Scale Deformation of Volcanic Centres in the Central Andes
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Hydrothermal Alteration, Fumarolic Deposits and Fluids from Lastarria Volcanic Complex: a Multidisciplinary Study
Andean Geology 42 (3): 166-196. May, 2016 Andean Geology doi: 10.5027/andgeoV43n2-a02 www.andeangeology.cl Hydrothermal alteration, fumarolic deposits and fluids from Lastarria Volcanic Complex: A multidisciplinary study *Felipe Aguilera1, Susana Layana2, Augusto Rodríguez-Díaz3, Cristóbal González2, Julio Cortés4, Manuel Inostroza2 1 Departamento de Ciencias Geológicas, Universidad Católica del Norte, Avda. Angamos 0610, Antofagasta, Chile. [email protected] 2 Programa de Doctorado en Ciencias mención Geología, Universidad Católica del Norte, Avda. Angamos 0610, Antofagasta, Chile. [email protected]; [email protected]; [email protected] 3 Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04150 México D.F., México. [email protected] 4 Consultor Independiente, Las Docas 4420, La Serena, Chile. [email protected] * Corresponding Author: [email protected] ABSTRACT. A multidisciplinary study that includes processing of Landsat ETM+ satellite images, chemistry of gas condensed, mineralogy and chemistry of fumarolic deposits, and fluid inclusion data from native sulphur deposits, has been carried out in the Lastarria Volcanic Complex (LVC) with the objective to determine the distribution and charac- teristics of hydrothermal alteration zones and to establish the relations between gas chemistry and fumarolic deposits. Satellite image processing shows the presence of four hydrothermal alteration zones, characterized by a mineral -
Geothermal Exploration at Irruputuncu and Olca Volcanoes: Pursuing a Sustainable Mining Development in Chile
GRC Transactions, Vol. 35, 2011 Geothermal Exploration at Irruputuncu and Olca Volcanoes: Pursuing a Sustainable Mining Development in Chile Nicolás Reyes1, Ariel Vidal2, Ernesto Ramirez2, Knutur Arnason3, Bjarni Richter3, Benedikt Steingrimsson3, Orlando Acosta1, Jorge Camacho1 1Compañía Minera Doña Inés de Collahuasi 2Geohidrología Consultores Ltda. 3ISOR Iceland GeoSurvey Keyword Introduction Chile, Olca & Irruputuncu volcanoes, geothermal exploration, CMDIC (Compañía Minera Doña Inés de Collahuasi) Doña Inés de Collahuasi Mining Company (CMDIC) is the third largest copper producer in Chile. In its commitment to sus- tainable development, and its need for safe and clean energy as part Abstract of its energy matrix, CMDIC has chosen to explore and evaluate geothermal resources in the proximity of its copper mining in the Doña Inés de Collahuasi Mining Company which is the north of Chile (Figure 1). Currently the mining operation requires third major copper producer in Chile is pursuing a sustainable 180MW of electric power, which is mainly derived from fossil development by exploring geothermal resources. Currently the fuels. The company objective is to obtain at least 35MW from mining operation requires 180MW of electric power, which is renewable energy sources by 2015. derived from fossil fuels. However, the company´s objective is CMDIC has a set of geothermal exploration permits in the to obtain at least 35MW from renewable energy sources by 2015. proximity of the mine around the Irruputuncu and Olca volcanoes. The geothermal exploration is focused around the Olca and Irruputuncu volcanoes in the Chilean Altiplano at 4000-5000 m a.s.l. in the vicinity of the copper mine. Irruputuncu is an active dacitic stratovolcano, with fumaroles at the top crater and one acid-sulphate hot spring at the base of the volcano. -
Freshwater Diatoms in the Sajama, Quelccaya, and Coropuna Glaciers of the South American Andes
Diatom Research ISSN: 0269-249X (Print) 2159-8347 (Online) Journal homepage: http://www.tandfonline.com/loi/tdia20 Freshwater diatoms in the Sajama, Quelccaya, and Coropuna glaciers of the South American Andes D. Marie Weide , Sherilyn C. Fritz, Bruce E. Brinson, Lonnie G. Thompson & W. Edward Billups To cite this article: D. Marie Weide , Sherilyn C. Fritz, Bruce E. Brinson, Lonnie G. Thompson & W. Edward Billups (2017): Freshwater diatoms in the Sajama, Quelccaya, and Coropuna glaciers of the South American Andes, Diatom Research, DOI: 10.1080/0269249X.2017.1335240 To link to this article: http://dx.doi.org/10.1080/0269249X.2017.1335240 Published online: 17 Jul 2017. Submit your article to this journal Article views: 6 View related articles View Crossmark data Full Terms & Conditions of access and use can be found at http://www.tandfonline.com/action/journalInformation?journalCode=tdia20 Download by: [Lund University Libraries] Date: 19 July 2017, At: 08:18 Diatom Research,2017 https://doi.org/10.1080/0269249X.2017.1335240 Freshwater diatoms in the Sajama, Quelccaya, and Coropuna glaciers of the South American Andes 1 1 2 3 D. MARIE WEIDE ∗,SHERILYNC.FRITZ,BRUCEE.BRINSON, LONNIE G. THOMPSON & W. EDWARD BILLUPS2 1Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, NE, USA 2Department of Chemistry, Rice University, Houston, TX, USA 3School of Earth Sciences and Byrd Polar and Climate Research Center, The Ohio State University, Columbus, OH, USA Diatoms in ice cores have been used to infer regional and global climatic events. These archives offer high-resolution records of past climate events, often providing annual resolution of environmental variability during the Late Holocene. -
Appendix A. Supplementary Material to the Manuscript
Appendix A. Supplementary material to the manuscript: The role of crustal and eruptive processes versus source variations in controlling the oxidation state of iron in Central Andean magmas 1. Continental crust beneath the CVZ Country Rock The basement beneath the sampled portion of the CVZ belongs to the Paleozoic Arequipa- Antofalla terrain – a high temperature metamorphic terrain with abundant granitoid intrusions that formed in response to Paleozoic subduction (Lucassen et al., 2000; Ramos et al., 1986). In Northern Chile and Northwestern Argentina this Paleozoic metamorphic-magmatic basement is largely homogeneous and felsic in composition, consistent with the thick, weak, and felsic properties of the crust beneath the CVZ (Beck et al., 1996; Fig. A.1). Neodymium model ages of exposed Paleozoic metamorphic-magmatic basement and sediments suggest a uniform Proterozoic protolith, itself derived from intrusions and sedimentary rock (Lucassen et al., 2001). AFC Model Parameters Pervasive assimilation of continental crust in the Central Andean ignimbrite magmas is well established (Hildreth and Moorbath, 1988; Klerkx et al., 1977; Fig. A.1) and has been verified by detailed analysis of radiogenic isotopes (e.g. 87Sr/86Sr and 143Nd/144Nd) on specific systems within the CVZ (Kay et al., 2011; Lindsay et al., 2001; Schmitt et al., 2001; Soler et al., 2007). Isotopic results indicate that the CVZ magmas are the result of mixing between a crustal endmember, mainly gneisses and plutonics that have a characteristic crustal signature of high 87Sr/86Sr and low 145Nd/144Nd, and the asthenospheric mantle (low 87Sr/86Sr and high 145Nd/144Nd; Fig. 2). In Figure 2, we model the amount of crustal assimilation required to produce the CVZ magmas that are targeted in this study. -
Chapter 2 Alaska’S Igneous Rocks
Chapter 2 Alaska’s Igneous Rocks Resources • Alaska Department of Natural Resources, 2010, Division of Geological and Geophysical Surveys, Alaska Geologic Materials Center website, accessed May 27, 2010, at http://www.dggs.dnr.state.ak.us/?link=gmc_overview&menu_link=gmc. • Alaska Resource Education: Alaska Resource Education website, accessed February 22, 2011, at http://www.akresource.org/. • Barton, K.E., Howell, D.G., and Vigil, J.F., 2003, The North America tapestry of time and terrain: U.S. Geological Survey Geologic Investigations Series I-2781, 1 sheet. (Also available at http://pubs.usgs.gov/imap/i2781/.) • Danaher, Hugh, 2006, Mineral identification project website, accessed May 27, 2010, at http://www.fremontica.com/minerals/. • Digital Library for Earth System Education, [n.d.], Find a resource—Bowens reaction series: Digital Library for Earth System Education website, accessed June 10, 2010, at http://www.dlese.org/library/query.do?q=Bowens%20reaction%20series&s=0. • Edwards, L.E., and Pojeta, J., Jr., 1997, Fossils, rocks, and time: U.S. Geological Survey website. (Available at http://pubs.usgs.gov/gip/fossils/contents.html.) • Garden Buildings Direct, 2010, Rocks and minerals: Garden Buildings Direct website, accessed June 4, 2010, at http://www.gardenbuildingsdirect.co.uk/Article/rocks-and- minerals. • Illinois State Museum, 2003, Geology online–GeoGallery: Illinois State Museum Society database, accessed May 27, 2010 at http://geologyonline.museum.state.il.us/geogallery/. • Knecht, Elizebeth, designer, Pearson, R.W., and Hermans, Majorie, eds., 1998, Alaska in maps—A thematic atlas: Alaska Geographic Society, 100 p. Lillie, R.J., 2005, Parks and plates—The geology of our National parks, monuments, and seashores: New York, W.W. -
Full-Text PDF (Final Published Version)
Pritchard, M. E., de Silva, S. L., Michelfelder, G., Zandt, G., McNutt, S. R., Gottsmann, J., West, M. E., Blundy, J., Christensen, D. H., Finnegan, N. J., Minaya, E., Sparks, R. S. J., Sunagua, M., Unsworth, M. J., Alvizuri, C., Comeau, M. J., del Potro, R., Díaz, D., Diez, M., ... Ward, K. M. (2018). Synthesis: PLUTONS: Investigating the relationship between pluton growth and volcanism in the Central Andes. Geosphere, 14(3), 954-982. https://doi.org/10.1130/GES01578.1 Publisher's PDF, also known as Version of record License (if available): CC BY-NC Link to published version (if available): 10.1130/GES01578.1 Link to publication record in Explore Bristol Research PDF-document This is the final published version of the article (version of record). It first appeared online via Geo Science World at https://doi.org/10.1130/GES01578.1 . Please refer to any applicable terms of use of the publisher. University of Bristol - Explore Bristol Research General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/red/research-policy/pure/user-guides/ebr-terms/ Research Paper THEMED ISSUE: PLUTONS: Investigating the Relationship between Pluton Growth and Volcanism in the Central Andes GEOSPHERE Synthesis: PLUTONS: Investigating the relationship between pluton growth and volcanism in the Central Andes GEOSPHERE; v. 14, no. 3 M.E. Pritchard1,2, S.L. de Silva3, G. Michelfelder4, G. Zandt5, S.R. McNutt6, J. Gottsmann2, M.E. West7, J. Blundy2, D.H. -
Depth and Degree of Melting of Komatiites
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 97, NO. B4, PAGES 4521-4540, APRIL 10, 1992 Depth and Degree of Melting of Komatiites CLAUDE HERZBERG Departmentof GeologicalSciences, Rutgers University,New Brunswick,New Jersey Mineral PhysicsInstitute, State Universityof New York, StonyBrook, New York High pressuremelting experimentsßhove ." v .......... new constraintsto be placedon the depthand degreeof partial melting of komatiites. Komatiitesfrom GorgonaIsland were formed by relatively low degreesof pseudoinvariantmelting(< 30 %)involving L + O1 + Opx + Cpx + Gt on the solidusat 40 kbar, about 130 km depth. Munro-typekomatiites were separatedfrom a harzburgiteresidue (L + O1 + Opx) at pressuresthat are poorly constrained,but were probablyaround 50 kbar, about 165 km depth;the degreeof partial melting was <40%. Komatiites from the BarbertonMountain Land were formed by high degrees(-50 %) of pseudoinvariantmelting (L + O1 + Gt + Cpx) of fertile mantleperidotitc in the 80- to 100-kbarrange, about 260- to 330- km depth. Secularvariations in the geochemistryof komatiitescould have formed in response to a reductionin the temperatureand pressureof meltingwith time. The 3.5 Ga Barbertonkomatiites and the 2.7 Ga Munro-typekomatiites could have formedin plumesthat were hotterthan the present-daymantle by 500ø and 30(Y',respectively. When excesstemperatures are this size, melting is deeperand volcanismchanges from basalticto komatiitic. The komatiitesfrom Gorgona Island, which are Mesozoic in age, may be representativeof komatiitesthat are predictedto occur in oceanicplateaus of Cretaceousage throughoutthe Pacific [Storey et al., 1991]. 1. INTRODUCTION range of CaO and A1203contents in the 80- to 160-kbar range. A calibration has been made of the effect of pressure on Komatiites are high MgO volcanic rocks that can be CaO/(CaO + A1203)and MgO in komatiiticliquids formed on roughly explained by high degrees of melting of mantle the solidus, and an examinationhas been made of the effect of peridotitc,typically 50 to 100 % [e.g., Vi.ljoenand Vi.ljoen, FeO. -
Iv BOLIVIA the Top of the World
iv BOLIVIA The top of the world Bolivia takes the breath away - with its beauty, its geographic and cultural diversity, and its lack of oxygen. From the air, the city of La Paz is first glimpsed between two snowy Andean mountain ranges on either side of a plain; the spread of the joined-up cities of El Alto and La Paz, cradled in a huge canyon, is an unforgettable sight. For passengers landing at the airport, the thinness of the air induces a mixture of dizziness and euphoria. The city's altitude affects newcomers in strange ways, from a mild headache to an inability to get up from bed; everybody, however, finds walking up stairs a serious challenge. The city's airport, in the heart of El Alto (literally 'the high place'), stands at 4000 metres, not far off the height of the highest peak in Europe, Mont Blanc. The peaks towering in the distance are mostly higher than 5000m, and some exceed 6000m in their eternally white glory. Slicing north-south across Bolivia is a series of climatic zones which range from tropical lowlands to tundra and eternal snows. These ecological niches were exploited for thousands of years, until the Spanish invasion in the early sixteenth century, by indigenous communities whose social structure still prevails in a few ethnic groups today: a single community, linked by marriage and customs, might live in two or more separate climes, often several days' journey away from each other on foot, one in the arid high plateau, the other in a temperate valley. -
The Science Behind Volcanoes
The Science Behind Volcanoes A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from the magma chamber below the surface. Volcanoes are generally found where tectonic plates are diverging or converging. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust in the interiors of plates, e.g., in the East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America. This type of volcanism falls under the umbrella of "Plate hypothesis" volcanism. Volcanism away from plate boundaries has also been explained as mantle plumes. These so- called "hotspots", for example Hawaii, are postulated to arise from upwelling diapirs with magma from the core–mantle boundary, 3,000 km deep in the Earth. Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. Volcanic ash can be a threat to aircraft, in particular those with jet engines where ash particles can be melted by the high operating temperature. Large eruptions can affect temperature as ash and droplets of sulfuric acid obscure the sun and cool the Earth's lower atmosphere or troposphere; however, they also absorb heat radiated up from the Earth, thereby warming the stratosphere. -
Evaluación Del Riesgo Volcánico En El Sur Del Perú
EVALUACIÓN DEL RIESGO VOLCÁNICO EN EL SUR DEL PERÚ, SITUACIÓN DE LA VIGILANCIA ACTUAL Y REQUERIMIENTOS DE MONITOREO EN EL FUTURO. Informe Técnico: Observatorio Vulcanológico del Sur (OVS)- INSTITUTO GEOFÍSICO DEL PERÚ Observatorio Vulcanológico del Ingemmet (OVI) – INGEMMET Observatorio Geofísico de la Univ. Nacional San Agustín (IG-UNSA) AUTORES: Orlando Macedo, Edu Taipe, José Del Carpio, Javier Ticona, Domingo Ramos, Nino Puma, Víctor Aguilar, Roger Machacca, José Torres, Kevin Cueva, John Cruz, Ivonne Lazarte, Riky Centeno, Rafael Miranda, Yovana Álvarez, Pablo Masias, Javier Vilca, Fredy Apaza, Rolando Chijcheapaza, Javier Calderón, Jesús Cáceres, Jesica Vela. Fecha : Mayo de 2016 Arequipa – Perú Contenido Introducción ...................................................................................................................................... 1 Objetivos ............................................................................................................................................ 3 CAPITULO I ........................................................................................................................................ 4 1. Volcanes Activos en el Sur del Perú ........................................................................................ 4 1.1 Volcán Sabancaya ............................................................................................................. 5 1.2 Misti .................................................................................................................................. -
Volcán Lascar
Volcán Lascar Región: Antofagasta Provincia: El Loa Comuna: San Pedro de Atacama Coordenadas: 21°22’S – 67°44’O Poblados más cercanos: Talabre – Camar – Socaire Tipo: Estratovolcán Altura: 5.592 m s.n.m. Diámetro basal: 8.9 km Área basal: 62.2 km2 Volumen estimado: 28.5 km3 Última actividad: 2015 Última erupción mayor: 1993 Volcán Lascar. Vista desde el norte Ranking de riesgo (Fotografía: Gabriela Jara, SERNAGEOMIN) 14 específico: Generalidades El volcán Láscar corresponde a un estratovolcán compuesto, elongado en dirección este-oeste, activo desde hace unos 240 ka y emplazado en el margen oeste de la planicie altiplánica. Está conformado por lavas andesíticas, que alcanzan más de 10 km de longitud, y por potentes lavas dacíticas que se extienden hasta 5 km, las que fueron emitidas desde los flancos NO a SO. La lava más reciente se estima en 7 mil años de antigüedad. En los alrededores del volcán se reconocen depósitos de flujo y caída piroclástica, además de numerosos cráteres de impacto asociados a la eyección de bombas durante erupciones plinianas y subplinianas. El principal evento eruptivo durante su evolución se denomina Ignimbrita Soncor, generado hace unos 27 ka al oeste del volcán y con un volumen estimado cercano a los 10 km3. En la cima de este volcán se observan seis cráteres, algunos anidados, y el central de estos se encuentra activo. Registro eruptivo Este volcán ha presentado alrededor de 30 erupciones explosivas desde el siglo XIX, lo que lo convierte en el volcán más activo del norte de Chile. Estos eventos han consistido típicamente en erupciones vulcanianas de corta duración, con emisión de ceniza fina y proyecciones balísticas en un radio de 5 km, donde el último evento de este tipo ocurrió el 30 de octubre del 2015. -
Universidad Nacional De San Agustín Facultad De Ingeniería Geológica Geofísica Y Minas Escuela Profesional De Ingeniería Geológica
UNIVERSIDAD NACIONAL DE SAN AGUSTÍN FACULTAD DE INGENIERÍA GEOLÓGICA GEOFÍSICA Y MINAS ESCUELA PROFESIONAL DE INGENIERÍA GEOLÓGICA “ESTUDIO GEOLÓGICO, PETROGRÁFICO Y GEOQUÍMICO DEL COMPLEJO VOLCÁNICO AMPATO - SABANCAYA (Provincia Caylloma, Dpto. Arequipa)” Tesis presentada por: Bach. Rosmery Delgado Ramos Para Optar el Grado Académico de Ingeniero Geólogo AREQUIPA – PERÚ 2012 AGRADECIMIENTOS Quiero manifestar mis más sinceros agradecimientos a todas las personas que fueron parte esencial en mi formación profesional, personal y toda mi vida. Agradezco a mis padres, Victor R. Delgado Delgado y Rosa Luz Ramos Vega, por su constante apoyo y que a pesar de las dificultades y caídas siempre estaban conmigo para cuidarme, ayudarme y sobre todo amarme. A mis hermanos Renzo R. y Angela V. Delgado Ramos que con su optimismo y perseverancia me ayudaron a enfrentar los caminos difíciles de la vida y seguir con mis ideales. Agradezco también a mis asesores al Dr. Marco Rivera y Dr. Pablo Samaniego, que con su paciencia, consejos, regaños, apoyo incondicional y sus grandes enseñanzas, cultivaron en mí la pasión por la investigación y las ganas de alcanzar mis objetivos. Agradezco al Instituto Geológico Minero y Metalúrgico y al convenio de colaboración con el IRD a cargo del Dr. Pablo Samaniego, por la beca que me otorgó durante el período en el cual realice mi tesis. Gracias a mi asesor de tesis el Dr. Fredy García de la Universidad Nacional de San Agustín que por su revisión detallada y gran apoyo benefició en este trabajo. Agradezco al SENAMHI por proporcionarme los datos de clima, fundamentales para el desarrollo de esta tesis.