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| Bourgeois, J; Huchon, P. |
| The Mendana Fracture Zone is a major intra-oceanic feature on the Nazca Plate off Peru. During the Seaperc cruise of R/V Jean charcot in 1986, Seabeam bathymetric data, single channel seismic records, geomagnetic and gravity measurements and heat flow data were obtained over this area. In this paper, we show that the Mendana Fracture Zone is actively opening perpendicular to its trend, resulting in the formation of new oceanic crust since about 3.5 Ma. This new rift is propagating westward along the fracture zone at a velocity of about 17 cm/yr with respect to the trench). The origin of the Mendana spreading centre would be the extensional stress acting parallel to the Peru Trench in this area. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37910/35991.pdf |
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| Michaud, F; Bourgeois, J; Auboulin, J. |
| Marine geophysical surveys using Seabeam, single channel seismic reflection, gravity and magnetic profiling were conducted along the Acapulco Trench (21 degree 30'N-18 degree 00'N) during the Seamat Cruise of R/V Jean Charcot in June-July 1987. The surveyed areas are centered around latitude 18 degree N and 20 degree 30'N across the trench. Detailed surveying was also conducted at the East Pacific Rise (EPR) - Rivera Fracture Zone (RFZ) eastern junction. Unpublished bathymetric data of the Searise Cruise of R/V Jean Charcot conducted at the Western junction of EPR and RFZ in 1980 are also presented. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37931/36012.pdf |
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| Bourgeois, J; Renard, V; Michaud, F; Mercier De Lepinay, B. |
| The data of the Seamat Cruise indicate that: a) the junction between the East Pacific Rise and the Rivera Fracture Zone is located 165 km seaward the Acapulco Trench axis at 18 degree 30'N latitude and 106 degree 15'W longitude; and b) the East Pacific Rise axial ridge connects the Rivera Transverse Ridge trough an overshot ridge. This situation makes the Rivera Fracture Zone located eastward of the junction progressively inactive and documents a westward jump of the junction. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37951/36032.pdf |
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