The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Noel P James - One of the best experts on this subject based on the ideXlab platform.

  • genesis of palimpsest cool water Carbonate Sediment on the continental margin of southern australia
    Journal of Sedimentary Research, 2007
    Co-Authors: John M Rivers, Noel P James, Kurt T Kyser, Yvonne Bone
    Abstract:

    Abstract The continental margin of southern Australia is a site of extensive Quaternary cool-water Carbonate Sedimentation. Seafloor Sediments are a mixture of Holocene biofragments and late Pleistocene relict and stranded particles. Relict Sediments, produced during Marine Isotope Stages 3 and 4, are generally preserved as iron-stained intraclasts. Such grains in the Great Australian Bight are photozoan in character. They include symbiont-bearing benthic foraminifers and coralline algal particles, and indicate that the wide shelves were bathed in shallow, relatively warm, oligotrophic waters and floored by marine grasses, similar to many modern shallow inboard embayments in the region today. In contrast, east of the Great Australian Bight relict Sediments are more heterozoan in character, with coralline algal and molluscan facies on the inner shelf and bryozoan Sediments on the outer shelf. Stranded Sediments, marooned during the sea-level rise associated with Marine Isotope Stage 2, are gray to buff in color and composed of both biofragments and intraclasts. These particles are mainly heterozoan in character throughout the region, with subtropical photozoan marine grassbank facies localized to portions of the inner Great Australian Bight. Stranded Sediments are interpreted to have accumulated in an areally restricted photic zone and upon an overall narrow shelf covered in cool, nutrient-rich waters. Swell-driven seafloor Sediment disturbance to depths of 100 m along the southern Australian margin in conjunction with reduced rates of Sedimentation that characterize the cool-water Carbonate realm, have resulted in mixing of Sediment currently being produced with exhumed relict and stranded Sediments generated during previous sea-level stands. The composition of these deposits and the nature of their pre-burial alteration are a function of sea-level history. Late Pleistocene relict Sediments originally accumulated in low-energy, inboard environments but were modified in the surf zone during subsequent sea-level fluctuations. This resulted in the formation of intraclasts: abraded, infilled, and cemented biofragments of local origin. The widespread distribution of intraclasts and of composite grain assemblages derived from multiple Sedimentary environments that display highly variable degrees of seafloor alteration may be signatures of modern cool-water Carbonate assemblages worldwide. While such palimpsest Sediments may complicate paleoenvironmental interpretation, their differentiation in the rock record can be utilized to discern subtleties in paleoceanography and sea-level history.

  • the interactions of sea level change terrigenous Sediment influx and Carbonate productivity as controls on upper cambrian grand cycles of western newfoundland canada
    Geological Society of America Bulletin, 1993
    Co-Authors: Clinton A Cowan, Noel P James
    Abstract:

    The Upper Cambrian stratal record in western Newfoundland is complex and reflects the interplay and feedback between (1) changes in third-order sea level, (2) episodic incursion of terrigenous fines onto the paleoshelf, and (3) productivity levels of the ancient Carbonate factory. Mixed Carbonate and terrigenous clastic rocks of western Newfoundland are configured in large-scale, third-order stratal patterns called "Grand Cycles" (such cycles are tens to hundreds of meters in stratigraphic thickness and appear to span millions of years). Grand Cycles are divided here into ribbon half-cycles (composed principally of ribbon rock) and oolitic half-cycles (dominated by oolite). Stratigraphic distribution of shale in these rocks, however, is not everywhere coincident with large- and small-scale patterns in Carbonate lithofacies, and it suggests that the incursion of terrigenous clay and silt onto the ancient platform must be evaluated separately, in part, from the dynamics of Carbonate accumulation. Areal and stratigraphic distribution of rock cycles record shifts in facies belts on the ancient platform, presumably in response to third-order changes in accommodation potential. Meter-scale cycles in Carbonate lithofacies are of two types: peritidal cycles that fine upward, and shelf cycles that coarsen upward. Thick successions of shelf cycles composed of ribbon rock are interpreted as highstand deposits and are separated (by a sequence boundary marked by peritidal cycles) from lowstand deposits comprising thick successions of ootite shelf cycles. The former mid-Grand Cycle transitions of previous workers are thereby reinterpreted in this study as sequence boundaries. The long-term position of sea level, and thus the degree of platform inundation, influenced the health of the platform Carbonate factory. During times of low sea level, the platform was bathed in water more saline than open-ocean sea water, and it had a robust non- skeletal Carbonate factory that was resilient to poisoning by episodic influx of terrigenous fines onto the shelf. In contrast, the Carbonate factory during highstands was less resilient to terrigenous poisoning and was susceptible to localized drowning by the reduction in the rate of Carbonate-Sediment production. The thick shale units are therefore interpreted to represent the coincidence of (and interaction between) (1) incursion of terrigenous fines onto the ancient platform and (2) a weakened highstand Carbonate factory unable to recover from this terrigenous poisoning.

  • bryozoans as Carbonate Sediment producers on the cool water lacepede shelf southern australia
    Sedimentary Geology, 1993
    Co-Authors: Yvonne Bone, Noel P James
    Abstract:

    Modern Sediments on the Lacepede Shelf and adjacent slope are typical mid-latitude, cool-water, palimpsest deposits, dominated by bryozoan, mollusc and quartz particles. Bryozoan bioclasts form autochthonous and, to a lesser extent, allochthonous accumulations across the grain-size spectrum, from mud to boulder size. The bryozoan skeletons are grouped, on the basis of architecture and style of disarticulation/fragmentation, into nine morphotypes. Erect rigid forms comprise (1) fenestrate, (2) foliose, (3) flat, robust branching and (4) delicate, branching morphotypes. Large Adeona sp. skeletons are recognised as a separate type of fenestrate form because of their distinctive shape, mineralogy and restricted environment. Erect flexible forms are either (5) articulated branching or (6) articulated zooidal. Other important morphotypes are (7) encrusting, (8) nodular/ arborescent and (9) vagrant. Differences in skeletal architecture result in distinct particle types. Encrusting morphotypes on soft organic substrates and the wide variety of erect rigid forms are broken into fragments. Erect flexible forms disintegrate upon death into definitive sand and silt size grains. Encrusting morphotypes on hard substrates, nodular/arborescent and vagrant forms remain whole, and when large, accumulate in place. Morphotypes are mineralogically distinct and so bryozoan Sediment composition is environmentally controlled. Shallow water (< 130 m), high-energy bryozoan deposits are intermediate Mg-calcite (4–12 mol% MgCO3) and aragonite bryozoan grains. Deeper-water, outer-shelf, shelf-edge and upper slope bryozoan Sediments are predominantly low to intermediate Mg-calcite in composition, with minor aragonite particles.

Gilbert Camoin - One of the best experts on this subject based on the ideXlab platform.

  • from platform top to adjacent deep sea new source to sink insights into Carbonate Sediment production and transfer in the sw indian ocean glorieuses archipelago
    Marine Geology, 2020
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, Gilbert Camoin
    Abstract:

    Abstract Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the tectonic, climatic and other processes that shape the landscape from mountains to the deep ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed systems, for which the connection between drainage basins, continental shelves, slope and basin environments are often well constrained. Here we present a study focusing on a source-to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the Carbonate platform have allowed us to estimate the composition, the lateral variability, and volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric surveys across the platform interior illustrate the presence of plurimetric sandy bodies deposited along the leeward platform edge, corresponding to the export of Carbonate Sediments from the platform top toward the platform edge, under the influence of dominant currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment cores acquired along the leeward slope and basin adjacent to the Carbonate platform highlight the presence of channel-levee complexes and turbiditic lobes, which have accumulated on the seafloor on top of a 250 m-thick Sedimentary basin at 2000–3400 m water depth. Our study points out that Carbonate sands and aragonitic mud produced on the platform top during the Holocene have been shed to the adjacent basin. We also demonstrate that this routing system was active at least throughout the last three glacial/interglacial cycles. This study has important consequences for our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated Carbonate platforms: 1 - it highlights the role of oceanographic conditions in the distribution of Sediment on a platform top and its export along the platform edge and the adjacent basin; 2 - it contributes to quantify the productivity of a Carbonate platform as well as its Sediment storage capacity; 3 - a first estimate of a Carbonate source-to-sink system is proposed, demonstrating that 0,57 km3 of Sediments have been produced during the Holocene, 0,3 km3 being presently stored on the platform, and the remaining having been exported to the deep basin.

  • From platform top to adjacent deep sea: new source-to-sink insights into Carbonate Sediment production and transfer in the SW Indian Ocean 2 (Glorieuses archipelago)
    Marine Geology, 2019
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, P Le Roy, Gilbert Camoin
    Abstract:

    18 19 Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the 20 tectonic, climatic and other processes that shape the landscape from mountains to the deep 21 ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed 22 systems, for which the connection between drainage basins, continental shelves, slope and 23 basin environments are often well constrained. Here we present a study focusing on a source-24 to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean 25 (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the 26 Carbonate platform have allowed us to estimate the composition, the lateral variability, and 27 volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric 28 surveys across the platform interior illustrate the presence of plurimetric sandy bodies 29 deposited along the leeward platform edge, corresponding to the export of Carbonate 30 Sediments from the platform top toward the platform edge, under the influence of dominant 31 currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment 32 cores acquired along slope and basin adjacent to the Carbonate platform highlight the presence 33 of channel-levee complexes and turbiditic lobes, which have accumulated on top of a 250m-34 thick Sedimentary basin at 2000-3400 m water depth. Our study points out that a half of 35 Carbonate sands and aragonitic mud have been shed from the platform top to the adjacent 36 basin during the Holocene. We also demonstrate that this routing system was active at least 37 through the last three glacial/interglacial cycles. This study has important consequences for 38 our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated 39 Carbonate platforms, and contributes to a first quantification of a Carbonate source-to-sink 40 system. 41 42

Stéphan Jorry - One of the best experts on this subject based on the ideXlab platform.

  • from platform top to adjacent deep sea new source to sink insights into Carbonate Sediment production and transfer in the sw indian ocean glorieuses archipelago
    Marine Geology, 2020
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, Gilbert Camoin
    Abstract:

    Abstract Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the tectonic, climatic and other processes that shape the landscape from mountains to the deep ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed systems, for which the connection between drainage basins, continental shelves, slope and basin environments are often well constrained. Here we present a study focusing on a source-to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the Carbonate platform have allowed us to estimate the composition, the lateral variability, and volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric surveys across the platform interior illustrate the presence of plurimetric sandy bodies deposited along the leeward platform edge, corresponding to the export of Carbonate Sediments from the platform top toward the platform edge, under the influence of dominant currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment cores acquired along the leeward slope and basin adjacent to the Carbonate platform highlight the presence of channel-levee complexes and turbiditic lobes, which have accumulated on the seafloor on top of a 250 m-thick Sedimentary basin at 2000–3400 m water depth. Our study points out that Carbonate sands and aragonitic mud produced on the platform top during the Holocene have been shed to the adjacent basin. We also demonstrate that this routing system was active at least throughout the last three glacial/interglacial cycles. This study has important consequences for our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated Carbonate platforms: 1 - it highlights the role of oceanographic conditions in the distribution of Sediment on a platform top and its export along the platform edge and the adjacent basin; 2 - it contributes to quantify the productivity of a Carbonate platform as well as its Sediment storage capacity; 3 - a first estimate of a Carbonate source-to-sink system is proposed, demonstrating that 0,57 km3 of Sediments have been produced during the Holocene, 0,3 km3 being presently stored on the platform, and the remaining having been exported to the deep basin.

  • From platform top to adjacent deep sea: new source-to-sink insights into Carbonate Sediment production and transfer in the SW Indian Ocean 2 (Glorieuses archipelago)
    Marine Geology, 2019
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, P Le Roy, Gilbert Camoin
    Abstract:

    18 19 Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the 20 tectonic, climatic and other processes that shape the landscape from mountains to the deep 21 ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed 22 systems, for which the connection between drainage basins, continental shelves, slope and 23 basin environments are often well constrained. Here we present a study focusing on a source-24 to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean 25 (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the 26 Carbonate platform have allowed us to estimate the composition, the lateral variability, and 27 volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric 28 surveys across the platform interior illustrate the presence of plurimetric sandy bodies 29 deposited along the leeward platform edge, corresponding to the export of Carbonate 30 Sediments from the platform top toward the platform edge, under the influence of dominant 31 currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment 32 cores acquired along slope and basin adjacent to the Carbonate platform highlight the presence 33 of channel-levee complexes and turbiditic lobes, which have accumulated on top of a 250m-34 thick Sedimentary basin at 2000-3400 m water depth. Our study points out that a half of 35 Carbonate sands and aragonitic mud have been shed from the platform top to the adjacent 36 basin during the Holocene. We also demonstrate that this routing system was active at least 37 through the last three glacial/interglacial cycles. This study has important consequences for 38 our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated 39 Carbonate platforms, and contributes to a first quantification of a Carbonate source-to-sink 40 system. 41 42

Simon Courgeon - One of the best experts on this subject based on the ideXlab platform.

  • from platform top to adjacent deep sea new source to sink insights into Carbonate Sediment production and transfer in the sw indian ocean glorieuses archipelago
    Marine Geology, 2020
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, Gilbert Camoin
    Abstract:

    Abstract Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the tectonic, climatic and other processes that shape the landscape from mountains to the deep ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed systems, for which the connection between drainage basins, continental shelves, slope and basin environments are often well constrained. Here we present a study focusing on a source-to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the Carbonate platform have allowed us to estimate the composition, the lateral variability, and volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric surveys across the platform interior illustrate the presence of plurimetric sandy bodies deposited along the leeward platform edge, corresponding to the export of Carbonate Sediments from the platform top toward the platform edge, under the influence of dominant currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment cores acquired along the leeward slope and basin adjacent to the Carbonate platform highlight the presence of channel-levee complexes and turbiditic lobes, which have accumulated on the seafloor on top of a 250 m-thick Sedimentary basin at 2000–3400 m water depth. Our study points out that Carbonate sands and aragonitic mud produced on the platform top during the Holocene have been shed to the adjacent basin. We also demonstrate that this routing system was active at least throughout the last three glacial/interglacial cycles. This study has important consequences for our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated Carbonate platforms: 1 - it highlights the role of oceanographic conditions in the distribution of Sediment on a platform top and its export along the platform edge and the adjacent basin; 2 - it contributes to quantify the productivity of a Carbonate platform as well as its Sediment storage capacity; 3 - a first estimate of a Carbonate source-to-sink system is proposed, demonstrating that 0,57 km3 of Sediments have been produced during the Holocene, 0,3 km3 being presently stored on the platform, and the remaining having been exported to the deep basin.

  • From platform top to adjacent deep sea: new source-to-sink insights into Carbonate Sediment production and transfer in the SW Indian Ocean 2 (Glorieuses archipelago)
    Marine Geology, 2019
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, P Le Roy, Gilbert Camoin
    Abstract:

    18 19 Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the 20 tectonic, climatic and other processes that shape the landscape from mountains to the deep 21 ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed 22 systems, for which the connection between drainage basins, continental shelves, slope and 23 basin environments are often well constrained. Here we present a study focusing on a source-24 to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean 25 (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the 26 Carbonate platform have allowed us to estimate the composition, the lateral variability, and 27 volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric 28 surveys across the platform interior illustrate the presence of plurimetric sandy bodies 29 deposited along the leeward platform edge, corresponding to the export of Carbonate 30 Sediments from the platform top toward the platform edge, under the influence of dominant 31 currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment 32 cores acquired along slope and basin adjacent to the Carbonate platform highlight the presence 33 of channel-levee complexes and turbiditic lobes, which have accumulated on top of a 250m-34 thick Sedimentary basin at 2000-3400 m water depth. Our study points out that a half of 35 Carbonate sands and aragonitic mud have been shed from the platform top to the adjacent 36 basin during the Holocene. We also demonstrate that this routing system was active at least 37 through the last three glacial/interglacial cycles. This study has important consequences for 38 our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated 39 Carbonate platforms, and contributes to a first quantification of a Carbonate source-to-sink 40 system. 41 42

Elda Miramontes - One of the best experts on this subject based on the ideXlab platform.

  • from platform top to adjacent deep sea new source to sink insights into Carbonate Sediment production and transfer in the sw indian ocean glorieuses archipelago
    Marine Geology, 2020
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, Gilbert Camoin
    Abstract:

    Abstract Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the tectonic, climatic and other processes that shape the landscape from mountains to the deep ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed systems, for which the connection between drainage basins, continental shelves, slope and basin environments are often well constrained. Here we present a study focusing on a source-to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the Carbonate platform have allowed us to estimate the composition, the lateral variability, and volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric surveys across the platform interior illustrate the presence of plurimetric sandy bodies deposited along the leeward platform edge, corresponding to the export of Carbonate Sediments from the platform top toward the platform edge, under the influence of dominant currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment cores acquired along the leeward slope and basin adjacent to the Carbonate platform highlight the presence of channel-levee complexes and turbiditic lobes, which have accumulated on the seafloor on top of a 250 m-thick Sedimentary basin at 2000–3400 m water depth. Our study points out that Carbonate sands and aragonitic mud produced on the platform top during the Holocene have been shed to the adjacent basin. We also demonstrate that this routing system was active at least throughout the last three glacial/interglacial cycles. This study has important consequences for our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated Carbonate platforms: 1 - it highlights the role of oceanographic conditions in the distribution of Sediment on a platform top and its export along the platform edge and the adjacent basin; 2 - it contributes to quantify the productivity of a Carbonate platform as well as its Sediment storage capacity; 3 - a first estimate of a Carbonate source-to-sink system is proposed, demonstrating that 0,57 km3 of Sediments have been produced during the Holocene, 0,3 km3 being presently stored on the platform, and the remaining having been exported to the deep basin.

  • From platform top to adjacent deep sea: new source-to-sink insights into Carbonate Sediment production and transfer in the SW Indian Ocean 2 (Glorieuses archipelago)
    Marine Geology, 2019
    Co-Authors: Stéphan Jorry, Gwenael Jouet, Evan N. Edinger, Samuel Toucanne, J Counts, Elda Miramontes, Simon Courgeon, Natalia Vazquez Riveiros, P Le Roy, Gilbert Camoin
    Abstract:

    18 19 Over the past ten years, a huge amount of source-to-sink studies have aimed to unravel the 20 tectonic, climatic and other processes that shape the landscape from mountains to the deep 21 ocean. Interestingly, these studies have been mainly dedicated to siliciclastic or mixed 22 systems, for which the connection between drainage basins, continental shelves, slope and 23 basin environments are often well constrained. Here we present a study focusing on a source-24 to-sink study dedicated to a pure Carbonate system, located in the SW Indian Ocean 25 (Glorieuses archipelago). Extensive field sampling and geophysical acquisition across the 26 Carbonate platform have allowed us to estimate the composition, the lateral variability, and 27 volumes of neritic sands deposited on the platform top. Additional seismic and bathymetric 28 surveys across the platform interior illustrate the presence of plurimetric sandy bodies 29 deposited along the leeward platform edge, corresponding to the export of Carbonate 30 Sediments from the platform top toward the platform edge, under the influence of dominant 31 currents and wind-driven processes. High-resolution seismic, bathymetric data and Sediment 32 cores acquired along slope and basin adjacent to the Carbonate platform highlight the presence 33 of channel-levee complexes and turbiditic lobes, which have accumulated on top of a 250m-34 thick Sedimentary basin at 2000-3400 m water depth. Our study points out that a half of 35 Carbonate sands and aragonitic mud have been shed from the platform top to the adjacent 36 basin during the Holocene. We also demonstrate that this routing system was active at least 37 through the last three glacial/interglacial cycles. This study has important consequences for 38 our understanding of Carbonate Sedimentation processes occurring in the vicinity of isolated 39 Carbonate platforms, and contributes to a first quantification of a Carbonate source-to-sink 40 system. 41 42