Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean
Excess 230Th dominates the alpha activity of the surface regions of manganese nodules and deep sea sediments. If uranium series eguilibrium is maintained, total alpha activity depth profiles should be as useful in determining sedimentation rates as are 230Th measurements. We have used cellulose nitr...
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Format: | Dataset |
Language: | English |
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PANGAEA
1978
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.881835 https://doi.org/10.1594/PANGAEA.881835 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.881835 |
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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 |
Aluminium Arabian Sea Atomic absorption spectrometry (AAS) Cadmium Calcium Chromium Cobalt Copper Deposit type DEPTH sediment/rock Description Dredge DRG ELT33 ELT33.017-PC ELT48 ELT48.006-PC ELT50 ELT50.036-PC ELT54 ELT54.001-PH Eltanin Event label GC Gravity corer Identification Indian Ocean Iron Lead Lithium Magnesium Manganese Molybdenum Nickel NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS PC Piston corer Shackleton Shackleton75/5 Shackleton75/5_1301a Shackleton75/5_1303a Shackleton75/5_1325a Titanium Vanadium Zinc |
spellingShingle |
Aluminium Arabian Sea Atomic absorption spectrometry (AAS) Cadmium Calcium Chromium Cobalt Copper Deposit type DEPTH sediment/rock Description Dredge DRG ELT33 ELT33.017-PC ELT48 ELT48.006-PC ELT50 ELT50.036-PC ELT54 ELT54.001-PH Eltanin Event label GC Gravity corer Identification Indian Ocean Iron Lead Lithium Magnesium Manganese Molybdenum Nickel NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS PC Piston corer Shackleton Shackleton75/5 Shackleton75/5_1301a Shackleton75/5_1303a Shackleton75/5_1325a Titanium Vanadium Zinc Andersen, M E Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
topic_facet |
Aluminium Arabian Sea Atomic absorption spectrometry (AAS) Cadmium Calcium Chromium Cobalt Copper Deposit type DEPTH sediment/rock Description Dredge DRG ELT33 ELT33.017-PC ELT48 ELT48.006-PC ELT50 ELT50.036-PC ELT54 ELT54.001-PH Eltanin Event label GC Gravity corer Identification Indian Ocean Iron Lead Lithium Magnesium Manganese Molybdenum Nickel NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS PC Piston corer Shackleton Shackleton75/5 Shackleton75/5_1301a Shackleton75/5_1303a Shackleton75/5_1325a Titanium Vanadium Zinc |
description |
Excess 230Th dominates the alpha activity of the surface regions of manganese nodules and deep sea sediments. If uranium series eguilibrium is maintained, total alpha activity depth profiles should be as useful in determining sedimentation rates as are 230Th measurements. We have used cellulose nitrate alpha track recorders pressed against manganese nodule slabs to record high resolution alpha activity "maps' of a large number of nodules. Total alpha activity profiles have also been obtained for several sediment cores. From the approximately 90 nodule profiles measured to date, 73 show simple, approximately exponential depth dependence; about 2/3 of these have inferred deposition rates of 4-10 mm/10power6 yr. Ten profiles show statistically significant breaks in slope, suggesting growth rate changes. Within single dredge hauls there is little variation in growth rates, although different portions of the same nodule sometimes exhibit different growth rates. There is no correlation between depth and measured growth rate, except for a general tendency for the few Atlantic Ocean nodules we have measured to have slightly lower rates than Pacific or Indian Ocean samples. For a number of nodules and sediments the alpha track results have been compared with 230Th-based deposition rates measured by other workers. Two nodules have 230Th rates (W. S. Broecker et al., pers. comm.) identical within errors to the alpha track determinations. A third nodule (S. Krishnaswami, pers. comm. ) and two sediment cores previously measured by Goldberg and Koide (E. Sci. and Meteoritics, 1963, p. 90} all have much slower rates based on 230Th measurements compared with the alpha track results. |
format |
Dataset |
author |
Andersen, M E |
author_facet |
Andersen, M E |
author_sort |
Andersen, M E |
title |
Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
title_short |
Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
title_full |
Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
title_fullStr |
Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
title_full_unstemmed |
Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean |
title_sort |
chemical composition of ferromanganese crusts and manganese nodules from the indian and southern ocean |
publisher |
PANGAEA |
publishDate |
1978 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.881835 https://doi.org/10.1594/PANGAEA.881835 |
op_coverage |
MEDIAN LATITUDE: -27.975308 * MEDIAN LONGITUDE: 110.136714 * SOUTH-BOUND LATITUDE: -62.092000 * WEST-BOUND LONGITUDE: 55.165000 * NORTH-BOUND LATITUDE: 6.872333 * EAST-BOUND LONGITUDE: -119.837000 * DATE/TIME START: 1968-01-01T00:00:00 * DATE/TIME END: 1975-06-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m |
long_lat |
ENVELOPE(55.165000,-119.837000,6.872333,-62.092000) |
geographic |
Southern Ocean Shackleton Pacific Indian |
geographic_facet |
Southern Ocean Shackleton Pacific Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Supplement to: Andersen, M E (1978): Accumulation rates of manganese nodules and sediments - An alpha track method [thesis]. Master thesis, University of California, San Diego, USA, unpublished |
op_relation |
Andersen, M E; MacDougall, J Douglas (1977): Accumulation rates of manganese nodules and sediments: An Alpha Track Method. Geophysical Research Letters, 4(9), 351-353, https://doi.org/10.1029/GL004i009p00351 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.881835 https://doi.org/10.1594/PANGAEA.881835 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.88183510.1029/GL004i009p0035110.7289/V52Z13FT10.7289/V53X84KN |
_version_ |
1811645625022808064 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.881835 2024-09-30T14:44:10+00:00 Chemical composition of ferromanganese crusts and manganese nodules from the Indian and Southern Ocean Andersen, M E MEDIAN LATITUDE: -27.975308 * MEDIAN LONGITUDE: 110.136714 * SOUTH-BOUND LATITUDE: -62.092000 * WEST-BOUND LONGITUDE: 55.165000 * NORTH-BOUND LATITUDE: 6.872333 * EAST-BOUND LONGITUDE: -119.837000 * DATE/TIME START: 1968-01-01T00:00:00 * DATE/TIME END: 1975-06-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 0 m * MAXIMUM DEPTH, sediment/rock: 0 m 1978 text/tab-separated-values, 789 data points https://doi.pangaea.de/10.1594/PANGAEA.881835 https://doi.org/10.1594/PANGAEA.881835 en eng PANGAEA Andersen, M E; MacDougall, J Douglas (1977): Accumulation rates of manganese nodules and sediments: An Alpha Track Method. Geophysical Research Letters, 4(9), 351-353, https://doi.org/10.1029/GL004i009p00351 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.881835 https://doi.org/10.1594/PANGAEA.881835 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Andersen, M E (1978): Accumulation rates of manganese nodules and sediments - An alpha track method [thesis]. Master thesis, University of California, San Diego, USA, unpublished Aluminium Arabian Sea Atomic absorption spectrometry (AAS) Cadmium Calcium Chromium Cobalt Copper Deposit type DEPTH sediment/rock Description Dredge DRG ELT33 ELT33.017-PC ELT48 ELT48.006-PC ELT50 ELT50.036-PC ELT54 ELT54.001-PH Eltanin Event label GC Gravity corer Identification Indian Ocean Iron Lead Lithium Magnesium Manganese Molybdenum Nickel NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS PC Piston corer Shackleton Shackleton75/5 Shackleton75/5_1301a Shackleton75/5_1303a Shackleton75/5_1325a Titanium Vanadium Zinc dataset 1978 ftpangaea https://doi.org/10.1594/PANGAEA.88183510.1029/GL004i009p0035110.7289/V52Z13FT10.7289/V53X84KN 2024-09-11T00:15:18Z Excess 230Th dominates the alpha activity of the surface regions of manganese nodules and deep sea sediments. If uranium series eguilibrium is maintained, total alpha activity depth profiles should be as useful in determining sedimentation rates as are 230Th measurements. We have used cellulose nitrate alpha track recorders pressed against manganese nodule slabs to record high resolution alpha activity "maps' of a large number of nodules. Total alpha activity profiles have also been obtained for several sediment cores. From the approximately 90 nodule profiles measured to date, 73 show simple, approximately exponential depth dependence; about 2/3 of these have inferred deposition rates of 4-10 mm/10power6 yr. Ten profiles show statistically significant breaks in slope, suggesting growth rate changes. Within single dredge hauls there is little variation in growth rates, although different portions of the same nodule sometimes exhibit different growth rates. There is no correlation between depth and measured growth rate, except for a general tendency for the few Atlantic Ocean nodules we have measured to have slightly lower rates than Pacific or Indian Ocean samples. For a number of nodules and sediments the alpha track results have been compared with 230Th-based deposition rates measured by other workers. Two nodules have 230Th rates (W. S. Broecker et al., pers. comm.) identical within errors to the alpha track determinations. A third nodule (S. Krishnaswami, pers. comm. ) and two sediment cores previously measured by Goldberg and Koide (E. Sci. and Meteoritics, 1963, p. 90} all have much slower rates based on 230Th measurements compared with the alpha track results. Dataset Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Shackleton Pacific Indian ENVELOPE(55.165000,-119.837000,6.872333,-62.092000) |