Mineralogy and interstitial-water chemistry of ODP Leg 101 sites
Concentrations of dissolved Ca2+, Sr2+, Mg2+, SO4[2-], and alkalinity were measured in pore waters squeezed from sediments taken from ODP Holes 626C and 626D in the Florida Straits; Holes 627A and 627B, 628A, and 630A and 630C north of Little Bahama Bank; Holes 631 A, 632A and 632B, and 633A in Exum...
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1988
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.742896 https://doi.org/10.1594/PANGAEA.742896 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.742896 2023-05-15T17:37:11+02:00 Mineralogy and interstitial-water chemistry of ODP Leg 101 sites Swart, Peter K Guzikowski, Michael MEDIAN LATITUDE: 25.423004 * MEDIAN LONGITUDE: -77.367868 * SOUTH-BOUND LATITUDE: 23.586700 * WEST-BOUND LONGITUDE: -79.546760 * NORTH-BOUND LATITUDE: 27.635000 * EAST-BOUND LONGITUDE: -75.435500 * DATE/TIME START: 1985-02-03T07:15:00 * DATE/TIME END: 1985-03-08T18:45:00 1988-07-07 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.742896 https://doi.org/10.1594/PANGAEA.742896 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.742896 https://doi.org/10.1594/PANGAEA.742896 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Swart, Peter K; Guzikowski, Michael (1988): Interstitial-water chemistry and diagenesis of periplatform sediments from the Bahamas, ODP Leg 101. In: Austin, JA Jr.; Schlager, W; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 101, 363-380, https://doi.org/10.2973/odp.proc.sr.101.158.1988 101-626C 101-626D 101-627A 101-627B 101-628A 101-630A 101-630B 101-630C 101-631A 101-632 101-632A 101-632B 101-633A 101-634A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg101 North Atlantic Ocean Ocean Drilling Program ODP Dataset 1988 ftpangaea https://doi.org/10.1594/PANGAEA.742896 https://doi.org/10.2973/odp.proc.sr.101.158.1988 2023-01-20T07:31:50Z Concentrations of dissolved Ca2+, Sr2+, Mg2+, SO4[2-], and alkalinity were measured in pore waters squeezed from sediments taken from ODP Holes 626C and 626D in the Florida Straits; Holes 627A and 627B, 628A, and 630A and 630C north of Little Bahama Bank; Holes 631 A, 632A and 632B, and 633A in Exuma Sound; and Holes 634A and 635A and 635B in Northeast Providence Channel. These data are compared with the mineralogy and strontium content of the sediments from which the waters were squeezed. Contrasts in the geochemical profiles suggest that significantly different processes govern pore-water signatures at each group of sites. In Little Bahama Bank, strong positive Ca2+ gradients are correlated with weak negative Mg2+ profiles. These trends are analogous to those seen at DSDP sites where carbonate deposits immediately overlie mafic basement, but as the depth to basement may be in excess of 5000 m, we suggest that diffusion gradients are initiated by an underlying sedimentary unit. In contrast, Ca2+ and Mg2+ gradients in Exuma Sound are not developed to any appreciable extent over similar thicknesses of sediment. We suggest that the pore-water chemistry in these deposits is principally controlled by diagenetic reactions occurring within each sequence. The location and extent of carbonate diagenesis can be estimated from dissolved Sr2+ profiles. In Little Bahama Bank and Exuma Sound, Sr2+ concentrations reach a maximum value of between 700 and 1000 µmol/L. Although the depths at which these concentrations are achieved are different for the two areas, the corresponding age of the sediment at the dissolved Sr2+ maximum is similar. Consequently, the diffusive flux of Sr2+ and the calculated rates of recrystallization in the two areas are likewise of a similar magnitude. The rates of recrystallization we calculate are lower than those found in some DSDP pelagic sites. As the waters throughout most of the holes are saturated with respect to SrSO4, celestite precipitation may cause erroneously low Sr2+ production rates ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-79.546760,-75.435500,27.635000,23.586700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
101-626C 101-626D 101-627A 101-627B 101-628A 101-630A 101-630B 101-630C 101-631A 101-632 101-632A 101-632B 101-633A 101-634A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg101 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
101-626C 101-626D 101-627A 101-627B 101-628A 101-630A 101-630B 101-630C 101-631A 101-632 101-632A 101-632B 101-633A 101-634A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg101 North Atlantic Ocean Ocean Drilling Program ODP Swart, Peter K Guzikowski, Michael Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
topic_facet |
101-626C 101-626D 101-627A 101-627B 101-628A 101-630A 101-630B 101-630C 101-631A 101-632 101-632A 101-632B 101-633A 101-634A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg101 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Concentrations of dissolved Ca2+, Sr2+, Mg2+, SO4[2-], and alkalinity were measured in pore waters squeezed from sediments taken from ODP Holes 626C and 626D in the Florida Straits; Holes 627A and 627B, 628A, and 630A and 630C north of Little Bahama Bank; Holes 631 A, 632A and 632B, and 633A in Exuma Sound; and Holes 634A and 635A and 635B in Northeast Providence Channel. These data are compared with the mineralogy and strontium content of the sediments from which the waters were squeezed. Contrasts in the geochemical profiles suggest that significantly different processes govern pore-water signatures at each group of sites. In Little Bahama Bank, strong positive Ca2+ gradients are correlated with weak negative Mg2+ profiles. These trends are analogous to those seen at DSDP sites where carbonate deposits immediately overlie mafic basement, but as the depth to basement may be in excess of 5000 m, we suggest that diffusion gradients are initiated by an underlying sedimentary unit. In contrast, Ca2+ and Mg2+ gradients in Exuma Sound are not developed to any appreciable extent over similar thicknesses of sediment. We suggest that the pore-water chemistry in these deposits is principally controlled by diagenetic reactions occurring within each sequence. The location and extent of carbonate diagenesis can be estimated from dissolved Sr2+ profiles. In Little Bahama Bank and Exuma Sound, Sr2+ concentrations reach a maximum value of between 700 and 1000 µmol/L. Although the depths at which these concentrations are achieved are different for the two areas, the corresponding age of the sediment at the dissolved Sr2+ maximum is similar. Consequently, the diffusive flux of Sr2+ and the calculated rates of recrystallization in the two areas are likewise of a similar magnitude. The rates of recrystallization we calculate are lower than those found in some DSDP pelagic sites. As the waters throughout most of the holes are saturated with respect to SrSO4, celestite precipitation may cause erroneously low Sr2+ production rates ... |
format |
Dataset |
author |
Swart, Peter K Guzikowski, Michael |
author_facet |
Swart, Peter K Guzikowski, Michael |
author_sort |
Swart, Peter K |
title |
Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
title_short |
Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
title_full |
Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
title_fullStr |
Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
title_full_unstemmed |
Mineralogy and interstitial-water chemistry of ODP Leg 101 sites |
title_sort |
mineralogy and interstitial-water chemistry of odp leg 101 sites |
publisher |
PANGAEA |
publishDate |
1988 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.742896 https://doi.org/10.1594/PANGAEA.742896 |
op_coverage |
MEDIAN LATITUDE: 25.423004 * MEDIAN LONGITUDE: -77.367868 * SOUTH-BOUND LATITUDE: 23.586700 * WEST-BOUND LONGITUDE: -79.546760 * NORTH-BOUND LATITUDE: 27.635000 * EAST-BOUND LONGITUDE: -75.435500 * DATE/TIME START: 1985-02-03T07:15:00 * DATE/TIME END: 1985-03-08T18:45:00 |
long_lat |
ENVELOPE(-79.546760,-75.435500,27.635000,23.586700) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Swart, Peter K; Guzikowski, Michael (1988): Interstitial-water chemistry and diagenesis of periplatform sediments from the Bahamas, ODP Leg 101. In: Austin, JA Jr.; Schlager, W; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 101, 363-380, https://doi.org/10.2973/odp.proc.sr.101.158.1988 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.742896 https://doi.org/10.1594/PANGAEA.742896 |
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.742896 https://doi.org/10.2973/odp.proc.sr.101.158.1988 |
_version_ |
1766136966438453248 |