Unknown
PANGAEA
In:
Supplement to: Sturz, Anne Aleda; Hanan, Barry B; Emanuele, Guy (1992): Geochemistry of sediments and interstitial waters from Oki Ridge and Kita-Yamato Trough, Japan Sea. In: Pisciotto, KA; Ingle, JCJr.; von Breymann, MT; Barron, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(1), 605-621, https://doi.org/10.2973/odp.proc.sr.127128-1.161.1992
Publication Date:
2024-04-06
Description:
Interstitial waters in sediments below 400 (Site 798) and 435 meters below seafloor (Site 799) have chloride concentrations of 516-527 and 501-515 mM, respectively, lower than the 540 mM of the modern-day Japan Sea. The chemical composition of interstitial waters, bulk sediments, clay-size sediment fraction, and carbonate nodules from Oki Ridge (Site 798) and Kita-Yamato Trough (Site 799), Japan Sea, reflect in-situ diagenetic processes superimposed on geochemical signals that may indicate freshening of Miocene local marginal basin waters. Interstitial waters at both sites exhibit changes in chemical composition which coincide with the occurrence of low-porosity and high-bulk density layers composed of dolomite and opal-CT, which impede diffusive communication with the overlying interstitial waters. Based on interstitial water stable isotope evidence and mass-balance calculations of chloride dilution, diagenetic reactions that involve the release of structural bound water from opal-A and/or clay minerals contribute to the observed geochemical signals, but cannot account for all the measured chloride dilution.
Keywords:
128-798A; 128-798B; 128-798C; 128-799A; 128-799B; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP
Type:
Dataset
Format:
application/zip, 6 datasets
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