Consulta: subjectFacets:"Tectonics"
Registros recuperados: 18
Data/hora: 06/06/2024 02:30:40

Tectonics at the axis of the very slow spreading Southwest Indian Ridge: Insights from TOBI side-scan sonar imagery
Provedor de dados: 5
Autores: Gomez, O; Briais, Anne; Sauter, D; Mendel, V.
We present the analysis of the deformation in the axial valley of two contrasted regions of the very slow spreading Southwest Indian Ridge based on side-scan sonar images. Our objective is to investigate how the obliquity is accommodated along the system. We show that the robust magmatic segments have axial valleys and major faults subperpendicular to spreading. The other sections show fault populations with various degrees of obliquity, often arranged in left-stepping echelons, accommodating part of the strike-slip deformation. Side-scan sonar reveals the presence of a corrugated surface near 59 degrees E interpreted to be an incipient detachment fault. We show that the large width of the SWIR oblique sections, and the difference in tectonic style between...
Tipo: Text
Palavras-chave: Mid-ocean ridges; Side-scan sonar; Tectonics; Discontinuities.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34567/33236.pdf

Structural controls on polyphase hydrothermal dolomitization in the Kinta Valley, Malaysia: Paragenesis and regional tectono-magmatism
Provedor de dados: 5
Autores: Ramkumar, Mu; Siddiqui, Numair Ahmed; Mathew, Manoj; Sautter, Benjamin; Hui, Poon Xin; Nagarajan, R.; Breitfeld, H. Tim; Santosh, M.; Menier, David; Poppelreiter, Michael.
In the eastern side of the Malay Peninsula, thick successions of limestone formations preserve important records of the Mesozoic and Cenozoic tectonic events. Here we investigate the strata- and fracture-bound hydrothermal dolomites in the Palaeozoic carbonates of the Kinta Valley, western Peninsular Malaysia. Based on their textural and morphologic characteristics, structural relationships with the host rock, different facies types, and associations with hydrothermal calcite and low-grade metamorphic marble, we attempt to trace their polyphase origin and relationship with thereto-tectonic events of the region. A detailed evaluation of the nature of brecciation and crystallization of polyphase dolomites, dolomitic limestones, limestones and marble, under...
Tipo: Text
Palavras-chave: Hydrothermal dolomite; Tectonics; Magmatism; Paragenesis; Structural evolution; Malaysia.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00637/74938/83485.pdf

Tectonic and sedimentary controls on widespread gas emissions in the Sea of Marmara: Results from systematic, shipborne multibeam echo sounder water column imaging
Provedor de dados: 5
Autores: Dupre, Stephanie; Scalabrin, Carla; Grall, Celine; Augustin, Jean-marie; Henry, Pierre; Sengor, A. M. Celal; Goeruer, Naci; Cagatay, M. Namik; Geli, Louis.
Understanding of the evolution of fluid-fault interactions during earthquake cycles is a challenge that acoustic gas emission studies can contribute. A survey of the Sea of Marmara using a shipborne, multibeam echo sounder, with water column records, provided an accurate spatial distribution of offshore seeps. Gas emissions are spatially controlled by a combination of factors, including fault and fracture networks in connection to the Main Marmara Fault system and inherited faults, the nature and thickness of sediments (e.g., occurrence of impermeable or gas-bearing sediments and landslides), and the connectivity between the seafloor and gas sources, particularly in relation to the Eocene Thrace Basin. The relationship between seepage and fault activity is...
Tipo: Text
Palavras-chave: Fluid emissions; Gas; Water column acoustics; Multibeam echo sounder; Sea of Marmara; Tectonics.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00268/37972/36049.pdf

Geological sampling in deep water: A new instrument is necessary.
Provedor de dados: 5
Autores: Girardeau, J; Auzende, Jean-marie; Boillot, G.
The Nautile submersible is used to observe the underwater geological structures and to conduct geological sampling in deep water. But it is not sufficient because it is not possible to measure the faults in the oceanic rifts.
Tipo: Text
Palavras-chave: Faults; Palaeomagnetism; Tectonics; Submersibles; Surveying underwater; Surveys; Seafloor sampling; Marine technology; Deep water.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1154.pdf

Evolution of the Glorieuses seamount in the SW Indian Ocean and surrounding deep Somali Basin since the Cretaceous
Provedor de dados: 5
Autores: Leroux, Estelle; Counts, J.; Jorry, Stephan; Jouet, Gwenael; Révillon, Sidonie; Boudagher-fadel, M.k.; Courgeon, S.; Berthod, C.; Ruffet, G.; Bachèlery, P.; Grenard-grand, E.
Little is known about the geological history of the Glorieuses seamount including basic information about its age and origin related to the regional evolution of the southern tip of the Somali Basin. This study focused on describing and reconstructing the long-term stratigraphic evolution of the Glorieuses seamount (SW Indian Ocean) to identify the mechanisms that have occurred through time to finally shape the emerged modern islands. Distinct terrace levels, currently submerged along the flanks of the seamount and surrounding seamounts, have already been interpreted as resulting from successive carbonate development and back-stepping episodes over the last 62 Myr. New isotopic and biostratigraphic dating on the flanks of the seamount, coupled with...
Tipo: Text
Palavras-chave: Glorieuses seamount; Somali Basin; Seismic stratigraphy; Tectonics; Vertical movement (uplift and subsidence); Volcanism; Shallow-water carbonate platform; Ar-40/Ar-39.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/73965/73324.pdf

Misinterpreting by localism: transposing European geology and tectonics onto Antillean islands
Provedor de dados: 16
Autores: Donovan, S.K.
Le Grand (1988, pp. 80-81, 97) defined ‘localism’ “when geologists are most influenced by data found close to them in time and space and within their own disciplinary specialties”. Jamaica has been prone to localist interpretations made by some of its most notable geologists.
Tipo: Article / Letter to the editor
Palavras-chave: Localism; Tectonics; Geology; Jamaica; Antilles; 38.36; 38.10.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/428047

The Paleogene Richmond Formation of Jamaica: Not an impact-related succession
Provedor de dados: 16
Autores: Donovan, S.K.; Pickerill, R.K.
James speculated that Paleogene ‘flysch-wildflysch’ deposits of the Caribbean region may all have a related genesis associated with one or more bolide impacts. The principal arguments used to promote this idea were: (1) that many successions may have been dated incorrectly and are actually related to the end Cretaceous (K/T) event and/or other bolide impacts; and (2) common olistostromes may have been transported by impact-related phenomena. The deposits discussed by James included the Richmond and Font Hill formations of Jamaica. The Richmond Formation of the Wagwater Belt is Paleogene, not Cretaceous, and olistostromic blocks are a common feature of the sedimentary succession of Jamaica. No extraterrestrial event need be invoked to support their...
Tipo: Article / Letter to the editor
Palavras-chave: Jamaica; Paleogene; Richmond Formation; Tectonics; K/T event; 38.10.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/314209

Islands: Palaeontology, Geology and Tectonics
Provedor de dados: 16
Autores: Donovan, S.K.
The intention of this Lyell Meeting is to bring together tectonicists, geologists, palaeontologists and geomorphologists to discuss the intersection of their specialisms in the geology of islands.
Tipo: Article / Letter to the editor
Palavras-chave: Lyell meetings; Islands; Geology; Palaeontology; Tectonics; Evolution; Isolation; 38.20; 38.37; 38.22.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/428038

Tectonics, islands and island hopping in the Early Palaeozoic benthos
Provedor de dados: 16
Autores: Harper, D.A.T.; Liljeroth, M.; Rasmussen, C.M.Ø.
Analyses confirm the roles of the oceanic provinces as both cradles and museums of evolution (Harper &amp; Mac Niocaill, 2002), with reference to the development of the global brachiopod fauna through the Floian-Sandbian (mid Early – early Late Ordovician) interval. Moreover, groups of taxa with particularly widespread distributions during the Dapingian-Darriwilian were possible island hoppers, taking advantage of the spectrum of disparate terranes generated by the magmatic and tectonic activity of the period.
Tipo: Article / Letter to the editor
Palavras-chave: Tectonics; Islands; Island hopping; Palaeozoic; Ordivician; Craddle of evolution; Museum of evolution; 38.22; 38.36.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/428058

The Paleogene Richmond Formation of Jamaica: Not an impact related succession - a comment
Provedor de dados: 16
Autores: James, K.H.
Donovan &amp; Pickerill published a short paper in 2008 which was essentially a comment on just part of an earlier contribution (James, 2005) on a broader topic. Although the latter was published in Caribbean Journal of Earth Sciences, to which Donovan &amp; Pickerill originally submitted their paper, this journal has not been published since late 2005. Of necessity, this discussion has moved elsewhere.
Tipo: Article / Letter to the editor
Palavras-chave: Jamaica; Paleogene; Richmond Formation; Tectonics; K/T event; 38.20.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/313867

Tectonic history and the biogeography of the freshwater fishes from the coastal drainages of eastern Brazil: an example of faunal evolution associated with a divergent continental margin
Provedor de dados: 83
Autores: Ribeiro,Alexandre Cunha.
The eastern Brazilian coastal drainages are of great biogeographical significance, because of their highly endemic fish faunas. Phylogenetic patterns suggest a close biotic relationship between the rivers that flow into the Atlantic and those on the adjacent upland crystalline shield. However, little has been said on the dynamics of the geological processes causally related to the cladogenetic events between these areas. Distributional and phylogenetic patterns suggest a close association with the geological history of the passive continental margin of South America, from the Cretaceous to the present day. In this area megadome uplifts, rifting, vertical movements between rifted blocks and the erosive retreat of the South American eastern continental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishes; Distributional Patterns; Passive Margin; South America; Tectonics.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200009

Método morfo-estructural para la identificación de paleoeventos tecto-sísmicos: Aplicación a la zona costera de San Lorenzo, norte de Ecuador
Provedor de dados: 20
Autores: Santana, E.; Dumont, J.F.; Valdez, F.; Pazmiño, N.; Tihay, J.P.; Usselmann, P.; López, E.
Se presentan evidencias de cambios morfológicos que implican la ocurrencia de movimientos relacionados con la actividad sísmica de la zona. En particular se enfoca en esta publicación un método de identificación de los eventos extremos que pueden ocurrir en estas áreas.
Tipo: Journal Contribution
Palavras-chave: Tectonics; Drainage water; Geological time; Marine geology; Tectonics; Marine geology; Drainage water; Http://aims.fao.org/aos/agrovoc/c_31904; Http://aims.fao.org/aos/agrovoc/c_4612; Http://aims.fao.org/aos/agrovoc/c_2374.
Ano: 2005
URL: http://hdl.handle.net/1834/2407

Análisis de las variaciones morfológicas de la Isla Santa Clara en los últimos 30 años, con énfasis en el área de la Estación Científica CPFG Héctor Chiriboga
Provedor de dados: 20
Autores: Martillo, C.; Moreira, L.; Pazmiño, A.; Chunga, K.; Rosero, J.; Calderón, M.; Romero, A.
La Isla Santa Clara se encuentra ubicada a la entrada de Guayaquil, es un Humedal de Importancia Internacional en el Marco de la Convención RAMSAR, habiendo sido declarada como sitio RAMSAR N° 1142, el 2 de febrero del 2002. En ella se encuentra construída la estación científica CPFG Héctor Chiriboga Guerra, donde se toman datos oceanográficos y meteorológicos. La Isla Santa Clara tiene un origen tectónico, pues es producto de un esfuerzo comprensivo del Pleistoceno Superior, ocasionado por el sistema de fallas transcurrentes Caracas-Guayaquil. Debido a procesos geológicos y ambientales, la Isla Santa Clara ha sufrido una erosión muy acelerada calculado en 1’824.710m3 entre los años 1980 a 2000, alrededor de toda la isla, y de 80,000m3 alrededor del sector...
Tipo: Journal Contribution
Palavras-chave: Morphometry; Tectonics; Global positioning systems; Islands; Tectonics; Global positioning systems; Islands; Http://aims.fao.org/aos/agrovoc/c_31904; Http://aims.fao.org/aos/agrovoc/c_36733; Http://aims.fao.org/aos/agrovoc/c_3962.
Ano: 2009
URL: http://hdl.handle.net/1834/3371

Delineating shallow Neogene deformation structures in northeastern Pará State using Ground Penetrating Radar
Provedor de dados: 42
Autores: Rossetti,Dilce F.
The geological characterization of shallow subsurface Neogene deposits in northeastern Pará State using Ground Penetrating Radar (GPR) revealed normal and reverse faults, as well as folds, not yet well documented by field studies. The faults are identified mostly by steeply-dipping reflections that sharply cut the nearby reflections causing bed offsets, drags and rollovers. The folds are recognized by reflections that are highly undulating, configuring broad concave and convex-up features that are up to 50 m wide and 80 to 90 ns deep. These deformation structures are mostly developed within deposits of Miocene age, though some of the faults might continue into younger deposits as well. Although the studied GPR sections show several diffractions caused by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neogene; Northeastern Pará State; Ground Penetrating Radar; Tectonics; Sedimentary rocks.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000200009

Contribution to the stratigraphy of the onshore Paraíba Basin, Brazil
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.; Bezerra,Francisco H.R.; Valeriano,Márcio M.; Brito-Neves,Benjamim B.; Ochoa,Felipe L.
Several publications have contributed to improve the stratigraphy of the Paraíba Basin in northeastern Brazil. However, the characterization and distribution of sedimentary units in onshore areas of this basin are still incomplete, despite their significance for reconstructing the tectono-sedimentary evolution of the South American passive margin. This work provides new information to differentiate among lithologically similar strata, otherwise entirely unrelated in time. This approach included morphological, sedimentological and stratigraphic descriptions based on surface and sub-surface data integrated with remote sensing, optically stimulated luminescence dating, U+Th/He dating of weathered goethite, and heavy mineral analysis. Based on this study, it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphology; Sedimentology; Stratigraphy; Chronology; Tectonics; Paraíba Basin.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200007

Structural control over well productivity in the Jundiaí River Catchment, Southeastern Brazil
Provedor de dados: 42
Autores: Neves,Mirna A.; Morales,Norberto.
The well productivity in crystalline terrains is extremely changeable and depends on external factors, in addition to the intrinsic properties of rocks. In the Jundiaí River Catchment, Southeastern Brazil, the main factor that influences well productivity is the existence of open discontinuities permeability in geologic environments that favor groundwater recharge. In that area, Pre-Cambrian shear and fault zones were reactivated throughout geologic time, controlling the morphostructural compartments and the Cenozoic sedimentary deposition. Superposition of productivity data and structural maps showed that more productive wells are concentrated mainly along the regional geologic structures. The structural control over well productivity is also noticeable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Groundwater; Crystalline rocks; Tectonics; Jundiaí; Southeastern Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200012

Tectonic control on the stratigraphic framework of Late Pleistocene and Holocene deposits in Marajó Island, State of Pará, eastern Amazonia
Provedor de dados: 42
Autores: Rossetti,Dilce F.
The traditional view that the Brazilian Amazonia is located in a tectonically stable area since the Cretaceous is changing in front of the increasing documentation of fault reactivations even during the Holocene. How the sedimentary record has responded to these events is an issue that remains to be approached with basis on field data. This work focuses on the stratigraphic correlation of late Quaternary deposits from eastern Marajó Island, with the goal of demonstrating the role of fault reactivation on the origin and preservation of these deposits. Despite the location in a stable platform of a continental passive margin, three studied stratigraphic units display significant vertical offsets that define two depocenters that are better explained through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Tectonics; Quaternary; Stratigraphic framework; Radiocarbon dating; Sedimentation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200020

Late quaternary dynamics in the Madeira river basin, southern Amazonia (Brazil), as revealed by paleomorphological analysis
Provedor de dados: 42
Autores: Hayakawa,Ericson H.; Rossetti,Dilce F.
Ancient drainage systems are being increasingly documented in the Amazon basin and their characterization is crucial for reconstructing fluvial evolution in this area. Fluvial morphologies, including elongate belts, are well preserved along the Madeira River. Digital Elevation Model from the Shuttle Radar Topography Mission favored the detection of these features even where they are covered by dense rainforest. These paleomorphologies are attributed to the shifting position of past tributaries of the Madeira River through avulsions. These radial paleodrainage networks produced fan-shaped morphologies that resemble distributary megafans. Distinguishing avulsive tributary systems from distributary megafans in the sedimentary record is challenging. Madeira´s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paleochannels; Amazon Basin; Madeira river; Remote sensing; Climate; Tectonics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100029