1.03.01. Andean Geology
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Andean Geology es una revista revisada por pares que publica investigaciones y artículos de revisión de alta calidad sobre geología y ciencias relacionadas, con un enfoque en América del Sur, América Central, la Antártida y especialmente los Andes. La revista acepta contribuciones en español o inglés y está interesada en conjuntos temáticos de artículos. También publica trabajos de Paleontología sistemática, siempre que se enfoquen en la importancia cronoestratigráfica, paleoecológica o paleogeográfica de los taxones descritos.
Visita la página desde: http://www.andeangeology.cl
Visita la página desde: http://www.andeangeology.cl
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- CARLOS PÉREZ DE ARCE RAVEAU (1947-2024) 45 años de dedicación a la Geocronología
- Autor(es):
- Puig G., Alvaro
- Fecha de Publicación:
- 2024
- Fuente o Serie:
- Andean Geology
- Páginas:
- pp.562-563
- Número de Serie:
- 3
- The geology and geomorphology of Seymour (Marambio) Island, Antarctica
- Autor(es):
- Acosta Hospitaleche, Carolina; Gelfo, Javier N.
- Fecha de Publicación:
- 2024
- Fuente o Serie:
- Andean Geology
- Páginas:
- pp.559-561
- Número de Serie:
- 3
Montes, M.; Nozal, F.; Olivero, E.; Gallastegui, G.; Santillana, S.; Maestro, A.; López-Martínez, J.; González, L. and Martín-Serrano, A. (2019). Geología y Geomorfología de isla Marambio (Seymour). (Montes, M.; Nozal F. y Santillana, S., Eds.). Serie Cartográfica Geocientífica Antártica; 1:20.000, 1ª edición. Acompañado de mapas. Madrid-Instituto Geológico y Minero de España; Buenos Aires-Instituto Antártico Argentino, 300 p. 236 ilustraciones, 6 tablas, 2 mapas. ISBN 978-84-9138-083-2. EUR 60,00 - The subaqueous felsic volcanism from the Upper Member of the Cordón de Lila Complex, Antofagasta region, northern Chile
- Autor(es):
- Niemeyer, Hans
- Fecha de Publicación:
- 2024
- Fuente o Serie:
- Andean Geology
- Páginas:
- pp.547-558
- Número de Serie:
- 3
This contribution presents the study of an Ordovician subaqueous felsic succession, formed by the ~400 m-thick Upper Member of the Cordón de Lila Complex (CISL), northern Chile. From bottom to top, the succession starts with two dacitic sills that intruded into the sediments of the lowermost part of the Upper Member. Then, it is followed by a thick sedimentary deposit, two rhyolitic lavas, a volcanoclastic felsic breccia with pyroclastic clasts, and ends with a red rhyolitic lava. The first rhyolitic lava shows centimetric to metric folds with a north-northwestern vergence, evidence of flow in that direction. In the volcanoclastic breccia, an abundant pumice-and-fiamme-rich green matrix wraps around lithic clasts, giving the rock an eutaxitic texture at the outcrop scale. This matrix and texture evidence is characteristic of hot pyroclastic flows deposited under subaqueous conditions. The described section of the breccia is formed by four coarsening-up sequences, reflecting respectively four pulses of building up energy. The lack of internal erosional features points to a single and continuous explosive eruption. An accidental granite clast in the upper part of the breccia suggests a connection with a granitic body, possibly the Pingo-Pingo monzogranite. The geochemical character of the felsic succession is calc-alkaline. The tectonic setting diagram shows a within-plate setting for the succession. This suggests a shift from the arc position inferred for the Lower Member of the CISL to a forearc continental setting for the Upper Member of the CISL. - K-Ar geochronology of the western half of Tupungato volcano : The 1984 Hildreth-Drake-Fierstein expedition
- Autor(es):
- Godoy, Estanislao; Bertin, Daniel; Romero, Jorge E.; Amigo, Alvaro; Orts, Sergio
- Fecha de Publicación:
- 2024
- Fuente o Serie:
- Andean Geology
- Páginas:
- pp.538-546
- Número de Serie:
- 3
During 23 days in February 1984, the team made up by Wes Hildreth, Bob Drake, and Judy Fierstein explored and sampled much of the western half of the Tupungato volcano, a Chile-Argentina natural landmark at ~33.3° S, including its summit area. The project remained unfinished, and this impressive, ~6,550 m-high volcanic edifice was no longer the focus of significant studies. Forty years later, Wes Hildreth has given up and graciously handed over to us all his data, so it can now be shared with the geological community.
Bob Drake dated six samples of Tupungato through the K-Ar technique. In a dacite dome from the southern summit, interpreted as the youngest Tupungato activity, a hornblende age of 831±116 ka is reported. A long-standing controversy is thus resolved: Tupungato has no Holocene activity. 1.26±0.6 Ma to 932±90 ka plagioclase ages are reported from three andesite lavas from the lower to middle flank of the volcano, constraining the age of the edifice to the Early Pleistocene. Finally, hornblendes from two pre-Tupungato dacitic deposits at the volcano’s western foothill were dated at 11.4±0.5 Ma and 9.45±0.6 Ma. These much older deposits may represent pyroclastic rich facies similar to the ones described in the upper sections of the Tunuyán Conglomerates, in Argentina. - Evaluation of secondary effects after the January 18, 2021, Mw 6.5 earthquake in San Juan, Argentina : Determination of the seismic intensity through the ESI-2007 scale
- Autor(es):
- Palacios, Silvia Beatriz; Oro, Alejandro; Perucca, Laura Patricia
- Fecha de Publicación:
- 2024
- Fuente o Serie:
- Andean Geology
- Páginas:
- pp.518-537
- Número de Serie:
- 3
This study focuses on evaluating the numerous secondary effects, such as mass wasting and soil liquefaction, caused by the Mw 6.5 earthquake that occurred on January 18, 2021, in the province of San Juan, Argentina. The epicenter was located on the eastern flank of the Las Osamentas range. Although it caused significant damage to buildings and cultivated areas, there were no fatalities. The aim is to identify and describe these secondary effects and determine the seismic intensity of the event using the INQUA’s (International Union for Quaternary Research) 2007 ESI (Environmental Seismic Intensity) scale. Field assessments were conducted shortly after the earthquake, documenting liquefaction and mass wasting structures through direct observations, digital photographs, GPS (Global Positioning System) localization, and data inventory, among other methods. This procedure validates a protocol for future applications in estimating seismic intensities for sparsely populated areas. Additionally, the study seeks to confirm the scientific and cultural importance of these ephemeral structures as assets that could be protected, therefore contributing to regional development.