Erosion, non-deposition and sedimentary processes through a sedimentological and radioisotopic study of surficial deposits from the “Ouest-Gironde vasière” (Bay of Biscay)

Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

“…A high between-station variability in D 0.5 and Sediment Surface Area (SSA) was nevertheless recorded in this group, most likely reflecting spatial differences in the transient deposition of coarse sediments [25,26,40] as observed during the present study on the Sediment Profile Images (SPIs) collected at station 0. Therefore, our results clearly support that the stations of group I, and associated isolated stations are constitutive of the proximal part of the WGMP as stated by Jouanneau et al [35] and Lesueur et al [26,34].…”

“…Previous sedimentological surveys have shown the occurrence of two major depth gradients in the distal part [26,34,35,40,43]. The first related to the frequency of occurrence of erosional surfaces and subsequent vertical decreasing granulometric sequences (see above), and the second related to bioturbation.…”

Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

“…A high between-station variability in D 0.5 and Sediment Surface Area (SSA) was nevertheless recorded in this group, most likely reflecting spatial differences in the transient deposition of coarse sediments [25,26,40] as observed during the present study on the Sediment Profile Images (SPIs) collected at station 0. Therefore, our results clearly support that the stations of group I, and associated isolated stations are constitutive of the proximal part of the WGMP as stated by Jouanneau et al [35] and Lesueur et al [26,34].…”

“…Previous sedimentological surveys have shown the occurrence of two major depth gradients in the distal part [26,34,35,40,43]. The first related to the frequency of occurrence of erosional surfaces and subsequent vertical decreasing granulometric sequences (see above), and the second related to bioturbation.…”

Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay

“…Precipitation of Mn 2+ as reduced authigenic minerals may also take place. The sediments at shallow stations (depth around 100 m) in this studied region are strongly bioturbated (Jouanneau et al, 1989;Lesueur and Tastet, 1994), with organic carbon contents >2% (Hyacinthe et al, 2001). In such sediments, enhanced porewater DMn and DFe concentrations are likely to be produced by the decomposition of the organic matter with associated oxygen consumption and metal oxide reduction.…”

Grain Size, Total Heavy Mineral and Element Distribution and Control Factors of Current Sediments on the Floor of Hisaronu and Datca Bays

“…Currently in some shelf areas both large-grained (rich in sand and gravel) relicts and fine-grained (rich in clay and silt) current sediments are found together. In relatively high-energy coastal regions and river mouths, largegrained sediments like gravel and sand are deposited while in low-energy and open water areas silt and clay sediments commonly accumulate (Scruton, 1960;Kuehl et al, 1986;Jouanneau et al, 1989;Ergin et al, 1998;Owen, 2005). In short the study area does not just contain current sediments, but is covered by occasional relict sediments from the last glacial period.…”

Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

“…A high between-station variability in D 0.5 and Sediment Surface Area (SSA) was nevertheless recorded in this group, most likely reflecting spatial differences in the transient deposition of coarse sediments [25,26,40] as observed during the present study on the Sediment Profile Images (SPIs) collected at station 0. Therefore, our results clearly support that the stations of group I, and associated isolated stations are constitutive of the proximal part of the WGMP as stated by Jouanneau et al [35] and Lesueur et al [26,34].…”

“…Previous sedimentological surveys have shown the occurrence of two major depth gradients in the distal part [26,34,35,40,43]. The first related to the frequency of occurrence of erosional surfaces and subsequent vertical decreasing granulometric sequences (see above), and the second related to bioturbation.…”

Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay

“…Precipitation of Mn 2+ as reduced authigenic minerals may also take place. The sediments at shallow stations (depth around 100 m) in this studied region are strongly bioturbated (Jouanneau et al, 1989;Lesueur and Tastet, 1994), with organic carbon contents >2% (Hyacinthe et al, 2001). In such sediments, enhanced porewater DMn and DFe concentrations are likely to be produced by the decomposition of the organic matter with associated oxygen consumption and metal oxide reduction.…”

Grain Size, Total Heavy Mineral and Element Distribution and Control Factors of Current Sediments on the Floor of Hisaronu and Datca Bays

“…Currently in some shelf areas both large-grained (rich in sand and gravel) relicts and fine-grained (rich in clay and silt) current sediments are found together. In relatively high-energy coastal regions and river mouths, largegrained sediments like gravel and sand are deposited while in low-energy and open water areas silt and clay sediments commonly accumulate (Scruton, 1960;Kuehl et al, 1986;Jouanneau et al, 1989;Ergin et al, 1998;Owen, 2005). In short the study area does not just contain current sediments, but is covered by occasional relict sediments from the last glacial period.…”

Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

“…A high between-station variability in D 0.5 and Sediment Surface Area (SSA) was nevertheless recorded in this group, most likely reflecting spatial differences in the transient deposition of coarse sediments [25,26,40] as observed during the present study on the Sediment Profile Images (SPIs) collected at station 0. Therefore, our results clearly support that the stations of group I, and associated isolated stations are constitutive of the proximal part of the WGMP as stated by Jouanneau et al [35] and Lesueur et al [26,34].…”

“…Previous sedimentological surveys have shown the occurrence of two major depth gradients in the distal part [26,34,35,40,43]. The first related to the frequency of occurrence of erosional surfaces and subsequent vertical decreasing granulometric sequences (see above), and the second related to bioturbation.…”

Sources and transport of dissolved iron and manganese along the continental margin of the Bay of Biscay

“…Precipitation of Mn 2+ as reduced authigenic minerals may also take place. The sediments at shallow stations (depth around 100 m) in this studied region are strongly bioturbated (Jouanneau et al, 1989;Lesueur and Tastet, 1994), with organic carbon contents >2% (Hyacinthe et al, 2001). In such sediments, enhanced porewater DMn and DFe concentrations are likely to be produced by the decomposition of the organic matter with associated oxygen consumption and metal oxide reduction.…”

Grain Size, Total Heavy Mineral and Element Distribution and Control Factors of Current Sediments on the Floor of Hisaronu and Datca Bays

“…Currently in some shelf areas both large-grained (rich in sand and gravel) relicts and fine-grained (rich in clay and silt) current sediments are found together. In relatively high-energy coastal regions and river mouths, largegrained sediments like gravel and sand are deposited while in low-energy and open water areas silt and clay sediments commonly accumulate (Scruton, 1960;Kuehl et al, 1986;Jouanneau et al, 1989;Ergin et al, 1998;Owen, 2005). In short the study area does not just contain current sediments, but is covered by occasional relict sediments from the last glacial period.…”