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An Integrated Analysis of the March 2015 Atacama Floods
PUBLICATIONS Geophysical Research Letters RESEARCH LETTER An integrated analysis of the March 2015 10.1002/2016GL069751 Atacama floods Key Points: Andrew C. Wilcox1, Cristian Escauriaza2,3, Roberto Agredano2,3,EmmanuelMignot2,4, Vicente Zuazo2,3, • Unique atmospheric, hydrologic, and 2,3,5 2,3,6 2,3,7,8 2,3 9 geomorphic factors generated the Sebastián Otárola ,LinaCastro , Jorge Gironás , Rodrigo Cienfuegos , and Luca Mao fl largest ood ever recorded in the 1 2 Atacama Desert Department of Geosciences, University of Montana, Missoula, Montana, USA, Departamento de Ingeniería Hidráulica y 3 • The sediment-rich nature of the flood Ambiental, Pontificia Universidad Católica de Chile, Santiago, Chile, Centro de Investigación para la Gestión Integrada de resulted from valley-fill erosion rather Desastres Naturales (CIGIDEN), Santiago, Chile, 4University of Lyon, INSA Lyon, CNRS, LMFA UMR5509, Villeurbanne, France, than hillslope unraveling 5Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA, 6Escuela de • Anthropogenic factors increased the fi 7 consequences of the flood and Ingeniería Civil, Ponti cia Universidad Católica de Valparaíso, Valparaíso, Chile, Centro de Desarrollo Urbano Sustentable 8 highlight the need for early-warning (CEDEUS), Santiago, Chile, Centro Interdisciplinario de Cambio Global, Pontificia Universidad Católica de Chile, Santiago, systems Chile, 9Departamento de Ecosistemas y Medio Ambiente, Pontificia Universidad Católica de Chile, Santiago, Chile Supporting Information: Abstract In March 2015 unusual ocean and atmospheric conditions produced many years’ worth of • Supporting Information S1 rainfall in a ~48 h period over northern Chile’s Atacama Desert, one of Earth’s driest regions, resulting in Correspondence to: catastrophic flooding. -
Igneous Rock Associations 25. Pre-Pliocene Andean Magmatism in Chile Veronica Oliveros, Pablo Moreno-Yaeger and Laura Flores
Document generated on 09/27/2021 6:01 a.m. Geoscience Canada Journal of the Geological Association of Canada Journal de l’Association Géologique du Canada Igneous Rock Associations 25. Pre-Pliocene Andean Magmatism in Chile Veronica Oliveros, Pablo Moreno-Yaeger and Laura Flores Volume 47, Number 1-2, 2020 Article abstract Andean-type magmatism and the term ‘andesite’ are often used as the norm for URI: https://id.erudit.org/iderudit/1070937ar the results of subduction of oceanic lithosphere under a continent, and the DOI: https://doi.org/10.12789/geocanj.2020.47.158 typical rock formed. Although the Andes chain occupies the whole western margin of South America, the most comprehensively studied rocks occur in the See table of contents present-day Chilean territory and are the focus of this paper. Andean magmatism in this region developed from the Rhaetian-Hettangian boundary (ca. 200 Ma) to the present and represents the activity of a long-lived Publisher(s) continental magmatic arc. This paper discusses Pre-Pleistocene volcanic, plutonic, and volcano-sedimentary rocks related to the arc that cover most of The Geological Association of Canada the continental mass of Chile (between the Pacific coast and the High Andes) between the latitudes of 18° and 50°S. They comprise most of the range of ISSN sub-alkaline igneous rocks, from gabbro to monzogranite and from basalt to rhyolite, but are dominated by the tonalite-granodiorite and andesite example 0315-0941 (print) members. Variations in the petrographic characteristics, major and trace 1911-4850 (digital) element composition and isotopic signature of the igneous rocks can be correlated to changes in the physical parameters of the subduction zone, such Explore this journal as dip angle of the subducting slab, convergence rate and angle of convergence. -
Peru, Bolivia and Northern Chile) from Eocene to Present
Tectonics and uplift in Central Andes (Peru, Bolivia and Northern Chile) from Eocene to present Abstract : The analysis of sedimenta y and volcank records, exposed in southern Peru, Bolivia, and norfhem Chile, allow us to establish the chronological evolution of Central Andes from Upper Eocene to Present. This analysis is based on fieid observations and a re-evaluation of the available geological data. It gives evidence for six discrete compressionai tectonic puises that are dated : Upper Eocene (ca 42 Ma), Upper Oligocene (ca 26-28 Ma). lower Miocene (ca 15- 17 Ma). middle Miocene (ca 10 Ma). Upper Miocene (ca 7 Ma) and early Ouaternary (ca 2 Ma), respectively. The magnitude of shortening and geographical extent of these compressional phases are highly variable. ln particular. the lower and middle Miocene compressional pulses could correspond to deformational climaxes chiefly characterized by compressionai tectonics. Generally these compressional pulses appear to be coeval with periods of high convergence rate. Moreover. available structural data on these phases suggest that their directions of shortening were roughly parallel to the orientation of convergence. Between these compressional pulses, basin infiliings take place.; they are highly variable in thickness and composition and these differences are in agreement with the different mechanics that may be put forward to explain the formations of Andean basin. Consequently they are indicative of the stress regimes that prevail between the compressional pulses. This stress regime should be mainly tensionai in the Altiplano, Western Cordillera and Fore-Arc basins. On the contrary, it is essentially compressional in the Subandean Lowlands. Magmatic activity has occurred in the High Andes since at least Upper Oligocene time (ca 25 Ma). -
Redalyc.MEDIR, AMOJONAR, REPARTIR: TERRITORIALIDADES Y PRÁCTICAS DEMARCATORIAS EN EL CAMINO INCAICO DE ATACAMA (II REGIÓN
Chungara, Revista de Antropología Chilena ISSN: 0716-1182 [email protected] Universidad de Tarapacá Chile Sanhueza Tohá, Cecilia MEDIR, AMOJONAR, REPARTIR: TERRITORIALIDADES Y PRÁCTICAS DEMARCATORIAS EN EL CAMINO INCAICO DE ATACAMA (II REGIÓN, CHILE) Chungara, Revista de Antropología Chilena, vol. 36, núm. 2, julio-diciembre, 2004, pp. 483-494 Universidad de Tarapacá Arica, Chile Disponible en: http://www.redalyc.org/articulo.oa?id=32636218 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Medir, Amojonar, Repartir: Territorialidades y Prácticas Demarcatorias…Volumen 36, Nº 2, 2004. Páginas 483-494483 Chungara, Revista de Antropología Chilena MEDIR, AMOJONAR, REPARTIR: TERRITORIALIDADES Y PRÁCTICAS DEMARCATORIAS EN EL CAMINO INCAICO DE ATACAMA (II REGIÓN, CHILE) MEASURING, POSTING, ALLOCATION: TERRITORIALITY AND DEMARCATION PRACTICES ALONG THE ATACAMA INKA ROAD (II REGION, CHILE) Cecilia Sanhueza Tohá* A partir del registro arqueológico de los caminos incaicos de la antigua región de Atacama (II Región, Chile), se desarrolla un análisis etnohistórico interpretativo de los denominados hitos, mojones o topus, identificados como un rasgo característico de la vialidad estatal. Desde los antecedentes aportados por la literatura colonial y los vocabularios indígenas, se incursiona en los contenidos semánticos asociados a este tipo de estructuras, estableciendo que estos aparentes señalizadores de ruta podrían estar expresando la aplicación de complejos mecanismos andinos de medición o de regulación de prácticas de desplazamiento en el Capac Ñan, así como de organización de territorialidades o espacios sociales. -
Composition of Zooplankton Resting Eggs Bank As Indicator of Long-Term Exposure to Metals in an Atacama Desert Lagoon
Geophysical Research Abstracts Vol. 21, EGU2019-12098, 2019 EGU General Assembly 2019 © Author(s) 2019. CC Attribution 4.0 license. Composition of zooplankton resting eggs bank as indicator of long-term exposure to metals in an Atacama Desert lagoon Adriana Aránguiz-Acuña (1), Nancy León (1,2), Rodrigo Castillo (2), and Volker Wennrich (3) (1) Universidad Católica del Norte, CEITSAZA, Chile ([email protected]), (2) Chemistry Department, Science Faculty, Universidad Católica del Norte, Chile., (3) Institute of Geology and Mineralogy. Universität zu Köln, Germany Geochemical signatures in hydrologically closed-basin lakes, especially in arid regions can be interpreted as changes in past environmental conditions. Inca Coya (22º20’S-68º35’W) is a small and shallow (18 m) lagoon located 2534 m.a.s.l in the Antofagasta region, northern Chile. The lagoon connects to a shallow upper aquifer well that is tightly coupled to Salado River, as it is located <500 m from it, near its juncture with Loa River. Salado River is arsenic-enriched by water from the El Tatio geothermal fields, reaching levels up around 30 mg As L-1. The extremely arid conditions and high evaporation maintain high concentrations not only of arsenic but also of copper, boron, chloride, sulfate and others throughout the Loa River’s course. Also, Chiu-Chiu village is near than several open-pit copper mines and some large mine tailings. We previously found high concentrations of total metals in Inca-Coya lagoon surface sediments which are in the range of or higher than those found in mining-impacted water bodies. Zooplankton egg banks in lake sediments provide an excellent system for reconstructing conditions experienced before and during diapause (in which resting eggs are produced), because layered deposits retain both resting eggs and traces of the chemical and biological conditions present in the water column at a given time. -
Groundwater Origin and Recharge in the Hyperarid Cordillera De La Costa, Atacama Desert, Northern Chile
Groundwater origin and recharge in the hyperarid Cordillera de la Costa, Atacama Desert, northern Chile. Christian Herrera1,2, Carolina Gamboa1,2, Emilio Custodio3, Teresa Jordan4, Linda Godfrey5, Jorge Jódar6, José A. Luque1,2, Jimmy Vargas7, Alberto Sáez8 1 Departmento de Ciencias Geológicas , Universidad Católica del Norte, Antofagasta, Chile 2 CEITSAZA‐Research and Technological Center of Water in the Desert, Northern Catholic University, Antofagasta, Chile 3 Groundwater Hydrology Group, Dept. Civil and Environmental Eng., Technical University of Catalonia (UPC). Royal Academy of Sciences of Spain 4 Department of Earth & Atmospheric Sciences and Atkinson Center for a Sustainable Future, Snee Hall, Cornell University, Ithaca, NY 14853‐1504, USA 5 Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854, USA. 6 Groundwater Hydrology Group, Dept. Civil and Environmental Eng., Technical University of Catalonia (UPC), Hydromodel Host S.L. and Aquageo Proyectos S.L., Spain 7 Mining Company Los Pelambres, Av. Apoquindo 4001 Piso 18, Las Condes, Santiago, Chile 8 Department of Earth and Ocean Dynamics, University of Barcelona, C. Martí i Franqués s/n, 08028 Barcelona, Spain GRAPHICAL ABSTRACT 1 Highlights ‐Small springs have been recognized in the hyper‐arid coastal zone of the Atacama Desert ‐The δ18O and δ2H values of spring waters are similar to coastal region rainfall ‐The average residence time of the waters from springs varies between 1 and 2 hyr, up to 5 hyr ‐Waters from the deep wells are isotopically much heavier than those of springs ‐Turnover time for deep waters varies between 7 and 13 hyr, which overlaps the CAPE events ABSTRACT The Cordillera de la Costa is located along the coastline of northern Chile, in the hyperarid Atacama Desert area. -
A Solution to the Enigma of the Type Locality Of
PREPRINT Author-formatted, not peer-reviewed document posted on 27/04/2021 DOI: https://doi.org/10.3897/arphapreprints.e67941 A solution to the enigma of the type locality of Telmatobius halli Noble, 1938 (Anura: Telmatobiidae), a lost frog for 85 years Claudio Correa Author-formatted, not peer-reviewed document posted on 27/04/2021. DOI: https://doi.org/10.3897/arphapreprints.e67941 A solution to the enigma of the type locality of Telmatobius halli Noble, 1938 (Anura: Telmatobiidae), a lost frog for 85 years CLAUDIO CORREAa aLaboratorio de Sistemática y Conservación de Herpetozoos, Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Barrio Universitario S/N, Concepción, Chile E-mail address: [email protected] Abstract For 80 years, there were no sightings of the Andean amphibian Telmatobius halli due to the ambiguity with which its type locality was described (“warm spring near Ollagüe”, northern Chile). The type specimens were collected during the International High Altitude Expedition to Chile (IHAEC) of 1935, but they were later described in 1938. Recently, in 2018 and 2020, two studies independently reported the rediscovery of the species. Although in these studies live specimens were analyzed and bibliographic references were consulted, both reached different conclusions about its identity and distribution. The 2018 proposal identifies the populations of the Chijlla-Choja and Copaquire ravines (previously assigned to T. chusmisensis) as T. halli, whereas the 2020 proposal identifies the hot spring “Aguas Calientes”, located in the Carcote salt flat some 12 km SW of Ollagüe, as its type locality. The problem with these two proposals is that these populations are more phylogenetically related to other species than to each other, so they clearly do not belong to the same taxon. -
Origin of Waters from Small Springs Located at the Northern Coast of Chile, in the Vicinity of Antofagasta
Andean Geology 41 (2): 314-341. May, 2014 Andean Geology doi: 10.5027/andgeoV41n2-a03 formerly Revista Geológica de Chile www.andeangeology.cl Origin of waters from small springs located at the northern coast of Chile, in the vicinity of Antofagasta Christian Herrera1, Emilio Custodio2 1 Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile. [email protected] 2 Departamento de Ingeniería del Terreno, Universidad Politécnica de Cataluña (UPC), Gran Capitán s/n, Ed. D-2, 08034, Barce- lona, España. [email protected] ABSTRACT. The origin of waters from small springs located at the hyper-arid northern coast of Chile, in the vicinity of Antofagasta, is discussed after hydrogeochemical and isotopic studies and supported by groundwater flow hydrodynamic considerations. Spring water is brackish to saline, with electrical conductivity ranging from 2 to 25 mS/cm. Chemical and water isotope data (18O and 2H) show that the rainfall events that produced part of the recharge could correspond to wetter conditions than at present. Their origin could be related to the emplacement of warm sea currents facing the coast of northern Chile, possibly associated to incursions of El Niño Southern Oscillation (ENSO). Radiocarbon dating and preliminary groundwater hydraulic calculations indicate that these spring waters could be remnants of a more significant recharge in the Cordillera de la Costa than that produced today during the less arid period about 5,000 to 3,000 years ago. The exception is Las Vertientes spring which is the only one that receives water transferred from the Central Depression. The springs are the visible discharge of a regional groundwater body in the very low permeability Cordillera de la Costa, whose hydraulic conductivity decreases downward and flow is dominantly though fissures and storage in the low porosity rock matrix. -
Volcanology and Petrology of Volcán Miño, Andean Central Volcanic Zone
AN ABSTRACT OF THE THESIS OF Claire M. McKee for the degree of Master of Science in Geology presented on June 29, 2001. Title: Volcanology and Petrology of VolcáIi Miño, Andean Central Volcanic Zone. Redacted for Privacy Anitá'L. Grunder Volcán Miño (21011'S) is located on the westernmost periphery of a long- lived complex of stratovolcarioes and domes called the Aucanquilcha Complex. The Aucanquilcha Complex ranges in age from 11 Ma to 1-lolocene and lies along the main N-S trending axis of Quaternary volcanoes in the Andean Central Volcanic Zone (CVZ). Volcán Aucanquitcha lies at the center of the complex and forms a ridge extending 10 km in an east-west direction; defined by a distinct cluster of andesite and dacite stratocones, dacite domes and a prominent collapse structure and two debris avalanche deposits. In contrast to the main edifice, Volcán Miño (5611 m) is a steep-sided, symmetric andesitic stratovolcano. Volcán Miño lavas range in age from 3.0 to 3.7 Ma and eruptive products are dominantly two-pyroxene ± hornblende andesites. Basaltic andesites and dacites are rare. - ----- - ------ ---I, ..--.- __, IuIVULJ, LII Volcán Miño lavas conform to regional med- to high-potassium caic-alkaline trends and are characterized by subduction-related light rare earth and large ion lithophile-element enrichments and high field strength element depletions. Miño lavas are distinctive in that they display a restricted range in whole-rock composition, 60±2 weight percent Si02. Despite this whole- rock compositional homogeneity, lavas are texturally and mineralogically diverse as evidenced by variations of proportions and textures of clinopyroxene, orthopyroxene, and amphibole in assemblages with similar weight percent Si02. -
Flora Del Salar De Ascotan, Región De Antofagasta (Ii Región), Chile
FLORA DEL SALAR DE ASCOTAN, REGIÓN DE ANTOFAGASTA (II REGIÓN), CHILE Saltmarsh vascular flora at Ascotán. Región de Antofagasta (II). Chile Sebastián Teillier A. Escuela de Ecología y Paisajismo, Universidad Central e-mail: [email protected] RESUMEN En este trabajo se da cuenta de la flora vascular del salar de Ascotán. Este salar esta conformado por una serie de afloramientos de agua dulce que convergen hacia el centro del salar en una laguna, existiendo un fuerte gradiente de salinidad, desde el afloramiento hacia la laguna, donde la salinidad es muy alta y la vegetación desaparece. La flora vascular esta formada por unas 22 especies. Todas las especies encontradas son nativas, sin embargo, no se detectaron especies endémicas de Chile. Respecto a su distribución geográfica en Chile, se encontraron elementos de distribución predominante en los salares del Altiplano (rara vez sobrepasan en los 30°S), elementos de distribución en salares y humedales ubicados en la zona, pero a menor altitud ("desérticos"), y elementos de amplia distribución en los humedales del país. Palabras clave: flora, salar, Chile, Altiplano ABSTRACT Ascotan saltmarsh has several freshwater springs that flows into a central shallow saline lagoon. An increasing salinity gradient was observed from the springs too the central lagoo, thus restricting terestrial vegetation to the less salty areas next to the springs. There were 22 vascular plant species in the saltmarsh, all of them were native species but no chilean endemics were found. Geographic ranges of plant species in Chile, could be separated in categories: species with altiplanic distribution that are not found beyond 30°S latitude), species that grows also in saltmarshes and other wetlands at lower altitudes, and species with a broad distribution in chilean wetlands. -
Inca Rule in Caspana: an Approach to Andean Political Thinking (Loa River, Northern Chile)
Leonor Adán A. and Mauricio Uribe R. Inca rule in Caspana: an approach to Andean political thinking (Loa River, northern Chile) INCA RULE IN CASPANA: AN APPROACH TO ANDEAN POLITICAL THINKING (LOA RIVER, NORTHERN CHILE)1 Leonor Adán A.2 and Mauricio Uribe R.3 D Introduction Abstract The abundance of Inca remains – or remains associated This paper presents the archaeological record for five late with their expansion – over a large part of Chilean terri- pre-Hispanic sites located in Caspana, in order to discuss tory has made the Inca problem one of the most attractive Inca expansion in the upper river Loa basin (Atacama Desert). A first categorization of these sites enables to establish subjects for Chilean archaeologists. Nevertheless it has a distinction between: a) locals settlements with low received only indirect or occasional attention and there presence of inca features –the case of Aldea Talikuna and is a lack of continuity in existing studies; these factors Estancia Mulorojte; b) pure inca settlements, which include contribute to the poor exploitation of the opportunities Cerro Verde, Incahuasi Inca and Vega Salada –mineral, which these material remains offer and of the abundant agricultural and/or cattle sites, and c) shared settlements where both identities are displayed in a symbolically laden documentary and oral history about the Andean world. context –like Los Abuelos cemetery. Our analysis of the This absence of a research line translates into minimal material culture associated to these sites suggests a set of comprehension of the impact of the Tawantinsuyu in the significant differences and similarities that would be the country, as has been remarked on: result of a direct and planned ruling strategy deployed by the Inca State through elaborately complex symbolical means. -
Peligros Volcánicos Proximales - Hoja 2 De 5 Servicio Nacional De Geología Y Minería Escala 1:250.000 Leyenda
MAPA1: PELIGROS VOLCÁNICOS PROXIMALES - HOJA 2 DE 5 SERVICIO NACIONAL DE GEOLOGÍA Y MINERÍA ESCALA 1:250.000 LEYENDA PROCESOS ERUPTIVOS EN ZONAS PROXIMALES 69° 69°7' 490 km 500 510 50'520 530 40'540 550 30'560 20'570 580 10'590 600 68° 610 km 67°55' 20°32' 20°32' Alto Peligro. Representa el sector más susceptible de ser afectado por procesos eruptivos en el entorno inmediato del edificio volcánico, como flujos de lavas, proyecciones balísticas y corrientes piroclásticas, de forma Paso Abra Oriente de Napa independiente de la magnitud eruptiva. Respecto al registro geológico, incorpora la totalidad de las emisiones de lava posglaciales, proyecciones balísticas y depósitos de flujo piroclástico asociados a colapsos de columnas eruptivas (flujos de escorias o de pómez) y a colapso de domos (flujos de bloques y ceniza), además de zonas proximales de flujos de detritos (lahares). Moderado Peligro. Representa el sector más susceptible de ser afectado por procesos eruptivos derivados de erupciones de mediana a alta magnitud en el edificio principal, como corrientes piroclásticas, avalanchas de MAPA DE UBICACIÓN detritos volcánicos y flujos de detritos. En general, comprende zonas ubicadas en un radio menor a 5 km en torno 7 720 7 720 a la base de los edificios volcánicos. km km Respecto al registro geológico, incorpora la totalidad de emisiones de lavas preglaciales, los segmentos distales 68º00' de los depósitos de flujo piroclástico por colapso de domos (flujo de bloques y ceniza), la mayoría de los depósitos 72º 68º 71º00' 70º00' 0# Campamento Azufrero PERÚ PERÚ Planta Azufrera " de avalanchas volcánicas y las zonas de inundación por flujos de detritos.