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| Froger, V; Lancelot, Y. |
| The western part of the Pacific plate, where the oceanic crust is of Jurassic age, has undergone exceptional volcanic activity during the Cretaceous. It has produced numerous volcanoes (oceanic islands, guyots, seamounts) as well as very thick accumulation of volcanogenic material in the deep basins. The Mesopac cruise of the R/V Jean Charcot in the Nauru Basin obtained multichannel seismic profiles for the first time in these regions. This technique aimed at estimating the thickness of the cretaceous volcanics and locating the top of the underlying Jurassic crust. The results, when compared with those of DSDP drill holes, demonstrate that the abnormally shallow depth of the Nauru Basin results from an accumulation of flows and sills that constitute a... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37922/36003.pdf |
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| Lancelot, Y; Froger, V; Cheminee, J L; Galisson, H; Larson, R; Mauffret, A; Schlanger, So; Sclater, J G. |
| The Mesopac Cruise was the first multichannel seismic study of the western basins of the Pacific Plate. It was concentrated in the Nauru Basin and in the western area of the Central Pacific Basin. Profiles were calibrated with drilling results from DSDP Sites 462 and 169. For the first time one could observe reflectors within the Cretaceous volcanic complex down to approximately equals 8.5 seconds. Profiles did not allow direct observation of the top of the oceanic crust. After correcting for the load on top of the oceanic crust, results suggest that it cannot lie much deeper than those reflectors. If the oceanic crust lies only a few hundred meters beneath the 2.4 km thick complex, it would be right on the normal thermal subsidence curve corresponding to... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37906/35987.pdf |
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