Unidades litoestratigráficas del Cenozoico en el Perú 2 respuestas
Cuadro de correlaciones estratigráficas del Perú
En el post anterior perteneciente a esta sección se mostró las unidades litoestratigráficas del Cretáceo y Jurásico, en esta ocasión y al fin, pude finalizar el esquema litoestratigráfico del Cenozoico de acuerdo a las zonas geomorfológicas del Perú y sus respectivas áreas (área norte, centro y sur) detallando un poco más sobre la cronoestratigrafía. Cabe resaltar que este esquema geológico está basado en el gráfico presente en la publicación “Geología del Perú” por el INGEMMET del año 1995. Por tal razón, los esquemas digitales que muestro muestro en posts anteriores pertenecen a la publicación del mismo nombre. Las líneas discontinuas entre las distintas formaciones ó grupos representan discordancias geológicas (no se especifica de qué tipo son). La imagen se puede observar y/o descargar haciendo clic sobre ella.
Luis Ayala Carazas. P.A.Ck
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Esta entrada se publicó en Geología del Perú y está etiquetada con Litoestratigrafía del Perú en 18 octubre, 2010. 2010 .
Unidades litoestratigráficas del Cretáceo y Jurásico en el Perú 5 respuestas
Cuadro de correlaciones estratigráficas del Perú
Las formaciones geológicas del Cretáceo y Jurásico se encuentran resumidas dentro de estos esquemas realizados por el INGEMMET (Carta geológica nacional, escala 1/100000), los cuales correlacionan las unidades litológicas de acuerdo a la cronoestratigrafía y a la posición de éstas según la zona geomorfológica del Perú donde afloran. Esta es una versión digital del cuadro de correlaciones que se encuentra en el libro “Geología del Perú” publicado por el INGEMMET el año 1995. La imagen se puede descargar haciendo clic izquierdo sobre la imagen. Cretáceo
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Esta entrada fue publicada en Geología del Perú el 26 julio, 2010. 2010 .
Formaciones geológicas del Perú 13 respuestas
A lo largo de los años los geólogos regionales se han encargado de cartografiar y clasificar estratigráficamente los distintos afloramientos de rocas sedimentarias y hallar las relaciones espaciales que éstas tienen con las grandes unidades de rocas ígneas y volcánicas que existen a lo largo del territorio peruano. La institución encargada de este trabajo es el INGEMMET (Instituto Geológico Minero y Metalúrgico), y ya desde los años sesenta se comenzó con el proyecto de la Carta Geológica Nacional (Escala 1:100000) la cual tenía y tiene como objetivo principal develar todo rasgo geológico – geológico – estructural estructural de nuestro país.
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geológica tenía distintas edades en hojas del mismo cuadrángulo, etc. Es algo que muchos habrán notado al momento de realizar perfiles geológicos o tan sólo de observar con algo de detenimiento, pero en sí, todo este arduo trabajo es una obra maestra de los geológos de aquel tiempo que se esmeraron por hacer algo diferente e innovador. Los nuevos cuadrángulos que se realizan en INGEMMET son más detallados a escala 1:50000 (4 mapas por cuadrángulo anterior) y con estudios más orientados hacia un avance científico acerca de una zona en específico del Perú, en resumen, la geología es una ciencia que evoluciona constantemente, con teorías y descubrimientos que se dan de acuerdo al avance de la tecnología. Los usos del mapas están orientados para el uso científico, ambiental, ingenieril (ingeniería geológica, ingeniería civil, geotecnia), petrolero (exploración y explotación de hidrocarburos) y minero (recursos minerales) ya que éste mapa proporciona una idea general de los posibles ambientes de ocurrencia de dichos recursos naturales. Por tal motivo expongo los distintos afloramientos de rocas que he podido recopilar de distintas partes del Perú através de salidas de campo, las cuales las iré actualizando periódicamente.
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El resultado: No podía ser mejor, aún queda mucho por hacer… Mapa geológico del Perú (Escala 1/4000000), 501 mapas a escala 1/100000. INGEMMET.
Afloramientos geológicos
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Formación Talara / Miembro Helico (Eoceno medio / Terciario): Areniscas limosas color beige con laminación horizontal intercalado con yeso primario y lutitas (claystone) gris oscuras, las areniscas contienen conglomerados redondeados que tienen un diámetro mayor a 1 metro. Punta Lobos.
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Grupo Goyllarisquizga (Cretáceo inferior): Areniscas cuarzosas de color claro y rojizas.
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Formación Topará (Cuaternario): Arenas grises con laminación hori zontal y cruzada (acanalada y tangencial), limoarcillas en bancos gruesos y facies de debris flow en la base. Chincha.
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Grupo Mitu (Pérmico superior – superior – Triásico Triásico inferior) y Grupo Pucará (Triásico superior – superior – Jurásico Jurásico inferior): Contacto geológico de izquierda a derecha. Poblado de Goyllarisquizga – Goyllarisquizga – Cerro Cerro de Pasco.
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Formación Pamplona (Barremiano-Cretáceo inferior): inferior ): Intercalación de calizas en estratos bien definidos de 15 centímetros, margas y lutitas rojizas. Panamericana sur, Pamplona – Pamplona – Lima. Lima.
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Formación Salto del Frayle y Miembro La Virgen (Valanginiano – (Valanginiano – Hauteriviano Hauteriviano / Cretáceo inferior): Contacto geológico desde la base hacia el tope. Salto del
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Formación Atocongo (Albiano – (Albiano – Aptiano Aptiano / Cretáceo superior): Calizas grisáceas en bancos gruesos, presentan rastros de disolución cárstica. Cerro manzano,
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Formación Chonta (Cenomaniano – (Cenomaniano – Santoniano Santoniano / Cretáceo Superior): Lodolitas oscuras características y calizas de origen marino. Carretera a Río Negro – Negro –
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Batolito de la Cordillera Blanca (Mioceno / Terciario): Rocas ígneas intrus ivas tales como tonalitas y granitos hacia el fondo de la fotografía. Ruinas de
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Formación Pariatambo (Albiano / Cretáceo medio a superior ) : Calizas grises a oscuras que poseen estratificación oscilatoria con estratos homogéneos de aproximadamente 20 cm intercalados con niveles finos. Río Chamaya – Chamaya – Cuadrángulo de Jaén.
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