Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic
Measurements of Pb-210 activities, in conjunction with micropaleontological, geotechnical and sedimentological observations, on sediment cores have been used to characterize two distinctive bioturbation regimes on the continental slope and rise east of Newfoundland. On the rise (2600 m), excess Pb-2...
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Format: | Dataset |
Language: | English |
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PANGAEA
1984
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.883653 https://doi.org/10.1594/PANGAEA.883653 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.883653 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Comment Dawson Deposit type DEPTH sediment/rock Description DW77-034 DW77-034-12C DW77-034-16C Elevation of event Event label File name Identification Latitude of event Longitude of event Method/Device of event NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS North Atlantic Photo/Video Position PV Quantity of deposit Sediment type Size Substrate type Uniform resource locator/link to image Visual description |
spellingShingle |
Comment Dawson Deposit type DEPTH sediment/rock Description DW77-034 DW77-034-12C DW77-034-16C Elevation of event Event label File name Identification Latitude of event Longitude of event Method/Device of event NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS North Atlantic Photo/Video Position PV Quantity of deposit Sediment type Size Substrate type Uniform resource locator/link to image Visual description Smith, J N Schafer, C T Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
topic_facet |
Comment Dawson Deposit type DEPTH sediment/rock Description DW77-034 DW77-034-12C DW77-034-16C Elevation of event Event label File name Identification Latitude of event Longitude of event Method/Device of event NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS North Atlantic Photo/Video Position PV Quantity of deposit Sediment type Size Substrate type Uniform resource locator/link to image Visual description |
description |
Measurements of Pb-210 activities, in conjunction with micropaleontological, geotechnical and sedimentological observations, on sediment cores have been used to characterize two distinctive bioturbation regimes on the continental slope and rise east of Newfoundland. On the rise (2600 m), excess Pb-210 is confined to the upper few centimeters of the coarser-grained sediments underlying the axis of the Western Boundary Undercurrent. The geological and geochemical evidence for a low rate of bioturbation in this high bottom current regime is consistent with a reduced population of deeper burrowing macrofauna, particularly the species Maldane sarsi. In contrast, a higher flux of organic-rich, fine-grained particulate material to the middle slope (1500 m water depth), and the comparatively stable sedimentological conditions that prevail in this low bottom current regime, have led to the active colonization of the sediment substrate by bioturbating organisms. Enhanced mixing of middle slope deposits is reflected by comparatively lower shear strengths within the upper 30 cm of the sediment column, and by the reduced variability of the sediment-depth distribution of the most abundant species of foraminifera. Excess Pb-210 has been transported downward from the sediment-water interface to depths greater than 12 cm. Some Pb-210 profiles from the middle slope can be interpreted in terms of a diffusion mixing model for which the biological mixing coefficients are of the order of 0.10-1.0 cm2/yr.Measurements of the two and three dimensional distribution of excess Pb-210 in one middle slope box core indicate that the mixing process in these sediments has a pronounced heterogeneous component on time scales of the same order as the half life of Pb-210 (22.3 yr). Spatial correlations between Pb-210 anomalies and artifacts of bioturbation observed in x-radiographs of the core suggest that Pb-210 maxima observed at depth may be the result of an inclined orientation of burrow structures which have introduced a significant lateral ... |
format |
Dataset |
author |
Smith, J N Schafer, C T |
author_facet |
Smith, J N Schafer, C T |
author_sort |
Smith, J N |
title |
Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
title_short |
Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
title_full |
Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
title_fullStr |
Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
title_full_unstemmed |
Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic |
title_sort |
annotated record of the detailed examination of mn deposits off newfoundland, north atlantic |
publisher |
PANGAEA |
publishDate |
1984 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.883653 https://doi.org/10.1594/PANGAEA.883653 |
op_coverage |
MEDIAN LATITUDE: 49.623334 * MEDIAN LONGITUDE: -47.393333 * SOUTH-BOUND LATITUDE: 49.500000 * WEST-BOUND LONGITUDE: -48.220000 * NORTH-BOUND LATITUDE: 49.746667 * EAST-BOUND LONGITUDE: -46.566667 * DATE/TIME START: 1977-11-11T00:00:00 * DATE/TIME END: 1977-11-12T00:00:00 * MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m |
long_lat |
ENVELOPE(-48.220000,-46.566667,49.746667,49.500000) |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Supplement to: Smith, J N; Schafer, C T (1984): Bioturbation processes in continental slope and rise sediments delineated by Pb?210, microfossil and textural indicators. Journal of Marine Research, 42(4), 1117-1145, https://doi.org/10.1357/002224084788520738 |
op_relation |
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN https://doi.pangaea.de/10.1594/PANGAEA.883653 https://doi.org/10.1594/PANGAEA.883653 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.883653 https://doi.org/10.1357/002224084788520738 https://doi.org/10.7289/V52Z13FT https://doi.org/10.7289/V53X84KN |
_version_ |
1766109094793445376 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.883653 2023-05-15T17:22:26+02:00 Annotated record of the detailed examination of Mn deposits off Newfoundland, North Atlantic Smith, J N Schafer, C T MEDIAN LATITUDE: 49.623334 * MEDIAN LONGITUDE: -47.393333 * SOUTH-BOUND LATITUDE: 49.500000 * WEST-BOUND LONGITUDE: -48.220000 * NORTH-BOUND LATITUDE: 49.746667 * EAST-BOUND LONGITUDE: -46.566667 * DATE/TIME START: 1977-11-11T00:00:00 * DATE/TIME END: 1977-11-12T00:00:00 * MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m 1984-11-30 text/tab-separated-values, 21 data points https://doi.pangaea.de/10.1594/PANGAEA.883653 https://doi.org/10.1594/PANGAEA.883653 en eng PANGAEA Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN https://doi.pangaea.de/10.1594/PANGAEA.883653 https://doi.org/10.1594/PANGAEA.883653 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Smith, J N; Schafer, C T (1984): Bioturbation processes in continental slope and rise sediments delineated by Pb?210, microfossil and textural indicators. Journal of Marine Research, 42(4), 1117-1145, https://doi.org/10.1357/002224084788520738 Comment Dawson Deposit type DEPTH sediment/rock Description DW77-034 DW77-034-12C DW77-034-16C Elevation of event Event label File name Identification Latitude of event Longitude of event Method/Device of event NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS North Atlantic Photo/Video Position PV Quantity of deposit Sediment type Size Substrate type Uniform resource locator/link to image Visual description Dataset 1984 ftpangaea https://doi.org/10.1594/PANGAEA.883653 https://doi.org/10.1357/002224084788520738 https://doi.org/10.7289/V52Z13FT https://doi.org/10.7289/V53X84KN 2023-01-20T09:10:02Z Measurements of Pb-210 activities, in conjunction with micropaleontological, geotechnical and sedimentological observations, on sediment cores have been used to characterize two distinctive bioturbation regimes on the continental slope and rise east of Newfoundland. On the rise (2600 m), excess Pb-210 is confined to the upper few centimeters of the coarser-grained sediments underlying the axis of the Western Boundary Undercurrent. The geological and geochemical evidence for a low rate of bioturbation in this high bottom current regime is consistent with a reduced population of deeper burrowing macrofauna, particularly the species Maldane sarsi. In contrast, a higher flux of organic-rich, fine-grained particulate material to the middle slope (1500 m water depth), and the comparatively stable sedimentological conditions that prevail in this low bottom current regime, have led to the active colonization of the sediment substrate by bioturbating organisms. Enhanced mixing of middle slope deposits is reflected by comparatively lower shear strengths within the upper 30 cm of the sediment column, and by the reduced variability of the sediment-depth distribution of the most abundant species of foraminifera. Excess Pb-210 has been transported downward from the sediment-water interface to depths greater than 12 cm. Some Pb-210 profiles from the middle slope can be interpreted in terms of a diffusion mixing model for which the biological mixing coefficients are of the order of 0.10-1.0 cm2/yr.Measurements of the two and three dimensional distribution of excess Pb-210 in one middle slope box core indicate that the mixing process in these sediments has a pronounced heterogeneous component on time scales of the same order as the half life of Pb-210 (22.3 yr). Spatial correlations between Pb-210 anomalies and artifacts of bioturbation observed in x-radiographs of the core suggest that Pb-210 maxima observed at depth may be the result of an inclined orientation of burrow structures which have introduced a significant lateral ... Dataset Newfoundland North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-48.220000,-46.566667,49.746667,49.500000) |