Bioestratigrafía y ambiente deposicional de la Formación Progreso (Mioceno Medio a Tardío) en la Reserva “Proyecto Sacha”, Cantón Santa Elena
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2024
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Universidad de Guayaquil. Facultad de Ciencias Naturales
Resumen
La Formación Progreso forma parte de cuenca Progreso, aflora en terrenos de la Reserva “Proyecto Sacha”, que por medio de estudios bioestratigráficos y petrográficos permitieron determinar su edad, ambiente deposicional y procedencia tectónica.
Se analizaron 26 muestras de roca tomadas en los 11 afloramientos del área de estudio, en los cuales 5 resultaron estériles y 5 secciones delgadas, que permitieron determinar la litología del área como areniscas calcáreas y calizas bioclásticas, desarrollados en un paleoambiente sedimentario que abarca desde la plataforma interna hasta externa. Este ambiente esta caracterizado por foraminíferos bentónicos calcáreos y parte de llanura abisal.
La edad relativa se sitúa entre el Mioceno temprano a medio (Zona N4-15), confirmada por la presencia de foraminíferos planctónicos como Globorotalia siakensis LeRoy. Su procedencia tectónica sugiere un origen de interior cratónico con aporte de orógeno reciclado y orógeno de arco, con tendencia hacia un orógeno de colisión. Este estudio fue complementado con la elaboración de un mapa litoestructural de la Reserva a escala 1:25:000
The Progreso Formation is part of the Progreso basin, outcrops in the "Sacha Project" Reserve, which through biostratigraphic and petrographic studies allowed us to determine its age, depositional environment and tectonic origin. Twenty-six rock samples taken in the 11 outcrops of the study area were analyzed, 5 of which were sterile and 5 thin sections, which allowed determining the lithology of the area as calcareous sandstones and bioclastic limestones, developed in a sedimentary paleoenvironment ranging from the inner to outer platform. This environment is characterized by calcareous benthic foraminifera and part of the abyssal plain. The relative age is early to middle Miocene (Zone N4-15), confirmed by the presence of planktonic foraminifera such as Globorotalia siakensis LeRoy. Its tectonic provenance suggests a cratonic interior origin with input from recycled orogen and arc orogen, with a tendency towards a collision orogen. This study was complemented with the elaboration of a lithostructural map of the Reserve at a scale of 1:25:000.
The Progreso Formation is part of the Progreso basin, outcrops in the "Sacha Project" Reserve, which through biostratigraphic and petrographic studies allowed us to determine its age, depositional environment and tectonic origin. Twenty-six rock samples taken in the 11 outcrops of the study area were analyzed, 5 of which were sterile and 5 thin sections, which allowed determining the lithology of the area as calcareous sandstones and bioclastic limestones, developed in a sedimentary paleoenvironment ranging from the inner to outer platform. This environment is characterized by calcareous benthic foraminifera and part of the abyssal plain. The relative age is early to middle Miocene (Zone N4-15), confirmed by the presence of planktonic foraminifera such as Globorotalia siakensis LeRoy. Its tectonic provenance suggests a cratonic interior origin with input from recycled orogen and arc orogen, with a tendency towards a collision orogen. This study was complemented with the elaboration of a lithostructural map of the Reserve at a scale of 1:25:000.
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FORMACIÓN PROGRESO, BIOESTRATIGRAFÍA, PROYECTO SACHA, AMBIENTE DEPOSICIONAL, PETROTECTÓNICA