Interstitial-water chemistry and stable isotope record of Prydz Bay sediments
Leg 119 of the Ocean Drilling Program (ODP) provided the first opportunity to study the interstitial-water chemistry of the eastern Antarctic continental margin. Five sites were cored in a northwest-southeast transect of Prydz Bay that extended from the top of the continental slope to within 30 km o...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.758175 2024-09-15T17:43:25+00:00 Interstitial-water chemistry and stable isotope record of Prydz Bay sediments Chambers, Steven R MEDIAN LATITUDE: -67.860967 * MEDIAN LONGITUDE: 75.713213 * SOUTH-BOUND LATITUDE: -68.764000 * WEST-BOUND LONGITUDE: 74.690500 * NORTH-BOUND LATITUDE: -66.916000 * EAST-BOUND LONGITUDE: 76.681900 * DATE/TIME START: 1988-01-19T03:00:00 * DATE/TIME END: 1988-02-03T20:00:00 1991 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.758175 https://doi.org/10.1594/PANGAEA.758175 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.758175 https://doi.org/10.1594/PANGAEA.758175 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Chambers, Steven R (1991): Solute distributions and stable isotope chemistry of interstitial waters from Prydz Bay, Antarctica. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 375-392, https://doi.org/10.2973/odp.proc.sr.119.170.1991 119-739C 119-740A 119-740B 119-741A 119-742A 119-743A DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.75817510.2973/odp.proc.sr.119.170.1991 2024-07-24T02:31:20Z Leg 119 of the Ocean Drilling Program (ODP) provided the first opportunity to study the interstitial-water chemistry of the eastern Antarctic continental margin. Five sites were cored in a northwest-southeast transect of Prydz Bay that extended from the top of the continental slope to within 30 km of the coastline. Geological studies of the cores reveal a continental margin that has evolved through terrestrial, glacial, and glacial-marine environments. Chemical and stable isotopic analyses of the interstitial-waters were performed to determine the types of depositional environments and the diagenetic and hydrologic processes that are operating in this unusual marine environment. Highly compacted glacial sediments provide an effective barrier to the vertical diffusion of interstitial-water solutes. Meteoric water from the Antarctic continent appears to be flowing into Prydz Bay sediments through the sequence of terrestrial sediments that lie underneath the glacial sediments. The large amounts of erosion associated with glacial advances appear to have had the effect of limiting the amount of marine organic matter that is incorporated into the sediments on the continental shelf. Although all of the sites cored in Prydz Bay exhibit depletions in dissolved sulfate with increasing depth, the greatest bacterial activity is associated with a thin layer of diatom ooze that coats the seafloor of the inner bay. Results of alkalinity modeling, thermodynamic calculations, and strontium analyses indicate that (1) ocean bottom waters seaward of Site 740 are undersaturated with respect to both calcite and aragonite, (2) interstitial waters at each site become saturated or supersaturated with respect to calcite and aragonite with increasing depth, (3) precipitation of calcium carbonate reduces the alkalinity of the pore waters with increasing depth, and (4) recrystallization of aragonite to calcite accounts for 24% of the pore-water strontium. Weathering of unstable terrestrial debris and cation exchange between clay minerals ... Other/Unknown Material Antarc* Antarctic Prydz Bay PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(74.690500,76.681900,-66.916000,-68.764000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
119-739C 119-740A 119-740B 119-741A 119-742A 119-743A DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
spellingShingle |
119-739C 119-740A 119-740B 119-741A 119-742A 119-743A DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay Chambers, Steven R Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
topic_facet |
119-739C 119-740A 119-740B 119-741A 119-742A 119-743A DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
description |
Leg 119 of the Ocean Drilling Program (ODP) provided the first opportunity to study the interstitial-water chemistry of the eastern Antarctic continental margin. Five sites were cored in a northwest-southeast transect of Prydz Bay that extended from the top of the continental slope to within 30 km of the coastline. Geological studies of the cores reveal a continental margin that has evolved through terrestrial, glacial, and glacial-marine environments. Chemical and stable isotopic analyses of the interstitial-waters were performed to determine the types of depositional environments and the diagenetic and hydrologic processes that are operating in this unusual marine environment. Highly compacted glacial sediments provide an effective barrier to the vertical diffusion of interstitial-water solutes. Meteoric water from the Antarctic continent appears to be flowing into Prydz Bay sediments through the sequence of terrestrial sediments that lie underneath the glacial sediments. The large amounts of erosion associated with glacial advances appear to have had the effect of limiting the amount of marine organic matter that is incorporated into the sediments on the continental shelf. Although all of the sites cored in Prydz Bay exhibit depletions in dissolved sulfate with increasing depth, the greatest bacterial activity is associated with a thin layer of diatom ooze that coats the seafloor of the inner bay. Results of alkalinity modeling, thermodynamic calculations, and strontium analyses indicate that (1) ocean bottom waters seaward of Site 740 are undersaturated with respect to both calcite and aragonite, (2) interstitial waters at each site become saturated or supersaturated with respect to calcite and aragonite with increasing depth, (3) precipitation of calcium carbonate reduces the alkalinity of the pore waters with increasing depth, and (4) recrystallization of aragonite to calcite accounts for 24% of the pore-water strontium. Weathering of unstable terrestrial debris and cation exchange between clay minerals ... |
format |
Other/Unknown Material |
author |
Chambers, Steven R |
author_facet |
Chambers, Steven R |
author_sort |
Chambers, Steven R |
title |
Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
title_short |
Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
title_full |
Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
title_fullStr |
Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
title_full_unstemmed |
Interstitial-water chemistry and stable isotope record of Prydz Bay sediments |
title_sort |
interstitial-water chemistry and stable isotope record of prydz bay sediments |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.758175 https://doi.org/10.1594/PANGAEA.758175 |
op_coverage |
MEDIAN LATITUDE: -67.860967 * MEDIAN LONGITUDE: 75.713213 * SOUTH-BOUND LATITUDE: -68.764000 * WEST-BOUND LONGITUDE: 74.690500 * NORTH-BOUND LATITUDE: -66.916000 * EAST-BOUND LONGITUDE: 76.681900 * DATE/TIME START: 1988-01-19T03:00:00 * DATE/TIME END: 1988-02-03T20:00:00 |
long_lat |
ENVELOPE(74.690500,76.681900,-66.916000,-68.764000) |
genre |
Antarc* Antarctic Prydz Bay |
genre_facet |
Antarc* Antarctic Prydz Bay |
op_source |
Supplement to: Chambers, Steven R (1991): Solute distributions and stable isotope chemistry of interstitial waters from Prydz Bay, Antarctica. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 375-392, https://doi.org/10.2973/odp.proc.sr.119.170.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.758175 https://doi.org/10.1594/PANGAEA.758175 |
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.75817510.2973/odp.proc.sr.119.170.1991 |
_version_ |
1810490396190441472 |