INVESTIGADORES
PETRINOVIC Ivan Alejandro
artículos
Título:
Erupciones freáticas sintectónicas en el campo geotérmico de Tocomar, Salta, Argentina.
Autor/es:
IVAN ALEJANDRO PETRINOVIC; ARNOSIO, J.; ALVARADO, G.; GUZMÁN, S.
Revista:
Revista de la Asociación Geológica Argentina
Referencias:
Año: 2005 vol. 60 p. 112 - 141
ISSN:
0004-4822
Resumen:
ABSTRACT. Syntectonic phreatic eruptions in the Tocomar geothermal field, Salta. Pleistocene volcaniclastic breccias are described
closely associated to the Tocomar geothermal field (24°10S 66°34O). The absence of juvenile fragments (pumice and accessory
lithics) attests an origin from an eruption developed by 1) an hydrothermal system violently depressurised or 2) by the interaction
of hydrothermal fluids with overheated host rock (phreatic to hydro-geothermal explosion). Fragments produced by these phreatic
explosions were transported by base surges. Planar bed structures, sand-wave structures and bomb sags are the most common
depositional structures. Some pits perhaps related with this eruption were recognized, roughly prolate in shape 50 to 100 m in
diameter. The phreatic eruptions were triggered by horizontal dilation associated to a tectonic transference between main Ntrending
thrusts and the Calama-Olacapato-El Toro fault zone. The volcaniclastic deposits shows syn-depositional faulting. This
interpretation is an additional evidence of the tectonic activity of the Calama-Olacapato-El Toro fault in the Pleistocene,
reinforcing the geothermal potential of the Tocomar area.
closely associated to the Tocomar geothermal field (24°10S 66°34O). The absence of juvenile fragments (pumice and accessory
lithics) attests an origin from an eruption developed by 1) an hydrothermal system violently depressurised or 2) by the interaction
of hydrothermal fluids with overheated host rock (phreatic to hydro-geothermal explosion). Fragments produced by these phreatic
explosions were transported by base surges. Planar bed structures, sand-wave structures and bomb sags are the most common
depositional structures. Some pits perhaps related with this eruption were recognized, roughly prolate in shape 50 to 100 m in
diameter. The phreatic eruptions were triggered by horizontal dilation associated to a tectonic transference between main Ntrending
thrusts and the Calama-Olacapato-El Toro fault zone. The volcaniclastic deposits shows syn-depositional faulting. This
interpretation is an additional evidence of the tectonic activity of the Calama-Olacapato-El Toro fault in the Pleistocene,
reinforcing the geothermal potential of the Tocomar area.
Syntectonic phreatic eruptions in the Tocomar geothermal field, Salta. Pleistocene volcaniclastic breccias are described
closely associated to the Tocomar geothermal field (24°10S 66°34O). The absence of juvenile fragments (pumice and accessory
lithics) attests an origin from an eruption developed by 1) an hydrothermal system violently depressurised or 2) by the interaction
of hydrothermal fluids with overheated host rock (phreatic to hydro-geothermal explosion). Fragments produced by these phreatic
explosions were transported by base surges. Planar bed structures, sand-wave structures and bomb sags are the most common
depositional structures. Some pits perhaps related with this eruption were recognized, roughly prolate in shape 50 to 100 m in
diameter. The phreatic eruptions were triggered by horizontal dilation associated to a tectonic transference between main Ntrending
thrusts and the Calama-Olacapato-El Toro fault zone. The volcaniclastic deposits shows syn-depositional faulting. This
interpretation is an additional evidence of the tectonic activity of the Calama-Olacapato-El Toro fault in the Pleistocene,
reinforcing the geothermal potential of the Tocomar area.