Kinematics of the Active West Andean Fold-And-Thrust Belt (Central Chile): Structure and Long-Term Shortening Rate
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Petrology and Geochemistry of Volcanic Rocks Behind the Cenozoic Arc Front in the Andean Cordillera, Central Chile (33°50'S) Andean Geology, Vol
Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Muñoz, Marcia; Fuentes, Francisco; Vergara, Mario; Aguirre, Luis; Olov Nyström, Jan; Féraud, Gilbert; Demant, Alain Abanico East Formation: petrology and geochemistry of volcanic rocks behind the Cenozoic arc front in the Andean Cordillera, central Chile (33°50'S) Andean Geology, vol. 33, núm. 1, enero, 2006, pp. 109-140 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173918422005 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Abanico East Formation: petrology and geochemistry of volcanic rocks behind the Cenozoic arc front in the Andean Cordillera, central Chile (33°50'S) Marcia Muñoz Departamento de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile [email protected] Francisco Fuentes [email protected] Mario Vergara [email protected] Luis Aguirre [email protected] Jan Olov Nyström Swedish Museum of Natural History, SE-10405 Stockholm, Sweden [email protected] Gilbert Féraud UMR Géosciences Azur, CNRS-UNSA, Université de Nice- Sophia Antipolis, 06108 Nice Cedex 02, France [email protected] Alain Demant Laboratoire de Pétrologie Magmatique Université Aix-Marseille III, 13397 Marseille Cedex 20, France [email protected] ABSTRACT The stratigraphy, chemistry and age of rocks assigned to the eastern portion of the Abanico Formation exposed along the El Volcán river valley, Principal Cordillera east of Santiago (30º50'S/70º12'-70º5'W), are reported and discussed. -
Southward-Directed Subduction of the Farallon–Aluk Spreading Ridge and Its Impact on Subduction Mechanics and Andean Arc Magmatism: Insights From
feart-08-00121 May 7, 2020 Time: 11:30 # 1 ORIGINAL RESEARCH published: 08 May 2020 doi: 10.3389/feart.2020.00121 Southward-Directed Subduction of the Farallon–Aluk Spreading Ridge and Its Impact on Subduction Mechanics and Andean Arc Magmatism: Insights From Edited by: Marina Manea, Geochemical and Seismic National Autonomous University of Mexico, Mexico Tomographic Data Reviewed by: 1,2 1,2 1,2 1,2 Luca Ferrari, Sofía B. Iannelli *, Lucía Fernández Paz , Vanesa D. Litvak , Guido Gianni , Geosciences Center, National Lucas M. Fennell1,2, Javiera González3, Friedrich Lucassen4, Simone Kasemann4, Autonomous University of Mexico, Verónica Oliveros3 and Andrés Folguera1,2 Mexico 1 2 Jiashun Hu, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Buenos Aires, Argentina, Instituto de Estudios 3 California Institute of Technology, Andinos ‘Don Pablo Groeber’, CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina, Departamento 4 United States de Ciencias de la Tierra, Universidad de Concepción, Concepción, Chile, MARUM - Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, Germany *Correspondence: Sofía B. Iannelli sofi[email protected] Since the initial proposal of the past existence of a southward-directed mid-ocean ridge–subduction interaction in the Andes during Late Cretaceous–Paleogene times, Specialty section: This article was submitted to several studies have been devoted to uncover the tectonomagmatic evidence of this Structural Geology and Tectonics, process. The collision of a spreading ridge against a subduction margin provokes a section of the journal important tectonomagmatic changes, including, between them, variations in arc-related Frontiers in Earth Science magmatic activity and in the plate-margin stress regime. -
Exhumation and Uplift of the Western Main Cordillera Between 33° and 34°5
6th International Symposium on Andean Geodynamics (ISAG 2005, Barcelona), Extended Abstracts: 273-276 Exhumation and uplift of the western Main Cordillera between 33° and 34°5 Andrés Fock" Reynaldo Charrier 2, Marcelo Fadas 3, Victor Maksaev 4, Mark Fanning 5, & Pamela Alvarez 6 1 Departamento de Geologia, Universidad de Chile, Santiago, Chile ([email protected]); 2 Departamento de Geologia, Universidad de Chile, Santiago, Chile ([email protected]); 3 Departamento de Geologia, Universidad de Chile, Santiago, Chile, and LMTG-IRD, Université Paul Sabatier, Toulouse, France ([email protected]); 4 Departamento de Geologia, Universidad de Chile, Santiago, Chile ([email protected]); 5 Research School of Earth Sciences, Australian National University, Camberra, Australia ([email protected]); 6 SIPETROL, Santiago, Chile ([email protected]) KEYWORDS: Central Chile, Andes, Apatite fission-track ages, Neogene mountain building INTRODUCTION ln this paper we discuss the control of major structures in the exhumation of Cenozoic rocks and surface uplift in the Andean Main Cordillera based on new apatite fission tracks age analysis and the study of geological cross -sections. Fig. 1: Principal morphostructural Units. The box shows de Study Region The study area is segmented in the following N-S oriented morphostructural units (Fig. 1), from west to east: Coastal Cordillera, Central Depression, Western and Eastern Main Cordil1era (WMC and EMC, respectively), and Frontal Cordillera. The Coastal Cordillera consists mainly of volcanic and sedirnentary Mesozoic rocks, the Aptian - Albian Las Chilcas and Maastrichtian La Valle formations and Late Mesozoic intrusive bodies (Sellés and Gana, 2001), which are in contact with Cenozoic rocks through west vergent thrust faults located in the Central Depression and the western border of the WMC. -
ANDES NEAR SANTIAGO BIRDS of CENTRAL CHILE Full Day
THE ANDES NEAR SANTIAGO BIRDS OF CENTRAL CHILE Full day Our destination is the Andean range near the city of Santiago de Chile, the capital and largest city of the country. During this tour, we'll explore the Natural Sanctuary of Yerba Loca. Then, we'll continue going higher up to reach the areas of Farellones and Valle Nevado. This is the perfect spot to look for two hummingbirds of Central Chile: White-sided Hillstar and the Giant Hummingbird as some other specialties and endemics as the Chilean Tinamou, Crag Chilia, Tapaculo, Mustached Turca and the Andean Condor. While we ascend to higher altitude we will spot different species of Ground-Tyrants and Miners. TARGET: 40 SPECIES Some of the species that can be found in this trip: Giant Hummingbird, White-sided Hillstar, Chilean Tinamou, California Quail, Spot-billed Ground Tyrant, White-browed Ground Tyrant, Cinerous Ground-tyrant, Great-shrike Tyrant, Grey-hooded Sierra Finch, Band-tailed Sierra Finch, Scale-throated Earthcreeper, Rufous-banded Miner, Creamy- rumped Miner, Burrowing Owl, Magellanic Horned Owl. Destinations Farellones, Valle Nevado and Yerba Loca Sanctuary Departure Santiago LenGth Full day Difficulty Low, we could reach over 2.000 mts / 6.500 ft a.s.l. Activities Bird watchinG Photo opportunity Soft walk Meals Box lunch (veGetarian, veGan and Gluten intolerant options available upon request) Accommodations Not included Transportation Professional Driver with license A2, modern vehicles, window seat Guaranteed for each traveller, private terrestrial transportation Insurances Metlife coverage for each traveller between 18 and 64 years old Equipment provided Literature, field guide, birds check list, spottinG scope. -
LEYENDA Río VALPARAÍSO Terrenos Hortícolas TILTIL a L I N C O Huertos Frutales
o n c a g u a Rí o A c Bahía de Valparaíso NN LEYENDA Río VALPARAÍSO Terrenos Hortícolas TILTIL a l i n C o Huertos Frutales . PEÑUELAS COLINA t E s Terrenos con o c Culivos Extensivos s C i st. as c E ab n l a Todas las Praderas an r ca F e n Naturales o Artificiales LAMPA a u S g o n í CASA BLANCA a R Terrenos de Bosques u ho P apoc a . M n t o i í í o o l ALGARROBO s R R M E LO BARNECHEA Terrenos Húmedos EL QUISCO CURACAVI Terrenos sin Uso EL TABO SANTIAGO e a d o P u a n g u l o r MAIPU C o Areas Urbanas Bahía Cartagena . í o t MARIA PINTO R Insertas en el Area CARTAGENA s o E h LA FLORIDA c de Proyecto Est o SAN SAN ANTONIO . La H p iguera a BERNARDO PUENTE ALTO Areas Urbanas con M PEÑAFLOR R Origen en Loteos o í í o Agrícolas Destinadas R TALAGANTE PIRQUE SAN JOSEDEMAIPO M SANTO DOMINGO Río A Parcelas de Agrado EL MONTE o Cl a MELIPILLA p ar i R i ill p Areas Urbanas Gran a o o oí M A Santiago Año 1981 o IN í T M ISLA DEMAIPO R BUIN N a i E p o G Areas Urbanas Gran AR Santiago Año 1997 Es PAINE t . Y R a í l i o A n SAN PEDRO g o s t u R í r o a M a ip o R MOSTAZAL ío R u e Fig. -
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Index Page numbers in italic denote Figures. Page numbers in bold denote Tables. Abanico extensional basin 2, 4, 68, 70, 71, 72, 420 Andacollo Group 132, 133, 134 basin width analogue modelling 4, 84, 95, 99 Andean margin Abanico Formation 39, 40, 71, 163 kinematic model 67–68 accommodation systems tracts 226, 227, 228, 234, thermomechanical model 65, 67 235, 237 Andean Orogen accretionary prism, Choapa Metamorphic Complex development 1, 3 20–21, 25 deformation 1, 3, 4 Aconcagua fold and thrust belt 18, 41, 69, 70, 72, 96, tectonic and surface processes 1, 3 97–98 elevation 3 deformation 74, 76 geodynamics and evolution 3–5 out-of-sequence structures 99–100 tectonic cycles 13–43 Aconcagua mountain 3, 40, 348, 349 uplift and erosion 7–8 landslides 7, 331, 332, 333, 346–365 Andean tectonic cycle 14,29–43 as source of hummocky deposits 360–362 Cretaceous 32–36 TCN 36Cl dating 363 early period 30–35 aeolian deposits, Frontal Cordillera piedmont 299, Jurassic 29–32 302–303 late period 35–43 Aetostreon 206, 207, 209, 212 andesite aggradation 226, 227, 234, 236 Agrio Formation 205, 206, 207, 209, 210 cycles, Frontal Cordillera piedmont 296–300 Chachahue´n Group 214 Agrio fold and thrust belt 215, 216 Neuque´n Basin 161, 162 Agrio Formation 133, 134, 147–148, 203, Angualasto Group 20, 22, 23 205–213, 206 apatite ammonoids 205, 206–211 fission track dating 40, 71, 396, 438 stratigraphy 33, 205–211 (U–Th)/He thermochronology 40, 75, 387–397 Agua de la Mula Member 133, 134, 205, 211, 213 Ar/Ar age Agua de los Burros Fault 424, 435 Abanico Formation -
Paleogene Pseudoglyptodont Xenarthrans from Central Chile and Argentine Patagonia
PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK, NY 10024 Number 3536, 18 pp., 4 figures October 19, 2006 Paleogene Pseudoglyptodont Xenarthrans from Central Chile and Argentine Patagonia 1 2 3 MALCOLM C. MCKENNA, ANDRE´ R. WYSS, AND JOHN J. FLYNN ABSTRACT Herein we describe a new, large-bodied species of Pseudoglyptodon, a close sloth ally, from volcaniclastic deposits of the Abanico (5 Coya-Machalı´) Formation of the central Chilean Andean Main Range. This species, P. chilensis, is a rare element of the Tinguiririca Fauna, on which the recently formalized Tinguirirican South American Land Mammal ‘‘Age’’ is founded, being known from just two specimens. The holotype of P. chilensis, a partial skull and largely complete mandibles (preserving seemingly complete upper and lower dentitions), is by far the best-preserved specimen referable to Pseudoglyptodon known. As such, this material permits a more refined phylogenetic placement of this enigmatic xenarthran than has been possible previously, with Pseudoglyptodon representing the proximal outgroup to the clade including the most recent common ancestor of Choelepus and Bradypus, plus all its descendants (i.e., crown clade sloths). A fragmentary specimen from Argentina is removed from Glyptatelus and referred to Pseudoglyptodon. Although this specimen is distinct from P. chilensis and other previously recognized species of Pseudoglyptodon, it offers too meager a basis for formally establishing a new name. Finally, phylogenetic definitions of the names Phyllophaga and Tardigrada are proposed. Historically these terms have been used largely interchangeably, but here we advocate linking the latter to the crown clade. 1 Division of Paleontology, American Museum of Natural History ([email protected]). -
Petrology and Geochemistry of Volcanic Rocks Behind the Cenozoic Arc Front in the Andean Cordillera, Central Chile (33°50'S)
Abanico East Formation: petrology and geochemistry of volcanic rocks behind the Cenozoic arc front in the Andean Cordillera, central Chile (33°50'S) Marcia Muñoz1, Francisco Fuentes1, Mario Vergara1, Luis Aguirre1, Jan Olov Nyström2, Gilbert Féraud3, Alain Demant4 1 Departamento de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile. [email protected] , [email protected] , [email protected] , [email protected] 2 Swedish Museum of Natural History, SE-10405 Stockholm, Sweden. [email protected] 3 UMR Géosciences Azur, CNRS-UNSA, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 02, France. [email protected] 4 Laboratoire de Pétrologie Magmatique Université Aix-Marseille III, 13397 Marseille Cedex 20, France. [email protected] ABSTRACT The stratigraphy, chemistry and age of rocks assigned to the eastern portion of the Abanico Formation exposed along the El Volcán river valley, Principal Cordillera east of Santiago (30º50'S/70º12'-70º5'W), are reported and discussed. This ca. 3,300 m thick succession is mainly composed of basalts, basaltic andesites and volcaniclastic rocks. 40Ar/39Ar radiometric dates on plagioclase from the lava flows yield Oligocene-lower Miocene ages with a maximum age of 34.3 ±0.4 Ma for the lower part and a plateau age of 21.4±1.0 Ma for the upper part of the succession. The lava flows show calc-alkaline affinities and have chemical characteristics that are typical of arc volcanic rocks erupted in an active continental margin. A temporal chemical evolution in the sequence is indicated by upward increases in concentrations of LILE and LREE elements and LaN/YbN ratios. -
Minerals-09-00550-V2.Pdf
minerals Article Implications of Hf Isotopes for the Evolution of the Mantle Source of Magmas Associated with the Giant El Teniente Cu-Mo Megabreccia Deposit, Central Chile Charles R. Stern 1,* , Kwan-Nang Pang 2, Hao-Yang Lee 2, M. Alexandra Skewes 1 and Alejandra Arévalo 3 1 Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0399, USA; [email protected] 2 Institute of Earth Sciences, Academia Sinica, Taipei City 115, Taiwan; [email protected] (K.-N.P.); [email protected] (H.-Y.L.) 3 Escuela de Ingeniería, Universidad de O’Higgins, VI Región 2910000, Chile; [email protected] * Correspondence: [email protected]; Tel.: +1-303-492-7170 Received: 27 July 2019; Accepted: 10 September 2019; Published: 12 September 2019 Abstract: We have determined the Hf isotopic compositions of 12 samples associated with the giant El Teniente Cu-Mo megabreccia deposit, central Chile. The samples range in age from 8.9 to 2.3 Ma and ≥ provide information about the temporal evolution of their magmatic sources from the Late Miocene to Pliocene. Together with previously published data, the new analysis indicates a temporal decrease of 10 "Hf(t) units, from +11.6 down to +1.6, in the 12.7 m.y. from 15 to 2.3 Ma. These variations imply increasing incorporation of continental crust through time in the magmas that formed these rocks. The fact that the samples include mantle-derived olivine basalts and olivine lamprophyres suggests that these continental components were incorporated into their mantle source, and not by intra-crustal contamination (MASH). -
Redalyc.Influence of Depositional Load on the Development of a Shortcut
Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Muñoz-Sáez, Carolina; Pinto, Luisa; Charrier, Reynaldo; Nalpas, Thierry Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene Oligocene Abanico Basin case, central Chile Andes (33°-35°S) Andean Geology, vol. 41, núm. 1, enero-, 2014, pp. 1-28 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173929668001 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Andean Geology 41 (1): 1-28. January, 2014 Andean Geology doi: 10.5027/andgeoV41n1-a01 formerly Revista Geológica de Chile www.andeangeology.cl Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S) Carolina Muñoz-Sáez1, 5, *Luisa Pinto1, 2, Reynaldo Charrier1, 2, 3, Thierry Nalpas4 1 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Casilla 13518, Correo 21, Santiago, Chile. [email protected] 2 Advanced Mining Technology Center (AMTC), Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beauchef 850, Santiago. 3 Escuela de Ciencias de la Tierra, Universidad Andrés Bello, Campus República, República 230, Santiago. [email protected] 4 Géosciences Rennes, UMR CNRS 6118-Université de Rennes 1, Campus Beaulieu, 263 Avenue du General Leclerc, 35042 Rennes Cedex, France. -
Entidades Rurales Aisladas De La Región Metropolitana De Santiago De Chile - Rms: Localización Y Vulnerabilidad*
Entidades rurales aisladas de la Región Metropolitana de Santiago de Chile - RMS: localización y vulnerabilidad* Entidades rurais isoladas da Região Metropolitana de Santiago do Chile (Chile): localização e vulnerabilidade Isolated Rural Entities of the Metropolitan Area of Santiago, Chile: Localization and Vulnerability Gerardo Ubilla Bravo** Gobierno Regional Metropolitano de Santiago y Universidad de Chile, Chile Resumen Resumo Abstract En la Región Metropolitana de Santiago Na Região Metropolitana de Santiago Among the small rural human se encuentran pequeños asentamientos do Chile se encontram pequenos settlements found in the Metropolitan humanos rurales, entre los cuales assentamentos humanos rurais, entre Area of Santiago, there are some that existen entidades rurales en condiciones os quais existem entidades rurais show a greater physical isolation due de mayor aislamiento físico, debido em condições de maior isolamento to a series of geographical factors a una serie de factores geográficos. físico, devido a uma série de fatores and that are generally excluded from Estos generalmente se encuentran al geográficos. Estes geralmente se most public and private investment margen de la mayoría de las políticas encontram à margem da maioria das policies. The objectives of this research públicas e inversión privada. La presente políticas públicas e investimento project are the following: identify the investigación tiene por objetivos: privado. A presente pesquisa tem por most isolated rural entities; determine determinar las entidades rurales con objetivos: determinar as entidades their vulnerability; and propose initial mayor grado de aislamiento, identificar rurais com maior grau de isolamento, territorial development objectives la vulnerabilidad de dichas entidades identificar a vulnerabilidade de tais by applying a physical-geographical y realizar una propuesta inicial de entidades e realizar uma proposta isolation index, an interview, and objetivos de desarrollo territorial, inicial de objetivos de desenvolvimento a logical framework method. -
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CHILE WEEKLY REPORT COVID-19 27 JULY, 2020 18.583 ACTIVE CASES 2.198 NEW CASES 449 ASYMPTOMATIC 9.112 DEATHS 1.295 HOSPITALIZED PATIENTS 239 IN CRITICAL CONDITIONS 1.524.553 TOTAL PCR EXAMS PERFORMED NUMBERS 19.709 TOTAL PCR EXAMS PERFORMED IN THE LAST 24 HOURS LOCATIONS IN QUARANTINE ARICA Y PARINACOTA ANTOFAGASTA METROPOLITANAPeñaflor Arica Calama 32 comunas de la Melipilla Tocopilla Provincia de Curacaví Mejillones Santiago Tiltil Antofagasta San Bernardo San José de Maipo Buin Calera de Tango Puente Alto El Monte Padre Hurtado Peñaflor Lampa Talagante Colina TARAPACÁ Iquique VALPARAÍSO Alto Hospicio DEL LIBERTADOR Pozo al Monte San Antonio DEL MAULE Viña del Mar GENERAL BERNARDO Curicó Valparaíso O`HIGGINS Quillota Rancagua Los Andes Machalí San Felipe Graneros Rengo LATEST MEASURES • The Ministry of Health announced that the communes of Coquimbo, La Serena and Puerto Montt will enter quarantine as of Wednesday, July 29, at 10:00 p.m. • New cases decreased by 5% and positivity has remained at 12%, despite which the Undersecretary of Public Health, Paula Daza, reinforced the call for self-care and citizen responsibility. • The Minister of National Assets, Julio Isamit, together with the Undersecretary of Public Health, Paula Daza, and the Undersecretary of Assistance Networks, Arturo Zuñiga, announced today that the Covid-19 Territorial Viewer will include the implementation of the Step-by-Step Plan announced by the Government. • The Minister of Health, Enrique Paris, confirmed the trend towards a decrease in the indicators of the coronavirus pandemic in the country. The authority highlighted that "we have had a decrease of 11% of new cases in the last seven days and 29% in the last 14 days”.