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2105248121101000.Pdf ELABORACIÓN DE LA CARTOGRAFÍA GEOLÓGICA DE UN CONJUNTO DE PLANCHAS A ESCALA 1:100.000 UBICADAS EN CUATRO BLOQUES DEL TERRITORIO NACIONAL IDENTIFICADOS POR EL SERVICIO GEOLÓGICO COLOMBIANO GRUPO 2: ZONAS SUR A Y SUR B GEOLOGÍA DE LA PLANCHA 285 SAN MARTIN Escala 1: 100.000 Contrato Nº 512 - 2013 MEMORIA EXPLICATIVA Bogotá, D.C., Septiembre de 2015 ELABORACIÓN DE LA CARTOGRAFÍA GEOLÓGICA DE UN CONJUNTO DE PLANCHAS A ESCALA 1:100.000 UBICADAS EN CUATRO BLOQUES DEL TERRITORIO NACIONAL IDENTIFICADOS POR EL SERVICIO GEOLÓGICO COLOMBIANO GRUPO 2: ZONAS SUR A Y SUR B GEOLOGÍA DE LA PLANCHA 326 VISTA HERMOSA Escala 1: 100.000 Contrato Nº 512 - 2013 MEMORIA EXPLICATIVA Elaborado por: UT G&H Director Proyecto Geólogo Fernando Buchely Gerente Administrativo Geólogo PhD. Luís Gómez Asesor Estratigrafía Geólogo PhD. Mario Moreno-Sánchez Asesores Geología Estructural Geólogo PhD. Luís Gómez y Geólogo MSc. Gustavo Hincapié Coordinador Técnico Geólogo José Buitrago Fotogeólogo y Geomorfólogo Geólogo MSc. Alberto Cristancho Coordinador de Campo Geólogo MSc. Juan Manuel Aranzazu Hernández Geólogos de Campo Alejandro Patiño Carlos Quiñonez Mario Moreno José Buitrago Coordinador Social Antropólogo Mauricio Rojas Dirección SIG Talía Berg Coordinadores SIG Lucrecia Nota David Culebra Coordinación de Edición Carolina López Oscar Arias Bogotá, D.C., Septiembre de 2015 Servicio Geológico Colombiano CONTENIDO Pág. RESUMEN 18 ABSTRACT ................................................................................................................... 19 1. INTRODUCCIÓN ........................................................................................... 20 2. GENERALIDADES .......................................................................................... 21 2.1 LOCALIZACIÓN E INFRAESTRUCTURA ........................................................... 21 2.2 TRABAJOS ANTERIORES ............................................................................... 23 2.3 METODO DE TRABAJO ................................................................................. 25 2.3.1 Compilación, análisis evaluación de la información geocientífica existente .. 26 2.3.2 Interpretación Fotogeológica ....................................................................... 26 2.3.3 Labores de campo (cartografía geológica) .................................................... 28 2.3.4 Elaboración de la libreta digital .................................................................... 29 2.3.5 Análisis de laboratorio ................................................................................. 29 2.3.6 Elaboración del mapa geológico a escala 1:100.000 ...................................... 30 2.3.7 Elaboración de la memoria explicativa ......................................................... 30 2.4 PERSONAL PARTICIPANTE ............................................................................ 30 2.5 AGRADECIMIENTOS ..................................................................................... 31 3. GEOMORFOLOGÍA ....................................................................................... 32 3.1 AMBIENTE ESTRUCTURAL ............................................................................ 34 3.1.1 Escarpe de línea de falla (Slfe): ..................................................................... 35 3.1.2 Espolones (Ses): ........................................................................................... 35 3.1.3 Faceta triangular (Sft): ................................................................................. 35 3.1.4 Ladera de contrapendiente (Slcp):................................................................ 35 3.1.5 Ladera escalonada (Sles): ............................................................................. 35 3.1.6 Ladera estructural (Sle): ............................................................................... 36 3.1.7 Sierra anticlinal (Ssan): ................................................................................ 36 3.2 AMBIENTE DENUDACIONAL ......................................................................... 36 3.2.1 Ladera ondulada (Dlo): ................................................................................ 36 3.2.2 Sierra denudada (Dsd): ................................................................................ 37 3.2.3 Mesa de Abanico (Dmab): ............................................................................ 37 3.3 AMBIENTE FLUVIAL ...................................................................................... 37 3.3.1 Abanico aluvial actual (Faaac): ..................................................................... 37 3.3.2 Abanico aluvial antiguo (Faaa): .................................................................... 38 Geología de la Plancha 285 San Martin – Escala 1: 100000 – Memoria Explicativa 2 Servicio Geológico Colombiano 3.3.3 Abanico aluvial sub‐reciente (Faas): ............................................................. 39 3.3.4 Escarpe de abanico (Fea):............................................................................. 40 3.3.5 Cauce aluvial (Fca): ...................................................................................... 40 3.3.6 Terraza de acumulación (Fta): ...................................................................... 41 3.3.7 Terraza de acumulación antigua (Ftan). ........................................................ 41 3.3.8 Terraza de acumulación sub-reciente (Ftas). ................................................ 41 4. ESTRATIGRAFÍA ........................................................................................... 42 4.1 NEOPROTEROZOICO-PALEOZOICO TEMPRANO ............................................ 42 4.1.1 Filitas y Cuarcitas de Guayabetal (NPfg) ....................................................... 42 4.1.1.1 Descripción Geológica .......................................................................................... 44 4.1.1.2 Descripción microscópica .................................................................................... 44 4.1.1.3 Contactos y Correlación ....................................................................................... 45 4.1.1.4 Edad y Ambiente .................................................................................................. 45 4.1.2 Metagabro del Ariari (NPmga) ..................................................................... 45 4.1.2.1 Descripción Geológica .......................................................................................... 45 4.1.2.2 Descripción Microscópica .................................................................................... 46 4.1.2.3 Contactos y Correlación ....................................................................................... 47 4.1.2.4 Edad y Ambiente .................................................................................................. 48 4.2 PALEOZOICO ................................................................................................ 49 4.2.1 Formación Ariari (ɛca) .................................................................................. 49 4.2.1.1 Descripción Geológica .......................................................................................... 51 4.2.1.2 Descripción microscópica .................................................................................... 56 4.2.1.3 Contactos y Correlación ....................................................................................... 56 4.2.1.4 Edad y ambiente .................................................................................................. 57 4.2.2 Formación Guape y Duda no diferenciadas (ɛgu-du) ..................................... 58 4.2.2.1 Descripción Geológica .......................................................................................... 60 4.2.2.2 Descripción microscópica .................................................................................... 65 4.2.2.3 Contactos y Correlación ....................................................................................... 67 4.2.2.4 Edad, Ambiente y Procedencia ............................................................................ 68 4.2.3 Lutitas de Pipiral (D2p) ................................................................................ 71 4.2.3.1 Descripción Geológica .......................................................................................... 71 4.2.3.2 Descripción microscópica .................................................................................... 74 4.2.3.3 Contactos y correlación ....................................................................................... 75 4.2.3.4 Edad, Ambiente de Depósito y Procedencia ....................................................... 75 4.3 CRETÁCEO ................................................................................................... 76 4.3.1 Formación Une (K1b6u) ............................................................................... 76 4.3.1.1 Descripción Geológica .......................................................................................... 76 4.3.1.2 Descripción microscópica .................................................................................... 77 4.3.1.3 Contactos y Correlación ....................................................................................... 78 4.3.1.4 Edad y Ambiente .................................................................................................. 78 4.3.2
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