Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites
Carbon and oxygen isotopic compositions of authigenic carbonate nodules or layers reflect the diagenetic conditions at the time of nodule growth. The shallowest samples of carbonate nodules and dissolved inorganic carbon of pore water samples beneath the sulfate reduction zone (0-160 meters below se...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.780617 2024-09-15T18:31:38+00:00 Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites Claypool, George E Lorenson, Thomas D Johnson, Craig A MEDIAN LATITUDE: -65.153422 * MEDIAN LONGITUDE: 68.984499 * SOUTH-BOUND LATITUDE: -67.696160 * WEST-BOUND LONGITUDE: 67.218060 * NORTH-BOUND LATITUDE: -64.379450 * EAST-BOUND LONGITUDE: 74.786930 * DATE/TIME START: 2000-01-28T00:00:00 * DATE/TIME END: 2000-02-21T16:00:00 2003 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.780617 https://doi.org/10.1594/PANGAEA.780617 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.780617 https://doi.org/10.1594/PANGAEA.780617 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Claypool, George E; Lorenson, Thomas D; Johnson, Craig A (2003): Authigenic carbonates, methane generation, and oxidation in continental rise and shelf sediments, ODP Leg 188 Sites 1165 and 1166, offshore Antarctica (Prydz Bay). In: Cooper, AK; O'Brien, PE; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 188, 1-15, https://doi.org/10.2973/odp.proc.sr.188.004.2003 188-1165 188-1165B 188-1165C 188-1166A COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg188 Ocean Drilling Program ODP Prydz Bay dataset publication series 2003 ftpangaea https://doi.org/10.1594/PANGAEA.78061710.2973/odp.proc.sr.188.004.2003 2024-07-24T02:31:21Z Carbon and oxygen isotopic compositions of authigenic carbonate nodules or layers reflect the diagenetic conditions at the time of nodule growth. The shallowest samples of carbonate nodules and dissolved inorganic carbon of pore water samples beneath the sulfate reduction zone (0-160 meters below seafloor [mbsf]) at Site 1165 have extremely negative d13C values (-50 per mil and -62 per mil, respectively). These negative d13C values indicate nodule formation in association with anaerobic methane oxidation coupled with sulfate reduction. The 34S of residual sulfate at Site 1165 shows only minor 34S enrichment (+6 per mil), even with complete sulfate reduction. This small degree of apparent 34S enrichment is due to extreme "open-system" sulfate reduction, with sulfate abundantly resupplied by diffusion from overlying seawater. Ten calcite nodules from Site 1165 contain minor quartz and feldspar and have d13C values ranging from -49.7 per mil to -8.2 per mil. The nodules with the most negative d13C values currently are at depths of 273 to 350 mbsf and must have precipitated from carbonate largely derived from subsurface anaerobic methane oxidation. The processes of sulfate reduction coupled with methane oxidation in sediments of Hole 1165B are indicated by characteristic concentration and isotopic (d34S and d13C) profiles of dissolved sulfate and bicarbonate. Three siderite nodules from Site 1166 contain feldspar and mica and one has significant carbonate-apatite. The siderite has d13C values ranging from -15.3 per mil to -7.6 per mil. These siderite nodules probably represent early diagenetic carbonate precipitation during microbial methanogenesis. Other/Unknown Material Prydz Bay PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(67.218060,74.786930,-64.379450,-67.696160) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
188-1165 188-1165B 188-1165C 188-1166A COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg188 Ocean Drilling Program ODP Prydz Bay |
spellingShingle |
188-1165 188-1165B 188-1165C 188-1166A COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg188 Ocean Drilling Program ODP Prydz Bay Claypool, George E Lorenson, Thomas D Johnson, Craig A Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
topic_facet |
188-1165 188-1165B 188-1165C 188-1166A COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg188 Ocean Drilling Program ODP Prydz Bay |
description |
Carbon and oxygen isotopic compositions of authigenic carbonate nodules or layers reflect the diagenetic conditions at the time of nodule growth. The shallowest samples of carbonate nodules and dissolved inorganic carbon of pore water samples beneath the sulfate reduction zone (0-160 meters below seafloor [mbsf]) at Site 1165 have extremely negative d13C values (-50 per mil and -62 per mil, respectively). These negative d13C values indicate nodule formation in association with anaerobic methane oxidation coupled with sulfate reduction. The 34S of residual sulfate at Site 1165 shows only minor 34S enrichment (+6 per mil), even with complete sulfate reduction. This small degree of apparent 34S enrichment is due to extreme "open-system" sulfate reduction, with sulfate abundantly resupplied by diffusion from overlying seawater. Ten calcite nodules from Site 1165 contain minor quartz and feldspar and have d13C values ranging from -49.7 per mil to -8.2 per mil. The nodules with the most negative d13C values currently are at depths of 273 to 350 mbsf and must have precipitated from carbonate largely derived from subsurface anaerobic methane oxidation. The processes of sulfate reduction coupled with methane oxidation in sediments of Hole 1165B are indicated by characteristic concentration and isotopic (d34S and d13C) profiles of dissolved sulfate and bicarbonate. Three siderite nodules from Site 1166 contain feldspar and mica and one has significant carbonate-apatite. The siderite has d13C values ranging from -15.3 per mil to -7.6 per mil. These siderite nodules probably represent early diagenetic carbonate precipitation during microbial methanogenesis. |
format |
Other/Unknown Material |
author |
Claypool, George E Lorenson, Thomas D Johnson, Craig A |
author_facet |
Claypool, George E Lorenson, Thomas D Johnson, Craig A |
author_sort |
Claypool, George E |
title |
Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
title_short |
Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
title_full |
Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
title_fullStr |
Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
title_full_unstemmed |
Sulphate and d34S in pore waters and δ¹³C, δ¹⁸O and mineral composition of carbonate nodules from ODP Leg 188 sites |
title_sort |
sulphate and d34s in pore waters and δ¹³c, δ¹⁸o and mineral composition of carbonate nodules from odp leg 188 sites |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.780617 https://doi.org/10.1594/PANGAEA.780617 |
op_coverage |
MEDIAN LATITUDE: -65.153422 * MEDIAN LONGITUDE: 68.984499 * SOUTH-BOUND LATITUDE: -67.696160 * WEST-BOUND LONGITUDE: 67.218060 * NORTH-BOUND LATITUDE: -64.379450 * EAST-BOUND LONGITUDE: 74.786930 * DATE/TIME START: 2000-01-28T00:00:00 * DATE/TIME END: 2000-02-21T16:00:00 |
long_lat |
ENVELOPE(67.218060,74.786930,-64.379450,-67.696160) |
genre |
Prydz Bay |
genre_facet |
Prydz Bay |
op_source |
Supplement to: Claypool, George E; Lorenson, Thomas D; Johnson, Craig A (2003): Authigenic carbonates, methane generation, and oxidation in continental rise and shelf sediments, ODP Leg 188 Sites 1165 and 1166, offshore Antarctica (Prydz Bay). In: Cooper, AK; O'Brien, PE; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 188, 1-15, https://doi.org/10.2973/odp.proc.sr.188.004.2003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.780617 https://doi.org/10.1594/PANGAEA.780617 |
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.78061710.2973/odp.proc.sr.188.004.2003 |
_version_ |
1810473379337076736 |