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A Revised Lithostratigraphy of the Sierra Baguales, Magallanes Basin
A revised lithostratigraphy of the Sierra Baguales, Magallanes Basin Enrique Bostelmann 1, Jacobus P. Le Roux 2, Ana Vasquez 2, Nestor Gutiérrez 2, José Luis Oyarzún 3, Catalina Carreño 2, Teresa Torres 4, Rodrigo Otero 5, Andrea Llanos 4, C. Mark Fanning 6, Sven N. Nielsen 7, Francisco Hervé 2,8 1Museo Nacional de Historia Natural, CC. 399, 11.000. Montevideo, Uruguay 2Departamento de Geología, Universidad de Chile / Centro de Excelencia en Geotermia de los Andes, Casilla 13518, Santiago, Chile 3Parque Geológico y Paleontológico, La Cumbre-Baguales 4Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Chile, Correo 1004, Santiago, Chile 5Área Paleontología, Museo Nacional de Historia Natural. Casilla 787, Santiago, Chile 6Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 0200, Australia 7Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Str. 10, 24118 Kiel, Germany 8Departamento de Geología, Universidad Andrés Bello, Santiago, Chile Abstract We present a new lithostratigraphic scheme zircons in the Loreto Formation have been dated at for the Sierra Baguales north of Torres del Paine based 36.48±0.47–36.73±0.5 Ma (Otero et al., 2012), on recent field work, which shows that the stratigraphy whereas zircons in the Río Baguales Formation have of the Lake Argentino region of Argentina is duplicated yielded an age of 40.48±0.37 Ma (Le Roux, 2012). here. The former Río Baguales Formation probably The Loreto Formation was named as early as 1931 by correlates with the Man Aike Formation of Argentina and also in part with the Loreto Formation of the Keidel and Hemmer, whereas its stratigraphic Brunswick Peninsula, so that the name Loreto is equivalents were named much later: the Río Baguales retained for this unit. -
Chronology and Geology of an Early Miocene
Andean Geology 41 (3): 507-528. September, 2014 Andean Geology doi: 10.5027/andgeoV41n3-a02 formerly Revista Geológica de Chile www.andeangeology.cl Chronology and geology of an Early Miocene mammalian assemblage in North of South America, from Cerro La Cruz (Castillo Formation), Lara state, Venezuela: implications in the ‘changing course of Orinoco River’ hypothesis *Ascanio D. Rincón1, Andrés Solórzano1, Mouloud Benammi2, Patrick Vignaud2, H. Gregory McDonald3 1 Laboratorio de Paleontología, Centro de Ecología, Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela. [email protected]; [email protected] 2 Institut de Paléoprimatologie, Paléontologie Humaine, Evolution et Paleonviroments, UMR CNRS 7262-INEE, Université de Poitiers, France. [email protected]; [email protected] 3 Museum Management Program, National Park Service, 1201 Oakridge Drive, Fort Collins, Colorado 80525, U.S.A. [email protected] * Corresponding author: [email protected] ABSTRACT. In general the geology of paleontological sites in Venezuela is poorly known. With the purpose of im- proving this knowledge we describe the geology of the Castillo Formation (Late Oligocene to Early Miocene) at Cerro La Cruz locality, in Lara state, Venezuela, that contains several records of vertebrate and invertebrate fauna. Litholog- ically, the Cerro La Cruz sequence is composed by alternating packages of siliciclastic and carbonate sediments, with a predominance of mudstone. The paleoenvironment is inferred as a mainly near-shore marine complex that could be associated with regressive and transgressive phases. Nevertheless, into the middle part of the Cerro La Cruz outcrops two levels containing at least six mammalian remains were found, confirming the early continental mammal assemblage in Venezuela. -
(Early Miocene) in Lago Posadas, Southwestern Patagonia, Argentina
Andean Geology 46 (2): 383-420. May, 2019 Andean Geology doi: 10.5027/andgeoV46n2-3128 www.andeangeology.cl Sedimentology and fossil vertebrates of the Santa Cruz Formation (early Miocene) in Lago Posadas, southwestern Patagonia, Argentina *José I. Cuitiño1, Sergio F. Vizcaíno2, 3, M. Susana Bargo2, 4, Inés Aramendía5 1 Instituto Patagónico de Geología y Paleontología (IPGP, CCT CONICET-CENPAT). Boulevard Brown 2915, Puerto Madryn (9120), Chubut, Argentina. [email protected] 2 División Paleontología de Vertebrados, Museo de La Plata, Unidades de Investigación Anexo Museo, 60 y 122, La Plata (1900), Argentina. [email protected]; [email protected] 3 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Argentina. 4 Comisión de Investigaciones Científicas (CIC), calle 526 entre 10 y 11, 1900 La Plata-Buenos Aires, Argentina. 5 Instituto Patagónico para el Estudio de Ecosistemas Continentales (IPEEC, CCT CONICET-CENPAT). Boulevard Brown 2915, Puerto Madryn (9120), Chubut, Argentina. [email protected] * Corresponding author: [email protected] ABSTRACT. Lago Posadas is located at the foot of the Southern Patagonian Andes, in southwestern Argentina, where the early Miocene Santa Cruz Formation (SCF) shows thick and laterally continuous exposures. This region has been scarcely explored for fossil vertebrates since the first efforts by J.B. Hatcher in 1898-99. In this contribution, we performed sedimentologic and paleontological studies in order to reconstruct depositional -
Portada Rgch 34-2.Jpg
Crust-mantle interactions and generation of silicic melts: insights from the Sarmiento Complex, southern Patagonian Andes Mauricio Calderón Departamento de Geología, Universidad de Chile, Francisco Hervé Casilla 13518, Correo 21,Santiago, Chile [email protected] [email protected] Umberto Cordani Centro de Pesquisas Geocronológicas, Universidade de São Paulo, Rua do Lago 562, Cidade Universitaria, São Paulo, CEP 05508-900, Brazil [email protected] Hans-Joachim Massonne Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstrasse 18, D-70174, Stuttgart, Germany [email protected] ABSTRACT A Late Jurassic seafloor remnant of the Rocas Verdes basin in southern Chile, the Sarmiento Complex (ca. 52°S), bears lithological layers with bimodal meta-igneous rocks appropriate for a comprehensive investigation of magma genesis in part of a lateral lithological transition from continental rifting to initial seafloor spreading. Metamorphosed mafic ε rocks collected from different layers in the ophiolite pseudostratigraphy and a plagiogranite have positive Nd150 values ε (+ 1 and +2). Granophyres, which are crosscut by ophiolitic mafic dikes, have negative Nd150 values (-5). Dacitic dikes ε within thick successions of pillow basalt have the least negative Nd150 values (-3 and -4). Although mafic and felsic igneous rocks show contrasting isotopic signatures, thermochemical modeling (EC-AFC) suggests they can share a common origin. Models consider an arbitrary composition of the crustal assimilant (mostly metapelite with an average ε Nd150 value of -7) and evaluate the feasibility for generation of silicic melts through the interaction of mafic magmas and metasedimentary rocks. A quantitative evaluation of basaltic magma contaminated by crustal wall rocks requires a Ma*/ Mc (mass of anatectic melt/ mass of cumulates) ratio of 0.04. -
Sedimentary Record of Andean Mountain Building
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/321814349 Sedimentary record of Andean mountain building Article in Earth-Science Reviews · March 2018 DOI: 10.1016/j.earscirev.2017.11.025 CITATIONS READS 12 2,367 1 author: Brian K. Horton University of Texas at Austin 188 PUBLICATIONS 5,174 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Petroleum Tectonic of Fold and Thrust Belts View project Collisional tectonics View project All content following this page was uploaded by Brian K. Horton on 15 December 2018. The user has requested enhancement of the downloaded file. Earth-Science Reviews 178 (2018) 279–309 Contents lists available at ScienceDirect Earth-Science Reviews journal homepage: www.elsevier.com/locate/earscirev Invited review Sedimentary record of Andean mountain building T Brian K. Horton Department of Geological Sciences and Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, United States ARTICLE INFO ABSTRACT Keywords: Integration of regional stratigraphic relationships with data on sediment accumulation, provenance, Andes paleodrainage, and deformation timing enables a reconstruction of Mesozoic-Cenozoic subduction-related Fold-thrust belts mountain building along the western margin of South America. Sedimentary basins evolved in a wide range of Foreland basins structural settings on both flanks of the Andean magmatic arc, with strong signatures of retroarc crustal Orogeny shortening, flexure, and rapid accumulation in long-lived foreland and hinterland basins. Extensional basins also Sediment provenance formed during pre-Andean backarc extension and locally in selected forearc, arc, and retroarc zones during Late Stratigraphy Subduction Cretaceous-Cenozoic Andean orogenesis. -
Burdigalian Deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, Depositional Environment and Vertebrate Fossils
Andean Geology 40 (3): 458-489, September, 2013 Andean Geology doi: 10.5027/andgeoV40n3-a0410.5027/andgeoV40n3-a?? formerly Revista Geológica de Chile www.andeangeology.cl Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils J. Enrique Bostelmann1, 2, Jacobus P. Le Roux3, Ana Vásquez3, Néstor M. Gutiérrez3, José Luis Oyarzún4, Catalina Carreño3, Teresa Torres5, Rodrigo Otero2, Andrea Llanos5, C. Mark Fanning6, Francisco Hervé3, 7 1 Museo Nacional de Historia Natural, 25 de Mayo 582, Montevideo, Uruguay. [email protected] 2 Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Avda. Las Palmeras 3425, Ñuñoa, Santiago,Chile. [email protected] 3 Departamento de Geología, Universidad de Chile, Centro de Excelencia en Geotermia de los Andes, Plaza Ercilla 803, Santiago, Chile. [email protected]; [email protected]; [email protected]; [email protected]; [email protected] 4 Callejón Pedro Méndez, Huerto N° 112, Puerto Natales, Chile. [email protected] 5 Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Chile, Avda. Santa Rosa N° 11315, La Pintana, Santiago, Chile. [email protected]; [email protected] 6 Research School of Earth Sciences, The Australian National University, Building 142 Mills Road, ACT 0200, Canberra, Australia. [email protected] 7 Escuela de Ciencias de la Tierra, Universidad Andrés Bello, Salvador Sanfuentes 2357, Santiago, Chile. ABSTRACT. A succession of marine and continental strata on the southern flank of Cerro Cono in the Sierra Baguales, northeast of Torres del Paine, can be correlated with stratigraphic units exposed along the southern border of the Lago Argentino region in Santa Cruz Province, Argentina. -
Review of the Cambrian Pampean Orogeny of Argentina; a 2 Displaced Orogen Formerly Attached to the Saldania Belt of 3 South Africa? 4 5 César Casqueta*, Juán A
1 Review of the Cambrian Pampean orogeny of Argentina; a 2 displaced orogen formerly attached to the Saldania Belt of 3 South Africa? 4 5 César Casqueta*, Juán A. Dahlquistb, Sebastián O. Verdecchiab, Edgardo G. 6 Baldob, Carmen Galindoa, Carlos W. Rapelac, Robert, J. Pankhurstd, Matias 7 M. Moralesb, Juán A. Murrab, C. Mark Fanninge 8 9 a Departamento de Petrología y Geoquímica, Facultad de Ciencias Geológicas, Instituto de 10 Geología Económica (CSIC), Universidad Complutense, 28040 Madrid, Spain1 11 b Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET, Universidad 12 Nacional de Córdoba, Av. Vélez Sarsfield 1611, Pab. Geol., X5016CGA Córdoba, Argentina 13 c Centro de Investigaciones Geológicas, CONICET, Universidad Nacional de la Plata, 1900 La 14 Plata, Argentina 15 d Visiting Research Associate, British Geological Survey, Keyworth, Nottingham NG12 5GG, 16 UK 17 e Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, 18 Australia 19 20 21 Keywords: Pampean orogeny; Saldanian orogeny; Sierras Pampeanas; Gondwana; Mara 22 terrane; collisional orogeny 23 24 25 Abstract 26 27 The Pampean orogeny of northern Argentina resulted from Early Cambrian oblique 28 collision of the Paleoproterozoic MARA block, formerly attached to Laurentia, with the 29 Gondwanan Kalahari and Rio de la Plata cratons. The orogen is partially preserved 30 because it is bounded by the younger Córdoba Fault on the east and by the Los Túneles 31 Ordovician shear zone on the west. In this review we correlate the Pampean Belt with 32 the Saldania orogenic belt of South Africa and argue that both formed at an active 33 continental margin fed with sediments coming mainly from the erosion of the 34 Brasiliano–Pan-African and East African–Antarctica orogens between ca. -
Index Extensional Tectonics and Stratigraphy of the North Atlantic Margins
INDEX EXTENSIONAL TECTONICS AND STRATIGRAPHY OF THE NORTH ATLANTIC MARGINS TANKARD/BALKWILL Aaiun basin, Morocco: seismic line, 330 Asymmetrical rift basins with deep detachments: 45 stratigraphic column, 332 stratigraphic cross section, 338 Atlantic, Canadian: Central, Jurassic-Cretaceous, Abenaki basin, Canadian Atlantic margin: 179 ridge propagation, 117 sea-floor spreading, 117 Agadir basin, Morocco: Central North, ancient stress fields, 289 structural cross section, 329 Mesozoic extension, 175 North, -Arctic, Antarctica: age of ocean crust, 112 and southern Australia, reconstruction between, 29 Aptian/Albian paleotectonic/geographic map, 122 correlation of basins and their tectonic lineaments, 145 Appalachian basin: crustal extension, 418 Mesozoic reactivation of older fault zones, 165 early evolution, Triassic half-grabens, tectonic setting, 155 gravity data, 130 magnetic data, 130 Appalachian orogeny: general bathymetry, 132 effect on Canadian Atlantic margin, geology, 177 gravity and magnetic signatures of sedimentary basins, 136 initiation of the Iceland Plume, 149 Arctic: Jurassic paleotectonic/geographic map, 120 Aptian/Albianpaleotectonic/geographic map, 122 rifting processes, 123 Jurassic paleotectonic/geographic map, 120 Paleocene paleotectonic/geographic map, 124 Paleocene paleotectonic/geographic map, 124 paleotectonic/geographic map, 118 Permian/Carboniferous paleotectonic/geographic map, 116 Permian/Carboniferous paleotectonic/geographic map, 116 Triassic paleotectonic/geographic map, 118 plate tectonics, 418 sedimentary -
Tierra Del Fuego Island
Geologica Acta, Vol.6, Nº 1, March 2008, 19-42 DOI: 10.1344/105.000000239 Available online at www.geologica-acta.com Structural geology of the Fuegian Andes and Magallanes fold-and-thrust belt – Tierra del Fuego Island 1 2 3 M. MENICHETTI E. LODOLO and A. TASSONE 1 Istituto di Scienze della Terra, Università di Urbino Campus Científico Universitario, 61029 Urbino, Italy. E-mail: [email protected] 2 Istituto Nazionale di Oceanografia e di Geofisica Sperimentale 34010 Sgonico,Trieste, Italy. E-mail: [email protected] 3 CONICET- INGEODAV, Dept. de Geología, FCEyN, Universidad de Buenos Aires, Argentina Ciudad Universitaria, 1428 Buenos Aires, Argentina.E-mail: [email protected] ABSTRACT A synthesis of the structural geology of the Tierra del Fuego Island, which integrates a new data set derived from field surveys and literature data of the last few years, is here presented. The main geological features of the region developed during the Mesozoic-Cenozoic Andean orogenic cycle that started in the Middle to Late Jurassic with a back-arc extension, crustal stretching and widespread volcanism, related to the break-up of Gondwanaland. An extensional fault system deriving from the mechanical and thermal subsidence led the evolution of the Rocas Verdes marginal basin, which hosts the upper Jurassic volcanoclastic rocks, the lower Cretaceous turbiditic sequences and few isolated elongated ophiolitic complexes. From the Late Cretaceous onward, the orogenic cycle of the Fuegian Andes continued with the shortening and inversion of the back-arc margin through horizontal con- traction and crustal thickening. The uplift of the Cordillera, the emplacement of plutonic rocks, and the intraconti- nental polyphase deformation resulted from thick-skinned tectonics. -
ENERGY AGENDA a Challenge for the Country, Progress for Everyone
ENERGY AGENDA A CHALLENGE FOR THE COUNTRY, PROGRESS FOR EVERYONE ENERGY AGENDA A CHALLENGE FOR THE COUNTRY, PROGRESS FOR EVERYONE May 2014 INTRODUCTION 7 SETTING OF AN AGENDA 11 CHILE’S ENERGY CHALLENGES 17 GOALS AND PURPOSES OF THE ENERGY AGENDA 01 02 03 04 21 34 45 58 A NEW ROLE for REDUCTION OF DEVELOPMENT OF CONNECTIVITY the state ENERGY PRICES, our OWN ENERGY FOR ENERGY WITH higher RESOURCES development COMPETITION, EFFICIENCY AND DIVERSIFICATION of THE ENERGY MARKET 4 Ministry of Energy 05 06 07 08 67 76 85 91 AN EFFICIENT BOOST for CITIZEN ANNEXES SECTOR managing INVESTMENT involvement CONSUMPTION IN energy AND TERRITORIAL infrastructure regulation Energy Agenda 5 6 Ministry of Energy SETTING OF AN AGENDA President Michelle Bachelet has promoted important transformations for our country’s advance towards more social equity and progress. To achieve this, we need to develop a new phase of competitiveness, innovation and productivity. As one of the 50 measures for the first 100 days of Government, the Ministry of Energy was en- trusted with the preparation of an agenda to be used as a road map to devise and implement a long-term Energy Policy with social, political and technical validation. Since the beginning, this agenda was intended to be prepared in an open and participative manner. Therefore, as a ministry team, we held meetings and exchanged ideas with different so- cial, political, parliamentary, municipal, business, NGO, and academic actors that have thought about, and assessed the country’s energy situation. It would have been impossible to set a really useful, guiding, and executive agenda without this dialogue. -
Austral-Magallanes Basin, Argentina): a Multidisciplinary Approach to Reconstructing Ancient Terrestrial Landscapes
LAJSBA LATIN AMERICAN JOURNAL OF SEDIMENTOLOGY AND BASIN ANALYSIS | VOLUME 25 (2) 2018, 117-148 PALEOSOLS AND RELATED SOIL-BIOTA OF THE EARLY MIOCENE SANTA CRUZ FORMATION (AUSTRAL-MAGALLANES BASIN, ARGENTINA): A MULTIDISCIPLINARY APPROACH TO RECONSTRUCTING ANCIENT TERRESTRIAL LANDSCAPES M. Sol Raigemborn 1,2,*, Verónica Krapovickas 3, Alejandro F. Zucol 4, Luciano Zapata 5, Elisa Beilinson 1,6, Nestor Toledo 7, Jonathan Perry 8, Sabrina Lizzoli 1, Lucía Martegani 9, David E. Tineo 1,10, Esteban Passeggi 4 1 CONICET - UNLP. Centro de Investigaciones Geológicas, Diagonal 113 Nº 275 (1900) La Plata, Argentina. 2 Cátedra de Micromorfología de Suelos, Facultad de Ciencias Naturales y Museo, UNLP, Calle 122 y 60 s/n, (1900) La Plata, Argentina. 3 IDEAN - CONICET, Departamento de Ciencias Geológicas, FCEyN, UBA, Ciudad Universitaria, Pab. 2, (C1428EHA) Buenos Aires, Argentina. 4 Laboratorio de Paleobotánica, Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción (CICYTTP-UADER Provincia de Entre Ríos - CONICET), Dr. Materi y España SN, E3105BWA, Diamante, Argentina. 5 Cátedra de Fundamentos de Geología, Facultad de Ciencias Naturales y Museo, UNLP, Calle 122 y 60 s/n (1900) La Plata, Argentina. 6 Cátedra de Sedimentología Especial, Facultad de Ciencias Naturales y Museo, UNLP, Calle 122 y 60 s/n (1900) La Plata, Argentina. 7 División Paleontología Vertebrados, Unidades de Investigación, Anexo Museo, Facultad de Ciencias Naturales y Museo, Avenida 60 y 122, 1900, La Plata, Argentina. CONICET. 8 Center for Functional Anatomy and Evolution, The Johns Hopkins University School of Medicine, Baltimore, USA. 9 Cátedra de Mineralogía, Facultad de Ciencias Naturales y Museo, UNLP, Calle 122 y 60 s/n (1900) La Plata, Argentina. -
Cretaceous-Cenozoic Growth of the Patagonian Broken Foreland Basin
Journal of South American Earth Sciences 97 (2020) 102242 Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Cretaceous-Cenozoic growth of the Patagonian broken foreland basin, T Argentina: Chronostratigraphic framework and provenance variations during transitions in Andean subduction dynamics ∗ Kristina L. Butlera,b, , Brian K. Hortona,b, Andrés Echaurrenc, Andrés Folguerac, Facundo Fuentesd a Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, USA b Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, USA c Instituto de Estudios Andinos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, Buenos Aires, Argentina d YPF S.A., 515 Macacha Güemes, Buenos Aires, Argentina ARTICLE INFO ABSTRACT Keywords: The Cretaceous-Cenozoic evolution of the Patagonian broken foreland basin system at 42–43°S in the northern Andes Chubut province of Argentina is associated with variable retroarc phases of fold-thrust belt shortening, exten- Patagonia sion, and basement uplift during changes in the dynamics of oceanic slab subduction. Basement inheritance and Foreland basin progressive shallowing of an east-dipping subducting slab are important mechanisms of foreland partitioning, as Provenance dictated by the preexisting (pre-Andean) structural architecture and forelandward (eastward) advance of Late U-Pb geochronology Cretaceous arc magmatism. Previously recognized growth strata help define the timing of fold-thrust belt Hf isotopes shortening and retroarc basement-involved uplift, but the precise consequences for sediment routing remain poorly understood, with uncertainties in patterns of basin evolution before, during, and after shallowing and resteepening of the subducting slab.