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Late Quaternary Morphodynamics in the Quebrada De Purmamarca, NW Argentina
Quaternary Science Journal GEOZON SCIENCE MEDIA Volume 59 / Number 1–2 / 2010 / 21–35 / DOI 10.3285/eg.59.1-2.02 ISSN 0424-7116 E&G www.quaternary-science.net Late Quaternary morphodynamics in the Quebrada de Purmamarca, NW Argentina Jan-Hendrik May, Ramiro Daniel Soler Abstract: � This study aims to document the geomorphic, sedimentary and paleopedogenic archives in the Quebrada de Purmamarca.The paleoenvironmental interpretation of these archives and the reconstruction of landscape evolution are mainly based on field observations and geomorphological mapping (May 2008). A series of aggradational terraces mostly consisting of coarse debris- flow deposits are the main focus of this investigation. While the associated cut-and-fill processes are probably the result of an interplay between climatic and tectonic controls, the deposition of the youngest terrace level (> 150 m thickness) may likely be attributed to a drop of the periglacial belt of more than 1000 meters below its modern elevation. For the time after terraceac- cumulation has ceased, the interpretation of alluvial fans, aeolian sand and a well-developed paleosol points to Late Quaternary humidity changes as an important control on landscape evolution. The major phase of downcutting and incision significantly postdates the end of terrace deposition and may have been triggered by markedly increased amounts of monsoonal precipita- tion. Finally, minor humidity changes of possible Holocene age are indicated by paleopedogenic and geomorphic observations on terrace surfaces and along valley slopes. (Spätquartäre Morphodynamik in der Quebrada de Purmamarca, NW Argentina) Kurzfassung: Ziel dieser Arbeit ist die Dokumentation geomorphologischer, sedimentärer und paläopedologischer Archive in der Quebrada de Purmamarca. -
Presentación De Powerpoint
S11D-0385: Three major faults in northeastern Colombia (Sierra Nevada de Santa Marta & Perija Range): seismotectonic model and scope of its seismic hazard Germán Chicangana 1, Andreas Kammer 2, Hector Mora - Páez 3, Carlos Alberto Vargas 2, Augusto Gómez - Capera 4. 1. Universidad Santo Tomas, Villavicencio, Colombia. 2. Universidad Nacional de Colombia, Bogotá D.C., Colombia. 3. Servicio Geológico Colombiano, Bogotá D.C., Colombia. 4..Istituto Nazionale di Geofísica e Vulcanologia, Milano, Italy. ABSTRACT 2. REGIONAL GEOLOGY 3. HISTORICAL EARTHQUAKE In the northeasternCORO Colombia, the northernmost foothills of the Andes are present, whose representatives are 1. LOCATION the Sierra Nevada de Santa Marta (SNSM) and the Perija Range. This orogenic system is delimited by three major faults that limit three large basins. In its order from west to east are the Santa Marta Fault that limits the Sierra Nevada de Santa Marta with the Lower Magdalena Basin. The Oca Fault that limits with the low basin of the Rancheria River to the north in the south of Guajira Peninsula, and toward the east the Perija – El Tigre Fault that limits with the Maracaibo Basin. Each of these faults have a great size. Since 2008, when the National Seismological Network of Colombia (RSNC) increased its number of seismological stations in this region of Colombia, the recording of surface seismicity that is associated with the tectonic mobility of this orogenic system began. The strong earthquakes in this region do not exceed in magnitude M = 5.5, emphasizing earthquakes with M ≈ 4.5 in average. The origin of the tectonic mobility of this orogenic system obeys to the convergence between the Caribbean Plate and the northwestern corner of South America. -
This Article Appeared in a Journal Published by Elsevier. the Attached
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy Palaeogeography, Palaeoclimatology, Palaeoecology 280 (2009) 480–488 Contents lists available at ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Early Miocene subtropical water temperatures in the southeast Pacific Sven N. Nielsen ⁎,1, Johannes Glodny Deutsches GeoForschungsZentrum (GFZ), Telegrafenberg, 14473 Potsdam, Germany article info abstract Article history: Cenozoic climate of western South America is strongly controlled by features like Andean uplift and the Received 14 May 2009 Humboldt Current. The first strontium isotope age data from central and southern Chile provide a latest Accepted 24 June 2009 Oligocene to late early Miocene age for classic warm-water mollusk faunas reaching as far south as 45°S. Available online 3 July 2009 Comparison with the biogeography of congeneric living species indicates that sea surface temperatures off central and southern Chile during that time were at least 5 °C higher than today; i.e., minimum annual mean Keywords: sea surface temperatures for Darwin's Navidad fauna at 34°S are estimated as 20 °C. -
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. -
Structure, Petrography and Geochemistry EARTH SCIENCES
EARTH SCIENCES RESEARCH JOURNAL GEOLOGY Earth Sci. Res. J. Vol. 24, No. 2 (June, 2020): 121-132 The Choiyoi Group in the Cordón del Plata range, western Argentina: structure, petrography and geochemistry Amancay Martinez1, Adrian Gallardo1,2, Laura Giambiagi3, Laura Tobares1 1San Luis National University, FCFMyN, Department of Geology, San Luis, Argentina 2CONICET (Argentina National Scientific and Technical Research Council), San Luis, Argentina. 3IANIGLA-CONICET CCT Mendoza. Adrián Ruiz Leal s/n, Parque San Martín. (5500). Mendoza, Argentina. * Corresponding author: [email protected] ABSTRACT Keywords: Choiyoi Group; magmatism; petrography; The Choiyoi Group from the Permo-Triassic, is one of the most conspicuous volcano-sedimentary suites of southern geochemistry; Gondwana; Argentina. South America, considered critical to understand the geological evolution of the western margins of Gondwana. In this regard, petrography, geochemistry, and structural data were examined to better elucidate the physical character and emplacement conditions of the unit in the Cordón del Plata range, within the Frontal Cordillera of Mendoza, Argentina. The site is representative of the magmatism and deformation through different Andean cycles. Results of the study indicate three facies of increasing felsic composition upwards. Mafic units consist of basalts, andesite and andesitic breccias at the base of the sequence. Felsic rocks such as rhyodacites, granites and welded tuffs are predominant above. The fault zone of La Polcura – La Manga is the most prominent structural feature in the region, which presumably controlled the emplacement of breccias and ignimbrites within the middle and upper members. These compositional variations suggest a magma evolution from subduction to a rifting environment after the San Rafael orogeny in the Late Palaeozoic. -
This Article Appeared in a Journal Published by Elsevier. the Attached Copy Is Furnished to the Author for Internal Non-Commerci
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy Gondwana Research 20 (2011) 782–797 Contents lists available at ScienceDirect Gondwana Research journal homepage: www.elsevier.com/locate/gr Paleomagnetism and rock magnetism of the Neoproterozoic Itajaí Basin of the Rio de la Plata craton (Brazil): Cambrian to Cretaceous widespread remagnetizations of South America E. Font a,⁎, C.F. Ponte Neto b,1, M. Ernesto b a Instituo Dom Luiz, Universidade de Lisboa, Campo Grande,1749-016, Lisbon, Portugal b Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, Brazil article info abstract Article history: A detailed rock magnetic and paleomagnetic study was performed on samples from the Neoproterozoic Itajaí Received 8 July 2010 Basin in the state of Santa Catarina, Brazil, in order to better constrain the paleogeographic evolution of the Rio Received in revised form 27 April 2011 de la Plata craton between 600 and 550 Ma. However, rock magnetic properties typical of remagnetized rocks Accepted 28 April 2011 and negative response in the fold test indicated that these rocks carried a secondary chemical remanent Available online 6 May 2011 magnetization. -
Discusión Estratigráfica De Las Formaciones Quiriquina, Pilpílco, Curanilahue, Cosmito Y Cerro Alto De La Provincia De Concepción Y Norte De La Provincia De Arauco
UNIVERSIDAD DE CONCEPCIÓN FACULTAD DE CIENCIAS QUÍMICAS DEPARTAMENTO CIENCIAS DE LA TIERRA DISCUSIÓN ESTRATIGRÁFICA DE LAS FORMACIONES QUIRIQUINA, PILPÍLCO, CURANILAHUE, COSMITO Y CERRO ALTO DE LA PROVINCIA DE CONCEPCIÓN Y NORTE DE LA PROVINCIA DE ARAUCO. REGIÓN DEL BIOBÍO, CHILE Memoria para optar al Título de Geólogo Alex Danitt Inostroza Amigo Profesor Patrocinante: Sr. Ramiro Ulises Bonilla Parra Profesores Comisión: Msc. Abraham Elías González Martínez Dr. Luis Arturo Quinzio Sinn Concepción, 2018 ÍNDICE Página RESUMEN 1. INTRODUCCIÓN ............................................................................ 1 1.1. OBJETIVOS .…............................................................................................ 1 1.1.1. Objetivo General ….….…………………..…………….................... 1 1.1.1. Objetivos Específicos …...……………..……………….................... 1 1.2. UBICACIÓN ÁREA DE ESTUDIO ...……….…………………………… 2 1.3. TRABAJOS ANTERIORES ………...……………………………………. 3 1.4. METODOLOGÍA …………………………………………………...…….. 6 1.5. CLIMA, FLORA Y FAUNA ……..……………………………………….. 6 1.6. AGRADECIMIENTOS ……………………………...……………………. 9 2. MARCO GEOLÓGICO ……………………..……………………..……. 10 2.1. ROCAS METAMÓRFICAS ...……………………………..……………... 10 2.1.1. Edad del protolito ……….…………………..………….................... 11 2.2. ROCAS INTRUSIVAS ……………………………..…………...………... 12 2.3. ROCAS ESTRATIFICADAS ……………………………..……...………. 13 2.3. 1. Formación Quiriquina ………………………..…………................ 13 2.3. 2. Formación Pilpílco ………………………..…………..................... 14 2.3. 3. Formación Curanilahue ………………………….………….……. -
Guía Geoturística Y Patrimonial GMLDB
2018 ÍNDICE. CONTENTS. PROYECTO INTRODUCCIÓN. INTRODUCTION. El proyecto Geoparque Minero Litoral del Biobío, pretende ser un referente a nivel nacional, con el reconocimiento que otorga la UNESCO, bajo el programa oficial, Geoparques Mundiales de la UNESCO, al promover la preservación del patrimonio geológico, histórico y cultural presente en el litoral del Biobío, mediante el desarrollo turístico sustentable, la educación y generando un vínculo de compromiso, respeto y conservación entre la comunidad y su entorno. The Geoparque Minero Litoral del Biobío project aims to be a benchmark at the national level, with the recognition granted by UNESCO, under the official program, UNESCO Global Geoparks, to promote the preservation of the geological, historical and cultural heritage present in the coastal Biobío region, through sustainable tourism, development, education and generating a bond of commitment, respect and conservation between the community and its environment. Interior de la mina Chiflón del Diablo (Lota). 9 HISTORIA. HISTORY. El proyecto Geoparque Minero Litoral del Biobío, surge a través de la detección sobre la necesidad y voluntad del territorio, en desarrollarse en materia turística y económica, mediante la puesta en valor de su patrimonio geológico, histórico y cultural, enfocado en gran parte en la historia de la minería del carbón. En 2016, la Universidad Católica de la Santísima Concepción (de ahora en adelante UCSC), se adjudica un concurso de Bienes Públicos Estratégicos Regionales con financiamiento de la Corporación de Fomento de la Producción (CORFO). Es de esta forma como la UCSC en conjunto con SERNATUR, el Ministerio de Minería, Corparauco, el CFT Lota-Arauco y la colaboración de la Universidad de Concepción, Universidad Andrés Bello, Municipalidades y comunidad en general, da comienzo a la puesta en marcha del proyecto a largo plazo, con la misión de cumplir con los requerimientos solicitados por la UNESCO, para poder ser reconocido como Geoparque Mundial de la UNESCO. -
Evidence for an Early-Middle Miocene Age of the Navidad Formation (Central Chile): Paleontological, Climatic and Tectonic Implications’ of Gutiérrez Et Al
Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Le Roux, Jacobus P.; Gutiérrez, Néstor M.; Hinojosa, Luis F.; Pedroza, Viviana; Becerra, Juan Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78) Andean Geology, vol. 41, núm. 3, septiembre, 2014, pp. 657-669 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173932124008 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 (3): 657-669. September, 2014 Andean Geology doi: 10.5027/andgeoV41n3-a0810.5027/andgeoV40n2-a?? formerly Revista Geológica de Chile www.andeangeology.cl REPLY TO COMMENT Reply to Comment of Encinas et al. (2014) on: ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, climatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78) Jacobus P. Le Roux1, Néstor M. Gutiérrez1, Luis F. Hinojosa2, Viviana Pedroza1, Juan Becerra1 1 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile-Centro de Excelencia en Geotermia de los Andes, Plaza Ercilla 803, Santiago, Chile. [email protected]; [email protected]; [email protected]; [email protected] 2 Laboratorio de Paleoecología, Facultad de Ciencias-Instituto de Ecología y Biodiversidad (IEB), Universidad de Chile, Las Palmeras 3425, Santiago, Chile. -
A Pliocene Mega-Tsunami Deposit and Associated Features in the Ranquil Formation, Southern Chile ⁎ J.P
A Pliocene mega-tsunami deposit and associated features in the Ranquil Formation, southern Chile ⁎ J.P. Le Roux a, , Sven N. Nielsen b,1, Helga Kemnitz b, Álvaro Henriquez a a Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile b GeoForschungsZentrum Potsdam, Section 3.1, Telegrafenberg, 14473 Potsdam, Germany Abstract An exceptionally large tsunami affected the coastline of southern Chile during the Pliocene. Its backflow eroded coarse beach and coastal dune sediments and redistributed them over the continental shelf and slope. Sandstone dykes and sills injected from the base of the resulting hyperconcentrated flow into underlying cohesive muds, assisted in plucking up large blocks of the latter and incorporating them into the flow. Locally, the rip-up intraclasts were fragmented further by smaller-scale injections to form a distinct breccia of angular to rounded mudstone clasts within a medium to coarse sandstone matrix. Sandstone sills in places mimic normal sedimentary beds, complete with structures resembling inverse gradation, planar laminae, as well as ripple and trough cross-lamination. These were probably formed by internal sediment flow and shear stress as the semi-liquefied sand was forcefully injected into cracks. In borehole cores, such sills can easily be misinterpreted as normal sedimentary beds, which can have important implications for hydrocarbon exploration. Keywords: Tsunami; Sandstone dykes; Debris flow; Mimic sedimentary structures; Eltanin impact; Hydrocarbon reservoirs 1. Introduction associated sedimentological features including large rip-up clasts and well rounded basement boulders incorporated in- The west coast of South America has a narrow shelf and to the debris, as well as sand injection from the base of the steep continental slope into a deep subduction trench.