Ogawa, Yusuke; Takahashi, Kozo; Yamanaka, Toshiro (2012): (Table 2) Geochemical analysis from IODP Exp302 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.787402, Supplement to: Ogawa, Y et al. (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
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Abstract:
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.
Project(s):
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
Event(s):
302-M0002A (ACEX-M2A) * Latitude: 87.921180 * Longitude: 139.365010 * Date/Time: 2004-08-19T00:00:00 * Elevation: -1209.0 m * IGSN: IBCR0302RHTS001 * Penetration: 270.1 m * Recovery: 214.68 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking)
302-M0004A (ACEX-M4A) * Latitude: 87.866580 * Longitude: 136.177350 * Date/Time: 2004-08-27T00:00:00 * Elevation: -1287.9 m * IGSN: IBCR0302RHVS001 * Penetration: 427.9 m * Recovery: 85.91 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Ogawa, Yusuke | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 4 | Opal, biogenic silica | bSiO2 | % | Ogawa, Yusuke | Opal, extraction; Mortlock & Froelich, 1989 | |
| 5 | Accumulation rate, opal | Acc rate opal | g/cm2/ka | Ogawa, Yusuke | Spectrophotometer Shimadzu UV mini-1240 | |
| 6 | Carbon, organic, total | TOC | % | Ogawa, Yusuke | Element analyser CHNS/O, Perkin-Elmer 2400 II | |
| 7 | Sulfur, total | TS | % | Ogawa, Yusuke | Element analyser CHNS/O, Perkin-Elmer 2400 II | |
| 8 | Nitrogen, total | TN | % | Ogawa, Yusuke | Element analyser CHNS/O, Perkin-Elmer 2400 II | |
| 9 | δ34S | δ34S | ‰ CDT | Ogawa, Yusuke | Mass spectrometer GV Instruments Isoprime | |
| 10 | Carbon/Nitrogen ratio | C/N | Ogawa, Yusuke |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1738 data points