretácica-terciaria (unidades Cruz Orozco Rodolfo y Javier Gaitán Morán litomagnéticas A1-A2 y B1-B2 de los afloramientos). Depto. de Geología Marina, UABCS 2. Unidad epiclástica de edad miocena, constituida por depósitos La totalidad de las islas en el Golfo de California contienen de abanicos aluviales y de planicie costera (unidades altos valores naturales y son consideradas sitios de interés litomagnéticas A1 y C1) científico. Por estas importantes razones han sido declaradas áreas protegidas con la finalidad de conservar aquellos valores mediante 3. Unidad evaporítica de edad miocena temprana (unidad programas adecuados de manejo. El caracterizar los ambientes físico litomagnética C1) y biológico, a través de la identificación cuantitativa y cualitativa de los recursos naturales, es crucial para el diseño y operación de estos 4. Unidad sedimentaria marina (lutita silicificada miocénica programas. temprana (unidad litomagnética C1) La Isla Espíritu Santo e Isla Partida cubren un área de 99 km2 Unidad epiclástica fluvial que represnta la unidad más joven y se localizan a 28 kilómetros al noreste de la ciudad de La Paz, (plio-pleistocena) que representa el sistema paleodeltaico del B.C.S. Forman parte del complejo insular del Golfo de California y antiguo arroyo de La Poza, predecesor del actual Río Sonoracuyo al igual que la mayoría de las islas que se encuentran en el Golfo, delta ha aprovechado el relieve negativo para cubrir toda la zona, han sido originadas por eventos geológicos y permanecen como parcialmente. remanentes de una compleja historia geológica; en donde la combinación de procesos de emergencia, sumergencia, erosión y SRSNM-03 volcanismo se han presentado de manera continua, desde hace cinco millones de años, cuando se inició la separación de la Península de LA GEOLOGÍA DEL VALLE DEL YAQUI Y ÁREAS Baja California del macizo continental mexicano y se formó la ADYACENTES cuenca que ahora ocupa el Golfo. Rodrigo González Enríquez1,2 y Luis Ernesto Marín Stillman2 La herencia geomorfológica y geológica de la Isla Espíritu 1 Instituto Tecnológico de Sonora Santo e Isla Partida, al igual que las islas restantes ubicadas en el 2 Instituto de Geofísica, UNAM Golfo, es increíblemente rica y variada en geoformas. El conocimiento y entendimiento de la geomorfología y de la geología, La zona de estudio comprende al Valle del Yaqui y áreas en términos la de historia evolutiva y la operación de los procesos adyacentesincluye y se localiza en el Noroeste de México (26°45' a naturales contemporáneos es esencial para explicar la dinámica de 29°00' Latitud Norte y 109°00' a 111°15' de Longitud Oeste). Al las formas del relieve costero rocoso actual. Este del Golfo de California en el Estado de Sonora. En la región se identifican 15 unidades cronoestratigráficas que dieron origen al Lo anterior representa una información fundamental para el desarrollo de la geología regional, las cuales están comprendidas programa de conservación y manejo insular ya que permite entre el Paleozoico, Mesozoico y Cenozoico. determinar como han y continúan operando los procesos naturales. De esta manera pueden predecirse posibles cambios futuros de las Del Paleozoico afloran tres tipos de unidades estratigráficas, formas del relieve, sobre una base cuantitativa y cualitativa, y todas son del Paleozoico Sedimentario Marino. Del Mesozoico se mantener la dinámica natural de las formas del relieve costero reportan cuatro unidades estratigráficas: una Sedimentaria Mixta, rocoso y de los afloramientos geológicos asociados, contribuyendo dos Volcánicas y una Intrusiva. El Cenozoico esta compuesto por así a la solución de problemas ambientales, de planeación e diez unidades estratigráficas, de las cuales son tres Sedimentarias ingeniería. Continentales, una Volcanosedimentaria Continental, cinco Volcánicas y una Intrusiva. SRSNM-02 La historia geológica del Valle del Yaqui inicia con la INTERPRETACION DE MODELOS sedimentación de rocas calcáreas que termina a fines del Pérmico, CARTOGRAFICOS NUMERICOS DEL período en el que a consecuencia de la Orogenia Sonorana el mar LEVANTAMIENTO DE LAS HOJAS H12-8 Y H12-11 pierde profundidad, emergiendo una superficie que queda sujeta a DEL LEVANTAMIENTO AEROMAGNETOMETRICO un largo período de erosión. A fines del Cretácico y principios del DEL COREMI EN EL ESTADO DE SONORA Terciario ocurre la Revolución Laramide, presentándose una intensa actividad estructural manifestada por emisiones lávicas, intrusiones Rodriguez-Torres Rafael y Rangel-Medina Miguel ácidas, fenómenos de plegamientos y fallamientos que afectaron la RENATURA mayor parte de las sierras existentes en la región. La emisión de lavas andesíticas y riolíticas descansan sobre un basamento Se interpretaron geológicamente la mitad oeste del borde sur de probablemente Cretácico. la hoja Hermosillo (H12-8) y las dos terceras partes de la mitad oeste de la hoja Sierra Libre (H12-11), del levantamiento 313 SIMPOSIO REGIONAL SOBRE EL NOROESTE DE MÉXICO A finales del Terciario un período de intensa erosión formó y 70 Ma, localizadas a unos 100 km de la costa. (6) Valores iniciales depósitos de conglomerados y areniscas. En el Cuaternario, la negativos de Nd (-3.22 a -6.29) y relaciones de 87Sr/86Sr altas erosión continuó sobre todas las rocas expuestas en la región, (0.706101 - 0.710197), salvo para los granitos de la costa, sugieren formando depósitos de talud, abanicos aluviales y los rellenos la presencia de corteza continental en la génesis de los magmas. Las recientes del valle. En este periodo, la erosión de los diversos características geoquímicas e isotópicas diferentes de los granitos de agentes y el acarreo efectuado por los ríos, provocó el depósito del la costa sugieren una corteza menos evolucionada quizás incluyendo material de aluvión formándose la llanura, y al acumularse en la basamentos, acrecionados al continente antes del ciclo laramídico. desembocadura de los ríos formó barreras que dieron origen a los esteros, a lo que contribuyó el mar provocando un ligero SRSNM-05 levantamiento de la costa en crecimiento y resultando que el depósito de aluvión alcanzara una amplia extensión que cubre casi DISCORDANT PALEOMAGNETIC DATA FOR MID- la totalidad de la parte baja de la llanura. Al avanzar la costa sobre CRETACEOUS INTRUSIVE ROCKS FROM los depósitos salinos del mar, estos fueron cubiertos quedando NORTHERN BAJA CALIFORNIA: LATITUDE zonas saladas atrapadas en los lugares donde existieron esteros. DISPLACEMENT, TILT, OR VERTICAL AXIS ROTATION? SRSNM-04 Harald Böhnel1, Luis A. Delgado-Argote2 and Dave CARACTERISTICAS Y EVOLUCION DEL Kimbrough3 MAGMATISMO LARAMIDICO EN LA PORCION 1 UNICIT, UNAM SUR DEL BATOLITO DE SONORA, MEXICO 2 Depto. de Geología, CICESE 3 San Diego State University Roldán-Quintana Jaime, Calmus Thierry y Valencia-Moreno Martin Both a series of dikes named San Marcos and the Testerazo Instituto de Geología, Estación Regional del Noroeste, UNAM Pluton which apparently has intruded them afterwards, have been studied paleomagnetically to address the question of the El magmatismo laramídico en Sonora inició durante el paleogeographic position of this part of Baja California. Testerazo Cretácico Tardío y continuó hasta el Eoceno Tardío (90-40 Ma) y ha belongs to the Cretaceous (»100-120 Ma) Peninsular Ranges sido relacionado con la subducción de la placa oceánica Farallón Batholith and U/Pb data indicate that the dikes are almost coeval. debajo de la de Norte América. Los modelos de evolución The dikes are consistently dipping towards the southwest which may magmática en relación a la convergencia de las placas Kula y indicate that the area experienced regional tilt. All but one of 36 Farallón con la placa de Norte América durante el Mesozoico y el sites show remanence of normal polarity, thus suggesting that the Terciario han sido establecidos principalmente a partir del estudio thermoremanent magnetization was acquired around the initiation of en el suroeste de Estados Unidos (los batolitos de las sierras the Cretaceous Normal Supercron. Paleopoles for San Marcos and Peninsulares y el de la Sierra Nevada) y extendiendo los resultados Testerazo are indistinguishable and were combined into a paleopole hacía el noroeste de México (Lipman et al., 1972; Silver y Chappel, at 248°E/86.6°N, A95=4.8°, which is displaced with respect to the 1988, Urrutia-Fucugauchi y Morton-Bermea, 1997; Clark et al., 122 Ma reference pole for stable North America at 185.6°E/72.3°N, 1982; Ortega-Rivera, 1997). A95=3.3°. The displacement may be described by a clockwise rotation of 14-18 ± 6° and a northward shift of 3-8 ± 6°. Restoring Varios parámetros han sido utilizados para explicar la orogenia a northward shift of about 3°, related to the separation of Baja larámidica, entre ellos el aumento de la velocidad de convergencia California from North America during the last 10 Ma, only a desde 60 hasta 150 km/m.a. entre 75 y 40 Ma (Engebretson et al., marginal northward displacement of 0-5 ±
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