(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments
Gas hydrate on the crest of the Blake Ridge is concentrated over two depth zones: between 185 and 260 mbsf, and between 380 and 450 mbsf. Although the abundance of hydrate in the lower zone may be explained by methane cycling across the phase boundary between free gas bubbles and gas hydrate, the up...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.804226 2023-05-15T17:35:23+02:00 (Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments Kraemer, Lisa M Owen, Robert M Dickens, Gerald Roy LATITUDE: 31.785700 * LONGITUDE: -75.545900 * DATE/TIME START: 1995-11-08T12:45:00 * DATE/TIME END: 1995-11-15T01:10:00 * MINIMUM DEPTH, sediment/rock: 101.82 m * MAXIMUM DEPTH, sediment/rock: 331.69 m 2000-12-14 text/tab-separated-values, 681 data points https://doi.pangaea.de/10.1594/PANGAEA.804226 https://doi.org/10.1594/PANGAEA.804226 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.804226 https://doi.org/10.1594/PANGAEA.804226 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kraemer, Lisa M; Owen, Robert M; Dickens, Gerald Roy (2000): Lithology of the upper gas hydrate zone, Blake Outer Ridge: a link between diatoms, porosity, and gas hydrate. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-8, https://doi.org/10.2973/odp.proc.sr.164.221.2000 164-994C Atomic absorption spectrometry (AAS) Calcium carbonate Calculated Carbonate bomb (Müller & Gastner 1971) DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Instrumental neutron activation analysis (INAA) Joides Resolution Leg164 North Atlantic Ocean Ocean Drilling Program ODP Opal biogenic silica Porosity Sample code/label Scandium Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.804226 https://doi.org/10.2973/odp.proc.sr.164.221.2000 2023-01-20T09:00:02Z Gas hydrate on the crest of the Blake Ridge is concentrated over two depth zones: between 185 and 260 mbsf, and between 380 and 450 mbsf. Although the abundance of hydrate in the lower zone may be explained by methane cycling across the phase boundary between free gas bubbles and gas hydrate, the upper zone lacks a satisfactory explanation. Chemical analyses of sediment samples from Hole 994C (31º47.139'N, 75º32.753'W) were performed to determine if the relatively high hydrate accumulation between 185 and 260 mbsf coincides with an observable change in sediment composition and microporosity. Our analyses indicate a distinct change in lithology across the upper hydrate zone: the carbonate content decreases from about 25% to about 8% with a corresponding increase in siliceous microfossils and bulk porosity. An increase in the abundance of siliceous microfossils increases the size and roundness of pore spaces. Large and round pores should provide nucleation sites for gas hydrate that are uninhibited by capillary forces between grains. Upward advecting fluids that are supersaturated with methane may deposit gas hydrate as they pass through the diatom-rich depth interval. Results presented here are consistent with the hypothesis that gas hydrate distribution is influenced by sediment lithology and microporosity. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-75.545900,-75.545900,31.785700,31.785700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
164-994C Atomic absorption spectrometry (AAS) Calcium carbonate Calculated Carbonate bomb (Müller & Gastner 1971) DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Instrumental neutron activation analysis (INAA) Joides Resolution Leg164 North Atlantic Ocean Ocean Drilling Program ODP Opal biogenic silica Porosity Sample code/label Scandium |
spellingShingle |
164-994C Atomic absorption spectrometry (AAS) Calcium carbonate Calculated Carbonate bomb (Müller & Gastner 1971) DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Instrumental neutron activation analysis (INAA) Joides Resolution Leg164 North Atlantic Ocean Ocean Drilling Program ODP Opal biogenic silica Porosity Sample code/label Scandium Kraemer, Lisa M Owen, Robert M Dickens, Gerald Roy (Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
topic_facet |
164-994C Atomic absorption spectrometry (AAS) Calcium carbonate Calculated Carbonate bomb (Müller & Gastner 1971) DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Instrumental neutron activation analysis (INAA) Joides Resolution Leg164 North Atlantic Ocean Ocean Drilling Program ODP Opal biogenic silica Porosity Sample code/label Scandium |
description |
Gas hydrate on the crest of the Blake Ridge is concentrated over two depth zones: between 185 and 260 mbsf, and between 380 and 450 mbsf. Although the abundance of hydrate in the lower zone may be explained by methane cycling across the phase boundary between free gas bubbles and gas hydrate, the upper zone lacks a satisfactory explanation. Chemical analyses of sediment samples from Hole 994C (31º47.139'N, 75º32.753'W) were performed to determine if the relatively high hydrate accumulation between 185 and 260 mbsf coincides with an observable change in sediment composition and microporosity. Our analyses indicate a distinct change in lithology across the upper hydrate zone: the carbonate content decreases from about 25% to about 8% with a corresponding increase in siliceous microfossils and bulk porosity. An increase in the abundance of siliceous microfossils increases the size and roundness of pore spaces. Large and round pores should provide nucleation sites for gas hydrate that are uninhibited by capillary forces between grains. Upward advecting fluids that are supersaturated with methane may deposit gas hydrate as they pass through the diatom-rich depth interval. Results presented here are consistent with the hypothesis that gas hydrate distribution is influenced by sediment lithology and microporosity. |
format |
Dataset |
author |
Kraemer, Lisa M Owen, Robert M Dickens, Gerald Roy |
author_facet |
Kraemer, Lisa M Owen, Robert M Dickens, Gerald Roy |
author_sort |
Kraemer, Lisa M |
title |
(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
title_short |
(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
title_full |
(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
title_fullStr |
(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
title_full_unstemmed |
(Table 1) Porosity, and calcium carbonate, scandium and opal content of ODP Hole 164-994C sediments |
title_sort |
(table 1) porosity, and calcium carbonate, scandium and opal content of odp hole 164-994c sediments |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.804226 https://doi.org/10.1594/PANGAEA.804226 |
op_coverage |
LATITUDE: 31.785700 * LONGITUDE: -75.545900 * DATE/TIME START: 1995-11-08T12:45:00 * DATE/TIME END: 1995-11-15T01:10:00 * MINIMUM DEPTH, sediment/rock: 101.82 m * MAXIMUM DEPTH, sediment/rock: 331.69 m |
long_lat |
ENVELOPE(-75.545900,-75.545900,31.785700,31.785700) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Kraemer, Lisa M; Owen, Robert M; Dickens, Gerald Roy (2000): Lithology of the upper gas hydrate zone, Blake Outer Ridge: a link between diatoms, porosity, and gas hydrate. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-8, https://doi.org/10.2973/odp.proc.sr.164.221.2000 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.804226 https://doi.org/10.1594/PANGAEA.804226 |
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.804226 https://doi.org/10.2973/odp.proc.sr.164.221.2000 |
_version_ |
1766134543170928640 |