Age model and grain size distribution of the fine fraction of ODP Site 114-704
The physical properties of sediments beneath an upwelling area in the southern part of the Atlantic Ocean (ODP Hole 704A) were investigated. Highly significant correlations characterize the relationship of carbonate content to bulk density (R = 0.85), carbonate content to porosity (R = 0.84), and ca...
Main Authors: | , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
PANGAEA
1991
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.754910 https://doi.org/10.1594/PANGAEA.754910 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.754910 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.754910 2024-09-15T18:36:28+00:00 Age model and grain size distribution of the fine fraction of ODP Site 114-704 Mienert, Jürgen Nobes, David C MEDIAN LATITUDE: -46.879250 * MEDIAN LONGITUDE: 7.420725 * SOUTH-BOUND LATITUDE: -46.880000 * WEST-BOUND LONGITUDE: 7.420500 * NORTH-BOUND LATITUDE: -46.879000 * EAST-BOUND LONGITUDE: 7.420800 * DATE/TIME START: 1987-04-25T13:30:00 * DATE/TIME END: 1987-05-03T10:14:00 1991 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.754910 https://doi.org/10.1594/PANGAEA.754910 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.754910 https://doi.org/10.1594/PANGAEA.754910 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Mienert, Jürgen; Nobes, David C (1991): Physical properties of sediments beneath Polar Front upwelling regions in the subantarctic South Atlantic (Hole 704A). In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 671-683, https://doi.org/10.2973/odp.proc.sr.114.158.1991 114-704A 114-704B DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.75491010.2973/odp.proc.sr.114.158.1991 2024-07-24T02:31:20Z The physical properties of sediments beneath an upwelling area in the southern part of the Atlantic Ocean (ODP Hole 704A) were investigated. Highly significant correlations characterize the relationship of carbonate content to bulk density (R = 0.85), carbonate content to porosity (R = 0.84), and carbonate content to impedance (R = 0.84). No relationship exists between carbonate content and compressional-wave velocity (R = 0.24), indicating that amplitude variations in impedance are primarily controlled by variations in bulk density, which, in turn, are controlled by climatically driven biogenic opal and carbonate deposition. In general, maxima in impedance correspond to maxima in carbonate content (minima in opal content). The impedance record exhibits its most drastic change at about 2.4 Ma, marking dramatic increases in the average content of biogenic opal and the beginning of large-amplitude fluctuations. Between 0.7 and 0.4 Ma carbonate content, bulk density, and grain density decrease while opal content drastically increases. Similar changes have been observed in sediments beneath an upwelling cell off northwest Africa, indicating an oceanwide enhancement in upwelling or in the calcite corrosiveness of bottom water that appears to be isochronous. Other/Unknown Material South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(7.420500,7.420800,-46.879000,-46.880000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
114-704A 114-704B DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
114-704A 114-704B DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean Mienert, Jürgen Nobes, David C Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
topic_facet |
114-704A 114-704B DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean |
description |
The physical properties of sediments beneath an upwelling area in the southern part of the Atlantic Ocean (ODP Hole 704A) were investigated. Highly significant correlations characterize the relationship of carbonate content to bulk density (R = 0.85), carbonate content to porosity (R = 0.84), and carbonate content to impedance (R = 0.84). No relationship exists between carbonate content and compressional-wave velocity (R = 0.24), indicating that amplitude variations in impedance are primarily controlled by variations in bulk density, which, in turn, are controlled by climatically driven biogenic opal and carbonate deposition. In general, maxima in impedance correspond to maxima in carbonate content (minima in opal content). The impedance record exhibits its most drastic change at about 2.4 Ma, marking dramatic increases in the average content of biogenic opal and the beginning of large-amplitude fluctuations. Between 0.7 and 0.4 Ma carbonate content, bulk density, and grain density decrease while opal content drastically increases. Similar changes have been observed in sediments beneath an upwelling cell off northwest Africa, indicating an oceanwide enhancement in upwelling or in the calcite corrosiveness of bottom water that appears to be isochronous. |
format |
Other/Unknown Material |
author |
Mienert, Jürgen Nobes, David C |
author_facet |
Mienert, Jürgen Nobes, David C |
author_sort |
Mienert, Jürgen |
title |
Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
title_short |
Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
title_full |
Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
title_fullStr |
Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
title_full_unstemmed |
Age model and grain size distribution of the fine fraction of ODP Site 114-704 |
title_sort |
age model and grain size distribution of the fine fraction of odp site 114-704 |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.754910 https://doi.org/10.1594/PANGAEA.754910 |
op_coverage |
MEDIAN LATITUDE: -46.879250 * MEDIAN LONGITUDE: 7.420725 * SOUTH-BOUND LATITUDE: -46.880000 * WEST-BOUND LONGITUDE: 7.420500 * NORTH-BOUND LATITUDE: -46.879000 * EAST-BOUND LONGITUDE: 7.420800 * DATE/TIME START: 1987-04-25T13:30:00 * DATE/TIME END: 1987-05-03T10:14:00 |
long_lat |
ENVELOPE(7.420500,7.420800,-46.879000,-46.880000) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Mienert, Jürgen; Nobes, David C (1991): Physical properties of sediments beneath Polar Front upwelling regions in the subantarctic South Atlantic (Hole 704A). In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 671-683, https://doi.org/10.2973/odp.proc.sr.114.158.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.754910 https://doi.org/10.1594/PANGAEA.754910 |
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.75491010.2973/odp.proc.sr.114.158.1991 |
_version_ |
1810480141498843136 |