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Delaney, Margaret Lois; Boyle, Edward A (1986): Geochemistry of planktonic foraminifera from DSDP sites in the Atlantic and Pacific Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.715079, Supplement to: Delaney, ML; Boyle, EA (1986): Lithium in foraminiferal shells: implications for high-temperature hydrothermal circulation fluxes and oceanic crustal generation rates. Earth and Planetary Science Letters, 80(1-2), 91-105, https://doi.org/10.1016/0012-821X(86)90022-1

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Abstract:
The lithium content of planktonic foraminiferal calcite has been determined to evaluate temporal variability of seawater Li concentrations over the past 116 m.y. Mean foraminiferal calcite lithium/calcium in each time interval is no more than 16% greater nor 25% less than the mean Li/Ca of all samples. Li/Ca minima are observed for samples from 50-60 m.y. and 80-90 m.y., with Li/Ca about 25% lower than in adjacent time intervals. At no time during the past 40 m.y does mean Li/Ca appear to be higher than that at present. Subject to the limitations imposed by sample coverage and diagenesis, a similar conclusion holds for the past 116 m.y. Coupled with an oceanic mass balance model for Li, these data suggest that: (1) oceanic Li concentrations and, therefore, high-temperature hydrothermal circulation fluxes during the past 40 m.y. (and perhaps the past 100 m.y.) have not been more than perhaps 30-40% greater than at present for intervals any longer than a million years at most, and (2) these fluxes were not a factor of two higher 100 m.y. ago. By inference, variations in oceanic crustal generation rates over these time periods are similarly limited. Decreases in hydrothermal circulation fluxes and crustal generation rates or fluctuations up to 20% in these rates of a few million years duration are not necessarily ruled out by the Li/Ca data. The lack of variability in Li/Ca over time is not unequivocal evidence that hydrothermal fluxes have not varied because the rates of removal processes may be linked to changes in input fluxes.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 6.730260 * Median Longitude: 56.929900 * South-bound Latitude: -30.122700 * West-bound Longitude: -19.851300 * North-bound Latitude: 32.002200 * East-bound Longitude: 158.511500
Date/Time Start: 1973-05-31T00:00:00 * Date/Time End: 1980-07-14T00:00:00
Event(s):
30-289 * Latitude: -0.498700 * Longitude: 158.511500 * Date/Time: 1973-05-31T00:00:00 * Elevation: -2206.0 m * Penetration: 1271 m * Recovery: 709.1 m * Location: South Pacific/PLATEAU * Campaign: Leg30 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 133 cores; 1270.8 m cored; 0 m drilled; 55.8 % recovery
32-305 * Latitude: 32.002200 * Longitude: 157.850000 * Date/Time: 1973-08-29T00:00:00 * Elevation: -2903.0 m * Penetration: 640.5 m * Recovery: 212.2 m * Location: North Pacific/CONT RISE * Campaign: Leg32 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 67 cores; 622 m cored; 9 m drilled; 34.1 % recovery
41-366_Site * Latitude: 5.678000 * Longitude: -19.851300 * Date/Time: 1975-02-22T00:00:00 * Elevation: -2853.0 m * Penetration: 12.175 m * Recovery: 5.799 m * Location: North Atlantic/CONT RISE * Campaign: Leg41 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 91 cores; 856.5 m cored; 28.5 m drilled; 67.7% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Delaney, ML; Boyle, EA (1986): (Appendix Table A) Element ratios of planktonic foraminifera from DSDP Hole 30-289. https://doi.org/10.1594/PANGAEA.715074
  2. Delaney, ML; Boyle, EA (1986): (Appendix Table B) Element ratios of planktonic foraminifera from DSDP Hole 32-305. https://doi.org/10.1594/PANGAEA.715075
  3. Delaney, ML; Boyle, EA (1986): (Appendix Table C) Element ratios of planktonic foraminifera from DSDP Site 41-366. https://doi.org/10.1594/PANGAEA.715076
  4. Delaney, ML; Boyle, EA (1986): (Appendix Table D) Element ratios of planktonic foraminifera from DSDP Site 41-369. https://doi.org/10.1594/PANGAEA.715078
  5. Delaney, ML; Boyle, EA (1986): (Appendix Table E) Element ratios of planktonic foraminifera from DSDP Site 74-526. https://doi.org/10.1594/PANGAEA.715077