Caracterización geológica geoquímica en base a datos obtenidos en testigos de perforación, Depósito El Domo
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El depósito “El Domo” se encuentra ubicado en las estribaciones de la cordillera occidental de
Ecuador, a 13 km del cantón Las Naves, provincia de Bolívar. Está formado por rocas
correspondientes al arco de islas volcánico de la Fm Macuchi edad Paleoceno-Eoceno, se
caracteriza por ser un depósito Sulfuro Masivo Vulcanogénico tipo Kuroko. La presente investigación
se orientó en el estudio de datos obtenido en 30 sondajes para realizar una caracterización
Geológica - Geoquímica que comprenda la relación entre las litologías, mineralización, resultados
de laboratorio para 12 elementos; los principales de mena metálica Au, Ag, Cu, Pb, Zn y los
elementos trazadores As, Ba, Cd, Hg, Mn, Sb, Sr; para el entendimiento geológico del yacimiento
se elaboró 10 secciones Este-Oeste permitió crear un modelo geológico en 3 dimensiones de cómo
están distribuidos litoestratigráficamente desde el inicio del sistema; a los elementos químicos se
les sometió a tratamiento geoestadístico para sacar los rangos de fondo, umbral, subanomalía,
anomalías y crear perfiles Geoquímicos, la correlación de los elementos ayudó a identificar los
eventos de pulsación hidrotermal al formarse el Sulfuro Masivo; el depósito se originó durante un
acontecimiento tectónico significativo provocado por volcanismo submarino que comenzó con la
erupción de un complejo magmático ácido (Unidad ácida Inferior) posteriormente este primer evento
sirvió como zona de alimentación para el paso y depositación del Sulfuro Masivo seguido después
de un tercer evento de sedimentación Tobácea (Unidad Tobácea Superior).
The deposit “El Domo” is located in the foothills of the western rift of Ecuador, 13 km to Las Naves, province of Ecuador Bolívar. It is formed by rocks corresponding to the arc of volcanic islands of the Fm. Macuchi Paleocene-Eocene age, it is characterized for being a deposit Volcanogenic Massive Sulphide type Kuroko. The present investigation was oriented in the study of data obtained in 30 drillholes to perform a Geological – Geochemical characterization that includes the relationship betw een lithologies, mineralization, laboratory results for 12 elements; the main ones of metal ore Au, Ag, Cu, Pb, Zn and the tracer elements As, Ba, Cd, Hg, Mn, Sb, Sr; for the geological understanding of the site, 10 East-West sections were elaborated to create a 3D geological model of how they are distributed lithostratigraphically from the beginning of the system; to the chemical elements were subjected to geostatistical treatment to obtain the background, threshold, subanomaly, anomalies and geochemical profiles, the correlation of the elements helped to identify the events of hydrothermal pulsation when Massive Sulphide was formed; the deposit originated during a significant tectonic event caused by submarine volcanism that began with the eruption of an acidic magmatic complex (Lower Acid Unit) later this first event served as a feeding zone for the passage and deposition of the Massive Sulphide followed by a third tuff sedimentation event (Upper Tuff Unit).
The deposit “El Domo” is located in the foothills of the western rift of Ecuador, 13 km to Las Naves, province of Ecuador Bolívar. It is formed by rocks corresponding to the arc of volcanic islands of the Fm. Macuchi Paleocene-Eocene age, it is characterized for being a deposit Volcanogenic Massive Sulphide type Kuroko. The present investigation was oriented in the study of data obtained in 30 drillholes to perform a Geological – Geochemical characterization that includes the relationship betw een lithologies, mineralization, laboratory results for 12 elements; the main ones of metal ore Au, Ag, Cu, Pb, Zn and the tracer elements As, Ba, Cd, Hg, Mn, Sb, Sr; for the geological understanding of the site, 10 East-West sections were elaborated to create a 3D geological model of how they are distributed lithostratigraphically from the beginning of the system; to the chemical elements were subjected to geostatistical treatment to obtain the background, threshold, subanomaly, anomalies and geochemical profiles, the correlation of the elements helped to identify the events of hydrothermal pulsation when Massive Sulphide was formed; the deposit originated during a significant tectonic event caused by submarine volcanism that began with the eruption of an acidic magmatic complex (Lower Acid Unit) later this first event served as a feeding zone for the passage and deposition of the Massive Sulphide followed by a third tuff sedimentation event (Upper Tuff Unit).
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Palabras clave
MODELO GEOLOGICO, SECCIONES GEOLOGICAS, CORRELACION DE ELEMENTOS