Papers by Daniel G. Poiré
Minerals, May 21, 2024
The Neoproterozoic (>1160 to ~540 Ma) sedimentary record of the Tandilia System is reorganized in... more The Neoproterozoic (>1160 to ~540 Ma) sedimentary record of the Tandilia System is reorganized into eight depositional sequences based on a detailed review of published sources and new lithological observations. The main compositional attributes compiled from the studied units were used to indicate changes in lithology regarding their origin. Epiclastic sections reveal supply and sources changes through the succession. Basement detritus was dominant during the deposition of the basal sequences turning drastically to a volcanic affinity dominance. The carbonate sections, dominated by intra-basinal components, were deposited in periods of rare or restricted detrital input. The older, described as a cap-dolostone, was related to bio-induced dolomite precipitation under a deglacial to interglacial context. The younger, a carbonate ramp, reveals to have been built by microbial activity adding high levels of oxygen to seawater correlated to a global oxygenation event. Compositional changes recorded in the shallow marine deposits of Tandilia could have been intricately linked to periods of tectonic and paleo-relief configurations, favoring the detrital supply into the basin, followed by relevant episodic biogeochemical changes. This study shows that the basinal-components progression was controlled by paleoclimate and paleoenvironments associated to the extensive interval between the rupture of the Rodinia to Gondwana paleogeographical framework.
Brazilian Journal of Geology, 2024
The final consolidation of southwestern Gondwana during the Ediacaran-Cambrian resulted in the fo... more The final consolidation of southwestern Gondwana during the Ediacaran-Cambrian resulted in the formation of a large landmass originally surrounded by the newborn Panthalassic Ocean. The Río de la Plata Craton is one of the last pieces that complete the geotectonic puzzle along the austral part of this supercontinent. However, the sedimentary record corresponding to the interval between the consolidation of SW Gondwana until the initial deposition in a large Ordovician cratonic basin is apparently missing. In this context, the Ediacaran-Cambrian epiclastic shallow-marine ramp of the Cerro Negro Formation, the uppermost unit of La Providencia Group, Tandilia System, is envisaged as the first known stratigraphic record of the hidden pericratonic basins of Gondwana. Geochronological and provenance data, coupled with robust stratigraphic and sedimentologic background, support that this unit keeps more tectono-sedimentary affinity with the Ordovician Balcarce Formation than the Neoproterozoic Sierras Bayas Group. The presence of similar Neoproterozoic source areas for both units, the absence of any metamorphism and deformation related to the Brasiliano cycle, and shallow marine deposition strongly suggest that the paleogeography and physiography of the original southernmost continental platform of Gondwana were similar to the Ordovician ones. Thus, the Cerro Negro Formation appears as the missing link between the ultimate stages of the Brasiliano Orogenic Cycle and the final stabilization of the continental platform from the SW part of Gondwana.
Fluidization in insect constructions in soils
Ichnos, Aug 1, 2000
Fluidization, a special case of liquefaction, is a physical process occurring in unconsolidated, ... more Fluidization, a special case of liquefaction, is a physical process occurring in unconsolidated, water‐saturated, sediments that can be verified in insect constructions in soils. Behavioral analysis of the bees Ptilothrix relata and Diadasina distincta shows that the fine‐grained material of the soil pellets, utilized to construct the chimneys and cells of the nest, have been subjected to fluidization. The increment
Agrociencia Uruguay, May 27, 2022
A Daniel, mi compañero de vida, mi soporte y sostén, quien siempre estuvo para darme ánimos, leer... more A Daniel, mi compañero de vida, mi soporte y sostén, quien siempre estuvo para darme ánimos, leer el manuscrito y hacer las traducciones. Al G.D. Geología por su soporte y sus aportes durante todo este tiempo.
La formación Piedra Clavada en el área de Tres Lagos, provincia de Santa Cruz, Argentina
198471 Biblioteca Servicio Geológico Minero Argentino (SEGEMAR) Av. Julio A. Roca 651-9 P (1322) ... more 198471 Biblioteca Servicio Geológico Minero Argentino (SEGEMAR) Av. Julio A. Roca 651-9 P (1322) Ciudad de Buenos Aires-ARGENTINA--(5411) 4349-3200 (5411) 4349-3198 mjanit@ secind. mecon. gov. ar http://www. segemar. gov. ar
Gómez Peral, et al., 2014 Prec.Res
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Digitate Columnar Stromatolites from Proterozoic Dolostones of Gibraltar Formation, Mina Verdún Group, Uruguay
... Basically, digitate stromatolites have been described in modern intertidal environments in th... more ... Basically, digitate stromatolites have been described in modern intertidal environments in the Shark Bay, Australia (Logan et al., 1974), while the group Conophyton has been assigned as a deeper subtidal stromatolite by Poiré (1987, 2002) based on Precambrian stromatolite ...
Estudios de detalle realizados en el area de las Sierras Bayas, partido de Olavarria, provincia d... more Estudios de detalle realizados en el area de las Sierras Bayas, partido de Olavarria, provincia de BuenosAires, han puesto en evidencia una importante discordancia erosiva entre el Grupo Sierras Bayas y la FormacionCerro Negro.Favorecido por el avance en las explotaciones de caliza, se ha podido verificar que esta superficie discordante tieneextension regional, ya que se la ha reconocido en los tres nucleos que conforman estas sierras.Se deduce que una vez depositadas las calizas de la Formacion Loma Negra, se produjo un relira del mar que posibilitola accion de fenomenos de disolucion en las sedimentitas carbonalicas, la generacion de un deposito arcillosoresidual y la conformacion de una paleosuperficie irregular de naturaleza karstica. En las areas deprimidas de estepaleorelieve se acumularon brechas de talud y depositos de ftanita.Con posterioridad acaccio un evento transgresivo, iniciandose un nuevo ciclo sedimentario (Formacion Cerro Negro).Las sedimentitas de este ciclo, en su parte basal, estan caracterizadas por calizas de grano fino y pelitas (predominantementeiUlitico-cloriiticas, con interestratificado clorita-monimonillonita) de coloraciones rojizas, en estratosfinos a muy finos y con estructuras onduliticas.
Intersecciones en antropología, 2009
Grinding tools frequently comprise great volumes of rocks transported to the archaeological sites... more Grinding tools frequently comprise great volumes of rocks transported to the archaeological sites of the Interserrana area of Buenos Aires Province. The results from thin section and X-ray diffraction analyses of a sample of grinding artifacts manufactured from sedimentary and metamorphic raw material are presented in this paper in the context of recent systematic studies in relation to these tools. In addition, characteristics of blanks and weights of part of the sample studied are considered. These data are discussed in relation to provenience and exploitation strategies of the lithic raw material used for grinding tools. The use of rocks available on the Pampean ranges of Tandilia and Ventania and minor outcrops in the Interserrana area were identifi ed for the studied assemblages. The transport of these raw materials implied different procurements efforts (of local, middle and long distance). The rocks selected for the production of grinding tools had the petrographic characteristic of a high abrasive capacity. In some cases,
Seawater and Chromium Isotopes - a Link to Atmospheric Weathering on Land?
AGUFM, Dec 1, 2013
Journal of South American Earth Sciences, Dec 1, 2020
Abstract Representative rock-magnetic experiments and petrographic studies on remagnetized limest... more Abstract Representative rock-magnetic experiments and petrographic studies on remagnetized limestones and dolostones from the Upper Cambrian La Flecha Formation (Quebrada La Angostura, Precordillera of La Rioja, Argentina) carrying a pre-tectonic Permo-Triassic secondary magnetization are reported in order to improve the understanding of the pervasive Sanrafaelic overprint that reset the palaeomagnetic record of most of the Early Cambrian to Mid-Ordovician units of the Argentine Precordillera and the San Rafael Block. The main carrier of the remagnetization is determined as fine-grained magnetite of chemical origin, though three additional ferromagnetic phases were identified (pyrrhotite, hematite and goethite). A power-law model fitted to hysteresis ratio data (Mrs/Ms vs. Bcr/Bc) defined an almost identical trend as that of the limestones from the Middle-Ordovician Ponon Trehue Formation (San Rafael Block, Mendoza province, Argentina) which were affected by the same regional event. Magnetic fabrics revealed by anisotropy of magnetic susceptibility and of anhysteretic remanence show mostly a pre-tectonic origin and, in some cases, a secondary overprint probably related to recent formation of magnetic minerals.
Latin American journal of sedimentology and basin analysis, Dec 1, 2008
Three different clay mineral assemblages are detected in mud-sandy bottom sediments of the Paraná... more Three different clay mineral assemblages are detected in mud-sandy bottom sediments of the Paraná Basin of Argentina. A dominant Kaolinite association, with sources areas in the Upper Amazon, northeast of the study area and within the Brazilian Shield (also with subordinated crystalline Illite); an Illitic-Smectitic and Interlayer I/S association, from the Andean Cordillera and the Chaco Plains in the northwest and mainly represented by the Bermejo and Pilcomayo Rivers; a southern Illitic-Chlorite dominant, but with lower crystallinity index than in the northern area, whose source is in the Pampean Plains to the west of Argentina. Mixed layer clays (Illite/Smectite) were also detected in this southern sector. These clay mineral associations reflect not only the climate but the source rock composition in these three main geographical areas. The tributaries of the lower Paraná River Basin show a dominant Illitic-Smectitic clay mineral association that has been eroded and transported from the Pampean Plains. In this contribution, three main clay mineral associations (Illite-Chlorite, Smectite-I/S, and Kaolinite) in stream sediments of the Paraná River and tributaries within a wide area of Argentina are described and their provenance is interpreted on the basis of controlling factors, climate and provenance.
Ichnos, 1992
... The full list of Lower Cambrian forms is: Archaeonassa, Arenicolites, Arthrophycus, Asteriaci... more ... The full list of Lower Cambrian forms is: Archaeonassa, Arenicolites, Arthrophycus, Asteriacites, Asterichnus*, Astropolichnus, Aulichnites, Belorhaphe, Bergaueria, Bilin-ichnus, Brooksella, Buthotrephis, Chomatichnus*, Chon-drites, Circulichnis*, Cochlichnus, Conichnus ...
Publicación electrónica de la Asociación Paleontológica Argentina., 2022
The fossil record of Cretaceous turtles in Santa Cruz Province is scarce. Turtles have been repor... more The fossil record of Cretaceous turtles in Santa Cruz Province is scarce. Turtles have been reported from the Mata Amarilla Formation (Cenomanian), the Cerro Fortaleza Formation (Campanian-Maastrichtian), and the Chorrillo Formation (early Maastrichtian). In this contribution, we examined all the turtle remains recovered from six localities in the Mata Amarilla Formation, nearby Mata Amarilla farm (Santa Cruz Province, Argentina). These fossils are housed at the "Padre Molina" Museum in Río Gallegos, Santa Cruz. Most of the carapace and plastral remains are conferred to an indeterminate small species of cf. Prochelidella sp., while the remaining fragments are attributed to a mid-sized species of an indeterminate Chelidae. Prochelidella spp. is a group of turtles distributed in Chubut, Río Negro, Neuquén, and Mendoza provinces, ranging from the Aptian to the Maastrichtian, with two main gaps (late Albian and Coniacian-Santonian). The recognition of cf. Prochelidella sp. in the Austral-Magallanes Basin extends the geographic range of this group more than 500 km south to the previously known southernmost record of Prochelidella, Pr. argentinae, from the Golfo San Jorge Basin (Chubut, Argentina).
Abstract: Trace Fossil Shallowing-Upwards Stacking Pattern of High-Order Progradational Sequences: An Example from the Cretaceous-Tertiary of Western Patagonia, Argentina
AAPG Bulletin, 1998
ABSTRACT: Gyrochorte as Trace Fossil Indicator of Storm Events in the Neuquén Basin, Argentina
AAPG Bulletin, 2001
Latin American journal of sedimentology and basin analysis, Jan 12, 2018
The Maastrichtian shallow marine deposits exposed at the south margin of the Lago Argentino withi... more The Maastrichtian shallow marine deposits exposed at the south margin of the Lago Argentino within the Austral-Magallanes Basin are known as the Calafate Formation. In order to interpret the depositional systems and reconstruct the sequence stratigraphic architecture for this unit at its type locality (Cerro Calafate), we acquire new data from seven stratigraphic sections. We recognized six facies associations (FA-1 to FA-6) corresponding to shallow marine deposits, which are organized vertically displaying a transition from shallower to deeper conditions, representing a ~90 m thick transgressive succession. The Calafate Formation deposits are differentiated into a lower wave-dominated coast (FA1, FA2 and FA3) and an upper tide-dominated coast (FA4, FA5 and FA6), each marked by the dominance of wave and tidal sedimentary processes, respectively. The Calafate Formation overlies the fluvial deposits of the Chorrillo Formation by a transgressive surface (TS), which is overlaid by a transgressive marine succession characterized by a retrogradational stacking pattern. The latter is finally covered by offshore transition marine deposits marking a progressive deepening of the depositional system that culminates with the maximum flooding surface (MFS). From here, an aggradational stacking pattern dominates the upper sandstones of the unit representing the highstand systems tract (HST), which is interpreted to be the cause of short-term periods when the accommodation space rate was nearly equaled to the sediment supply rate during the Maastrichtian.
Revista del Museo Argentino de Ciencias Naturales nueva serie, 2008
Palynological data on Piedra Clavada Formación (Albian) from its type area, Santa Cruz Province, ... more Palynological data on Piedra Clavada Formación (Albian) from its type area, Santa Cruz Province, Argentina. Two sections from the type area where Piedra Clavada Formación is found yielded pollen assemblages in which 70 palynomorphs have been determined, including Bryophytes/Pteridophytes, Gymnosperms, Angiosperms and terrestrial plancton. Few and badly preserved marine dinoflagellates confirm the close influence of sea shore in a delta environement that dominate both sections. These assemblages are similar to those from La Horqueta locality where the basal section of Piedra Clavada Formación includes ammonites of Early Albian age. The two sections studied so far in the type area are composed of slightly younger deposits that are covered by the Late Cretaceous Mata Amarilla Formación. The similarity of assemblages suggests that they correspond to the same paleofloristic episode and could be united into one biozone in the near future. Comparisons with assemblages found in the Kachaike Formación, based on presently available data, also show similarities with Piedra Clavada palynological content, however with slight differences that point to its younger age (Early to mid Albian), as suggested by dinoflagellate studies. Comparisons with aptian units found in the same area (Río Mayer Formación) and in neighbouring basins (Baqueró Basin and Golfo San Jorge Basin) are briefly considered. Finally, the importance of primitive angiosperm sporomorphs is pondered in regard to their variety and biostratigraphic significance.
Geology and tectonic magmatic of emplacement of a longitudinal dyke swarm of Nico Perez(Minas) URUGUAY
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Papers by Daniel G. Poiré