Reconocimiento geoquímico para determinar áreas potenciales de mineralización en la cuenca del río Pijilí, parroquia El Carmen de Pijilí, cantón Camilo Ponce Enríquez.
Fecha
2022-03
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Se realizó un reconocimiento geoquímico para determinar zonas potenciales de mineralización en la cuenca del rio Pijilí, cantón Camilo Ponce Enríquez, Ecuador. En la zona afloran rocas de la Unidad Pallatanga y Granodioritas con contenidos de mineralización tipo pórfido, vetas y stockworks epimesotermales; además
formaciones de origen sedimentario sin interés mineral. Se llevaron a cabo 15 muestreos de sedimentos fluviales, 6 de aguas y 6 de concentrados pesados. Las muestras de sedimentos fueron analizadas mediante
ICP-MS para 53 elementos, de los cuales 6 presentaron resultados anómalos con valores máximos de oro hasta 1.15 ppm, plata hasta 14.30 ppm, cobre con 1330 ppm, plomo con 1920 ppm, zinc con 2070 ppm, molibdeno con 1.97 ppm. Los resultados de hidrogeoquímica mostraron valores anómalos de los siguientes
elementos en comparación con sus contenidos en aguas superficiales: plata hasta 0.0008 ppm, arsénico con 0.18 ppm, cadmio con 0.0017 ppm, plomo con 0.0045 ppm, antimonio con 0.025 ppm. En una de las muestras de concentrados pesados se detectó una partícula de oro con propiedades como color y raya amarillo-dorado, dureza 2.5 en escala de Mohs, es una partícula sub-redondeada, opaco y lustre metálico. Se identificaron 4 zonas potenciales para mineralización de tipo pórfido de cobre y de metales base ubicadas en las zonas centro-sur, noreste, noroeste y sureste de la cuenca.
A geochemical reconnaissance was carried out to determine potential mineralization zones in the Pijilí river basin, Camilo Ponce Enríquez canton, Ecuador. Rocks from the Pallatanga Unit and Granodiorites outcrop in the area with porphyrytype mineralization contents, veins and epimesothermal stockworks; also formations of sedimentary origin without mineral interest. 15 samples of fluvial sediments, 6 of water and 6 of heavy concentrates were carried out. The sediment samples were analyzed by ICP-MS for 53 elements, of which 6 presented anomalous results with maximum values of gold up to 1.15 ppm, silver up to 14.30 ppm, copper with 1330 ppm, lead with 1920 ppm, zinc with 2070 ppm, molybdenum with 1.97 ppm. The hydrogeochemical results showed abnormal values of the following elements compared to their contents in surface water: silver up to 0.0008 ppm, arsenic with 0.18 ppm, cadmium with 0.0017 ppm, lead with 0.0045 ppm, antimony with 0.025 ppm. In one of the heavy concentrate samples, a gold particle was detected with properties such as golden-yellow color and stripe, hardness 2.5 on the Mohs scale, it is a sub-rounded particle, opaque and metallic luster. Four potential zones for porphyry-type copper and base metal mineralization were identified, located in the central-south, northeast, northwest and southeast areas of the basin.
A geochemical reconnaissance was carried out to determine potential mineralization zones in the Pijilí river basin, Camilo Ponce Enríquez canton, Ecuador. Rocks from the Pallatanga Unit and Granodiorites outcrop in the area with porphyrytype mineralization contents, veins and epimesothermal stockworks; also formations of sedimentary origin without mineral interest. 15 samples of fluvial sediments, 6 of water and 6 of heavy concentrates were carried out. The sediment samples were analyzed by ICP-MS for 53 elements, of which 6 presented anomalous results with maximum values of gold up to 1.15 ppm, silver up to 14.30 ppm, copper with 1330 ppm, lead with 1920 ppm, zinc with 2070 ppm, molybdenum with 1.97 ppm. The hydrogeochemical results showed abnormal values of the following elements compared to their contents in surface water: silver up to 0.0008 ppm, arsenic with 0.18 ppm, cadmium with 0.0017 ppm, lead with 0.0045 ppm, antimony with 0.025 ppm. In one of the heavy concentrate samples, a gold particle was detected with properties such as golden-yellow color and stripe, hardness 2.5 on the Mohs scale, it is a sub-rounded particle, opaque and metallic luster. Four potential zones for porphyry-type copper and base metal mineralization were identified, located in the central-south, northeast, northwest and southeast areas of the basin.
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RÍO PIJILÍ, RECONOCIMIENTO GEOQUÍMICO, STOCKWORKS, SEDIMENTOS FLUVIALES, MINERALIZACIÓN