Godfrey, L V (2002): Chemical and isotope compositions of sediments from DSDP Hole 86-576A and Core LL44-GPC-3 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.711452, Supplement to: Godfrey, LV (2002): Temporal changes in the lead isotopic composition of red clays: comparison with ferromanganese crust records. Chemical Geology, 185(3-4), 241-254, https://doi.org/10.1016/S0009-2541(01)00406-5
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Abstract:
A record of changes in Pb and Sr isotopic composition of two cores (DSDP 86-576A and LL44- GPC-3) from the red clay region of the central North Pacific has been determined for the past 60-65 million years. The isotope records of the eolian silicate fraction of the red clays reflect the change in source area as the core sites migrated under different wind systems. The Sr isotope compositions of eolian silicate material are consistent with Asian loess and North American arc volcanism that has been recognized from mineralogical studies. The silicate-bound eolian Pb isotopic compositions similarly reflect Asian loess and arc volcanism. The isotope records of three ferromanganese crusts from similar locations in the central Pacific are similar to the eolian component of red clays, but offset to less radiogenic values. This may be due to two mechanisms: (1) Pb that can be removed from eolian material by seawater is much less radiogenic, or less likely (2) hydrothermal Pb can be transported further away from venting sites through particle exchange with seawater, despite hydrothermal venting acting as a net sink of oceanic Pb. The temporal changes in Pb isotopes in the ferromanganese crusts, bulk red clays and eolian silicates are similar although offset from each other suggesting that eolian deposition is an important source of Pb to seawater and to ferromanganese crusts. This contrasts with the Atlantic and Southern Ocean where more intense deep water flow leads to isotopic gradients in FeMn crusts that do not reflect surface water conditions immediately above the crust. A mechanism is proposed which accounts for Pacific deepwater Pb being isotopically influenced by eolian deposition.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 31.344000 * Median Longitude: -176.778200 * South-bound Latitude: 30.331700 * West-bound Longitude: 164.275300 * North-bound Latitude: 32.356300 * East-bound Longitude: -157.831700
Date/Time Start: 1982-05-16T00:00:00 * Date/Time End: 1982-05-16T00:00:00
Event(s):
86-576A * Latitude: 32.356300 * Longitude: 164.275300 * Date/Time: 1982-05-16T00:00:00 * Elevation: -6217.0 m * Penetration: 65.7 m * Recovery: 66.2 m * Location: North Pacific * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 65.7 m cored; 0 m drilled; 100.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
Download Data
Datasets listed in this publication series
- Godfrey, LV (2002): (Appendix A) Depth, age, element and isotope compositions for bulk material in DSDP Hole 86-576A. https://doi.org/10.1594/PANGAEA.711448
- Godfrey, LV (2002): (Appendix A) Depth, age, element and isotope compositions for bulk material in Core LL44-GPC-3. https://doi.org/10.1594/PANGAEA.711449
- Godfrey, LV (2002): (Appendix B) Isotope and element compositions for silicate material in DSDP Hole 86-576A. https://doi.org/10.1594/PANGAEA.711450
- Godfrey, LV (2002): (Appendix B) Isotope and element compositions for silicate material in Core LL44-GPC-3. https://doi.org/10.1594/PANGAEA.711451