(Table 2) Geochemical analysis from IODP Exp302
Geochemical analyses of biogenic opal, total organic carbon (TOC), total sulfur (TS), and stable sulfur isotopic composition were conducted on the middle Eocene section of the ACEX cores obtained by IODP Expedition 302. The analyzed %TS contents were high in all the examined intervals, indicating su...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.787402 2023-05-15T14:25:46+02:00 (Table 2) Geochemical analysis from IODP Exp302 Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro 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 m * MAXIMUM DEPTH, sediment/rock: 372 m 2012-08-20 text/tab-separated-values, 1738 data points https://doi.pangaea.de/10.1594/PANGAEA.787402 https://doi.org/10.1594/PANGAEA.787402 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.787402 https://doi.org/10.1594/PANGAEA.787402 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Ogawa, Yusuke; Takahashi, Kozo; Yamanaka, Toshiro (2008): Paleoceanography of the middle Eocene Arctic Ocean based on geochemical measurements of biogenic matter. Memoirs of the Faculty of Science Kyushu University Series D Earth and Planetary Sciences, 32(1), 31-48 302-M0002A 302-M0004A Accumulation rate opal ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Carbon organic total Carbon/Nitrogen ratio DEPTH sediment/rock DSDP/ODP/IODP sample designation Element analyser CHNS/O Perkin-Elmer 2400 II Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Mass spectrometer GV Instruments Isoprime Nitrogen biogenic silica extraction Mortlock & Froelich 1989 Sample code/label Spectrophotometer Shimadzu UV mini-1240 Sulfur Vidar Viking δ34S Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.787402 2023-01-20T08:55:09Z Geochemical analyses of biogenic opal, total organic carbon (TOC), total sulfur (TS), and stable sulfur isotopic composition were conducted on the middle Eocene section of the ACEX cores obtained by IODP Expedition 302. The analyzed %TS contents were high in all the examined intervals, indicating sufficient sea water was present in the deep layer of the paleo Arctic basin in contrast with the low salinity surface waters determined by freshwater siliceous microfossils. From the high %TS in Lithological Unit 1/6, the extent of sea water supply from outside of the Arctic basin appeared to have increased after 45 Ma. The euxinic condition of the bottom water is suggested by the TOC-TS diagram. The anoxic environment was brought about by the estuarine type circulation pattern and salinity stratification. The light sulfur isotope composition (d34S) indicates the microbial sulfate reduction in an open system. The trend of d34S shift toward lower values with time is an indication of the history that the water exchange between the Arctic Ocean and the outside basin became progressively extensive. The high %TS, the plotted pattern of TOC vs TS, and the extremely low sulfur isotopic values are unique and not comparable with the modern analogous such as the Black Sea. These results illustrate that the middle Eocene Arctic Ocean retained characteristically unique environments on the geochemical aspect. Dataset Arctic Arctic Basin Arctic Arctic Ocean Paleo-Arctic PANGAEA - Data Publisher for Earth & Environmental Science Arctic Arctic Ocean 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 opal ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Carbon organic total Carbon/Nitrogen ratio DEPTH sediment/rock DSDP/ODP/IODP sample designation Element analyser CHNS/O Perkin-Elmer 2400 II Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Mass spectrometer GV Instruments Isoprime Nitrogen biogenic silica extraction Mortlock & Froelich 1989 Sample code/label Spectrophotometer Shimadzu UV mini-1240 Sulfur Vidar Viking δ34S |
spellingShingle |
302-M0002A 302-M0004A Accumulation rate opal ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Carbon organic total Carbon/Nitrogen ratio DEPTH sediment/rock DSDP/ODP/IODP sample designation Element analyser CHNS/O Perkin-Elmer 2400 II Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Mass spectrometer GV Instruments Isoprime Nitrogen biogenic silica extraction Mortlock & Froelich 1989 Sample code/label Spectrophotometer Shimadzu UV mini-1240 Sulfur Vidar Viking δ34S Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro (Table 2) Geochemical analysis from IODP Exp302 |
topic_facet |
302-M0002A 302-M0004A Accumulation rate opal ACEX-M2A ACEX-M4A Arctic Coring Expedition ACEX Arctic Ocean Carbon organic total Carbon/Nitrogen ratio DEPTH sediment/rock DSDP/ODP/IODP sample designation Element analyser CHNS/O Perkin-Elmer 2400 II Event label Exp302 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Mass spectrometer GV Instruments Isoprime Nitrogen biogenic silica extraction Mortlock & Froelich 1989 Sample code/label Spectrophotometer Shimadzu UV mini-1240 Sulfur Vidar Viking δ34S |
description |
Geochemical analyses of biogenic opal, total organic carbon (TOC), total sulfur (TS), and stable sulfur isotopic composition were conducted on the middle Eocene section of the ACEX cores obtained by IODP Expedition 302. The analyzed %TS contents were high in all the examined intervals, indicating sufficient sea water was present in the deep layer of the paleo Arctic basin in contrast with the low salinity surface waters determined by freshwater siliceous microfossils. From the high %TS in Lithological Unit 1/6, the extent of sea water supply from outside of the Arctic basin appeared to have increased after 45 Ma. The euxinic condition of the bottom water is suggested by the TOC-TS diagram. The anoxic environment was brought about by the estuarine type circulation pattern and salinity stratification. The light sulfur isotope composition (d34S) indicates the microbial sulfate reduction in an open system. The trend of d34S shift toward lower values with time is an indication of the history that the water exchange between the Arctic Ocean and the outside basin became progressively extensive. The high %TS, the plotted pattern of TOC vs TS, and the extremely low sulfur isotopic values are unique and not comparable with the modern analogous such as the Black Sea. These results illustrate that the middle Eocene Arctic Ocean retained characteristically unique environments on the geochemical aspect. |
format |
Dataset |
author |
Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro |
author_facet |
Ogawa, Yusuke Takahashi, Kozo Yamanaka, Toshiro |
author_sort |
Ogawa, Yusuke |
title |
(Table 2) Geochemical analysis from IODP Exp302 |
title_short |
(Table 2) Geochemical analysis from IODP Exp302 |
title_full |
(Table 2) Geochemical analysis from IODP Exp302 |
title_fullStr |
(Table 2) Geochemical analysis from IODP Exp302 |
title_full_unstemmed |
(Table 2) Geochemical analysis from IODP Exp302 |
title_sort |
(table 2) geochemical analysis from iodp exp302 |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.787402 https://doi.org/10.1594/PANGAEA.787402 |
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 m * MAXIMUM DEPTH, sediment/rock: 372 m |
long_lat |
ENVELOPE(136.177350,139.365010,87.921180,87.866580) |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Basin Arctic Arctic Ocean Paleo-Arctic |
genre_facet |
Arctic Arctic Basin Arctic Arctic Ocean Paleo-Arctic |
op_source |
Supplement to: Ogawa, Yusuke; Takahashi, Kozo; Yamanaka, Toshiro (2008): Paleoceanography of the middle Eocene Arctic Ocean based on geochemical measurements of biogenic matter. Memoirs of the Faculty of Science Kyushu University Series D Earth and Planetary Sciences, 32(1), 31-48 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.787402 https://doi.org/10.1594/PANGAEA.787402 |
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.787402 |
_version_ |
1766298227192102912 |