(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A
Integrated Ocean Drilling Program (IODP) Expedition 302 Arctic Coring Expedition (ACEX) obtained the first relatively continuous long sediment cores from the Lomonosov Ridge in the central Arctic Ocean in 2004. Preceding microfossil studies indicated the dominance of low salinity surface waters in t...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2009
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.785796 https://doi.org/10.1594/PANGAEA.785796 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.785796 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.785796 2024-09-15T17:50:13+00:00 (Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro Onodera, Jonaotaro MEDIAN LATITUDE: 87.893880 * MEDIAN LONGITUDE: 137.771180 * SOUTH-BOUND LATITUDE: 87.866580 * WEST-BOUND LONGITUDE: 136.177350 * NORTH-BOUND LATITUDE: 87.921180 * EAST-BOUND LONGITUDE: 139.365010 * DATE/TIME START: 2004-08-19T00:00:00 * DATE/TIME END: 2004-08-27T00:00:00 * MINIMUM DEPTH, sediment/rock: 197.14 m * MAXIMUM DEPTH, sediment/rock: 372.05 m 2009 text/tab-separated-values, 909 data points https://doi.pangaea.de/10.1594/PANGAEA.785796 https://doi.org/10.1594/PANGAEA.785796 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.785796 https://doi.org/10.1594/PANGAEA.785796 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Ogawa, Yusuke; Takahashi, Kozo; Yamanaka, Toshiro; Onodera, Jonaotaro (2009): Significance of euxinic condition in the middle Eocene paleo-Arctic basin: A geochemical study on the IODP Arctic Coring Expedition 302 sediments. Earth and Planetary Science Letters, 285(1-2), 190-197, https://doi.org/10.1016/j.epsl.2009.06.011 302-M0002A 302-M0004A Accumulation rate sulfur total organic carbon ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Calculated Carbon organic total CCGS Captain Molly Kool (Vidar Viking) Depth composite sediment/rock DSDP/ODP/IODP sample designation Element analyser CHN Perkin-Elmer (Van Iperen & Helder 1985) Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program Intercore correlation IODP Mass spectrometry Sample code/label δ34S dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.78579610.1016/j.epsl.2009.06.011 2024-07-24T02:31:31Z Integrated Ocean Drilling Program (IODP) Expedition 302 Arctic Coring Expedition (ACEX) obtained the first relatively continuous long sediment cores from the Lomonosov Ridge in the central Arctic Ocean in 2004. Preceding microfossil studies indicated the dominance of low salinity surface waters in the early to middle Eocene Arctic basin. The main purpose of this study is to reconstruct paleoceanographic conditions including the extent of saline (seawater) mass presence. To attain this goal we performed geochemical analyses of total sulfur (%TS), total organic carbon (%TOC) and stable sulfur isotopic composition (d34S) on the early to middle Eocene section of the ACEX cores. The %TS were high in all the examined intervals and the sedimentary sulfur occurred mainly as framboidal pyrite, indicating that sufficient sulfate, indicative of seawater, was present in the deep layer of the paleo-Arctic basin and that the pyrite was formed in the sediments under sufficient iron input. The high %TS values with low d34S values also indicate the continuous existence and supply of seawater. The high accumulation of sulfide in Unit 1/6 was due to a significant increase of TOC supply which increased sulfate reduction rates by bacteria. The %TOC-%TS diagram shows excess sulfur content relative to the TOC, suggesting euxinic condition of the bottom water during the studied period. Such an oxygen depleted environment was brought about by salinity stratification and restricted water circulation. The patterns observed in the ACEX data can be comparable with the Mediterranean sapropels. The global d34S of seawater sulfate abruptly increased from + 17 to + 22 per mil in the early to middle Eocene. Previous studies suggested that enhanced pyrite burial caused the isotopic shift during this period. The large pyrite burial in the anoxic Arctic basin could have contributed to the remarkable isotopic event accounting for about 3 per mil of the global increase during this period. Dataset Arctic Arctic Basin Arctic Ocean Lomonosov Ridge Paleo-Arctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(136.177350,139.365010,87.921180,87.866580) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
302-M0002A 302-M0004A Accumulation rate sulfur total organic carbon ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Calculated Carbon organic total CCGS Captain Molly Kool (Vidar Viking) Depth composite sediment/rock DSDP/ODP/IODP sample designation Element analyser CHN Perkin-Elmer (Van Iperen & Helder 1985) Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program Intercore correlation IODP Mass spectrometry Sample code/label δ34S |
spellingShingle |
302-M0002A 302-M0004A Accumulation rate sulfur total organic carbon ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Calculated Carbon organic total CCGS Captain Molly Kool (Vidar Viking) Depth composite sediment/rock DSDP/ODP/IODP sample designation Element analyser CHN Perkin-Elmer (Van Iperen & Helder 1985) Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program Intercore correlation IODP Mass spectrometry Sample code/label δ34S Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro Onodera, Jonaotaro (Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
topic_facet |
302-M0002A 302-M0004A Accumulation rate sulfur total organic carbon ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Calculated Carbon organic total CCGS Captain Molly Kool (Vidar Viking) Depth composite sediment/rock DSDP/ODP/IODP sample designation Element analyser CHN Perkin-Elmer (Van Iperen & Helder 1985) Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program Intercore correlation IODP Mass spectrometry Sample code/label δ34S |
description |
Integrated Ocean Drilling Program (IODP) Expedition 302 Arctic Coring Expedition (ACEX) obtained the first relatively continuous long sediment cores from the Lomonosov Ridge in the central Arctic Ocean in 2004. Preceding microfossil studies indicated the dominance of low salinity surface waters in the early to middle Eocene Arctic basin. The main purpose of this study is to reconstruct paleoceanographic conditions including the extent of saline (seawater) mass presence. To attain this goal we performed geochemical analyses of total sulfur (%TS), total organic carbon (%TOC) and stable sulfur isotopic composition (d34S) on the early to middle Eocene section of the ACEX cores. The %TS were high in all the examined intervals and the sedimentary sulfur occurred mainly as framboidal pyrite, indicating that sufficient sulfate, indicative of seawater, was present in the deep layer of the paleo-Arctic basin and that the pyrite was formed in the sediments under sufficient iron input. The high %TS values with low d34S values also indicate the continuous existence and supply of seawater. The high accumulation of sulfide in Unit 1/6 was due to a significant increase of TOC supply which increased sulfate reduction rates by bacteria. The %TOC-%TS diagram shows excess sulfur content relative to the TOC, suggesting euxinic condition of the bottom water during the studied period. Such an oxygen depleted environment was brought about by salinity stratification and restricted water circulation. The patterns observed in the ACEX data can be comparable with the Mediterranean sapropels. The global d34S of seawater sulfate abruptly increased from + 17 to + 22 per mil in the early to middle Eocene. Previous studies suggested that enhanced pyrite burial caused the isotopic shift during this period. The large pyrite burial in the anoxic Arctic basin could have contributed to the remarkable isotopic event accounting for about 3 per mil of the global increase during this period. |
format |
Dataset |
author |
Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro Onodera, Jonaotaro |
author_facet |
Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro Onodera, Jonaotaro |
author_sort |
Ogawa, Yusuke |
title |
(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
title_short |
(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
title_full |
(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
title_fullStr |
(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
title_full_unstemmed |
(Appendix A) Geochemistry for Units 1/6, 2, and the upper part of Unit 3 of IODP Holes 302-M0002A and 302-M0004A |
title_sort |
(appendix a) geochemistry for units 1/6, 2, and the upper part of unit 3 of iodp holes 302-m0002a and 302-m0004a |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.785796 https://doi.org/10.1594/PANGAEA.785796 |
op_coverage |
MEDIAN LATITUDE: 87.893880 * MEDIAN LONGITUDE: 137.771180 * SOUTH-BOUND LATITUDE: 87.866580 * WEST-BOUND LONGITUDE: 136.177350 * NORTH-BOUND LATITUDE: 87.921180 * EAST-BOUND LONGITUDE: 139.365010 * DATE/TIME START: 2004-08-19T00:00:00 * DATE/TIME END: 2004-08-27T00:00:00 * MINIMUM DEPTH, sediment/rock: 197.14 m * MAXIMUM DEPTH, sediment/rock: 372.05 m |
long_lat |
ENVELOPE(136.177350,139.365010,87.921180,87.866580) |
genre |
Arctic Arctic Basin Arctic Ocean Lomonosov Ridge Paleo-Arctic |
genre_facet |
Arctic Arctic Basin Arctic Ocean Lomonosov Ridge Paleo-Arctic |
op_source |
Supplement to: Ogawa, Yusuke; Takahashi, Kozo; Yamanaka, Toshiro; Onodera, Jonaotaro (2009): Significance of euxinic condition in the middle Eocene paleo-Arctic basin: A geochemical study on the IODP Arctic Coring Expedition 302 sediments. Earth and Planetary Science Letters, 285(1-2), 190-197, https://doi.org/10.1016/j.epsl.2009.06.011 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.785796 https://doi.org/10.1594/PANGAEA.785796 |
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.78579610.1016/j.epsl.2009.06.011 |
_version_ |
1810292052736344064 |