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Hadley Circulation Shrinkage in the Mid-Cretaceous
Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Clim. Past Discuss., 7, 119–151, 2011 www.clim-past-discuss.net/7/119/2011/ Climate of the Past CPD doi:10.5194/cpd-7-119-2011 Discussions 7, 119–151, 2011 © Author(s) 2011. CC Attribution 3.0 License. Hadley circulation This discussion paper is/has been under review for the journal Climate of the Past (CP). shrinkage in the Please refer to the corresponding final paper in CP if available. mid-Cretaceous Drastic shrinking of the Hadley circulation H. Hasegawa et al. during the mid-Cretaceous supergreenhouse Title Page Abstract Introduction H. Hasegawa1,*, R. Tada1, X. Jiang2, Y. Suganuma1,3, S. Imsamut4, P. Charusiri5, Conclusions References N. Ichinnorov6, and Y. Khand6 Tables Figures 1Department of Earth and Planetary Science, the University of Tokyo, Tokyo, Japan 2 Chengdu Institute of Geology and Mineral Resources, Chengdu, China J I 3National Institute of Polar Research, Tokyo, Japan 4Department of Mineral Resources, Bureau of Geological Survey, Bangkok, Thailand J I 5Department of Geology, Chulalongkorn University, Bangkok, Thailand Back Close 6Paleontological Center, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia * now at: Department of Natural History Science, Hokkaido University, Full Screen / Esc Sapporo 060-0810, Japan Received: 14 September 2010 – Accepted: 7 December 2010 – Published: 13 January 2011 Printer-friendly Version Correspondence to: H. Hasegawa (hito [email protected]) Interactive Discussion Published by Copernicus Publications on behalf of the European Geosciences Union. 119 Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Abstract CPD Understanding the behaviour of the global climate system during extremely warm pe- riods is one of the major themes of paleoclimatology. -
The Cambrian System in Northwestern Argentina: Stratigraphical and Palaeontological Framework Discussion Geologica Acta: an International Earth Science Journal, Vol
Geologica Acta: an international earth science journal ISSN: 1695-6133 [email protected] Universitat de Barcelona España Buatois, L.A.; Mángano, M.G. Discussion and reply: The Cambrian System in Northwestern Argentina: stratigraphical and palaeontological framework Discussion Geologica Acta: an international earth science journal, vol. 3, núm. 1, 2005, pp. 65-72 Universitat de Barcelona Barcelona, España Available in: http://www.redalyc.org/articulo.oa?id=50530107 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 Geologica Acta, Vol.3, Nº1, 2005, 65-72 Available online at www.geologica-acta.com Discussion and reply: The Cambrian System in Northwestern Argentina: stratigraphical and palaeontological framework Discussion L.A. BUATOIS and M.G. MÁNGANO CONICET- INSUGEO Casilla de correo 1 (correo central), 4000 San Miguel de Tucumán, Argentina. Present address: Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N 5E2, Canada. Buatois E-mail: [email protected] INTRODUCTION this rift corresponds to the early above-mentioned Punco- viscana basin”. This gives the wrong impression that there As part of the Special Issue on “Advances in the is some sort of consensus on this topic, which is incorrect. knowledge of the Cambrian System” edited by himself, Interestingly enough, this southern rift branch is perpendi- Aceñolaza (2003) attempted to summarize present know- cular to the Gondwana Pacific trench (see his figure 3), an ledge on the Cambrian of northwest Argentina. -
A History of Proterozoic Terranes in Southern South America: from Rodinia to Gondwana
+ MODEL GEOSCIENCE FRONTIERS -(-) (2011) 1e9 available at www.sciencedirect.com China University of Geosciences (Beijing) GEOSCIENCE FRONTIERS journal homepage: www.elsevier.com/locate/gsf REVIEW A history of Proterozoic terranes in southern South America: From Rodinia to Gondwana C. Casquet a,*, C.W. Rapela b, R.J. Pankhurst c, E.G. Baldo d, C. Galindo a, C.M. Fanning e, J.A. Dahlquist d, J. Saavedra f a Departamento de Petrologıa y Geoquımica, IGEO (Universidad Complutense, CSIC), 28040 Madrid, Spain b Centro de Investigaciones Geologicas (CONICET-UNLP), 1900 La Plata, Argentina c Visiting Research Associate, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom d CICTERRA (CONICET-UNC), 5000 Cordoba, Argentina e Research School of Earth Sciences, The Australian National University, Canberra, Australia f Instituto de Agrobiologıa y Recursos Naturales CSIC, 37071 Salamanca, Spain Received 3 August 2011; accepted 8 November 2011 KEYWORDS Abstract The role played by Paleoproterozoic cratons in southern South America from the Mesopro- Paleoproterozoic; terozoic to the Early Cambrian is reconsidered here. This period involved protracted continental amal- Cratons; gamation that led to formation of the supercontinent Rodinia, followed by Neoproterozoic continental Grenvillian; break-up, with the consequent opening of Clymene and Iapetus oceans, and finally continental Neoproterozoic rifting; re-assembly as Gondwana through complex oblique collisions in the Late Neoproterozoic to Early SW Gondwana assembly Cambrian. The evidence for this is based mainly on a combination of precise U-Pb SHRMP dating and radiogenic isotope data for igneous and metamorphic rocks from a large area extending from the Rio de la Plata craton in the east to the Argentine Precordillera in the west and as far north as Arequipa in Peru. -
Provenance and Tectonic Implications of Orán Group Foreland Basin
Basin Research (2015) 1–17, doi: 10.1111/bre.12139 Provenance and tectonic implications of Oran Group foreland basin sediments,RıoIruyacanyon,NW Argentina (23° S) William H. Amidon,* Lisa V. Luna,* George B. Fisher,† Douglas W. Burbank,† Andrew R. C. Kylander-Clark† and Ricardo Alonso‡ *Middlebury College Geology Department, Middlebury, VT, USA †Earth Research Institute, University of California, Santa Barbara, CA, USA ‡Departamento de Geologıa, Universidad Nacional de Salta, Salta, Argentina ABSTRACT Foreland basins are important recorders of tectonic and climatic processes in evolving mountain ranges. The Rıo Iruya canyon of NW Argentina (23° S) exposes ca. 7500 m of Oran Group foreland basin sediments, spanning over 8 Myr of near continuous deposition in the Central Andes. This study presents a record of sedimentary provenance for the Iruya Section in the context of a revised stratigraphic chronology. We use U-Pb zircon ages from six interbedded ash layers and new magnet- ostratigraphy to constrain depositional ages in the section between 1.94 and 6.49 Ma, giving an aver- 1 age sedimentation rate of 0.93 0.02 (2r) km MyrÀ . We then pair U-Pb detrital zircon dating Æ with quartz trace-element analysis to track changes in sedimentary provenance from ca. 7.6 to 1.8 Ma. Results suggest that from ca. 7.6 to ca. 6.3 Ma, the Iruya watershed did not tap the Salta Group or Neogene volcanics that are currently exposed in the eastern Cordillera and Puna margin. One explanation is that a long-lived topographic barrier separated the eastern Puna from the foreland for much of the mid-late Miocene, and that the arrival of Jurassic-Neogene zircons records regional tectonic reactivation at ca. -
34 Abdala.Indd
Ciencias de la Tierra y Recursos Naturales del NOA Relatorio del XX Congreso Geológico Argentino - Tucumán 2017 VERTEBRADOS FÓSILES DEL MESOZOICO DEL NOROESTE ARGENTINO Fernando ABDALA1,2, Sara BERTELLI1 1UEL, Unidad Ejecutora Lillo (CONICET-FML) Miguel Lillo 251, 4000, Tucumán, Argentina. Email: [email protected] 2Evolutionary Studies Institute, University of the Witwatersrand Johannesburgo, Sudáfrica RESUMEN En la presente contribución se detalla el registro de fósiles vertebrados mesozoicos en el noroeste de Argentina. El mismo se compone de una parte triásica y otra cretácica, pero hay también un registro puntual del Jurásico. El Triásico se presenta en la cuenca de Ischigualasto-Villa Unión en las provincias de San Juan y La Rioja y en la cuenca de Marayes-El Carrizal al sur de San Juan, mientras que el Jurásico Inferior existe en la última cuenca y en la Formación Cañón del Colorado en el centro de la provincia de San Juan. El Cretácico está documentado en la Formación Los Llanos de La Rioja y en la cuenca del Noroeste en Jujuy y Salta. El Triásico Superior es el mejor representado mostrando una buena diversidad de arcosauromorfos. El mejor registro de dinosauriformes no dinosaurianos es en la Formación Chañares, mientras que los dinosaurios más antiguos del mundo aparecen ya bien diversifi cados en la Formación Ischigualasto y se vuelven abundantes en Los Colorados. Dicinodontes son componentes residuales (poco diversos y abundantes), mientras que los cinodontes son abundantes en la Formación Chañares y abundantes y más diversifi cados en la fauna de Ischigualasto. Registros antiguos de tortugas existen en las formaciones Los Colorados y Quebrada del Barro, y en esta última hay también esfeno- dontes. -
Anatomy of the Early Cretaceous Enantiornithine Bird Rapaxavis Pani
Anatomy of the Early Cretaceous enantiornithine bird Rapaxavis pani JINGMAI K. O’CONNOR, LUIS M. CHIAPPE, CHUNLING GAO, and BO ZHAO O’Connor, J.K., Chiappe, L.M., Gao, C., and Zhao, B. 2011. Anatomy of the Early Cretaceous enantiornithine bird Rapaxavis pani. Acta Palaeontologica Polonica 56 (3): 463–475. The exquisitely preserved longipterygid enantiornithine Rapaxavis pani is redescribed here after more extensive prepara− tion. A complete review of its morphology is presented based on information gathered before and after preparation. Among other features, Rapaxavis pani is characterized by having an elongate rostrum (close to 60% of the skull length), rostrally restricted dentition, and schizorhinal external nares. Yet, the most puzzling feature of this bird is the presence of a pair of pectoral bones (here termed paracoracoidal ossifications) that, with the exception of the enantiornithine Concornis lacustris, are unknown within Aves. Particularly notable is the presence of a distal tarsal cap, formed by the fu− sion of distal tarsal elements, a feature that is controversial in non−ornithuromorph birds. The holotype and only known specimen of Rapaxavis pani thus reveals important information for better understanding the anatomy and phylogenetic relationships of longipterygids, in particular, as well as basal birds as a whole. Key words: Aves, Enantiornithes, Longipterygidae, Rapaxavis, Jiufotang Formation, Early Cretaceous, China. Jingmai K. O’Connor [[email protected]], Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, 142 Xizhimenwaidajie, Beijing, China, 100044; The Dinosaur Institute, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007 USA; Luis M. Chiappe [[email protected]], The Dinosaur Institute, Natural History Museum of Los Angeles County, 900 Ex− position Boulevard, Los Angeles, CA 90007 USA; Chunling Gao [[email protected]] and Bo Zhao [[email protected]], Dalian Natural History Museum, No. -
From Rodinia to Gondwana
A history of Proterozoic terranes in southern South America: From Rodinia to Gondwana C. Casquet a,*, c.w. Rapela b, R.J. Pankhurst c, E.G. Baldo d, C. Galindo a, C.M. Fanning e, J.A. Dahlquist d, J. Saavedra f a Departamento de Petrologia y Geoquimica, ICEO (Universidad Complutense, CSIC), 28040 Madrid, Spain b Centra de Investigaciones Geologicas (CONICET-UNLP), 1900 La Plata, Argentina C 'Visiting Research Associate, British Geological SUlVey, Keyworth, Nottingham NG12 SCC, United Kingdom d CICTERRA (CONICET-UNC), 5000 Cordoba, Argentina e Research School of Earth Sciences, The Australian National University, Canberra, Australia f Instituto de Agrobiologia y Recursos Naturales CSIC, 37071 Salamanca, Spain KEYWORDS Abstract The role played by Paleoproterozoic cratons in southern South America from the Mesopro Paleoproterozoic; terozoic to the Early Cambrian is reconsidered here. This period involved protracted continental amal Cratons; gamation that led to formation of the supercontinent Rodinia, followed by N eoproterozoic continental Grenvillian; break-up, with the consequent opening of Clymene and Iapetus oceans, and finally continental Neoproterozoic rifting; re-assembly as Gondwana through complex oblique collisions in the Late Neoproterozoic to Early SW Gondwana assembly Cambrian. The evidence for this is based mainly on a combination of precise U-Pb SHRMP dating and radiogenic isotope data for igneous and metamorphic rocks from a large area extending from the Rio de la Plata craton in the east to the Argentine Precordillera in the west and as far north as Arequipa in Peru. Our interpretation of the paleogeograpbical and geodynamic evolution invokes a hypothetical Paleoproterozoic block (MARA) embracing basement ultimately older than 1.7 Ga in the Western Sierras 1. -
Provenance Study on Neoproterozoic Rocks of Nw Argentina: Puncoviscana Formation – First Results
U N I V E R S I D A D D E C O N C E P C I Ó N DEPARTAMENTO DE CIENCIAS DE LA TIERRA 10° CONGRESO GEOLÓGICO CHILENO 2003 PROVENANCE STUDY ON NEOPROTEROZOIC ROCKS OF NW ARGENTINA: PUNCOVISCANA FORMATION – FIRST RESULTS ZIMMERMANN, U.1 1Dep.of Geol., RAU University, Auckland Park 2092, South Africa [email protected] INTRODUCTION Since more than 20 years the western border of Gondwana is object of controversies related to the basic question if crustal growth is related to terrane accretion or to “recycling” of the same crustal rocks during the Vendian and Lower Paleozoic. Different hypotheses were developed regarding the evolution of that margin. One of the key element to understand the crustal evolution, is the Vendian to Lower Cambrian so-called PVF. Turner (1960) described rock successions in northwestern Argentina (Fig. 1) of Pre-Ordovician age comprising greywackes and sand- and siltstones, but dominated by pelites as the PVF. Afterwards, it was established that mostly all Vendian to Lower Cambrian very-low to low grade metasedimentary rocks in the region are classified, such as Suncho, Negro Peinado or La Cébila Formation (e.g. comp. in Aceñolaza et al., 1988), are equivalents of the PVF. Widely distributed medium- to high-grade metasedimentary rocks (Fig. 1), those rocks were interpreted as exhumed deeper crustal levels of the PVF (Willner, 1990). Other authors deny this opinion and interpret the different metamorphic rocks related to different events, consequently of different ages (Mon and Hongn, 1990). Based on only punctual petrographic work, the depositional area was defined as a passive margin based on petrography and mainly major element geochemistry (Jezek, 1990, Willner et al., 1985, Rossi Toselli et al., 1997), or on preliminary trace element data (Do Campo and Ribeiro Guevara, 2002). -
Abelisauroidea and Carchardontosauridae (Theropoda, Dinosauria) in the Cretaceous of South America
Abelisauroidea and carchardontosauridae (theropoda, dinosauria) in the cretaceous of south america. Paleogeographical and geocronological implications Carlos Roberto dos Anjos Candeiro, Agustín Guillermo Martinelli ABELISAUROIDEA AND CARCHARDONTOSAURIDAE (THEROPODA, DINOSAURIA) IN THE CRETACEOUS OF SOUTH AMERICA. PALEOGEOGRAPHICAL AND GEOCRONOLOGICAL IMPLICATIONS Abelisauroidea e Carcharodontosauridae (Theropoda, Dinosauria) na América do Sul durante do Cretáceo. Implicações paleogeograficas e geocronologicas Carlos Roberto dos Anjos Candeiro Depart. Geologia, Universidade Federal do Rio de Janeiro [email protected], [email protected] Agustín Guillermo Martinelli Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Av. Ángel Gallardo 470, C1405DJR, Buenos Aires, Argentina [email protected] Artigo recebido em 18/10/2004 e aceito para publicação em 31/08/2005 ABSTRACT: In this contribution an up-to-date list of abelisauroid ceratosaurians and carcharodontosaurid allosaurians recognized in South America is presented. Abelisauroids and carcharodontosaurids in South America show rich species diversity and a wide range of temporal and geographical distribution. At least eight formally described species of Abelisauroidea are recognized in Argen- tina and only one in Brazil; in contrast, only one species of Carcharodontosauridae is known for all South America. The fossil record of abelisauroids and carcharodontosaurids in South America shows a dominance of abelisauroids in the upper late Cretaceous, while the dominance of carcharodontosaurids as large predators was during the Cenomanian-Turonian. Although knowl- edge of the evolution of Abelisauroidea and Carcharodontasauridae in South America, as well as in the rest of Gondwana is still far for being complete, intensive explorations in recent years have provided greater insight into the composition of theropod faunas in the Cretaceous of Gondwana. -
From Rodinia to Gondwana
GEOSCIENCE FRONTIERS 3(2) (2012) 137e145 available at www.sciencedirect.com China University of Geosciences (Beijing) GEOSCIENCE FRONTIERS journal homepage: www.elsevier.com/locate/gsf GSF REVIEW A history of Proterozoic terranes in southern South America: From Rodinia to Gondwana C. Casquet a,*, C.W. Rapela b, R.J. Pankhurst c, E.G. Baldo d, C. Galindo a, C.M. Fanning e, J.A. Dahlquist d, J. Saavedra f a Departamento de Petrologıa y Geoquımica, IGEO (Universidad Complutense, CSIC), 28040 Madrid, Spain b Centro de Investigaciones Geologicas (CONICET-UNLP), 1900 La Plata, Argentina c Visiting Research Associate, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom d CICTERRA (CONICET-UNC), 5000 Cordoba, Argentina e Research School of Earth Sciences, The Australian National University, Canberra, Australia f Instituto de Agrobiologıa y Recursos Naturales CSIC, 37071 Salamanca, Spain Received 3 August 2011; accepted 8 November 2011 Available online 3 December 2011 KEYWORDS Abstract The role played by Paleoproterozoic cratons in southern South America from the Mesopro- Paleoproterozoic; terozoic to the Early Cambrian is reconsidered here. This period involved protracted continental amal- Cratons; gamation that led to formation of the supercontinent Rodinia, followed by Neoproterozoic continental Grenvillian; break-up, with the consequent opening of Clymene and Iapetus oceans, and finally continental Neoproterozoic rifting; re-assembly as Gondwana through complex oblique collisions in the Late Neoproterozoic to Early SW Gondwana assembly Cambrian. The evidence for this is based mainly on a combination of precise U-Pb SHRMP dating and radiogenic isotope data for igneous and metamorphic rocks from a large area extending from the Rio de la Plata craton in the east to the Argentine Precordillera in the west and as far north as Arequipa in Peru. -
Theropod Dinosaurs from Argentina
139 Theropod dinosaurs from Argentina Martín D. EZCURRA1 & Fernando E. NOVAS2 1CONICET, Sección Paleontología Vertebrados, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Angel Gallardo 470, Buenos Aires, C1405DJR, Argentina. [email protected], Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Ángel Gallardo 470, Buenos Aires, C1405DJR, Argentina. [email protected] Abstract. Theropoda includes all the dinosaurs more closely related to birds than to sauropodomorphs (long-necked dinosaurs) and ornithischians (bird-hipped dinosaurs). The oldest members of the group are early Late Triassic in age, and non-avian theropods flourished during the rest of the Mesozoic until they vanished in the Cretaceous-Palaeogene mass extinction. Theropods radiated into two main lineages, Ceratosauria and Tetanurae, which are well represented in Cretaceous rocks from Argentina. Ceratosaurians are the most taxonomically diverse South American non-avian theropods, including small to large-sized species, such as the iconic horned dinosaur Carnotaurus. Argentinean tetanurans are represented by multiple lineages that include some of the largest carnivorous dinosaurs known worldwide (carcharodontosaurids), the enigmatic large-clawed megaraptorans, and small to medium-sized species very closely related to avialans (e.g. unenlagiids). The Argentinean non-avian theropod record has been and is crucial to understand the evolutionary and palaeobiogeographical -
Chapter 5 the Pre-Andean Phases of Construction of the Southern Andes Basement in Neoproterozoic-Paleozoic Times
133 Chapter 5 The Pre-Andean phases of construction of the Southern Andes basement in Neoproterozoic-Paleozoic times Nemesio Heredia; Joaquín García-Sansegundo; Gloria Gallastegui; Pedro Farias; Raúl E. Giacosa; Fernando D. Hongn; José María Tubía; Juan Luis Alonso; Pere Busquets; Reynaldo Charrier; Pilar Clariana; Ferrán Colombo; Andrés Cuesta; Jorge Gallastegui; Laura B. Giambiagi; Luis González-Menéndez; Carlos O. Limarino; Fidel Martín-González; David Pedreira; Luis Quintana; Luis Roberto Rodríguez- Fernández; Álvaro Rubio-Ordóñez; Raúl E. Seggiaro; Samanta Serra-Varela; Luis A. Spalletti; Raúl Cardó; Victor A. Ramos Abstract During the late Neoproterozoic and Paleozoic times, the Southern Andes of Argentina and Chile (21º-55º S) formed part of the southwestern margin of Gondwana. During this period of time, a set of continental fragments of variable extent and allochtony was successively accreted to that margin, resulting in six Paleozoic orogenies of different temporal and spatial extension: Pampean (Ediacaran-early Cambrian), Famatinian (Middle Ordovician-Silurian), Ocloyic (Middle Ordovician-Devonian), Chanic (Middle Devonian-early Carboniferous), Gondwanan (Middle Devonian-middle Permian) and Tabarin (late Permian-Triassic). All these orogenies culminate with collisional events, with the exception of the Tabarin and a part of the Gondwanan orogenies that are subduction-related. Keywords Paleozoic, Southern Andes, Pampean orogen, Ocloyic orogen, Famatinian orogen, Chanic orogen, Gondwanan orogen, Tabarin orogen. 133 134 1 Introduction In the southern part of the Andean Cordillera (21º-55º S, Fig. 1A) and nearby areas, there are Neoproterozoic (Ediacaran)-Paleozoic basement relicts of variable extension. This basement has been involved in orogenic events prior to the Andean orogeny, which is related to the current configuration of the Andean chain (active since the Cretaceous).