Sato, Shunji (1980): Diagenetic alteration of organic matter in DSDP Leg 57 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.823098, Supplement to: Sato, S (1980): Diagenetic alteration of organic matter in Leg 57 sediments, Deep Sea Drilling Project. In: Scientific Party, Initial Reports of the Deep Sea Drilling Project, 56/57 (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 56-57, 1305-1312, https://doi.org/10.2973/dsdp.proc.5657.163.1980
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Abstract:
I analyzed Leg 57 sediments organogeochemically and spectroscopically. Organic carbon and extractable organic matter prevail from the Pliocene to the Miocene. Humic acids occur widely from the Pleistocene to the lower Miocene and one portion of the Oligocene. The absence of humic acids in Oligocene and Cretaceous samples suggests that humic acids had changed to kerogen. Visible spectroscopic data reveal that humic acids in this study have a low degree of condensed aromatic-ring system, which is a feature of anaerobic conditions during deposition, and that chlorophyll derivatives that had at first combined with humic acids moved to the solvent- soluble fraction during diagenesis. The elemental compositions of humic acids show high H/C and O/C ratios, which seem appropriate to a stage before transformation to kerogen. The relation between the linewidths and g-values on the electron spin resonance data indicates that the free radicals in humic acids are quite different from those in kerogen. The low spin concentrations of kerogen and the yields of humic acids up to the lower Miocene demonstrate that organic matter in these sediments is immature. The foregoing indicate the necessity to isolate humic acids even in ancient rocks in the study of kerogen.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 40.188481 * Median Longitude: 143.579469 * South-bound Latitude: 39.735500 * West-bound Longitude: 143.231700 * North-bound Latitude: 40.629800 * East-bound Longitude: 143.929000
Date/Time Start: 1977-10-19T00:00:00 * Date/Time End: 1977-11-10T00:00:00
Event(s):
57-438 * Latitude: 40.629200 * Longitude: 143.231700 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1552.0 m * Penetration: 109.5 m * Recovery: 82.1 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 90.5 m cored; 19 m drilled; 90.7 % recovery
57-438A * Latitude: 40.629800 * Longitude: 143.235800 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1558.0 m * Penetration: 878 m * Recovery: 535.5 m * Location: North Pacific/BASIN * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 83 cores; 780.5 m cored; 0 m drilled; 68.6 % recovery
57-439 * Latitude: 40.626800 * Longitude: 143.310500 * Date/Time: 1977-11-03T00:00:00 * Elevation: -1656.0 m * Penetration: 1157.5 m * Recovery: 160 m * Location: North Pacific/TRENCH * Campaign: Leg57 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 333.5 m cored; 0 m drilled; 48 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Sato, S (1980): (Table 2) Visible spectroscopy and elemental analyses of humic acids at DSDP Leg 57 Holes. https://doi.org/10.1594/PANGAEA.823096
- Sato, S (1980): (Table 1) Organic carbon, extractable organic matter, and humic acid content in sediments at DSDP Leg 57 Holes. https://doi.org/10.1594/PANGAEA.823095
- Sato, S (1980): (Table 3) ESR of kerogen and humic acids at DSDP Leg 57 Holes. https://doi.org/10.1594/PANGAEA.823097