Hancock, Haidi JL; Dickens, Gerald Roy (2005): Foraminifer, coarse fraction and carbonate characteristics of sediments from ODP Leg 198 sites on Shatsky Rise [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.777755, Supplement to: Hancock, HJL; Dickens, GR (2005): Carbonate dissolution episodes in Paleocene and Eocene sediment, Shatsky Rise, west-central Pacific. In: Bralower, TJ; Premoli Silva, I; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 198, 1-24, https://doi.org/10.2973/odp.proc.sr.198.116.2005
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Abstract:
Holes 1209A and 1211A on Southern High, Shatsky Rise contain expanded, nearly continuous records of carbonate-rich sediment deposited in deep water of the equatorial Pacific Ocean during the Paleocene and Eocene. In this study, we document intervals of carbonate dissolution in these records by examining temporal changes in four parameters: carbonate content, coarse size fraction (>38 µm), benthic foraminiferal abundance, and planktonic foraminiferal fragmentation ratio. Carbonate content is not a sensitive indicator of carbonate dissolution in the studied sections, although rare intervals of low carbonate may reflect times of relatively high dissolution. The proportion of coarse size fraction does not accurately record carbonate dissolution either because the relative abundance of nannofossils largely determines the grain-size distribution. Benthic abundance and fragmentation covary (r**2 = 0.77) and are probably the best indicators for carbonate dissolution. For both holes, records of these parameters indicate two episodes of prominent dissolution. The first of these occurs in the upper Paleocene (~59-58 Ma) and the second in the middle to upper Eocene (~45-33.7 Ma). Other intervals of enhanced carbonate dissolution are located in the upper Paleocene (~56 Ma) and in the upper lower Eocene (~51 Ma). Enhanced preservation of planktonic foraminiferal assemblages marks the start of both the Paleocene and Eocene epochs.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.326910 * Median Longitude: 158.177955 * South-bound Latitude: 32.002160 * West-bound Longitude: 157.849980 * North-bound Latitude: 32.651660 * East-bound Longitude: 158.505930
Date/Time Start: 2001-09-18T08:00:00 * Date/Time End: 2001-09-28T06:10:00
Event(s):
198-1209A * Latitude: 32.651660 * Longitude: 158.505930 * Date/Time Start: 2001-09-18T08:00:00 * Date/Time End: 2001-09-19T13:35:00 * Elevation: -2387.2 m * Penetration: 259.6 m * Recovery: 262.27 m * Location: North Pacific Ocean * Campaign: Leg198 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 259.6 m cored; 0 m drilled; 101 % recovery
198-1211A * Latitude: 32.002160 * Longitude: 157.849980 * Date/Time Start: 2001-09-27T02:25:00 * Date/Time End: 2001-09-28T06:10:00 * Elevation: -2907.5 m * Penetration: 158.9 m * Recovery: 162.72 m * Location: North Pacific Ocean * Campaign: Leg198 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 158.9 m cored; 0 m drilled; 102.4 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Hancock, HJL; Dickens, GR (2005): (Table T1) Foraminifer, coarse fraction and carbonate characteristics of ODP Hole 198-1209A sediments. https://doi.org/10.1594/PANGAEA.777753
- Hancock, HJL; Dickens, GR (2005): (Table T2) Foraminifer, coarse fraction and carbonate characteristics of ODP Hole 198-1211A sediments. https://doi.org/10.1594/PANGAEA.777754