Deriva continental y tectónica de placas
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Transcript of Deriva continental y tectónica de placas
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Geodinámica interna
Roberto Fernández Hojas
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Deriva continental y Tectónica de placas
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Alfred Wegener: 1880-1930
Alfred Wegener, físico y meteorólogo aleman, propuso una teoría revolucionaria para la época, la Teoría de la Deriva Continental, según la cual los continentes. podían desplazarse horizontalmente y que hace unos 300 millones de años estuvieron todos unidos formando un único supercontinente llamado Pangea. Su teoría fue totalmente rechazada y desacreditada a pesar de que Wegener aportopruebas sólidas para defenderla (geográficas, paleoclimáticas y paleontológicas).
El principal problema con el que Wegener se encontró fue no poder demostrar cual Era el mecanismo que movia los continentes.
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Evolución de las masascontinentales y oceánicasdesde el pérmico, hace 225 m.a.
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Pruebas geográficas Pruebas paleoclimáticas
Pruebas paleontólogicas
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Teoría de la Isostasia
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Teoría de la Tectónica de Placas
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Limites divergentes de placa Constructivos
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Cinturon de fuego del pacífico. 48.000 km
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Argentina
Chile
Bolivia
Perú
Ecuador
Colombia
Venezuela
Placa de Nazca
Placa Sudamericana
Cordillera Andina. 7.500 km de longitud
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Cerro Fitz Roy. 3375m
Capitan del Beagle.
Cordillera Andina. Argentina
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Machu Picchu. Perú. Poblado Inca 2438m
Cordillera Andina
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Aconcagua. Argentina. 6962m Cordillera Andina
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Cordillera del Himalaya
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Everest. 8.848 m Cordillera del Himalaya
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Cordillera pirenáica. 3.500 m Convergencia placa continental-continental
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Cordillera pirenáica. 3.500 m Convergencia placa continental-continental
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Islas Aleutianas (Arco Isla). Alaska
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Límites pasivos de placaFallas transformantes
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Puntos calientesHot spots
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Puntos calientes del planeta
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Formación de Arcos Islapor puntos calientes (Hot spots)
Los puntos calientesson manifestaciónes de efusividad magmática intraplaca
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Islas Hawai (Arco Isla). USAPunto caliente. Hot spot
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Volcanes
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Volcán vulcanianoVolcán estromboliano
Volcán Hawaiano
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Lavas aa
Lavas almohadilladasPillow-lavas
Lavas pahoehoe
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PiroclastosBombas volcánicas
PiroclastosLapilli
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Krakatoa, Indonesia. 813m
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Cotopaxi, Ecuador. 5897m
Tungurahua, Ecuador. 5023m
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Etna, Sicilia. 3.330 m
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Vesubio con la recreación de la ciudad de PompeyaNapoles. 1281 m
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Volcan Mauna Loa. Archipielago de Hawai. 4170 m
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krakatoa
cotopaxiMonte Olimpo, Marte. 27.000 m aprox.
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Terremotos
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