Добірка наукової літератури з теми "Bacino intracratonico"
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Статті в журналах з теми "Bacino intracratonico"
Silva, Rogério Rodrigues da. "AS BACIAS PROTEROZÓICAS DO ESPINHAÇO E SÃO FRANCISCO EM MINAS GERAIS: UMA ABORDAGEM DO PONTO DE VISTA DA ESTRATIGRAFIA DE SEQUÊNCIAS." Revista Geonomos 6, no. 1 (July 1, 1998). http://dx.doi.org/10.18285/geonomos.v6i1.159.
Повний текст джерелаPaiva, Jéssica Melanya Sisti de, Gislaine Amorés Battilani, Rubia Ribeiro Viana, and Maurício José dos Reis. "ÍNDICE DE CRISTALINIDADE DA ILITA E CARACTERIZAÇÃO DOS ARGILOMINERAIS DA FORMAÇÃO PIMENTA BUENO – BACIA DOS PARECIS." Geonomos, November 30, 2016. http://dx.doi.org/10.18285/geonomos.v24i1.825.
Повний текст джерелаДисертації з теми "Bacino intracratonico"
Mariani, Patrizia. "Caratterizzazione della struttura litosferica del bacino intracratonico del Parana' (Sud America) mediante modellazione di dati gradiometrici e gravimetrici da satelliti di nuova generazione (GRACE e GOCE)." Doctoral thesis, Università degli studi di Trieste, 2012. http://hdl.handle.net/10077/7393.
Повний текст джерелаRiassunto: La finalità di questo studio è la caratterizzazione della litosfera sottostante il bacino intracratonico del Paraná. I modelli gravimetrici adottati sono vincolati ai dati geofisici tra i quali quelli sismologici più recenti (Lloyd et al., 2010) e sono corroborati dai modelli petrografici (Bryan & Ernst, 2008). Si offre un approccio che include la comparazione isostatica a quella sismologica al fine di interpretare al meglio la struttura litosferica nell’area del bacino in analisi e di comprendere le variazioni geodinamiche legate alle province geologiche ivi presenti. Il bacino del Paraná (Sud America) è ubicato nella piattaforma stabile del Sud America, ed è circondato da cratoni tra i quali: il cratone amazzonico, il cratone di San Francisco e il Rio de La Plata. La sua genesi in epoca paleozoica è quella di vasto bacino sedimentario, sul quale però durante il Mesozoico (Cretaceo inferiore) si è sviluppata un’intensa attività vulcanica (Capitolo 3). Quest’attività effusiva lo classifica tra le maggiori LIP (Large Igneous Province) mondiali, provincie magmatiche con volume di materiale espulso superiore a 0.1 Mkm3 (Bryan & Ernst, 2008). L’analisi effettuata in questo lavoro è eseguita tramite lo studio del campo gravimetrico da modelli di nuova generazione derivanti dal satellite GOCE (Gravity field and steady state Ocean Circulation Explorer) e GRACE (Gravity Recovery and Climate Experiment). I prodotti gravimetrici satellitari di GOCE possiedono una risoluzione senza precedenti (mezza lunghezza d’onda 80 km): ciò consente di validare i modelli gravimetrici precedenti (280 km, EGM08, Pavlis et al., 2008) che per offrire una maggior dettaglio nelle anomalie integravano ai dati satellitari di GRACE le campagne gravimetriche terrestri, non sempre complete e quindi globalmente precise e di adempire agli indispensabile fini di interpretazione geodinamica. La descrizione dei modelli e la validazione degli stessi sono offerte nel Capitolo 2. I campi potenziali studiati per le principali province geologiche sono illustrati nel Capitolo 5; mentre nel Capitolo 6 si applica la metodologia spettrale sulla seconda derivata verticale del potenziale per discernere le diverse litologie individuate nell’area di studio. L’anomalia di Bouguer calcolata tramite sviluppo in armoniche sferiche viene corretta sia in superficie e in profondità stimando l’effetto di gravità dei sedimenti conosciuti (Capitolo 4) e le conoscenze geofisiche note. Il bacino è composto da: i sedimenti pre-vulcanici paleozoici di spessore pari a circa 3500 m, la Formazione Serra Geral composta principalmente da basalti tholeiitici del cretaceo inferiore (~1500 m di spessore), ed infine i sedimenti post-vulcanici del cretaceo superiore appartenenti al Gruppo Bauru, solo 300 m di spessore (Capitolo 3). Sfruttando i modelli sismologici regionali è stato infine possibile valutare anche il contributo gravimetrico dello spessore crostale stimato con la sismologia. Con questi elementi viene calcolata la Bouguer residua, che è interpretata come anomalia isostatica e quindi correlata alle strutture geologiche locali e regionali. Questo comporta il riconoscimento di una struttura anomala sotto la parte settentrionale del bacino del Paraná comprendente anche parte del settore adiacente Blocco del Guaporé. L’inquadramento a scala maggiore però permette di evidenziare un’area molto più ampia di quanto riconosciuto in prima istanza. Tale anomalia è centrata infatti nel nucleo archeano del cratone amazzonico, di cui quindi il bacino del Paraná risulta solamente il suo braccio più meridionale. In assenza di attività tettonica-magmatica recente (ultima risale 50 Ma) ed in mancanza di grandi anomalie superficiali, tale anomalia positiva potrebbe essere inserita in un contesto regionale e più profondo, rappresentando delle dinamiche di mantello. Infine tramite inversione gravimetrica è stata quantificata numericamente l’anomalia nel bacino di studio utilizzando la geometria semplice di un tronco di cono. La quantità di materiale in presunto underplating che dovrebbe spiegare l’anomalia positiva è compatibile ai modelli petrografici conosciuti. Tali modelli sottolineano come la presenza di un magmatismo noto in superficie rappresenti solo una piccola parte di quello che dovrebbe trovarsi in intrusione: è stato calcolato infatti che il magmatismo superficiale potrebbe rappresentare solo la decima parte di quello associato in profondità.
Abstract: Goal of this study is the characterization of the lithosphere beneath the intracratonic area of Paraná basin. We formulate gravimetric models constrained by geophysical data and new seismological models (Lloyd et al., 2010) and also underpinned by petrographic models (Bryan & Ernst, 2008). Our approach includes isostatic Moho to seismological Moho comparison to better understand lithospheric structures in the area of basin, and geodynamic context of the local geological province. Paraná basin (South America) is located on the stable South American platform, and it is surrounded by some craton areas, as: the Amazon craton, the San Francisco craton and the Rio de La Plata Craton. During Paleozoic epoch the Paraná region was a wide sedimentary basin, while in the Mesozoic (Early Cretaceous) a significant volcanic activity developed on it. This effusive phase classifies the basin between the greatest LIP (Large Igneous Province) worldwide known, where the magmatism volume is greater than 0.1 Mkm3(Bryan & Ernst, 2008). We analyzed gravimetric field using new generation satellite models as GOCE (Gravity field and steady-state Ocean Circulation Explorer) and GRACE (Gravity Recovery and Climate Experiment). GOCE’s products gives unprecedented resolution (half wavelength: 80 km) helping to validate previous global gravity models as EGM08 (Pavlis et al., 2008). The 280 km satellite- only resolution was increased by integration of terrestrial gravity fields data, but this methodology added some problems during processing, where the terrestrial information is not complete or precise. On Chapter 2 some descriptions and validation among models are shown. We calculated potential field for the main geological provinces of Chapter 5; while in Chapter 6, using spectral methodology on the second vertical derivatives of potential field, we identify main lithologic units. The Bouguer anomaly calculated with the spherical harmonics expansion of the potential field is corrected by known stratigraphic units. The basin is made by pre-volcanic sediments of Paleozoic age, with over 3500 m of thickness, Serra Geral Formation, mainly tholeiitic basalts of Early Cretaceous (~1500 m), and post-volcanic sediment of Bauru Group, only 300 m of thickness. We evaluate the effect of crustal thickness variations on the gravity field by using the seismological crustal model. Removing these elements from the Bouguer anomaly, we obtain the residual Bouguer anomaly. Further we calculate the isostatic anomaly and we correlate it to the local and regional geological framework. This helps to recognize a positive residual anomaly on the northern part of the Paraná basin, including the nearby Guaporé Block. Setting a major scale we see the same phenomenon: it is in agreement with the archean nucleus of the Amazon craton, so we can claim that the anomaly on the Paraná is only the southern part of a greater positive area. The relative gravity positive anomaly in the Paraná basin is not very extended and lack of tectonic activity since50 Ma makes us consider that this anomaly is part of a deeper and greater anomaly, maybe due to mantle dynamic effects. We quantified the intracrustal density anomaly using gravity inversion and adopting a truncated cone geometry and volume in accord to petrographic models. It is known that an underplated magmatic body can be up to 10 time larger than the associated extrusive volume and this corroborates our models.
XXIV Ciclo
1979
Siqueira, Leonardo Ferreira da Silva de. "Tectônica deformadora em sinéclises intracratônicas: a origem do Alto Estrutural de Pitanga, Bacia do Paraná, SP." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-27072011-164342/.
Повний текст джерелаIntracratonic basins are slightly deformed compared to other types of sedimentary basins. The architecture of intracratonic basins are characterized by subhorizontal stratigraphic units which may be followed by large distances without significant structural changes. Deformation is concentraded in specifc sites such as fault zones and structural highs. Structural highs are interesting sites to study intracratonic basins since the tilting of layers provides the outcrop of different stratigraphic units in restricted areas, but most of all, they are conducive regions for the understanding of their tectonic evolution. Moreover, these features are traditionally investigated as potential traps of hydrocarbons. They have been used in the storage of fuel gas and, more recently, has evaluated its potential for storage of greenhouse gases. In Paraná Basin there are several structural highs among which stands out for its dimensions the so called Pitanga Structural High . Located in the central-eastern part of São Paulo State, south east of Brazil, is a gentle NNE-SSW-oriented anticlinal fold. On the map, it has a roughly elliptical geometry, reaching approximately 30 and 15 km in length on its major NNE-SSW and minor WNW-ESE axis, respectively. This study aimed to characterize, in detail, the Pitanga Structural High geometry by constructing a structural contour map, and to analyze the main structural styles found in this region to clarify what tectonic style and orientation of the stress field were responsible for the generation of this anticlinal. There are varied structural styles found in the area of Pitanga Structural High, related to compressive, transcurrent, and extensional tectonic regimes of six distinct deformation phases. By comparing the spatial orientation and geometry of the anticlinal characterized by structural contour map, and orientation of structures and stress field associated to different stages of deformation, it was possible to identify the likely tectonism which led to this structural high and so estimate its age. It was also possible to evaluate its potential as a trap for the petroleum system Irati-Pirambóia.
Guadagnin, Felipe. "Arcabouço cronológico e proveniência do supergrupo espinhaço na região da Chapada Diamantina e bacias correlatas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/108375.
Повний текст джерелаThe Espinhaço Supergroup corresponds to the volcano–sedimentary units deposited over the São Francisco Craton between the late Paleoproterozoic and early Neoproteozoic Eras. This stratigraphic unit is exposed over a wide area of the São Francisco Craton and adjacent mobile belts. Studies based on sedimentology– stratigraphy, petrography, geochemistry, and detrital zircon U–Pb and Lu–Hf isotopes, combined with data available in the literature, allow characterize main source areas, depositional ages, and the stratigraphic stacking of the Espinhaço Supergroup at Chapada Diamantina, one of the type-areas of this lithostratigraphic unit. The Espinhaço Supergroup is subdivided into three chronostratigraphic sequences, the Statherian (1.8–1.68 Ga; Lower Espinhaço), Calymmian-early Ectasian (1.6–1.38 Ga; Middle Espinhaço), and Stenian-early Tonian sequences (1.2–0.9 Ga; Upper Espinhaço). At Chapada Diamantina, the Statherian sequence comprises the Serra da Gameleira Formation and Rio dos Remédios Group, of which volcanic rocks aged 1.75 Ga date the deposition; the Calymmian-early Ectasian comprises the Paraguaçú Group (intruded by ca. 1.5 Ga dykes) and Tombador Formation, which includes volcanic zircon grains dated ca. 1.43 Ga; and the Stenianearly Tonian sequence comprises the Caboclo and Morro do Chapéu Formations. The framework modal and the chemical compositions of the sandstones from Middle and Upper Espinhaço sequences point to a recycled source area, related with collisional or rift tectonic setting. The detrital zircon U–Pb ages and Hf isotopic compositions show variable pattern. At the base, the juvenile and evolved Rhyacian zircon grains predominates, whereas this pattern changes with the input of Archean– Paleoproterozoic zircons with Hf isotopes indicating Eoarchean and Neoarchean crustal sources, such as the Gavião Block. At the top, another change of detrital zircons occurred with the addition of Statherian, derived from the reworking of lower sequences, and Calymmian grains, sourced from coeval magmatism. The regional approach of the cratonic sequences deposited during the same period in other areas of the San Francisco Craton and adjacent mobile belts, such as those sequences exposed in the Southern and Northern Espinhaço ranges, and the Andrelândia, Araí, Paranoá, and Serra Mesa Groups and Carandaí and Tiradentes Formations, distinguish five detrital zircons distribution patterns, controlled by the depositional age and paleogeography. The information are important for future studies of paleogeography and kinematics of Proterozoic supercontinents.