Sediment composition and sedimentation rates of four Holes in ODP Leg 166
To date, work on the Great Bahama Bank's western, leeward margin has centred chiefly on seismic-scale expressions of carbonate sequences and systems tracts. However, periplatform, slope sediments also exhibit very well developed cyclicity on scales of decimetres to several metres. It is these s...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.742513 2024-09-15T18:24:28+00:00 Sediment composition and sedimentation rates of four Holes in ODP Leg 166 Rendle-Bühring, Rebecca Reijmer, John J G MEDIAN LATITUDE: 24.485725 * MEDIAN LONGITUDE: -79.341765 * SOUTH-BOUND LATITUDE: 24.399800 * WEST-BOUND LONGITUDE: -79.459000 * NORTH-BOUND LATITUDE: 24.562900 * EAST-BOUND LONGITUDE: -79.235700 * DATE/TIME START: 1996-02-28T13:12:00 * DATE/TIME END: 1996-03-30T17:45:00 2002 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.742513 https://doi.org/10.1594/PANGAEA.742513 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.742513 https://doi.org/10.1594/PANGAEA.742513 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Rendle-Bühring, Rebecca; Reijmer, John J G (2002): Quaternary slope development of the western, leeward margin of the Great Bahama Bank. Marine Geology, 185(1-2), 121-142, https://doi.org/10.1016/S0025-3227(01)00294-8 166-1003A 166-1005A 166-1006A 166-1007B DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2002 ftpangaea https://doi.org/10.1594/PANGAEA.74251310.1016/S0025-3227(01)00294-8 2024-08-21T00:02:25Z To date, work on the Great Bahama Bank's western, leeward margin has centred chiefly on seismic-scale expressions of carbonate sequences and systems tracts. However, periplatform, slope sediments also exhibit very well developed cyclicity on scales of decimetres to several metres. It is these small-scale, high-frequency cycles within the larger-scale facies successions of the Quaternary which form the main topic of this paper. Previous studies have shown that the small-scale cycles correlate to the orbitally forced, high-frequency sea-level changes. Therefore these cycles should indicate how sea level has affected the slope development and thus platform-margin evolution during this period. Through detailed, high-resolution sequence stratigraphy of the Great Bahama Bank's leeward margin, obtained via delta18O isotope and mineralogical (XRD) analyses, confined by U/Th dating and nannofossil bioevents, a greater understanding of the bedding geometries within the Pleistocene-Holocene seismic sequences and clues as to the nature of the slope development has been achieved. The high-resolution seismic profiles indicate that since the Plio-Pleistocene change in geometry, in which the Great Bahama Bank developed into a rimmed platform, continued steepening and subsequent progradation of the leeward margin has typified slope development during the Quaternary, which is described as an accretionary slope. However, on the basis of our observations we conclude that only the early to lower middle Pleistocene section (isotope stages 45-20) and the Holocene (isotope stage 1) of the leeward margin is accretionary. This indicates that a degree of erosion and/or by-passing has occurred on the leeward margin since the lower middle Pleistocene (isotope stage 19). During the first part of this period (isotope stages 19-12) erosion and/or by-passing occurred in the middle to lower slope regions and toe-of-slope. By the end of the upper middle to late Pleistocene phase (isotope stages 11-2) erosion also occurred on the upper slope. This ... Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-79.459000,-79.235700,24.562900,24.399800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
166-1003A 166-1005A 166-1006A 166-1007B DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
166-1003A 166-1005A 166-1006A 166-1007B DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP Rendle-Bühring, Rebecca Reijmer, John J G Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
topic_facet |
166-1003A 166-1005A 166-1006A 166-1007B DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP |
description |
To date, work on the Great Bahama Bank's western, leeward margin has centred chiefly on seismic-scale expressions of carbonate sequences and systems tracts. However, periplatform, slope sediments also exhibit very well developed cyclicity on scales of decimetres to several metres. It is these small-scale, high-frequency cycles within the larger-scale facies successions of the Quaternary which form the main topic of this paper. Previous studies have shown that the small-scale cycles correlate to the orbitally forced, high-frequency sea-level changes. Therefore these cycles should indicate how sea level has affected the slope development and thus platform-margin evolution during this period. Through detailed, high-resolution sequence stratigraphy of the Great Bahama Bank's leeward margin, obtained via delta18O isotope and mineralogical (XRD) analyses, confined by U/Th dating and nannofossil bioevents, a greater understanding of the bedding geometries within the Pleistocene-Holocene seismic sequences and clues as to the nature of the slope development has been achieved. The high-resolution seismic profiles indicate that since the Plio-Pleistocene change in geometry, in which the Great Bahama Bank developed into a rimmed platform, continued steepening and subsequent progradation of the leeward margin has typified slope development during the Quaternary, which is described as an accretionary slope. However, on the basis of our observations we conclude that only the early to lower middle Pleistocene section (isotope stages 45-20) and the Holocene (isotope stage 1) of the leeward margin is accretionary. This indicates that a degree of erosion and/or by-passing has occurred on the leeward margin since the lower middle Pleistocene (isotope stage 19). During the first part of this period (isotope stages 19-12) erosion and/or by-passing occurred in the middle to lower slope regions and toe-of-slope. By the end of the upper middle to late Pleistocene phase (isotope stages 11-2) erosion also occurred on the upper slope. This ... |
format |
Other/Unknown Material |
author |
Rendle-Bühring, Rebecca Reijmer, John J G |
author_facet |
Rendle-Bühring, Rebecca Reijmer, John J G |
author_sort |
Rendle-Bühring, Rebecca |
title |
Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
title_short |
Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
title_full |
Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
title_fullStr |
Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
title_full_unstemmed |
Sediment composition and sedimentation rates of four Holes in ODP Leg 166 |
title_sort |
sediment composition and sedimentation rates of four holes in odp leg 166 |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.742513 https://doi.org/10.1594/PANGAEA.742513 |
op_coverage |
MEDIAN LATITUDE: 24.485725 * MEDIAN LONGITUDE: -79.341765 * SOUTH-BOUND LATITUDE: 24.399800 * WEST-BOUND LONGITUDE: -79.459000 * NORTH-BOUND LATITUDE: 24.562900 * EAST-BOUND LONGITUDE: -79.235700 * DATE/TIME START: 1996-02-28T13:12:00 * DATE/TIME END: 1996-03-30T17:45:00 |
long_lat |
ENVELOPE(-79.459000,-79.235700,24.562900,24.399800) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Rendle-Bühring, Rebecca; Reijmer, John J G (2002): Quaternary slope development of the western, leeward margin of the Great Bahama Bank. Marine Geology, 185(1-2), 121-142, https://doi.org/10.1016/S0025-3227(01)00294-8 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.742513 https://doi.org/10.1594/PANGAEA.742513 |
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.74251310.1016/S0025-3227(01)00294-8 |
_version_ |
1810464834672656384 |