(Table 1, page 641) Hf isotope time series for the uppermost part of a ferromanganese crust from the San Pablo ferro-manganese pavement
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2002
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| _version_ | 1867169112735612928 |
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| author | van de Flierdt, Tina Frank, Martin Lee, Der-Chuen Halliday, Alex N |
| author_facet | van de Flierdt, Tina Frank, Martin Lee, Der-Chuen Halliday, Alex N |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_862568 |
| institution | PANGAEA |
| language | en |
| publishDate | 2002 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1, page 641) Hf isotope time series for the uppermost part of a ferromanganese crust from the San Pablo ferro-manganese pavement van de Flierdt, Tina Frank, Martin Lee, Der-Chuen Halliday, Alex N DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Dredge; DRG; Elevation of event; Hafnium-176/Hafnium-177 ratio; Hafnium-176/Hafnium-177 ratio, 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; ε-Hafnium; ε-Hafnium, standard deviation 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. |
| title | (Table 1, page 641) Hf isotope time series for the uppermost part of a ferromanganese crust from the San Pablo ferro-manganese pavement |
| topic | DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Dredge; DRG; Elevation of event; Hafnium-176/Hafnium-177 ratio; Hafnium-176/Hafnium-177 ratio, 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; ε-Hafnium; ε-Hafnium, standard deviation |
| url | https://doi.org/10.1594/PANGAEA.862568 |