(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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Bibliographic Details
Main Authors: Ogawa, Yusuke, Takahashi, Kozo, Yamanaka, Toshiro
Format: Dataset
Language:English
Published: PANGAEA 2012
Subjects:
Event label
Sample code/label
DEPTH, sediment/rock
Opal, biogenic silica
Accumulation rate, opal
Carbon, organic, total
Sulfur, total
Nitrogen, total
δ34S
Carbon/Nitrogen ratio
DSDP/ODP/IODP sample designation
Opal, extraction; Mortlock & Froelich, 1989
Spectrophotometer Shimadzu UV mini-1240
Element analyser CHNS/O, Perkin-Elmer 2400 II
Mass spectrometer GV Instruments Isoprime
Exp302
CCGS Captain Molly Kool Vidar Viking
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Arctic
Arctic Ocean
Arctic Basin
Paleo-Arctic
Online Access:https://dx.doi.org/10.1594/pangaea.787402
https://doi.pangaea.de/10.1594/PANGAEA.787402
Description
Summary: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 ... : 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 ...

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