Evaluación del modelo genético de la mineralización de Cu-Au de los sectores de El Rincón- Pucalán del distrito de Puchuncaví, región de Valparaíso, Chile
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2021
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es
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Universidad Andrés Bello
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Licencia CC
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Este trabajo presenta una descripción de la geología en detalle y las diversas ocurrencias minerales asociadas a los laboreos mineros y pirquineos presentes en el sector de Puchuncaví, específicamente entre los 32°43’ - 32°45’ S, correspondiente a los cerros ubicados entre las localidades de La Canela, El Rincón y Pucalán. En esta zona afloran unidades mesozoicas correspondientes a la Formación Ajial (Thomas, 1958; Piracés & Maksaev, 1976; Rivano et al., 1993) de edad Jurásica Media – Superior, formación que se encuentra afectada por procesos de metamorfismo dinámico y regional (carga).
El presente trabajo aporta con 1) una comparación y correcciones asociadas a afloramientos de andesitas y depósitos coluviales observados que difieren con el mapeo realizado por Rivano et al., (1993), donde identifica en este sector mayores potencias para los depósitos no consolidados que son clasificados como depósitos fluviales y coluviales; 2) definir los tipos de metamorfismo que afectan a la zona de estudio, asociados a metamorfismo regional (carga) y metamorfismo dinámico por fallamiento, lo que difiere del trabajo de Rivano et al., (1993), donde indica que las rocas de la Formación Ajial en el área de estudio se encuentran afectadas por metamorfismo dinámico y termal, sin identificar de forma clara la génesis para el metamorfismo dinámico que afecta la zona y que puede estar asociado a fallamiento o una intrusión de un cuerpo plutónico; 3) identificar y caracterizar los sectores mineralizados del área de estudio asociados a laboreos en estado de abandono o en explotación y así definir su control junto con potencial minero, donde las principalmente la mineralización corresponde a sulfuros hipógenos, con la mina Raíz del Cobre identificada como el laboreo con mayor presencia de Cu el cual se asocia a un sistema tipo manto silicificado en rocas foliadas; la mineralización de oxidados de cobre y hierro se encuentran en todos los laboreos y son producto de proceso supérgenos; 4) debido al tipo de mineralización existente caracterizada por la baja cantidad de pirita es que existe un escaso enriquecimiento secundario, lo que indica un potencial económico limitado para el área de estudio donde la mineralización está asociada a vetas – fallas – fracturas y se descarta la posibilidad de la existencia de un depósito IOCG del tipo estratoligado.
This document presents a detailed description of the geology and diverse mineral occurrences associated with mining activity located in Puchuncavi area, specifically between 32°43’ – 32°45’S, corresponding to the hills located between the towns of La Canela, El Rincon and Pucalan. In this zone emerge Mesozoic units corresponding to the Ajial Formation (Thomas, 1958; Piraces & Maksaev, 1976; Rivano et al., 1993) of the Jurassic Middle – Upper age, that is affected by processes of dynamic and regional metamorphism (load metamorphism). The present document provides 1) comparisons and corrections associated with andesite outcrops and colluvial deposits observed that differ with the mapping carried out by Rivano et al., 1993, where it identifies in this sector greater potential for the unconsolidated deposits that are classified as fluvial and colluvial deposits; 2) defines the types of metamorphism that affect the studied area, associated with regional metamorphism (load metamorphism) and dynamic metamorphism due to faulting, which differs from the work of Rivano et al., 1993, where it indicates that rocks of the Ajial Formation in the studied zone are affected by dynamic and thermal metamorphism, without clearly identifying the genesis for the dynamic metamorphism that affects the area and may be associated with faulting or an intrusion of a plutonic body; 3) identifies and characterize the mineralized sectors of the study area associated with tillage in a state of abandonment or in exploitation and thus define their control together with mining potential, where the mineralization mainly corresponds to hypogenic sulphides, with ‘‘Raiz del Cobre’’ mine identified with a higher presence of Cu, which is associated with a silicified mantle type system in foliated rocks; the mineralization of oxidized copper and iron are found in all the works and are the product of a supergene process; 4) due to the type of existing mineralization characterized by the low amount of pyrite, there is a little secondary enrichment, which indicates a limited economic potential for the study area where the mineralization is associated with veins – faults – fractures, the possibility of the existence of an IOCG deposits of the stratified type is discarded.
This document presents a detailed description of the geology and diverse mineral occurrences associated with mining activity located in Puchuncavi area, specifically between 32°43’ – 32°45’S, corresponding to the hills located between the towns of La Canela, El Rincon and Pucalan. In this zone emerge Mesozoic units corresponding to the Ajial Formation (Thomas, 1958; Piraces & Maksaev, 1976; Rivano et al., 1993) of the Jurassic Middle – Upper age, that is affected by processes of dynamic and regional metamorphism (load metamorphism). The present document provides 1) comparisons and corrections associated with andesite outcrops and colluvial deposits observed that differ with the mapping carried out by Rivano et al., 1993, where it identifies in this sector greater potential for the unconsolidated deposits that are classified as fluvial and colluvial deposits; 2) defines the types of metamorphism that affect the studied area, associated with regional metamorphism (load metamorphism) and dynamic metamorphism due to faulting, which differs from the work of Rivano et al., 1993, where it indicates that rocks of the Ajial Formation in the studied zone are affected by dynamic and thermal metamorphism, without clearly identifying the genesis for the dynamic metamorphism that affects the area and may be associated with faulting or an intrusion of a plutonic body; 3) identifies and characterize the mineralized sectors of the study area associated with tillage in a state of abandonment or in exploitation and thus define their control together with mining potential, where the mineralization mainly corresponds to hypogenic sulphides, with ‘‘Raiz del Cobre’’ mine identified with a higher presence of Cu, which is associated with a silicified mantle type system in foliated rocks; the mineralization of oxidized copper and iron are found in all the works and are the product of a supergene process; 4) due to the type of existing mineralization characterized by the low amount of pyrite, there is a little secondary enrichment, which indicates a limited economic potential for the study area where the mineralization is associated with veins – faults – fractures, the possibility of the existence of an IOCG deposits of the stratified type is discarded.
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Tesis (Geólogo)
Palabras clave
Rocas estratificadas, Geología Estructural, Mineralización y alteración, Geomorfología, Chile