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| Auzende, Jean-marie; Dickens, Gerald R.; Van De Beuque, Sabrina; Exon, Neville F.; François, Caroline; Lafoy, Yves; Voutay, Olivier. |
| The Lord Howe Rise (LHR) is a large, complex, and poorly studied fragment of thinned continental crust submerged 750–3000 m beneath the oligotrophic waters of the central Tasman Sea (Figure 1). Deep seismic profiles taken during recent cruises in the region have revealed an intriguing phenomenon: the eastern slope of the LHR has a prominent and extensive bottom simulating reflector (BSR) that cross‐cuts lithology at 0.65–0.75 s two‐way travel time (twt) [Exon et al., 1998; Lafoy et al., 1998]. Given best estimates for sonic velocity (1600 m/s) and thermal gradients (0.9+0.04°C/m) in sediment on the LHR, predicted temperatures and pressures at the depth of the BSR lie on the CH4‐CH4 hydrate‐seawater equilibrium curve. Thus, the BSR on the LHR most likely... |
| Tipo: Text |
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| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00451/56251/57822.pdf |
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