Paleocurrents and Basin Analysis

Potter, Paul Edwin; Pettijohn, F. J.

doi:10.1007/978-3-642-61887-1

Cited by 204 publications

(131 citation statements)

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“…A análise de paleocorrentes baseou-se na medição sistemática de estruturas sedimentares indicadoras de paleofl uxo, principalmente estratifi cações cruzadas acanaladas e tabulares, conforme métodos de Miall (1974de Miall ( , 1996de Miall ( , 2000, Potter e Pettijohn (1977) e Assine (1994). Quando necessário, os dados coletados foram corrigidos de forma a se restabelecer a posição original de cada plano ou eixo antes da deformação e consequente basculamento das camadas.…”

Section: Materiais E Métodos Utilizadosunclassified

Estratigrafia, arquitetura deposicional e faciologia da formação Missão Velha (Neojurássico-Eocretáceo) na área-tipo, bacia do Araripe, nordeste do Brasil: exemplo de sedimentação de estágio de início de rifte a clímax de rifte

Fambrini

Lemos

Tesser

et al. 2011

Geol. USP, Sér. cient.

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Section: Materiais E Métodos Utilizadosunclassified

Estratigrafia, arquitetura deposicional e faciologia da formação Missão Velha (Neojurássico-Eocretáceo) na área-tipo, bacia do Araripe, nordeste do Brasil: exemplo de sedimentação de estágio de início de rifte a clímax de rifte

Fambrini

Lemos

Tesser

et al. 2011

Geol. USP, Sér. cient.

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“…Between two field seasons the river eroded about 2 -3 m of its bank and we observed intensification of convolute folding with depth from gently inclined clay deposits (year 2000) to upright fold limbs (year 2001, Figure 6b). In the original undisturbed sediment sequence coarse silt and clay was deposited on top of thick clay deposits and enclosures of sand beds between impermeable layers were common thus establishing reverse density grading prone to liquefaction [Brenchley and Newall, 1972;Potter and Pettijohn, 1977]. An erosional discordance cut by a paleochannel and subsequent crossbedded channel fill deposits on top of the convolute folds ( Figure 6) show that the top of this outcrop was eroded during later incision of the meandering Pho river.…”

Section: Complex Convolute Foldingmentioning

confidence: 99%

Active tectonics in Eastern Lunana (NW Bhutan): Implications for the seismic and glacial hazard potential of the Bhutan Himalaya

Meyer

Wiesmayr

Brauner³

et al. 2006

Tectonics

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Paleoseismological investigations, brittle fault analysis, and paleostrain calculations combined with the interpretation of satellite imagery and flood wave modeling were used to investigate the seismic and associated glacial hazard potential in Eastern Lunana, a remote area in NW Bhutan. Seismically induced liquefaction features, cracked pebbles, and a surface rupture of about 6.8 km length constrain the occurrence of M ≥ 6 earthquakes within this high‐altitude periglacial environment, which are the strongest earthquakes ever been reported for the Kingdom of Bhutan. Seismicity occurs along conjugate sets of faults trending NE‐SW to NNW‐SSE by strike‐slip and normal faulting mechanism indicating E‐W extension and N‐S shortening. The strain field for these conjugate sets of active faults is consistent with widespread observations of young E‐W expansion throughout southern Tibet and the north Himalaya. We expect, however, that N‐S trending active strike‐slip faults may even reach much farther to the south, at least into southern Bhutan. Numerous glacial lakes exist in the investigation area, and today more than 100 × 106 m3 of water are stored in moraine‐dammed and supraglacial lakes which are crosscut by active faults. Strong earthquakes may trigger glacial lake outburst floods, and the impact of such flash floods may be worst 80 km downstream where the valley is broad and densely populated. Consequently, tectonic models of active deformation have to be closely linked with glacial hazard evaluation and require rethinking and modification.

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“…A key aspect of this method is to develop a sedimentary model and to make successful predictions about those portions of the basin that are concealed or unexplored (Potter and Pettijohn, 1977). Basin analysis techniques are standard procedures for many resource evaluation studies, whether petroleum exploration, placer mining, regional groundwater potential or engineering planning (Miall, 1984;De Mulder and Hagerman, 1989), and they have a role to play in land use planning.…”

Section: Introductionmentioning

confidence: 99%

A Basin Analysis of the Wabigoon Area of Lake Agassiz, a Quaternary Clay Basin in Northwerstern Ontario

Sharpe¹,

Pullan²,

Warman³

2007

gpq

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Cet article est diffusé et préservé par Érudit.Érudit est un consortium interuniversitaire sans but lucratif composé de l'Université de Montréal, l'Université Laval et l'Université du Québec à Montréal. Il a pour mission la promotion et la valorisation de la recherche. www.erudit.org Tous droits réservés © Les Presses de l'Université de Montréal, 1992 Géographie physique et Quaternaire, 1992, vol. 46, n° 3, p. 295-309, 11 ABSTRACT Information from a wide range of sources is integrated in a basin analysis of the Wabigoon Basin, a Quaternary clay basin located on the Canadian Shield in northwestern Ontario. The basin sediments were deposited between 10.9 ka and 9.5 ka, along the margin of the Rainy Lobe of the Laurentide Ice Sheet, which formed the northern boundary of proglacial Lake Agassiz. The basin architecture is dominated by four major elements: end moraines, eskers, kames and a clay plain, all of which overlie irregular bedrock topography. End moraines, eskers and kames are composed mainly of a fining upward sequence of gravels and sands. The geometry of these sedimentary units, and their sedimentary structures indicates they were deposited mainly by high and low-density turbidity currents, on ice-marginal subaqueous outwash fans. Eskers contain a core of coarse gravel and sand deposited within subglacial meltwater conduits, overlain by subaqueous fan sediments deposited at the conduit mouth. Esker ridges were formed during conduit filling events and flanking deposits were formed when a conduit remained in use during icemarginal retreat. Where conduits were shortlived, isolated subaqueous fans (kames) were formed. A depositional model is proposed which relates moraine formation to catastrophic releases of subglacial meltwater and sediment simultaneously along the entire margin of the Rainy Lobe. The clay plain forms a broad blanket of fine-grained, rhythmically-bedded sediment which obscures bedrock topography, and often buries esker and kame deposits. Seismic profiles and overburden drilling reveal deep (50-70 m) bedrock lows beneath the clay plain. These lows, oriented sub-parallel to the ice margin, acted as sediment traps, and were infilled by the deposits of underflows generated at the ice margin.

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Paleocurrents and Basin Analysis

Cited by 204 publications

References 0 publications

Estratigrafia, arquitetura deposicional e faciologia da formação Missão Velha (Neojurássico-Eocretáceo) na área-tipo, bacia do Araripe, nordeste do Brasil: exemplo de sedimentação de estágio de início de rifte a clímax de rifte

Estratigrafia, arquitetura deposicional e faciologia da formação Missão Velha (Neojurássico-Eocretáceo) na área-tipo, bacia do Araripe, nordeste do Brasil: exemplo de sedimentação de estágio de início de rifte a clímax de rifte

Active tectonics in Eastern Lunana (NW Bhutan): Implications for the seismic and glacial hazard potential of the Bhutan Himalaya

A Basin Analysis of the Wabigoon Area of Lake Agassiz, a Quaternary Clay Basin in Northwerstern Ontario

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