DOCSLIB.ORG

PDF Linkchapter

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

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 71 Agua Dulce Metaturbidites 21, 23–24 Barreal-Las Pen˜as Deformation Zone 277, 279, 286 Agua Las Mun˜eras Creek 248, 254, 255, 261 Don˜a Ana Group 110 Agua Salada Volcanic Complex 32 Neogene pediplains 431, 432, 434, 437 Airy- Keiskanen compensation model 170, 171, 176, Rı´o La Sal Formation 111 177, 193 Valle del Cura Formation 111, 113, 115–117 Ajial Formation 31 Arboles megalandslide 334 Alfalfal debris flow 338 arc magmatism Algarrobal Formation 27, 34 Andean tectonic cycle 30, 31, 40–43, 42 Algarrobillo Pediplain 426, 428, 429, 430, 431–433 Gondwanian tectonic cycles 21–22 geochronology 434, 435, 436–437 retroarc 22 incision 440 basin deposits 22–23 uplift 438–439 western Sierras Pampeanas 19, 20 alluvial fans 5, 38, 249, 274, 278, 279 Argentina, central western Frontal Cordillera piedmont 296–300, 302–304 geographical features 369–370 see also Regional Aggradational Plain (RAP) seismicity 369, 371–380, 372 Almacenes lateral moraine 354, 355 ground effects 377, 379 Alojamiento Fault 273, 274, 275, 277 historical records 373, 374–375, 376, 377 Alto del Tigre High 28,32 seismic hazard 370, 379 Alto Tunuya´n basin 72–73, 74, 75 tectonic setting 370–371 Altos de Hualmapu Formation 31, 33 Arqueros Formation 32, 33, 34 Altos de Talinay Plutonic Complex 29 Arraya´n Formation 21, 23, 24 Alvarado depocentre 32 Arroyo Anchayuyo, alluvial fans 296, 297 Amarillo rockslide 334, 335, 336 Arroyo del Zancarro´n 115, 116 ammonoids, Agrio Formation 205, 206–211 Arroyo Guanaco Zonzo 117, 120 Amphidonte 206, 207, 208, 209 Arroyo Malo Formation 32 analogue modelling Arroyo Yaucha, fill terraces 299, 303, 304 basin width and tectonic inversion 84–87 Asociacio´n Pirocla´stica Pumı´cea (APP) 285, 296, 297, comparison with natural basins 95–102 298, 300, 304, 305, 315 results 87–95 Atacama Gravels 423 Anchayuyo fault 69, 75, 319, 321–322 Auquilco Formation 31, 32, 33 seismic potential 321–322 Austral Basin, U–Pb zircon dating 149 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3920030/9781862396753_backmatter.pdf by guest on 26 September 2021 448 INDEX avalanches see rock avalanche deposits Cambrian Avile´ Member lowstand wedge 205 Famatinian tectonic cycle 17 U–Pb zircon dating 147–148 Pampean tectonic cycle 14,15 Azufrera-Torta surface 437 Campanario Formation 40 Can˜on del Atuel landslide 339 backarc basins Cantarito Gravels 437 Andean tectonic cycle 4, 30, 31, 34–35 Capdeville Anticline 273 inversion 69, 71 Caracol basin 228, 230, 237 Bajada del Agrio Group 37, 133, 134 Caracol Range, uplift 239, 241 Ban˜os Colorados creek thrust section 248, 252, 259, 273, carbonates, Cuyo Precordillera 17, 19 274, 278 Carboniferous, Gondwanian tectonic cycles 22–23, Ban˜os del Flaco Formation 31, 35 24, 25 Barrancas Anticline 320 Carri Lauquen Lake failure 340 1985 earthquake 375, 376, 377 Carrizalito Tonalite 17 Barrancas-Lunlunta fault, seismic potential 322 Casleo Formation 279–282 Barreal Block 280, 281 Caucete 1941 earthquake 373, 375 Barreal Fault 274, 279, 280 Caucete 1977 earthquake 373, 375, 377, 379 Barreal-Las Pen˜as Deformation Zone 5, 269, 271, 273, Caucete Group 19 274–284 Cavilole´n unit 31 earthquakes 282 Cenozoic fault scarps 279 Andean tectonic cycle 36–43 Late Cenozoic kinematics 275–276 Barreal-Las Pen˜as Deformation Zone Late Cenozoic tectonics ages 276–282 kinematics 275–276 palaeoseismological records 278–282 tectonic ages 276–282 Quaternary deformation and relief construction Central Depression 15, 16, 38, 70, 73,76 282–284 geological setting 65 Quaternary faults 272, 274–275 Cerrilladas Pedemontanas thrust belt 269, 270, 272, structural highs 283–284 311, 314 uplift 283 geological setting 65, 296 Barreal-Uspallata Basin 268, 270, 272 Cerro Calera Formation 31 basins Cerro Corrales 205, 208, 209 pre-Andean tectonic cycle 3, 26–29 comparison with Agrio Formation 211, 213 see also backarc basins; forearc basin deposits; Cerro de la Totora Formation 17 piggyback basins; retroarc basin deposits Cerro de las Cabras Formation 28–29 10Be age determination 40, 278, 279, 286, 315 Cerro El Salto megalandslide 334, 335 pediplains 433, 434, 437 Cerro Manantial Fault 273, 274, 275, 278, 279, 284 10Be concentration, catchment erosion rates 403, 405, Cerro Meso´n Alto pluton 73,75 407, 412 Cerro Salinas Anticline 277 Beazley Basin, vertical gravity gradient 191 Cerro Salinas-Montecito thrust system 246, 247 Bermejo Basin 26, 28, 178, 239 Cerros Colorados frontal range 255, 259, 260 rigidity 196 Cesco Formation 279, 283 vertical gravity gradient 191 Chacay Melehue Formation 133, 134 Boca Lebu Formation 37 Chacayal thrust system 66, 69, 70 Bolivian Orocline 16 Chachahue´n Groups 214 Bouguer anomaly 169, 194, 195, 196 Chachahue´n volcanic complex 206, 213–214 effect of Andean root 190–191, 196 deformation and uplift 215–217 flat slab transition zone 170, 171–172, 173 Early Cretaceous deposits 203, 205–213 inverse flexure modelling 186, 187, 188, 189 structural setting 214–215 Brownish-red Clastic Unit 37 magma components 214 tectonic setting 204–205 14C dating Chalet fault 299, 300, 320 Barreal-Las Pen˜as Deformation Zone 281, 282, 286 Chanic Orogeny 4, 14, 17, 25 Horcones valley deposits 363 deformation 20, 23 Cabeceras Creek 273, 279, 280, 281 Chanic unconformity 17 Cabeza de Toro megalandslide 334, 335 Chihuidos High 215, 216 Cacheuta Basin 72–73,74 Chilenia terrane 14,20 Cacheuta Formation 28–29 Choapa Metamorphic Complex, accretionary prism Cachiyuyo Pediplain 426, 428, 430, 431, 433 20–21, 25 geochronology 434, 436 Choiyoi Group 22, 24, 25, 132, 133, 134, 146, 331 uplift 439–440 thermochronometry 389–397 Cajo´n de Troncoso beds 31 uplift 385–387 Cajo´n Las Len˜as alluvial cone deposits 161 Choiyoi Magmatic Province 29 Caleta Horco´n Formation 38 Chos-Malal fold and thrust belt 18 Caleu pluton 36 Chupasangral fault 317 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3920030/9781862396753_backmatter.pdf by guest on 26 September 2021 INDEX 449 36Cl, TCN dating 336–337, 347, 349, 351–354, 357, Cuesta del Viento Formation 228, 231 359, 360, 363–364 piggyback basin climate evolution 239–241 control on erosion and uplift 401–415 sedimentation 237–239, 238, 242 and landscape evolution 420–421 Cumbre surface 437 and landslides 337–338, 345 Cura-Mallı´n Formation 39–40 Coastal Batholith 23, 24, 25 Curanilahue Formation 37 Coastal Cordillera 1, 2, 15, 16, 70 Curepto-Bio Bı´o-Temuco basin 26, 27 crustal thickening 423 Cuyania terrane 14, 20, 167–168, 175, 176 geological setting 64–65, 329, 330, 331, 424, 425 Cuyo Basin 26, 27, 28, 69, 268, 271, 273, 295 gravity anomaly 191 Cuyo Group 32, 133, 134 influence of precipitation 440–441 Cuyo Precordillera 17, 19 pediplains 426, 427, 428, 429–442 structure 68, 70 dams, sedimentary 230–232, 233, 234, 236, 237, 279 topography and geomorphology 421, 422, 425, 427 debuttressing, and landslides 338, 339 mapping 427 deformation uplift 8, 74, 76–77, 439–440 deep crustal 64 Cobquecura pluton 29 conceptual models 64 Cogotı´ superunit 36 Maipo-Tunuya´n transect 69, 71–77 Colangu¨il batholith 22 kinematic model 67–68 Colimapu Formation 35, 161, 163, 164 thermomechanical modelling 65, 67 Colohuincul Complex 133, 141 Famatinian tectonic cycle 19–20 Conceptio´n Group 37 Quaternary retro-wedges 267–287 Confluencia Formation 38, 421, 425, 433, 439, 440 Quaternary thrust fronts 245–263 conoids 223, 232, 233 Del Cerro Negro de Capiz fault, seismic potential 322 continental breakup 14 Del Peral Anticline 317–319 Contreras Formation 71, 74 Del Peral fault, seismic potential 321 Coquimbo Formation 38, 421, 425, 430, 438, 439 Del Totoral fault, seismic potential 321 coquina 206–209, 210, 211, 213 density models 168–179 Cordillera de la Brea 111, 113, 118 2D models 174–176 Cordillera de la Ortiga 110, 111, 113, 117, 121, 122 depocentres Cordillera del Viento 132, 133, 141, 142 Andean tectonic cycle 29, 32, 168 depocentre 32 pre-Andean tectonic cycle 27, 28,29 Cordillera del Viento Formation 133, 134 Devonian, Famatinian tectonic cycle 17, 20 Co´rdoba terrane
Recommended publications
  • Late Quaternary Morphodynamics in the Quebrada De Purmamarca, NW Argentina

    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

    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

    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

    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

    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

    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

    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-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

    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

    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

    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

    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.