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| Von Huene, R; Uyeda, S. |
| Investigations of convergent margins along the IPOD transects support the concept of ocean floor spreading in back-arc basins and the concept of tectonically accreted sediment at the front of convergent margins. However, not all convergent margins have large accreted complexes, and other less frequently used concepts are required in the interpretations of these convergent margins. If the present rates of plate convergence are accepted, then much sediment that entered the trenches studied is presumably subducted rather than accreted. In some instances, the continental framework is truncated and somehow removed by tectonic erosion. Some convergent margins have subsided significantly during subduction. The crust above the Benioff zone appears to have been... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00245/35659/34168.pdf |
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| Hussong, D M; Uyeda, S. |
| The resultsof recently completed geological and geophysical studies of the tec tonically active protions of the Mariana Island arc system are described. Leg 60 of the Deep Sea Drilling Project, and the drill site selection cruises that preceeded Leg 60, provided the bulk of these new data. The Mariana forearc region consists of remnants of the Palau-Kyushu Ridge (rifted in the Oligocene) and the West Mariana Ridge (rifted in the late Miocene-early Pliocene), partially covered by modern arc sediments and volcanoes. Volcanism in the Mariana arc system seems to be continuous since Eocene, although periods of possible increased or decreased levels of volcanic activity can be interpreted from the drilling results. The hydrothermally active Mariana Trough has... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00246/35692/34200.pdf |
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