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N Kontopoulos - One of the best experts on this subject based on the ideXlab platform.

  • pliocene pleistocene fluvial wave dominated Deltaic Sedimentation the pamisos delta southwest peloponnesus greece
    Geological Magazine, 1994
    Co-Authors: A Zelilidis, N Kontopoulos
    Abstract:

    A fluvial /wave-dominated delta was formed during late Pliocene times in southwestPeloponnesus, influenced by NNW—SSE and ENE—WSW trending faults. The depositional patternremained unchanged through early Pleistocene times, when the pre-existing active faults with WNW—ESE extension were combined with an eastward asymmetrical subsidence of the graben. Inthe Deltaic environment, marshes, lakes and lagoons were created in the western parts, whereas largequantities of sediments were deposited in the central and eastern parts adjacent to basin marginsof steeper relief. This study combines grain size parameters, total organic matter, carbonate and clay mineralogyand structural analysis to: (a) determine the pattern of Sedimentation in sub-environments and (b)create a fluvial/wave-type Deltaic depositional model, and distinguish between delta-plain, delta-front and pro-delta environments. The Pliocene-Pleistocene, fluvial/wave-dominated delta model inthis study can be used to predict Deltaic Sedimentation in analogous basins.

  • Pliocene–Pleistocene fluvial/wave-dominated Deltaic Sedimentation: the Pamisos delta, southwest Peloponnesus, Greece
    Geological Magazine, 1994
    Co-Authors: A Zelilidis, N Kontopoulos
    Abstract:

    AbstractA fluvial /wave-dominated delta was formed during late Pliocene times in southwestPeloponnesus, influenced by NNW—SSE and ENE—WSW trending faults. The depositional patternremained unchanged through early Pleistocene times, when the pre-existing active faults with WNW—ESE extension were combined with an eastward asymmetrical subsidence of the graben. Inthe Deltaic environment, marshes, lakes and lagoons were created in the western parts, whereas largequantities of sediments were deposited in the central and eastern parts adjacent to basin marginsof steeper relief.This study combines grain size parameters, total organic matter, carbonate and clay mineralogyand structural analysis to: (a) determine the pattern of Sedimentation in sub-environments and (b)create a fluvial/wave-type Deltaic depositional model, and distinguish between delta-plain, delta-front and pro-delta environments. The Pliocene-Pleistocene, fluvial/wave-dominated delta model inthis study can be used to predict Deltaic Sedimentation in analogous basins.

A Zelilidis - One of the best experts on this subject based on the ideXlab platform.

  • pliocene pleistocene fluvial wave dominated Deltaic Sedimentation the pamisos delta southwest peloponnesus greece
    Geological Magazine, 1994
    Co-Authors: A Zelilidis, N Kontopoulos
    Abstract:

    A fluvial /wave-dominated delta was formed during late Pliocene times in southwestPeloponnesus, influenced by NNW—SSE and ENE—WSW trending faults. The depositional patternremained unchanged through early Pleistocene times, when the pre-existing active faults with WNW—ESE extension were combined with an eastward asymmetrical subsidence of the graben. Inthe Deltaic environment, marshes, lakes and lagoons were created in the western parts, whereas largequantities of sediments were deposited in the central and eastern parts adjacent to basin marginsof steeper relief. This study combines grain size parameters, total organic matter, carbonate and clay mineralogyand structural analysis to: (a) determine the pattern of Sedimentation in sub-environments and (b)create a fluvial/wave-type Deltaic depositional model, and distinguish between delta-plain, delta-front and pro-delta environments. The Pliocene-Pleistocene, fluvial/wave-dominated delta model inthis study can be used to predict Deltaic Sedimentation in analogous basins.

  • Pliocene–Pleistocene fluvial/wave-dominated Deltaic Sedimentation: the Pamisos delta, southwest Peloponnesus, Greece
    Geological Magazine, 1994
    Co-Authors: A Zelilidis, N Kontopoulos
    Abstract:

    AbstractA fluvial /wave-dominated delta was formed during late Pliocene times in southwestPeloponnesus, influenced by NNW—SSE and ENE—WSW trending faults. The depositional patternremained unchanged through early Pleistocene times, when the pre-existing active faults with WNW—ESE extension were combined with an eastward asymmetrical subsidence of the graben. Inthe Deltaic environment, marshes, lakes and lagoons were created in the western parts, whereas largequantities of sediments were deposited in the central and eastern parts adjacent to basin marginsof steeper relief.This study combines grain size parameters, total organic matter, carbonate and clay mineralogyand structural analysis to: (a) determine the pattern of Sedimentation in sub-environments and (b)create a fluvial/wave-type Deltaic depositional model, and distinguish between delta-plain, delta-front and pro-delta environments. The Pliocene-Pleistocene, fluvial/wave-dominated delta model inthis study can be used to predict Deltaic Sedimentation in analogous basins.

Alan J Bartow - One of the best experts on this subject based on the ideXlab platform.

  • coarse grained Deltaic Sedimentation in the miocene cuyama strike slip basin california coast ranges
    Sedimentary Geology, 1990
    Co-Authors: Alan J Bartow
    Abstract:

    Abstract The Cuyama basin, located in the southern Coast Ranges of California southwest of the San Andreas fault, developed early in the history of the San Andreas transform system. The Miocene marine basin formed in a transtensional setting along a dextral strike-slip fault of the transform system following Oligocene non-marine basin formation in an extensional setting. The lower and middle Miocene Vaqueros Formation in the northwestern part of the basin, which represents the first of two transgressive-regressive cycles, is described here in terms of nine facies in two broad facies groups. The 400-m-thick Soda Lake Shale Member (of the Vaqueros) comprises deep-basin and starved-basin facies. A thin transgressive facies occurs locally at the base of the formation. The overlying Painted Rock Sandstone Member (of the Vaqueros), which is more than 2200 m thick and consists mostly of coarse-grained sandstone and pebbly sandstone, constitutes a delta complex of prodelta, slope channel, delta front, tide-influenced distributary channel, interdistributary bay, and fluvial channel facies. The basinal depositional system consisted of turbidite mud and sand, and hemipelagic and pelagic sediments of the basinal facies deposited in a rapidly subsiding basin. The delta depositional system consisted of the delta complex facies that prograded into the deep basin and had a steep prodelta slope that extended to bathyal depths. The delta is inferred to be a mixed fluvial-wave-dominated fan delta, analogous in its delta-front morphology and processes to a fjord delta, in which coarse sediment delivered to the delta front by braided streams was transported down the prodelta slope into deep water by sediment gravity flows. Transgression and rapid deepening of the basin in the early Miocene coincided with rapid tectonic subsidence. Deepening culminated with deposition of a starved-basin facies or condensed section at the time of maximum transgression, which was followed by the beginning of a regression and basin shallowing. The overall basin history and geometry of the northwestern Cuyama basin are typical of strike-slip basins. The initial rapid subsidence to bathyal depths at rates of more than 500 m/m.y. in the early Miocene is interpreted to be a result of extension at the releasing bend of a dextral strike-slip fault.

J A Bartow - One of the best experts on this subject based on the ideXlab platform.

  • coarse grained Deltaic Sedimentation in the miocene cuyama strike slip basin california coast ranges
    AAPG Bulletin, 1990
    Co-Authors: J A Bartow
    Abstract:

    The Cuyama basin, located in the southern Coast Ranges southwest of the San Andreas fault developed early in the history of the San Andreas transform system. The Miocene marine basin formed in a transtensional setting along a dextral strike-slip fault of the transform system, the San Juan-Chimineas fault following Oligocene nonmarine basin formation in an extensional setting. The lower and middle Miocene Vaqueros Formation in the northwestern part of the basin, which represents the first of two transgressive-regressive cycles, consists of eight facies making up two depositional systems. The 400-m-thick Soda Lake Shale Member constitutes a basinal system consisting of deep-basin and starved-basin facies. The overlying 2,200-m-thick Painted Rock Sandstone Member consists mostly of coarse-grained, pebbly sandstone and constitutes a Deltaic depositional system of prodelta, slope channel, delta front, tidal channel, interdistributary bay, and fluvial channel facies. The basinal depositional system consists of turbidite sand and mud, and hemipelagic and pelagic sediments that were deposited in a rapidly subsiding basin. The Deltaic depositional system prograded into the deep basin and had a steep prodelta slope that extended to bathyal depths. The delta is inferred to be a river-dominated fan delta in which coarse sediment was transported down the prodelta slopemore » into deep water by sediment gravity flows. The overall basin history and geometry of the northwestern Cuyama basin are typical of strike-slip basins. The initial rapid subsidence to bathyal depths at rates of more than 500 m/m.y. in the early Miocene is interpreted to be a result of extension at the releasing bend of a dextral strike-slip fault.« less

Christos Anagnostou - One of the best experts on this subject based on the ideXlab platform.

  • late quaternary evolution of the gulf of patras greece tectonism Deltaic Sedimentation and sea level change
    Marine Geology, 1991
    Co-Authors: George Chronis, David J W Piper, Christos Anagnostou
    Abstract:

    Abstract The Gulf of Patras is an actively subsiding late Cenozoic graben in western Greece that receives Deltaic sediment from the large Acheloos and Evinos rivers. The late Quaternary Sedimentation history of the gulf is interpreted from 3.5 kHz profiles, numerous short cores, and airgun seismic profiles. A widespread unconformity represents the isotopic stage 2 marine lowstand, when the gulf was subaerially exposed. Subsequent Deltaic progradation and associated coastal transgression was greatest during the 13-10.5 ka slowdown in sea-level rise and the period of stable sea level since the mid-Holocene. Switching of delta distributaries can be related to the known evolution of the subaerial parts of the deltas. The stage 2 unconformity provides a datum for quantitative determination of rates of subsidence. The central graben is subsiding at rates of 3–5 mm/yr; rates in the northern part of the gulf average 1–2 mm/yr. This is consistent with a listric faulting model for the origin of the modern Patras graben.