Stratal disruption and development of mélange, Western Newfoundland: effect of high fluid pressure in an accretionary terrain during ophiolite emplacement

Waldron, John W.F.; Turner, D.; Stevens, Kevin M.

doi:10.1016/0191-8141(88)90100-9

Cited by 35 publications

(9 citation statements)

References 16 publications

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“…If the displacement was large enough, the high-viscosity layer disintegrated into boudin-like lenses or angular clasts. The latter resembles the features described by WALDRON et al (1988) as "chocolate tablet" boudins formed by extension fractured boudinage (FOGARASI, 1991). Lenses consist of massive bioclastic limestone, while the matrix is clayey limestone.…”

Section: Soft-sediment Deformationmentioning

confidence: 79%

“…In spite of the different physical circumstances, we interpret this structure as a result of shearing of highly viscous, almost lithified sediments. Lenses contoured by these shear planes represent shear boudins (WALDRON et al, 1988). Bothtype ofboudins are products of progressive bed attenuation and reflect layer-parallel extension due to slow downslope creeping of the highly viscous material.…”

Section: Soft-sediment Deformationmentioning

confidence: 99%

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Gravity-flow dominated sedimentation on the Buda paleoslope (Hungary): Record of Late Eocene continental escape of the Bakony unit

et al. 1992

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Zusammenfassung AbstractThe Upper Eocene sequence of the Buda Hills consists of fluvial and shallow marine conglomerates, sandstones, bioclastic shallow-water limestone, marlstone and pelagic Globigerina marl. The succession illustrates rapid, overall subsidence of the area, from terrestrial environments to bathyal depths. Sedimentation occurred on slopes situated on the flanks of synsedimentary basement antiforms. Vertical growth of antiforms caused progressive tilting of beds, layerparallel extension by boudinage and faulting, and induced redeposition by mass flow. Antiforms are localised in the dextral Buda/3rs shear zone and in the Buda imbricate stack, which accommodated the dextral displacement. The latter is underlain by blind reverse faults probably merging into a detachment tault at shallow depths. These structures were formed by WNW-ESE oriented compression and NNE-SSW directed tension. The morphological expression of the imbricate stack is the SE-facing Buda slope.The Bakony unit, while "escaping" from the Alps, was bordered by a northern sinistral and a southern dextral shear zone. Synsedimentary tectonics in the Buda

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Section: Soft-sediment Deformationmentioning

confidence: 79%

Section: Soft-sediment Deformationmentioning

confidence: 99%

Gravity-flow dominated sedimentation on the Buda paleoslope (Hungary): Record of Late Eocene continental escape of the Bakony unit

et al. 1992

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“…This collision led to the emplacement of the Humber Arm and Hare Bay allochthons (Rodgers & Neale, 1963;Williams, 1975) (Figure 1a), comprising continental margin sedimentary rocks, mélanges and ophiolites, above the former Laurentian passive margin and overlying Middle Ordovician foreland basin clastic rocks containing ophiolitic detritus (Hiscott, 1978;Quinn, 1992;Stevens, 1970). Farther south, in the Bay of Islands and Port au Port Peninsula (Figure 1b), the allochthon contains mélanges and broken formation more typical of deformation in an accretionary wedge (Lacombe, Waldron, Williams, & Harris, in press;Waldron, Turner, & Stevens, 1988). Farther south, in the Bay of Islands and Port au Port Peninsula (Figure 1b), the allochthon contains mélanges and broken formation more typical of deformation in an accretionary wedge (Lacombe, Waldron, Williams, & Harris, in press;Waldron, Turner, & Stevens, 1988).…”

Section: Taconian Arc-continent Collisionmentioning

confidence: 99%

Anticosti foreland basin offshore of western Newfoundland: Concealed record of northern Appalachian orogen development

2019

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The Anticosti Basin, largely hidden beneath the Gulf of St. Lawrence, includes foreland basin successions that record multiple tectonic events associated with the Ordovician to Devonian evolution of the northern Appalachian orogen. Due to the lack of well ties and minimal onshore exposure, geophysical data must be used in mapping the offshore stratigraphy. Outcropping geologic boundaries are tied to magnetic lineaments that parallel stratigraphy. These lineaments are correlated with reflections on seismic profiles in order to interpret the subsurface. Seismic isochron maps for successive basin development episodes display differences in geometry, implying that orogenic loading varied through time. The geometry and subsidence rates recorded by the Middle Ordovician Goose Tickle Group imply that it formed in a pro‐arc setting associated with loading during arc‐continent collision that was most intense in the northern Newfoundland Appalachians. The geometry and subsidence recorded by the overlying Long Point Group imply pro‐arc loading by Taconian allochthons in the Québec segment of the orogen. Diachronous subduction polarity reversal along the margin placed the Long Point Group in a combined retro‐arc and pro‐arc setting, comparable to that experienced by parts of the north Australian margin at the present day. The uppermost Silurian to Lower Devonian Clam Bank Formation and Lower Devonian Red Island Road Formation represent foreland basin successions associated with the later Salinian and Acadian orogenies. Their consistent thickness implies a broad, shallow basin, suggesting that the lithosphere was cooler and stronger than during earlier subsidence, and are consistent with a retro‐arc setting.

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“…Fisher & Byrne 1987;Needham 1987;Fergusson et al 1990;Kimura & Mukai 1991), or a combination of extensional and contractional strains associated with asymmetrical folds and/or mesoscopic duplexes (e.g. Moore & Wheeler 1978;Waldron et al 1988;Agar 1990;Kano et al 1991). Some are by subvertical material transport due to hydrofracturings and subsequent upward forceful intrusions (e.g., Barber et al.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

“…Barber et al 1986;Lash 1987;Pickering et al 1988;Wakita 1988;Orange 1990). However, smaller-scale hydrofractured fabrics do not necessarily relate to upward intrusion or mud-diapirism, but they are possibly restricted within specific overpressured layers (Byrne 1984;Waldron et al 1988;Agar 1990;Fergusson et al 1990;.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Early deformation fabrics of melange in the Mesozoic Waipapa Terrane, North Island, New Zealand

Kano¹

1995

Island Arc

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The Waipapa Terrane in northern North Island, New Zealand, is a Mesozoic accretionary complex formed along the Gondwana margin. It contains abundant melange rocks with distinctive characteristics. Precise analyses of their mesoscopic fabrics in Waiheke Island near Auckland have revealed the following sequence of deformation. The earliest phase of deformation of the sandstone/mudstone association, which is the main constituent of this terrane, originated by chaotic mixing of sand and mud due to liquidization of water-saturated, poorly consolidated sediments. The second phase was characterized by hydrofracturing and subsequent forceful injection of ductile mud into rather brittle sand. Local intrusions of sand forming dykes and sills followed these events, as well as intrusions of pelagic/hemipelagic green argillite originally underlying the sandstone/mudstone association. An abundant occurrence of these mixing and multi-stage injection/intrusion fabrics strongly suggest that the Waipapa Terrane around the study area was a site of high pore-fluid pressure. Scaly-foliated melange fabrics with monoclinic symmetry, originating from layer-parallel shearing, were then locally superimposed on the pre-existing melange fabrics. Similar scaly-foliated fabrics also developed in the chert beds originally intercalated between the green argillite and the uppermost part of the oceanic crust. These scaly fabrics might have been related to the regional stacking and juxtaposition of the accreted sediments. The sequence and variation in style of deformation forming the melange fabrics presumably reflected changes in porosity and state of compaction of accreted sediments in a shallow tectonic level.

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Stratal disruption and development of mélange, Western Newfoundland: effect of high fluid pressure in an accretionary terrain during ophiolite emplacement

Cited by 35 publications

References 16 publications

Gravity-flow dominated sedimentation on the Buda paleoslope (Hungary): Record of Late Eocene continental escape of the Bakony unit

Gravity-flow dominated sedimentation on the Buda paleoslope (Hungary): Record of Late Eocene continental escape of the Bakony unit

Anticosti foreland basin offshore of western Newfoundland: Concealed record of northern Appalachian orogen development

Early deformation fabrics of melange in the Mesozoic Waipapa Terrane, North Island, New Zealand

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