Shemesh, Aldo; Mortlock, Richard A; Smith, R J; Froelich, Philip N (1988): Ge/Si ratios in marine siliceous microfossils [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.756978, Supplement to: Shemesh, A et al. (1988): Determination of Ge/Si in marine siliceous microfossils: separation, cleaning and dissolution of diatoms and radiolaria. Marine Chemistry, 25(4), 305-323, https://doi.org/10.1016/0304-4203(88)90113-2
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Abstract:
A procedure is presented to separate diatoms and radiolaria from marine sediments and from each other, to purify them of elements associated with other phases, and to dissolve them to determine their elemental composition. The cleaning procedure eliminates artifacts due to the presence of detrital clays and the high sorption capacity of hydrated silica. The concentration of trace elements (Al, Fe, Mg, and Ba) that we find in alkaline dissolutions of clean diatoms are at least an order of magnitude lower than previously reported. The overall long-term precision in the determination of Ge/Si in a sub-standard of clean diatoms is ±0.024 * 10**-6 (1 sigma).
Ge/Si measured in diatoms and radiolaria from core tops indicates that high-latitude Holocene diatoms accurately record the present-day oceanic Ge/Si, while radiolarian ratios are systematically lower and display more scatter. Evaluation of Ge/Si in diatoms and radiolaria from Hole DSDP 265 (Plio-Pleistocene) suggests that post-depositional alteration of the ratio does not occur at this site, but the average ratio carried by diatoms over this time interval was lower than that in the present ocean.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -46.505504 * Median Longitude: 154.503432 * South-bound Latitude: -63.083000 * West-bound Longitude: 37.904140 * North-bound Latitude: 55.083000 * East-bound Longitude: -0.355000
Date/Time Start: 1965-01-01T00:00:00 * Date/Time End: 1972-12-29T00:00:00
Event(s):
28-265 * Latitude: -53.540800 * Longitude: 109.945700 * Date/Time: 1972-12-29T00:00:00 * Elevation: -3581.0 m * Penetration: 462 m * Recovery: 107.9 m * Location: Antarctic Ocean/RIDGE * Campaign: Leg28 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 159.5 m cored; 9.5 m drilled; 67.6 % recovery
ELT17.009-PC * Latitude: -63.083000 * Longitude: -135.117000 * Date/Time: 1965-01-01T00:00:00 * Elevation: -4935.0 m * Recovery: 20.18 m * Campaign: ELT17 * Basis: Eltanin * Method/Device: Piston corer (PC)
ELT49.007-PC * Latitude: -53.037000 * Longitude: 110.047000 * Date/Time: 1971-01-01T00:00:00 * Elevation: -3631.0 m * Recovery: 11.94 m * Campaign: ELT49 * Basis: Eltanin * Method/Device: Piston corer (PC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Shemesh, A; Mortlock, RA; Smith, RJ et al. (1988): (Table 5) Ge/Si ratios in diatoms and radiolaria from DSDP Hole 28-265. https://doi.org/10.1594/PANGAEA.756977
- Shemesh, A; Mortlock, RA; Smith, RJ et al. (1988): (Table 1) Ge/Si ratios of diatoms and radiolarians fom high-latitude Holocene core top sediments. https://doi.org/10.1594/PANGAEA.756958
- Shemesh, A; Mortlock, RA; Smith, RJ et al. (1988): (Table 4A) Trace element concentrations in high-latitude diatoms. https://doi.org/10.1594/PANGAEA.756964