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Registros recuperados: 32
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A 5.3‐million‐year history of monsoonal precipitation in northwestern Australia ArchiMer
Stuut, Jan‐berend W.; De Deckker, Patrick; Saavedra‐pellitero, Mariem; Bassinot, Franck; Drury, Anna‐joy; Walczak, Maureen H.; Nagashima, Kana; Murayama, Masafumi.
New proxy records from deep‐sea sediment cores from the northwestern continental margin of Western Australian reveal a 5.3 million‐year (Ma) history of aridity and tropical‐monsoon activity in northwestern Australia. Following the warm and dry early Pliocene (~5.3 Ma), the northwestern Australian continent experienced a gradual increase in humidity peaking at about 3.8 Ma with higher than present‐day rainfall. Between 3.8 and about 2.8 Ma, climate became progressively more arid with more rainfall variability. Coinciding with the onset of the northern hemisphere glaciations and the intensification of the northern hemisphere monsoon, aridity continued to increase overall from 2.8 Ma until today, with greater variance in precipitation and an increased...
Tipo: Text Palavras-chave: Paleoclimate; Monsoon; Australia; Runoff; Pliocene; Quaternary.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00502/61384/65035.pdf
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A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil Anais da ABC (AABC)
Dillenburg,Sérgio R.; Esteves,Luciana S.; Tomazelli,Luiz J..
Evidences of coastal erosion in Rio Grande do Sul have been obtained by three methods: (a) analysis of the long-term morphodynamics and stratigraphy of coastal barriers, (b) annual shoreline mapping using the Differential Global Positioning System (DGPS), and (c) local beach profile measurements. The first method reflects coastal erosion as continuity of the geological evolution in the last 5 ka, taking place mainly along the southern half of gentle coastal projections. The second method represents a shorter temporal scale and indicates that approximately 80% of the coast is eroding. Beach profiling has been measured in very few places that are distant from each other since the early 1990s; consequently, their results reflect local and very short time...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal evolution; Quaternary; Shoreline changes; Coastal barriers; Sediment budget.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300014
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Controls on Holocene denudation rates in mountainous environments under Mediterranean climate ArchiMer
Molliex, S.; Jouet, Gwenael; Freslon, Nicolas; Bourles, D. L.; Authemayou, C.; Moreau, Julien; Rabineau, Marina.
The Mediterranean domain is characterized by a specific climate resulting from the close interplay between atmospheric and marine processes and strongly differentiated regional topographies. Corsica Island, a mountainous area located in the western part of the Mediterranean Sea is particularly suitable to quantify regional denudation rates in the framework of a source-to-sink approach. Indeed, fluvial sedimentation in East-Corsica margin is almost exclusively limited to its alluvial plain and offshore domain and its basement is mainly constituted of quartz-rich crystalline rocks allowing cosmogenic nuclide Be-10 measurements. In this paper, Holocene denudation rates of catchments from the eastern part of the island of Corsica are quantified relying on in...
Tipo: Text Palavras-chave: Be-10-derived denudation rates; Schmidt Hammer; Quaternary; Quantitative geomorphology; Weathering.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00380/49082/49655.pdf
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Cycles sédimentaires dans le système turbiditique du Congo : nature et origine ArchiMer
Picot, Marie.
Turbidite systems are huge submarine sedimentary fans located off rivers, at the foot of the continental slope. They constitute the most distal terrigeneous deposits of a fluvial system. Their internal structure, defined as a stacking of channel-levee systems, show architectural changes through time. Forcing factors of these architectural changesare still poorly understood, and the respective role of internal (related to the own functioning of the system) or external forcing factors (climate, seal-level variations, tectonics) remains debated. To better understand the role of these controlling factors, a detailed study of the Congo system architecture was carried out. This study was conducted as part of the Reprezaï research project (Ifremer/IUEM, since...
Tipo: Text Palavras-chave: Système turbiditique; Congo; Quaternaire terminal; Cycles sédimentaires; Progradation et rétrogradation; Avulsion; Lobes; Paléoclimat; Sismique; Carottes sédimentaires; Turbidite system; Congo; Quaternary; Sedimentary cycles; Progradation; Retrogradation; Avulsion; Lobes; Paleoclimate; Geophysical data; Sedimentary cores Thèse.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00312/42275/41599.pdf
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Development patterns of fringing and barrier reefs in New Caledonia (southwest Pacific) ArchiMer
Cabioch, G; Correge, T; Turpin, L; Castellaro, C; Recy, J.
In New Caledonia, core data indicate that the fringing reefs grew during the last interglacial and the Holocene, while the barrier reefs developed during several high sea level stands of the Quaternary. These growth periods are archived in a 128-m-long core from Ilot Amedee, offshore of Noumea. Directly upon the peridotitic substrate (reached at 126.50 m), a basal unit comprising abundant rhodoliths, molluscs and rare corals is characteristic of the pioneer stage of barrier reef development. Above it, a severely calcitized unit contains corals, molluscs and abundant micritic levels. Then, a sequence punctuated by several minor discontinuities and by a downward increase in diagenetic alteration is found. At 47 m core depth, a unit, which is thought to be...
Tipo: Text Palavras-chave: Croissance récifale; Néotectonique; Nouvelle-Calédonie; Quaternaire; Reef growth; Neotectonics; New Caledonia; Quaternary.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43582/44021.pdf
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Didelphidae marsupials (Mammalia, Didelphimorphia) from the Late Pleistocene deposit of the Gruta dos Moura Cave, northern Brazil Anais da ABC (AABC)
Nova,Patricia Villa; Avilla,Leonardo S.; Oliveira,Édison V..
The present study acknowledges the diversity of fossil marsupials from the Gruta dos Moura cave, as well as environmental and climatic aspects during the Quaternary. The results show that this is the largest diversity of Pleistocene marsupials recorded in a single cave: Didelphis albiventris, D. aurita, Gracilinanus agilis, G. microtarsus, Marmosa murina, Monodelphis brevicaudata, M. domesticaand Sairadelphys tocantinensis. Furthermore, the described specimens are also part of the only fossil assemblage unequivocally referable to the late Pleistocene. Paleontological studies suggest an intimate association with dry and open environments with high abundance of water sources. Since most of the identified taxa are characteristic of open forests and gallery...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mammals; Didelphidae; Marsupials; Northern Brazil; Quaternary; Late Pleistocene.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100193
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FIRST RECORD OF THE NEOLICAPHRIUM RECENS FRENGUELLI, 1921 (MAMMALIA, LITOPTERNA) IN THE PLEISTOCENE OF SANTIAGO DEL ESTERO PROVINCE, ARGENTINA Pap. Avulsos de Zool. (São Paulo)
GAUDIOSO,PABLO J.; GASPARINI,GERMÁN M.; HERBST,RAFAEL; BARQUEZ,RUBÉN M..
ABSTRACT The first record of the Neolicaphrium recens Frenguelli, 1921 (Mammalia, Litopterna) from Pleistocene deposits of the Río Dulce, Rio Hondo Department, Santiago del Estero Province, Argentina, is reported. The morphology and morphometry observed in the specimen MPAT073 is coincident with the diagnostic characteristics of that species. This finding represents the northernmost and westernmost record of the species, and thus extends its geographical distribution. Geological data suggest that the material comes from a still unnamed Pleistocene stratigraphic unit.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Proteroteridae; Termas de Río Hondo; Northwestern Argentina; Río Dulce; Quaternary.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492017000300023
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Fossil record of the Andean rat, Andinomys edax (Rodentia: Cricetidae), in Argentina Mastozool. neotrop.
Ortiz,Pablo E.; Jayat,J. Pablo.
Andinomys edax (Rodentia, Cricetidae) has a broad distribution in the Central Andean region. The fossil record is restricted to only three localities from Lower-Middle Pleistocene in Bolivia to Upper Holocene in Argentina. Recent field work in northwestern Argentina produced five new paleontological localities: Las Juntas, Catamarca (13.4 - 12.95 kyr BP); Inca Cueva 4, Jujuy (11 - 9 kyr BP); Tafí del Valle, Tucumán (10.25 - 9.75 kyr BP); Los Viscos, Catamarca (1.88 kyr bp); and La Cueva, Jujuy (0.95 kyr BP). The paleontological data indicate that A. edax has been a ubiquitous sigmodontine in northwestern Argentina since the Upper Pleistocene.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Northwestern Argentina; Paleontological record; Quaternary.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832007000100010
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Geochemical provenance of sediments from the northern East China Sea document a gradual migration of the Asian Monsoon belt over the past 400,000 years ArchiMer
Beny, Francois; Toucanne, Samuel; Skonieczny, Charlotte; Bayon, Germain; Ziegler, Martin.
The reconstruction of the long-term evolution of the East Asian Monsoon remains controversial. In this study, we aim to give a new outlook on this evolution by studying a 400 kyr long sediment record (U1429) from the northern East China Sea recovered during IODP Expedition 346. Neodymium isotopic ratios and rare earth element concentrations of different grain-size fractions reveal significant provenance changes of the sediments in the East China Sea between East Asian continental sources (mainly Yellow River) and sediment contributions from the Japanese Archipelago. These provenance changes are interpreted as the direct impact of sea level changes, due to the reorganization of East Asian river mouth locations and ocean circulation on the East China Sea...
Tipo: Text Palavras-chave: Monsoon; Eastern Asia; East China sea; Quaternary; Radiogenic isotopes; Neodymium; Rare earth elements.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00439/55088/56791.pdf
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Interglacials of the last 800,000 years ArchiMer
Berger, A.; Crucifix, M.; Hodell, D. A.; Mangili, C.; Mcmanus, J. F.; Otto-bliesner, B.; Pol, K.; Raynaud, D.; Skinner, L. C.; Tzedakis, P. C.; Wolff, E. W.; Yin, Q. Z.; Abe-ouchi, A.; Barbante, C.; Brovkin, V.; Cacho, I.; Capron, E.; Ferretti, P.; Ganopolski, A.; Grimalt, J. O.; Hoenisch, B.; Kawamura, K.; Landais, A.; Margari, V.; Martrat, B.; Masson-delmotte, V.; Mokeddem, Zohra; Parrenin, F.; Prokopenko, A. A.; Rashid, H.; Schulz, M.; Riveiros, N. Vazquez.
Interglacials, including the present (Holocene) period, are warm, low land ice extent (high sea level), end-members of glacial cycles. Based on a sea level definition, we identify eleven interglacials in the last 800,000years, a result that is robust to alternative definitions. Data compilations suggest that despite spatial heterogeneity, Marine Isotope Stages (MIS) 5e (last interglacial) and 11c (similar to 400ka ago) were globally strong (warm), while MIS 13a (similar to 500ka ago) was cool at many locations. A step change in strength of interglacials at 450ka is apparent only in atmospheric CO2 and in Antarctic and deep ocean temperature. The onset of an interglacial (glacial termination) seems to require a reducing precession parameter (increasing...
Tipo: Text Palavras-chave: Interglacials; Review; Quaternary.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00340/45150/44547.pdf
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La Isla Santa Clara, testigo morfoestructural de la evolución geodinámica plio-cuaternaria y actual del Golfo de Guayaquil. OceanDocs
Santana, E.; Dumont, J.F..
Este contexto estratigráfico y estructural, hace que la Isla Santa Clara sea un testigo directo de los eventos neotectónicos del Golfo de Guayaquil. El estudio realizado en la Isla Santa Clara se ha desarrollado bajo dos objetivos: 1. Obtener datos detallados de la evolución temprana y actual de la Isla, en base a nuevos datos de estratigrafía y morfología, 2. Encuadrar la evolución de la Isla dentro del contexto sismotectónico y estructural del Golfo de Guayaquil, a fin de precisar la localización de las fallas potencialmente activas.
Tipo: Journal Contribution Palavras-chave: Stratigraphy; Structural geology; Tectonophysics; Quaternary; Bathymetric data; Oceanic islands; Stratigraphy; Http://aims.fao.org/aos/agrovoc/c_7440.
Ano: 2000 URL: http://hdl.handle.net/1834/2259
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Late Holocene paleoenvironments of the floodplain of the Solimões River, Central Amazonia, based on the palynological record of Lake Cabaliana Acta Botanica
Sá,Natália de Paula; Absy,Maria Lúcia; Soares,Emílio Alberto Amaral.
ABSTRACT The core PD-67 of 160 cm depth was collected from the delta of Lake Cabaliana situated on the Solimões River. Seventeen samples were removed for palynological and sedimentological analysis and three for radiocarbon analysis. Two dry periods, both in the Late Holocene, were observed (2800-2550 cal yr BP, 1450-550 cal yr BP) separated by a wetter phase (2550-1450 cal yr BP). In 2800-2550 cal yr BP, varzea forests of Alchornea, Symmeria, Cecropia, Alternanthera and Asteraceae were predominant. Beginning in 2,550-1450 cal yr BP, the varzea was characterized by pioneer elements, such as Cassia, Laetia, Mabea, Symmeria and Cecropia, and by the expansion of Poaceae, Cyperaceae, Sagittaria, Montrichardia and Asteraceae. In 1450-550 cal yr BP the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon; Pollen; Quaternary; Rainfall; Terra firme forest.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300473
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Late Pleistocene echimyid rodents (Rodentia, Hystricognathi) from northern Brazil Anais da ABC (AABC)
FERREIRA,THAIS M.F.; OLIVARES,ADRIANA ITATI; KERBER,LEONARDO; DUTRA,RODRIGO P.; AVILLA,LEONARDO S..
ABSTRACT Echimyidae (spiny rats, tree rats and the coypu) is the most diverse family of extant South American hystricognath rodents (caviomorphs). Today, they live in tropical forests (Amazonian, coastal and Andean forests), occasionally in more open xeric habitats in the Cerrado and Caatinga of northern South America, and open areas across the southern portion of the continent (Myocastor). The Quaternary fossil record of this family remains poorly studied. Here, we describe the fossil echimyids found in karst deposits from southern Tocantins, northern Brazil. The analyzed specimens are assigned to Thrichomys sp., Makalata cf. didelphoides and Proechimys sp. This is the first time that a fossil of Makalata is reported. The Pleistocene record of echimyids...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caviomorphs; Echimyidae; Fossil record; Quaternary; South America.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300829
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Late Pleistocene evolution of the mixed siliciclastic and carbonate southwestern New Caledonia continental shelf/lagoon ArchiMer
Le Roy, Pascal; Jorry, Stephan; Jouet, Gwenael; Ehrhold, Axel; Michel, Guillaume; Gautier, Valentin; Guerin, Charline.
The main island of New Caledonia (NC) is surrounded by the second largest barrier reef in the world after the Australian Great Barrier Reef. The Upper Pleistocene evolution of this barrier reef–lagoon complex offers the opportunity to examine the response of a modern mixed tropical siliciclastic/carbonate system to relative sea-level changes and to better constrain the relative role of lagoon backfilling and paleo-drainage system in sediment transfer across the shelf. This paper mainly focuses on the results of chronostratigraphic and sedimentological interpretations of new seismic, bathymetric and coring data collected in the SW NC lagoon. Several significant points are highlighted from this study and allow the construction of a refined model which...
Tipo: Text Palavras-chave: Seismic stratigraphy; Quaternary; Incised valleys.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00461/57289/59362.pdf
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Late Quaternary drainage dynamics in northern Brazil based on the study of a large paleochannel from southwestern Marajó Island Anais da ABC (AABC)
Rossetti,Dilce F.; Góes,Ana M..
Marajó Island shows an abundance of paleochannels easily mapped in its eastern portion, where vegetation consists mostly of savannas. SRTM data make possible to recognize paleochannels also in western Marajó, even considering the dense forest cover. A well preserved paleodrainage network from the adjacency of the town of Breves (southwestern Marajó Island) was investigated in this work combining remote sensing and sedimentological studies. The palimpsest drainage system consists of a large meander connected to narrower tributaries. Sedimentological studies revealed mostly sharp-based, fining upward sands for the channelized features, and interbedded muds and sands for floodplain areas. The sedimentary structures and facies successions are in perfect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Remote sensing; Sedimentology; Paleochannel; Marajó Island; Quaternary.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300017
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Limestone caves and the Quaternary record of terrestrial tetrapods on islands Naturalis
McFarlane, D.A..
The potential for finding Quaternary tetrapod fossils on islands is governed by issues of biodiversity, geology, fossil preservation and timespan of records.
Tipo: Article / Letter to the editor Palavras-chave: Limestone caves; Quaternary; Terrestrial tetrapods; Islands; Biodiversity; Geology; Fossil preservation; 38.22.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/428271
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Lithologie des délestages glaciaires (niveaux de Heinrich) de l'Eperon de Goban (Atlantique Nord-Est) ArchiMer
Van Rooij, David.
Goban Spur is a marginal plateau, 250 km SW of Ireland, with the Celtic Margin on its eastern side and Porcupine Seabight Basin on its northern side. A set of NNE-SSW trending escarpments separate the upper part of Goban Spur from the Porcupine Abyssal Plain. We have studied a transect of Kullenberg cores taken during the 1984 Norestlante 2 campaign. Biostratigraphical and sedimentological (carbonate content) analyses were carried out by Müller [1986] and Foucault [1987]. All cores were accurately cleaned and described before digital photographs were taken in order to obtain grey level profiles and an estimate of the coarse grain size fraction (> 150 µm). Magnetic susceptibility and gamma density measurements were obtained using a GEOTEK Multi Sensor...
Tipo: Text Palavras-chave: Goban Spur; Quaternaire; Sédiments; Délestages glaciaires; IRD; Turbidites; Niveau de Heinrich; Calotte glaciaire.; Goban Spur; Quaternary; Sediments; IRD; Turbidites; Heinrich Layer; Heinrich Event; Ice Sheet..
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00412/52317/53096.pdf
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Morphology and sedimentology of the Itaipú Embayment - Niterói/RJ Anais da ABC (AABC)
SALVADOR,MARCUS VINICIUS S.; SILVA,MARIA AUGUSTA M. DA.
Bathymetric and sedimentological data from water depths between 3 and 28 meters are the basis of a detailed bathymetric map of the Itaipú Embayment and an understanding of its sedimentary dynamics. Shallower than 16 meters the contours are parallel to the shoreline whereas the morphology of the deeper bottom is influenced by the Menina, Mãe, and Pai islands. Medium sand is prevalent, with local variations in more protected or less protected areas. Minor amount of black mud possibly derives from the Itaipú Lagoon. Siliciclastic granules and pebbles may be relict. The Itaipú Embayment’s bottom morphology is controlled by stormy waves and the calmer easternmost part of the embayment presents a tendency to accumulate finer sediments.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal dynamics; Coastal sedimentation; Geomorphology; Quaternary.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100009
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Neotectonics in Marajó Island, State of Pará (Brazil) revealed by vertical electric sounding integrated with remote sensing and geological data Anais da ABC (AABC)
SOUZA,LENA S.B.; ROSSETTI,DILCE F.; ELIAS,VAGNER R.; PRADO,RENATO L..
Studies suggest that the Marajó Island has experienced neotectonic activity during its latest evolution. However, there are no data demonstrating the presence of tectonic structures in its shallow subsurface. This work integrates vertical electric sounding, morphostructural lineaments, and geological data aiming to show fault control on the Late Pleistocene-Holocene sedimentation of this area. Resistivity values were related to mud (< 90 Ωm), clayey sand (90 and 200 Ωm), sand (200 and 500 Ωm), as well as Fe-bearing sand and laterite (> 500 Ωm). The latest values were related to the unconformity with lateritic paleosol at the top of the Barreiras Formation. Despite the values ≤ 500 Ωm of both the Barreiras Formation and the Late Pleistocene-Holocene...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vertical electric sounding; Faults; Quaternary; Marajó Island; Remote sensing.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100073
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OSL age determinations of Pleistocene fluvial deposits in Central Amazonia Anais da ABC (AABC)
Soares,Emílio A.A.; Tatumi,Sonia H.; Riccomini,Claudio.
Absolute dating methods have been used in chronological studies of geological processes and sedimentary units of Quaternary age in Central Amazonia, Brazil. Although radiocarbon dating has been very useful in archaeological research and soil studies, the temporal interval of this method is inefficient in evaluating the sedimentation aspects and geological events from the beginning of the Quaternary in the Amazon basin. The use of crystal luminescence dating has been one of the most promising tool for determining the absolute dating of Quaternary deposits in the Amazonian region. Optically stimulated luminescence (OSL) dating, following the MAR and SAR protocols, in a tectonic-sedimentary study of Quaternary fluvial deposits in the confluence area of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crystal luminescence dating; Quaternary; Fluvial terraces; Central Amazonia.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300017
Registros recuperados: 32
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