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| Konnecke, Lk; Coffin, Mf; Charvis, P. |
| We examine the early geological history of the southern Kerguelen Plateau (Indian Ocean) using ocean bottom seismometer (OBS), multichannel seismic (MCS), and Ocean Drilling Program data. Velocity-depth models in the sedimentary Raggatt Basin are constrained by near-range OBS data (refractions and reflections, including multiples and converted shear waves) and migrated MCS data. The models elucidate the significance of lower Cretaceous lava flows, Albian to Coniacian/Santonian terrestrial and terrigenous sediment, and Maastrichtian and Paleocene seismic sequences. The Albian/Aptian basaltic basement complex consists of an upper and a lower series. The upper series is characterized by average V(p)s of 4.6-4.7 km/s, an upward increase of intercalated... |
| Tipo: Text |
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| Ano: 1998 |
URL: https://archimer.ifremer.fr/doc/00297/40788/39808.pdf |
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| Borissova, I; Coffin, Mf; Charvis, P; Operto, S. |
| Microcontinents appear to commonly form on young continental margins close to hot spots, but difficulties in understanding their geology and evolution have inhibited assessment of their global distribution and significance. Thick volcanic accumulations in areas affected by hot spot magmatism only complicate the issue. Elan Bank, a large western salient of the Kerguelen Plateau, is a microcontinent that originally lay between India and Antarctica in Gondwana. Recent regional plate tectonic reconstructions suggest that during Gondwana breakup, Elan Bank and India initially separated from Antarctica, and Elan Bank became isolated in the Southern Ocean via a ridge jump to the north between Elan Bank and India. In Albian time (similar to 108 Ma), voluminous... |
| Tipo: Text |
Palavras-chave: Elan Bank; Marine seismics; Oceanic structures. |
| Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/00225/33665/32079.pdf |
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