Results 141 to 150 of about 430 (186)

Kinematic models of dewatering accretionary prisms

Journal of Geophysical Research: Solid Earth, 1994
Steady state two‐dimensional analytical solutions are derived for sediment velocity and rate of fluid expulsion in a thickening accretionary prism with smooth upper and lower surfaces. Two different kinematic assumptions lead to two similar sets of solutions. In one case, the sediment flow lines are assumed to diverge uniformly landward.
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Plumbing accretionary prisms: effects of permeability variations

Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1991
Fault zones focus fluid expulsion in the muddy northern Barbados Ridge accretionary prism with fault-parallel permeabilities about 1000 times greater than intergranular permeabilities in the adjacent sediment. In the Oregon prism the low bedding-perpendicular permeability (due to mudstones) inhibits intergranular dewatering; however, intergranular flow
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Seismicity of the forearc marginal wedge (accretionary prism)

Journal of Geophysical Research: Solid Earth, 1982
Three different types of seismic data have been examined for seismic events occurring within the zone called the accreted wedge or forearc marginal wedge that underlies the inner trench wall of some arcs. These types of data are (1) teleseismically recorded earthquakes that have been reported in the literature as occurring in major arc‐trench regions ...
Allen T. Chen, Cliff Frohlich, Gary V. Latham   +2 more
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Tectonic Implications of Illite/Smectite Diagenesis, Barbados Accretionary Prism

Clays and Clay Minerals, 1986
AbstractThe depth distribution of illite/smectite (I/S) compositions was investigated for a well drilled to a depth of 3462 m on Barbados Island, the only subaerial exposure of the Barbados accretionary complex. The classical pattern of increasing percentage of illite interlayers in the mixed-layer clay with increasing burial depth was not observed ...
Jane Schoonmaker, Fred T. Mackenzie, Robert C. Speed   +2 more
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Extreme efficiency of mud volcanism in dewatering accretionary prisms

Earth and Planetary Science Letters, 2001
Drilling results from two mud volcanoes on the Mediterranean Ridge accretionary complex as well as bottom sampling and the wealth of geophysical data acquired recently have provided fundamental knowledge of the 3D geometry of mud extrusions. Mud volcanism is generally related to buoyancy (density inversion), and is triggered by the collision of the ...
Achim Kopf, Dirk Klaeschen, Jean Mascle
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Synsedimentary Deformation in Fossil Accretionary Prism, Greece: ABSTRACT

AAPG Bulletin, 1980
End_Page 740------------------------------Structural and stratigraphic evidence demonstrates that Paleogene turbidites of the Politses Formation were progressively deformed during sedimentation. The Politses Formation is preserved in internally undeformed thrust sheets that are tectonically intercalated with sheets of severely deformed blocks of the ...
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A geodynamic model of the Southern Apennines accretionary prism

Terra Nova, 1996
ABSTRACTThe Apennines comprise a Neogen—Quaternary accretionary prism that shows several anomalies with respect to classic alpine‐type mountain belts, namely (i) low elevation, (ii) a shallow new Moho below the core of the belt, (iii) high heat flow in the internal parts, (iv) mainly sedimentary cover involved in the prism, (v) a deep foredeep and (vi)
C. Doglioni, P. Harabaglia, G. Martinelli, F. Mongelli, G. Zito   +4 more
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Depositional processes across the Sinú Accretionary Prism, offshore Colombia

Marine and Petroleum Geology, 2010
The Pliocene to Recent of the Sinu Accretionary Prism, offshore Colombia, features gravity current dominated basins characterised primarily by channel- and sheet-like architectures and those with dominantly hemipelagic fills. The prism is fed by rivers that drain from uplifted older basins and volcanic Andean terranes to the south and east which source
Jamie S. Vinnels, Robert W.H. Butler, William D. McCaffrey, Douglas A. Paton   +3 more
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Material Transport within Accretionary Prisms and the "Knocker" Problem

The Journal of Geology, 1980
Observations of high-pressure metamorphic rocks occurring as blocks (knockers) and as thrust sheets intercalated into non-metamorphosed rocks in subduction complexes have led to models of material transport within accretionary prisms having large-scale differential vertical transport.
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Deformation structures from the toes of active accretionary prisms

Journal of the Geological Society, 1998
Coring of sediments in active accretionary prisms by the Ocean Drilling Program (ODP) has revealed a wide variety of deformation features. The structures throw light on processes associated with accretion and the drainage of water-saturated sediments during active deformation.
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