Ingram, B Lynn (1995): Strontium isotope ratios of fish teeth from ODP sites in the central North Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.712116, Supplement to: Ingram, BL (1995): High-resolution dating of deep-sea clays using Sr isotopes in fossil fish teeth. Earth and Planetary Science Letters, 134(3-4), 545-555, https://doi.org/10.1016/0012-821X(95)00151-2
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Strontium isotopic compositions of ichthyoliths (microscopic fish remains) in deep-sea clays recovered from the North Pacific Ocean (ODP holes 885A, 886B, and 886C) are used to provide stratigraphic age control within these otherwise undatable sediments. Age control within the deep-sea clays is crucial for determining changes in sedimentation rates, and for calculating fluxes of chemical and mineral components to the sediments.
The Sr isotopic ages are in excellent agreement with independent age datums from above (diatom ooze), below (basalt basement) and within (Cretaceous-Tertiary boundary) the clay deposit. The 87Sr/86Sr ratios of fish teeth from the top of the pelagic clay unit (0.7089891), indicate an Late Miocene age (5.8 Ma), as do radiolarian and diatom biostratigraphic ages in the overlying diatom ooze. The 87Sr/86Sr ratio (0.707887) is consistent with a Cretaceous-Tertiary boundary age, as identified by anomalously high iridium, shocked quartz, and sperules in Hole 886C. The 87Sr/86Sr ratios of pretreated fish teeth from the base of the clay unit are similar to Late Cretaceous seawater (0.707779-0.7075191), consistent with radiometric ages from the underlying basalt of 81 Ma. Calculation of sedimentation rates based on Sr isotopic ages from Hole 886C indicate an average sedimentation rate of 17.7 m/Myr in Unit II (diatom ooze), 0.55 m/Myr in Unit IIIa (pelagic clay), and 0.68 m/Myr in Unit IIIb (distal hydrothermal precipitates). The Sr isotopic ages indicate a period of greatly reduced sedimentation (or possible hiatus) between about 35 and 65 Ma (Eocene-Paleocene), with a linear sedimentation rate of only 0.04 m/Myr The calculated sedimentation rates are generally inversely proportional to cobalt accumulation rates and ichthyolith abundances. However, discrepancies between Sr isotope ages and cobalt accumulation ages of l0-15 Myr are evident, particularly in the middle of the clay unit IIIa (Oligocene-Paleocene).
Ingram, B Lynn (1995): Ichthyolith strontium isotopic stratigraphy of deep-sea clays: Sites 885 and 886 (North Pacific Transect). In: Rea, D.K., Basov, I.A., Scholl, D.W., Allan, J.F. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 145, 399-412, https://doi.org/10.2973/odp.proc.sr.145.130.1995
Median Latitude: 44.689016 * Median Longitude: -179.723022 * South-bound Latitude: 44.688300 * West-bound Longitude: 168.272000 * North-bound Latitude: 44.689700 * East-bound Longitude: -168.240000
Date/Time Start: 1992-04-09T18:15:00 * Date/Time End: 1992-09-05T06:15:00
145-885A * Latitude: 44.688300 * Longitude: 168.272000 * Date/Time Start: 1992-09-03T07:30:00 * Date/Time End: 1992-09-04T10:00:00 * Elevation: -5720.0 m * Penetration: 58.8 m * Recovery: 53.72 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 58.8 m cored; 0 m drilled; 91.4 % recovery
145-886B * Latitude: 44.689700 * Longitude: -168.240000 * Date/Time Start: 1992-04-09T18:15:00 * Date/Time End: 1992-09-05T06:15:00 * Elevation: -5726.0 m * Penetration: 68.9 m * Recovery: 60.5 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 68.9 m cored; 0 m drilled; 87.8 % recovery
145-886C * Latitude: 44.689700 * Longitude: -168.240000 * Date/Time Start: 1992-09-05T06:15:00 * Date/Time End: 1992-09-05T00:30:00 * Elevation: -5725.0 m * Penetration: 72.4 m * Recovery: 67.09 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 72.4 m cored; 0 m drilled; 92.7 % recovery