(Table 1, page 641) Hf isotope time series for the uppermost part of a ferromanganese crust from the San Pablo ferro-manganese pavement
Cobertura |
LATITUDE: 39.000000 * LONGITUDE: -60.950000 * DATE/TIME START: 1967-06-01T00:00:00 * DATE/TIME END: 1967-06-01T00:00:00 * MINIMUM ELEVATION: -1700.0 m * MAXIMUM ELEVATION: -1700.0 m |
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Data(s) |
05/07/2002
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Resumo |
The Hf isotope composition of seawater does not match that expected from dissolution of bulk continental crust. This mismatch is generally considered to be due to retention of unradiogenic Hf in resistant zircons during incomplete weathering of continental crust. During periods of intense glacial weathering, zircons should break down more efficiently, resulting in the release of highly unradiogenic Hf to the oceans. We test this hypothesis by comparing Nd and Hf isotope time series obtained from NW Atlantic ferromanganese crusts. Both isotope systems show a decrease associated with the onset of northern hemisphere glaciation. The observed changes display distinct trajectories in epsilon Nd- epsilon Hf space, which differ from previously reported arrays of bulk terrestrial material and seawater. Such patterns are consistent with the release of highly unradiogenic Hf from very old zircons, facilitated by enhanced mechanical weathering. |
Formato |
text/tab-separated-values, 72 data points |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.862568 doi:10.1594/PANGAEA.862568 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Grant, J Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, doi:10.7289/V52Z13FT Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, doi:10.7289/V53X84KN |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: van de Flierdt, Tina; Frank, Martin; Lee, Der-Chuen; Halliday, Alex N (2002): Glacial weathering and the hafnium isotope composition of seawater. Earth and Planetary Science Letters, 201(3-4), 639-647, doi:10.1016/S0012-821X(02)00731-8 |
Palavras-Chave | #DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Dredge; DRG; Elevation of event; epsilon-Hafnium; epsilon-Hafnium, standard deviation; Hafnium 176/Hafnium 177; Hafnium 176/Hafnium 177, error; HUD67/19; HUD67/19-54; Hudson; Latitude of event; Longitude of event; Multi-Collector ICP-MS (MC-ICP-MS), Nu Plasma; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Sample code/label; Sample ID; San Pablo Seamount |
Tipo |
Dataset |