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Geologica acta

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Geologica acta 11 records found  Search took 0.01 seconds. 
1.
2 p, 527.3 KB Foreword / Riccardi, Alberto Carlos (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo)
2005 - 10.1344/105.000001398
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 79-80 (Articles)  
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2.
26 p, 1.9 MB Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina : tectosedimentary Evolution of the First Transgression / Lanés, S. (Universidad de Buenos Aires. Departamento de Geología)
The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northern Neuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. [...]
2005 - 10.1344/105.000001399
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 81-106  
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3.
12 p, 897.7 KB Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) / Zavala, C. (Universidad Nacional del Sur. Departamento de Geología) ; Instituto Argentino de Oceanografía
The Lotena Group is a clastic to evaporitic unit up to 650 m thick that accumulated during the Middle to Late Jurassic in the Neuquén Basin, western Argentina. Extensive field work carried out in the Sierra de la Vaca Muerta and Arroyo Covunco areas, including the measurement of seven detailed stratigraphic sections and geological mapping allow the discrimination of six unconformity-bounded units or sequences. [...]
2005 - 10.1344/105.000001400
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 107-118  
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4.
14 p, 911.6 KB High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): preliminary approach / Palma, R. M. (Universidad de Buenos Aires. Departamento de Ciencias Geológicas) ; Lo Forte, G. L. (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)) ; Medhli, M. (Université Ibn Tofail. Department de Geologie) ; Piethé, R. D. (Universidad de Buenos Aires. Departamento de Ciencias Geológicas)
The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassic carbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i. [...]
2005 - 10.1344/105.000001401
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 119-132  
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5.
13 p, 1.0 MB Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina) / Zavala, C. (Universidad Nacional del Sur. Departamento de Geología) ; Maretto, H. (Repsol YPF) ; Meglio, M. di (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina))
The Tordillo Formation is a continental clastic unit deposited in the Neuquén Basin during the Late Jurassic. This paper discusses the stratigraphy of the succession outcropping at the Quebrada del Sapo, with emphasis on the origin, dimensions and hierarchy of bounding surfaces of aeolian deposits. [...]
2005 - 10.1344/105.000001402
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 133-145  
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6.
8 p, 648.6 KB Chemostratigraphy of the Pliensbachian, Puesto Araya Formation (Neuquén Basin, Argentina) / Valencio, S. A. (Instituto de Geocronología y Geología Isotópica (INGEIS)) ; Cagnoni, M. C. (Instituto de Geocronología y Geología Isotópica (INGEIS)) ; Ramos, A. M. (Instituto de Geocronología y Geología Isotópica (INGEIS)) ; Riccardi, A. C. (Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo) ; Panarello, H. O. (Instituto de Geocronología y Geología Isotópica (INGEIS))
In a preliminary attempt to establish an isotope stratigraphy, strontium, carbon and oxygen isotope ratios were determined from marine biogenic carbonates of Pliensbachian age, in the context of scheme of local ammonite Zones correlatable to the European Standard Zonation. [...]
2005 - 10.1344/105.000001403
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 147-154  
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7.
7 p, 749.8 KB Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina / Lo Forte, G. L. (Universidad de Buenos Aires. Departamento de Ciencias Geológicas) ; Ortí, F. (Universitat de Barcelona. Departament de Geoquímica, Petrologia i Prospecció Geològica) ; Rosell, L. (Universitat de Barcelona. Departament de Geoquímica, Petrologia i Prospecció Geològica) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina)
Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study of strontium, oxygen and sulphur has been carried out in Ca-sulphate facies of Jurassic marine evaporates (Tábanos Formation and Auquilco Formation) outcropping in southern Mendoza, Aconcagua-Neuquén Basin (Argentina), as a part of a comprehensive sedimentologic study. [...]
2005 - 10.1344/105.000001404
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 155-161  
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8.
16 p, 795.1 KB Biofacies analysis of Hettangian-Sinemurian bivalve/brachiopod associations from the Neuquén Basin (Argentina) / Damborenea, S. E. (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Departamento de Paleontología de Invertebrados) ; Manceñido, M. O. (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Departamento de Paleontología de Invertebrados)
Based upon extensive sampling with strict stratigraphical control on Hettangian and Sinemurian deposits cropping out at the river Atuel region (southwest Mendoza Province), the presence of all bivalve and brachiopod genera was recorded. [...]
2005 - 10.1344/105.000001405
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 163-178  
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9.
6 p, 631.9 KB First teuthid cephalopod from the Lower Jurassic of South America (Neuquén Basin, Argentina) / Riccardi, A. C. (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Departamento de Paleozoología de Invertebrados)
A new species of squid, Teudopsis jeletzkyi n. sp. , is described from the Toarcian (Lower Jurassic) of the Los Molles Formation in Neuquen Province, central west Argentina. Fossil squids have thus far been unknown in the Mesozoic of South America. [...]
2005 - 10.1344/105.000001406
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 179-184  
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10.
19 p, 932.5 KB Heterochrony in Middle Jurassic species of Gryphaea (Ostreoidea, Gryphaeidae) from southern South America / Rubilar, A. (Servicio Nacional de Geología y Minería (Santiago de Chile). Sección Paleontología y Estratigrafía)
Morphological changes along ontogeny, based on size, are analysed in five species of Gryphaea from the Middle Jurassic of southern South America. Three of these taxa are new: G. apiculata n. sp. , G. [...]
2005 - 10.1344/105.000001407
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 185-203  
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11.
10 p, 740.9 KB Influence of a biohermal belt on the lacustrine sedimentation of the Cañadón Asfalto Formation (Upper Jurassic, Chubut province, Southern Argentina) / Cabaleri, N. G. (Universidad de Buenos Aires. Departamento de Ciencias Geológicas) ; Armella, C. (Instituto de Geocronología y Geología Isotópica-CONICET (Buenos Aires, Argentina))
The Upper Jurassic Cañadón Asfalto Formation (Cañadón Asfalto Basin, Patagonia Argentina), consists mainly of carbonate deposits accumulated in hydrologically closed lakes, which were especially sensitive to rainfall changes. [...]
2005 - 10.1344/105.000001408
Geologica acta, Vol. 3, Núm. 2 (2005) , p. 205-214  
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