(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites
The geothermal regime of the western margin of the Great Bahama Bank was examined using the bottom hole temperature and thermal conductivity measurements obtained during and after Ocean Drilling Program (ODP) Leg 166. This study focuses on the data from the drilling transect of Sites 1003 through 10...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.801656 2023-05-15T17:37:15+02:00 (Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites Nagihara, Seiichi Wang, Kelin MEDIAN LATITUDE: 24.537633 * MEDIAN LONGITUDE: -79.273000 * SOUTH-BOUND LATITUDE: 24.504200 * WEST-BOUND LONGITUDE: -79.322500 * NORTH-BOUND LATITUDE: 24.562600 * EAST-BOUND LONGITUDE: -79.235700 * DATE/TIME START: 1996-03-02T10:45:00 * DATE/TIME END: 1996-04-08T15:18:00 * MINIMUM DEPTH, sediment/rock: 406.5 m * MAXIMUM DEPTH, sediment/rock: 1295.7 m 2000-11-12 text/tab-separated-values, 28 data points https://doi.pangaea.de/10.1594/PANGAEA.801656 https://doi.org/10.1594/PANGAEA.801656 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.801656 https://doi.org/10.1594/PANGAEA.801656 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Nagihara, Seiichi; Wang, Kelin (2000): Geothermal regime of the western margin of the Great Bahama Bank. In: Swart, PK; Eberli, GP; Malone, MJ; Sarg, JF (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 166, 1-8, https://doi.org/10.2973/odp.proc.sr.166.123.2000 166-1003C 166-1005C 166-1007C Conductivity thermal DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Joides Resolution Latitude of event Leg166 Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Sample code/label Thermal conductivity meter Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.801656 https://doi.org/10.2973/odp.proc.sr.166.123.2000 2023-01-20T08:59:24Z The geothermal regime of the western margin of the Great Bahama Bank was examined using the bottom hole temperature and thermal conductivity measurements obtained during and after Ocean Drilling Program (ODP) Leg 166. This study focuses on the data from the drilling transect of Sites 1003 through 1007. These data reveal two important observational characteristics. First, temperature vs. cumulative thermal resistance profiles from all the drill sites show significant curvature in the depth range of 40 to 100 mbsf. They tend to be of concave-upward shape. Second, the conductive background heat-flow values for these five drill sites, determined from deep, linear parts of the geothermal profiles, show a systematic variation along the drilling transect. Heat flow is 43-45 mW/m**2 on the seafloor away from the bank and decreases upslope to ~35 mW/m**2. We examine three mechanisms as potential causes for the curved geothermal profiles. They are: (1) a recent increase in sedimentation rate, (2) influx of seawater into shallow sediments, and (3) temporal fluctuation of the bottom water temperature (BWT). Our analysis shows that the first mechanism is negligible. The second mechanism may explain the data from Sites 1004 and 1005. The temperature profile of Site 1006 is most easily explained by the third mechanism. We reconstruct the history of BWT at this site by solving the inverse heat conduction problem. The inversion result indicates gradual warming throughout this century by ~1°C and is agreeable to other hydrographic and climatic data from the western subtropic Atlantic. However, data from Sites 1003 and 1007 do not seem to show such trends. Therefore, none of the three mechanisms tested here explain the observations from all the drill sites. As for the lateral variation of the background heat flow along the drill transect, we believe that much of it is caused by the thermal effect of the topographic variation. We model this effect by obtaining a two-dimensional analytical solution. The model suggests that the ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-79.322500,-79.235700,24.562600,24.504200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
166-1003C 166-1005C 166-1007C Conductivity thermal DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Joides Resolution Latitude of event Leg166 Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Sample code/label Thermal conductivity meter |
spellingShingle |
166-1003C 166-1005C 166-1007C Conductivity thermal DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Joides Resolution Latitude of event Leg166 Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Sample code/label Thermal conductivity meter Nagihara, Seiichi Wang, Kelin (Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
topic_facet |
166-1003C 166-1005C 166-1007C Conductivity thermal DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Elevation of event Event label Joides Resolution Latitude of event Leg166 Longitude of event North Atlantic Ocean Ocean Drilling Program ODP Sample code/label Thermal conductivity meter |
description |
The geothermal regime of the western margin of the Great Bahama Bank was examined using the bottom hole temperature and thermal conductivity measurements obtained during and after Ocean Drilling Program (ODP) Leg 166. This study focuses on the data from the drilling transect of Sites 1003 through 1007. These data reveal two important observational characteristics. First, temperature vs. cumulative thermal resistance profiles from all the drill sites show significant curvature in the depth range of 40 to 100 mbsf. They tend to be of concave-upward shape. Second, the conductive background heat-flow values for these five drill sites, determined from deep, linear parts of the geothermal profiles, show a systematic variation along the drilling transect. Heat flow is 43-45 mW/m**2 on the seafloor away from the bank and decreases upslope to ~35 mW/m**2. We examine three mechanisms as potential causes for the curved geothermal profiles. They are: (1) a recent increase in sedimentation rate, (2) influx of seawater into shallow sediments, and (3) temporal fluctuation of the bottom water temperature (BWT). Our analysis shows that the first mechanism is negligible. The second mechanism may explain the data from Sites 1004 and 1005. The temperature profile of Site 1006 is most easily explained by the third mechanism. We reconstruct the history of BWT at this site by solving the inverse heat conduction problem. The inversion result indicates gradual warming throughout this century by ~1°C and is agreeable to other hydrographic and climatic data from the western subtropic Atlantic. However, data from Sites 1003 and 1007 do not seem to show such trends. Therefore, none of the three mechanisms tested here explain the observations from all the drill sites. As for the lateral variation of the background heat flow along the drill transect, we believe that much of it is caused by the thermal effect of the topographic variation. We model this effect by obtaining a two-dimensional analytical solution. The model suggests that the ... |
format |
Dataset |
author |
Nagihara, Seiichi Wang, Kelin |
author_facet |
Nagihara, Seiichi Wang, Kelin |
author_sort |
Nagihara, Seiichi |
title |
(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
title_short |
(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
title_full |
(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
title_fullStr |
(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
title_full_unstemmed |
(Table 1) Thermal conductivities of lithified core samples from ODP Leg 166 sites |
title_sort |
(table 1) thermal conductivities of lithified core samples from odp leg 166 sites |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.801656 https://doi.org/10.1594/PANGAEA.801656 |
op_coverage |
MEDIAN LATITUDE: 24.537633 * MEDIAN LONGITUDE: -79.273000 * SOUTH-BOUND LATITUDE: 24.504200 * WEST-BOUND LONGITUDE: -79.322500 * NORTH-BOUND LATITUDE: 24.562600 * EAST-BOUND LONGITUDE: -79.235700 * DATE/TIME START: 1996-03-02T10:45:00 * DATE/TIME END: 1996-04-08T15:18:00 * MINIMUM DEPTH, sediment/rock: 406.5 m * MAXIMUM DEPTH, sediment/rock: 1295.7 m |
long_lat |
ENVELOPE(-79.322500,-79.235700,24.562600,24.504200) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Nagihara, Seiichi; Wang, Kelin (2000): Geothermal regime of the western margin of the Great Bahama Bank. In: Swart, PK; Eberli, GP; Malone, MJ; Sarg, JF (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 166, 1-8, https://doi.org/10.2973/odp.proc.sr.166.123.2000 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.801656 https://doi.org/10.1594/PANGAEA.801656 |
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.801656 https://doi.org/10.2973/odp.proc.sr.166.123.2000 |
_version_ |
1766137071448096768 |