Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos

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Fecha de publicación:: 2026

Institución:: Universidad de Caldas

Repositorio:: Repositorio Institucional U. Caldas

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dc.title.none.fl_str_mv	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
title	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
spellingShingle	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos 550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología 1. Ciencias Naturales::1E. Ciencias de la tierra y medioambientales::1E06. Geología Corrientes de fondo Flujos gravitacionales Sedimentación hemipelágica Oxigenación del fondo Productividad del fondo Icnofósiles Morfogrupos bentónicos Geología Sedimentología Paleontología
title_short	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
title_full	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
title_fullStr	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
title_full_unstemmed	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
title_sort	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos
dc.contributor.none.fl_str_mv	Garzon Oyola, Darwin Mauricio GALLEGO BAÑOL, NELSON FABIAN Trejos-Tamayo, Raúl GIEV-(CUMANDAY) Grupo de Investigación en Estratigrafía y Vulcanología (Categoría A1) Lemus-Restrepo, Alexander
dc.subject.none.fl_str_mv	550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología 1. Ciencias Naturales::1E. Ciencias de la tierra y medioambientales::1E06. Geología Corrientes de fondo Flujos gravitacionales Sedimentación hemipelágica Oxigenación del fondo Productividad del fondo Icnofósiles Morfogrupos bentónicos Geología Sedimentología Paleontología
topic	550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología 1. Ciencias Naturales::1E. Ciencias de la tierra y medioambientales::1E06. Geología Corrientes de fondo Flujos gravitacionales Sedimentación hemipelágica Oxigenación del fondo Productividad del fondo Icnofósiles Morfogrupos bentónicos Geología Sedimentología Paleontología
description	Figuras, tablas
publishDate	2026
dc.date.none.fl_str_mv	2026-05-25T20:52:11Z 2026-05-25T20:52:11Z 2026-05-25
dc.type.none.fl_str_mv	Trabajo de grado - Pregrado http://purl.org/coar/resource_type/c_7a1f Text info:eu-repo/semantics/bachelorThesis
dc.identifier.none.fl_str_mv	https://repositorio.ucaldas.edu.co/handle/ucaldas/27059 Universidad de Caldas Repositorio Institucional Universidad de Caldas repositorio.ucaldas.edu.co
url	https://repositorio.ucaldas.edu.co/handle/ucaldas/27059
identifier_str_mv	Universidad de Caldas Repositorio Institucional Universidad de Caldas repositorio.ucaldas.edu.co
dc.language.none.fl_str_mv	spa
language	spa
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spelling	Condiciones paleoambientales en el Tortoniano del pozo ANH-Tumaco-1-ST-P (cuenca Tumaco, Pacífico colombiano): inferencias a partir de sedimentología y foraminíferos bentónicos550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología1. Ciencias Naturales::1E. Ciencias de la tierra y medioambientales::1E06. GeologíaCorrientes de fondoFlujos gravitacionalesSedimentación hemipelágicaOxigenación del fondoProductividad del fondoIcnofósilesMorfogrupos bentónicosGeologíaSedimentologíaPaleontologíaFiguras, tablasComprender la evolución geológica del noroeste de Suramérica durante el Mioceno Tardío es de gran importancia para dilucidar el impacto de la tectónica andina y la reorganización del Pacífico Ecuatorial Oriental en los ecosistemas tropicales. Este estudio presenta un enfoque multiproxy para el análisis paleoambiental de la sucesión del Tortoniano registrada por el Pozo ANH-Tumaco-1-ST-P, perforado en el sector suroccidental de la cuenca Tumaco (Pacífico colombiano). Utilizando datos sedimentológicos y la distribución de las asociaciones de foraminíferos bentónicos a través de análisis cuantitativos de abundancia, composición, diversidad, preferencias de microhábitat, estimaciones de oxigenación y estadística multivariable, se propone un ambiente depositacional y las condiciones predominantes del fondo marino. Los resultados revelan el desarrollo de un sistema marino profundo de naturaleza mixta/híbrida en el talud continental, redefiniendo modelos previos que sugerían ambientes de plataforma o deltaicos. El registro sedimentario se caracteriza por la alternancia reiterada de depósitos interpretados como contornitas de grano fino, turbiditas de grano medio a fino, depósitos híbridos y hemipelagitas organizadas, sugiriendo un paleoambiente controlado por episodios puntuales de transferencia de sedimento por flujos gravitacionales, la actividad persistente y energéticamente variable de corrientes de fondo/contorno que retrabajaron y redistribuyeron parte del material fino, y la sedimentación hemipelágica o producción orgánica/biogénica in situ en las fases de menor energía. El registro icnológico, conformado por 17 icnogéneros, representa estrategias de alimentación, pastoreo y vivienda. Paralelamente, las asociaciones de foraminíferos bentónicos confirman una paleoprofundidad en el espectro batial con el desarrollo de comunidades con una diversidad de baja a moderada, dominadas por taxones hialinos con preferencias infaunales dominantes e incursiones subordinadas de formas epifaunales. Los patrones micropaleontológicos e icnológicos indican que las variaciones cíclicas en las condiciones redox y la energía hidrodinámica modularon la habitabilidad del fondo marino y del medio intersticial. Los medios de transporte habrían inducido la inyección relativa de oxígeno y la distribución de materia orgánica particulada, generando escenarios “favorables” o “desfavorables” para la coexistencia de taxones oxifílicos e indicadores de estrés ambiental.Understanding the geological evolution of northwestern South America during the Late Miocene is of significant importance for elucidating the impact of Andean tectonics and the reorganization of the Eastern Equatorial Pacific (EEP) on tropical ecosystems. This study presents a multiproxy approach for the paleoenvironmental analysis of the Tortonian succession recorded by the ANH-Tumaco-1-ST-P well, drilled in the southwestern sector of the Tumaco Basin (Colombian Pacific). By integrating sedimentological data and the distribution of benthic foraminifera associations through quantitative analyses of abundance, composition, diversity, microhabitat preferences, oxygenation estimates, and multivariate statistics, a depositional environment and the predominant seafloor conditions are proposed. The results reveal the development of a deep-marine mixed/hybrid system on the continental slope, redefining previous models that suggested shelf or deltaic environments. The sedimentary record is characterized by a repeated alternation of deposits interpreted as fine-grained contourites, medium-to-fine-grained turbidites, hybrid deposits, and organized hemipelagites. This suggests a paleoenvironment controlled by episodic sediment transfer by gravity flows, the persistent and energetically variable activity of bottom/contour currents that reworked and redistributed fine material, and hemipelagic sedimentation or in situ biogenic production during low-energy phases. The ichnological record, consisting of 17 ichnogenera, represents feeding, grazing, and dwelling strategies. Simultaneously, benthic foraminifera associations confirm a bathyal paleodepth, with the development of communities of low-to-moderate diversity dominated by hyaline taxa with dominant infaunal preferences and subordinate incursions of epifaunal forms. Micropaleontological and ichnological patterns indicate that cyclic variations in redox conditions and hydrodynamic energy modulated the habitability of the seafloor and the interstitial environment. Transport mechanisms likely induced relative oxygen injection and the distribution of particulate organic matter, creating "favorable" or "unfavorable" scenarios for the coexistence of oxyphilic taxa and environmental stress indicators.Introducción -- Objetivos -- Objetivo general -- Objetivos específicos -- Marco geológico -- Marco oceanográfico -- Oceanografía del Pacífico Ecuatorial Oriental -- Paleoceanografía del Pacífico Ecuatorial Oriental durante el Mioceno -- Materiales y métodos -- Sedimentología -- Muestreo y procesamiento micropaleontológico -- Análisis de foraminíferos bentónicos -- Análisis univariable -- Análisis multivariable -- Resultados -- Modelo de edad -- Sedimentología -- Descripción de litofacies -- Asociación de facies -- Parámetros paleoecológicos según foraminíferos bentónicos -- Abundancia y preservación -- Estructura de la pared y morfogrupos funcionales -- Índices paleoecológicos -- Análisis clúster -- Discusión -- Condiciones paleoambientales a partir de sedimentología -- Condiciones paleoambientales a partir de foraminíferos bentónicos -- Paleobatimetría -- Características de las aguas de fondo -- Implicaciones generales en el sistema depositacional -- Conclusiones -- Referencias -- AnexosPregradoGeólogo(a)Universidad de CaldasFacultad de Ciencias Exactas y NaturalesManizales, CaldasGeologíaGarzon Oyola, Darwin MauricioGALLEGO BAÑOL, NELSON FABIANTrejos-Tamayo, RaúlGIEV-(CUMANDAY) Grupo de Investigación en Estratigrafía y Vulcanología (Categoría A1)Lemus-Restrepo, AlexanderDuran Quintero, Juan Esteban2026-05-25T20:52:11Z2026-05-25T20:52:11Z2026-05-25Trabajo de grado - Pregradohttp://purl.org/coar/resource_type/c_7a1fTextinfo:eu-repo/semantics/bachelorThesis101 páginasapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttps://repositorio.ucaldas.edu.co/handle/ucaldas/27059Universidad de CaldasRepositorio Institucional Universidad de Caldasrepositorio.ucaldas.edu.cospaAgencia Nacional de Hidrocarburos, & Antek. 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