| タイトル | Evidence of volcanic ash at a K-T boundary section: Ocean drilling program hole 690 C, Maud Rise, Weddell Sea off East Antarctica |
| 本文（外部サイト） | http://hdl.handle.net/2060/19890012039 |
| 著者（英） | Bryant, W. R.; Burckle, L. H.; Futterer, D. K.; Kennett, James P.; Pospichal, J.; Barker, P. F.; Oconnell, S.; Wise, S. W.; Egeberg, P. K.; Hamilton, N. |
| 著者所属（英） | Florida State Univ.|Southampton Univ. |
| 発行日 | 1988-01-01 |
| 言語 | eng |
| 内容記述 | Rare vitric volcanogenic ash but more abundant clay minerals considered volcanogenic in origin are associated with an expanded and essentially complete K-T boundary sequence from Ocean Drilling Project (ODP) Hole 690 C on Maud Rise in the Weddell Sea off East Antarctica. Results at this writing are preliminary and are still based to some extent on shipboard descriptions. Further shore-based studies are in progress. It would appear, however, that the presence of volcanic ash and altered ash in the Danian section beginning at the biostratigraphically and paleomagnetically determined K-T boundary on Maud Rise can be cited as evidence of significant volcanic activity within the South Atlantic-Indian Ocean sector of the Southern Ocean coincident with the time of biotic crises at the end of the Maestrichtian. This is a postulated time of tectonic and volcanic activity within this Southern Hemisphere region, including possible initiation of the Reunion hot spot and a peak in explosive volcanism on Walvis Ridge (1) among other events. A causal relationship with the biotic crisis is possible and volcanism should be given serious consideration as a testable working hypothesis to explain these extinctions. |
| NASA分類 | OCEANOGRAPHY |
| レポートNO | 89N21410 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/142448 |
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