Diffuse impact of the Mid-Atlantic Ridge with the Romanche transform: An ultracold ridge-transform intersection

Journal of Geophysical Research: Solid Earth

Volumn 101, Issue 4, 1996, Pages 8043-8054

  Bonatti, E ^a,b   Ligi, M ^a   Carrara, G ^a   Gasperini, L ^a   Turko, N ^c   Perfiliev, S ^c   Peyve, A ^c   Sciuto, P F ^d  

^a CNR   (Italy)

^b International Research Institute for Climate and Society   (United States)

^c RUSSIAN ACADEMY OF SCIENCES   (Russian Federation)

^d UNIVERSITY OF GENOA   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

BATHYMETRY; DIFFUSE IMPACT; MID-OCEAN RIDGES; RIDGE/TRANSFORM INTERSECTION; RIFT VALLEY; SEA FLOOR TOPOGRAPHY; SEISMIC REFLECTION; TRANSFORM FAULT; TRANSFORM FAULTS; ULTRACOLD RIDGE- TRANSFORM INTERSECTION;

ATLANTIC, MID-ATLANTIC RIDGE; ATLANTIC, MID-ATLANTIC RIDGE, ROMANCHE TRANSFORM;

EID: 0029729774     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/95jb02249     Document Type: Article

References (43)

1. Bender, J. F., C. H. Langmuir, and G. N. Hanson, Petrogenesis of basalt glasses from the Tamago region, East Pacific Rise, J. Petrol., 25, 213-254, 1984.
2. Blackman, D. K. and D. W. Forsyth, Axial topographic relief associated with ridge-transform intersections, Earth Planet. Sci. Lett., 95, 115-129, 1989.
3. Bonatti, E., and J. Honnorez, Sections of the Earth's crust in the equatorial Atlantic, J. Geophys. Res., 81, 4104-4116, 1976.
4. Bonatti, E., M. Sarntheim, A. Boersma, M. Gorini, and J. Honnorez, Neogene crustal emersion and subsidence at the Romanche fracture zone, equatorial Atlantic, Earth Planet. Sci. Lett., 35, 369-383, 1979.
5. Bonatti, E., A. Peyve, P. Kepezhinskas, N. Kurentsova, M. Seyler, S. Skolotnev, and G. Udintsev, Upper mantle heterogeneity below the Mid-Atlantic Ridge, 0-15°N, J. Geophys. Res., 97, 4461-4476, 1992.
6. Bonatti, E., M. Seyler, and N. Sushevskaya, A cold suboceanic mantle belt at the Earth equator, Science, 261, 315-320, 1993.
7. Bonatti, E., M. Ligi, L. Gasperini, A. Peyve, Y. Raznitsin, and Y. J. Chen, Transform migration and vertical tectonics at the Romanche fracture zone, equatorial Atlantic, J. Geophys. Res., 99, 21779-21802, 1994.
8. 2-O, Geol. Soc. Am. Bull., 60, 439-460, 1949.
9. Cande, S. C., J. L. LaBrecque, and W.F. Haxby, Plate Kinematics of the South Atlantic: chron C34 to the present, J. Geophys. Res., 93, 13479-13492, 1988.
10. Chen, Y., Thermal model of oceanic transform faults, J. Geophys. Res., 93, 8839-8851, 1988. Coleman, R. G., Petrological and geophysical nature of serpentinites, Geol. Soc Am. Bull., 82, 918-987, 1971.
11. Chen, Y., Thermal model of oceanic transform faults, J. Geophys. Res., 93, 8839-8851, 1988. Coleman, R. G., Petrological and geophysical nature of serpentinites, Geol. Soc Am. Bull., 82, 918-987, 1971.
12. Crane, K., The spacing of rift axis highs: Dependence on diapiric processes in the underlying asthenosphere, Earth Planet. Sci. Lett., 72, 405-414, 1985.
13. Engeln, J. F., D. A. Wiens, and S. Stein, Mechanisms and depths of Atlantic transform earthquakes, J. Geophys. Res., 91, 548-577, 1986.
14. Forsyth, D. W., and B. Wilson, Three dimensional temperature structure of a ridge-transform-ridge system, Earth Planet. Sci. Lett., 70, 355-362, 1984.
15. Fox, P. J., and D. Gallo, The tectonics of ridge-transform intersections, Tectonophysics, 104, 204-242, 1984.
16. Francheteau, J., and R. D. Ballard, The East Pacific Rise near 21°N 13°N and 20° S: Influences for along strike variability of axial processes of the mid ocean ridge, Earth Planet. Sci Lett., 64, 93-101, 1983.
17. Francis, T. G., Serpentinization faults and their role in the tectonics of slow spreading ridges, J. Geophys. Res., 86, 11616-11622, 1981.
18. Gorini, M. A., The tectonic fabric of the equatorial Atlantic and adjoining continental margins: Gulf of Guinea to northeastern Brazil, Ph.D. thesis, 116 p., Columbia Univ., New York, 1977.
19. Heezen, B. C., E. T. Bunce, J. B. Hersey, and M. Tharp, Chain and Romanche fracture zones, equatorial Atlantic, Deep Sea Res., 11, 30-33, 1964.
20. Honnorez, J., J. Mascle, C. Basile, P. Tricart, M. Villeneuve, and H. Bertrand, Mapping of a segment of the Romanche fracture zone: A morphostructural analysis of a major transform fault of the equatorial Atlantic, Geology, 19, 795-798, 1991.
21. Hostletler, P. B., R. G. Coleman, F. A. Mumpton, and B. W. Evans, Bruche in alpine serpentinites, Am. Mineral., 51, 75-98, 1966.
22. Jordan, T. H., Mineralogies, densities and seismic velocities of garnet lherzolites and their geophysical implications, in The Mantle Sample: Inclusion in Kimberlites and other Volcanics, edited by F. R. Boyd and H. O. Meyer, Washington, D. C., pp. 1-14, 1979.
23. Karson, J. A, and J. H. B. Dick , Tectonics of the ridge-transform intersection at the Kane fracture zone, Mar. Geophys. Res., 6, 51-98, 1983.
24. Klein, E. M., and C. H. Langmuir, Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness, J. Geophys. Res., 92, 8089-8115, 1987.
25. MacDonald, A. H., and W.F. Fyfe, Role of serpentinization in seafloor environments, Tectonophysics, 116, 113-135, 1985.
26. Mamaloukas-Frangoulis, V., Le zones de fracture oceaniques. L' example de Z.F. Vema et Romanche (ocean Atlantique), Ph.D. thesis, 288 pp., Univ. de Bretagne Occidentale, Brest, France, 1992.
27. Mamaloukas-Frangoulis, V., J. M. Auzende, D. Bideau, E. Bonatti, M. Cannat, J. Honnorez, Y. Lagabrielle, C. Mevel, and H. D. Needham, In situ study of the eastern RTI of the Vema fracture zone, Tectonophysics, 190, 55-71, 1991.
28. Melson, W. G., E. Jarosevich, R. Cifelli, and G. Thompson, Alkali olivine basalt dredged near St. Paul's Rocks, Nature, 215, 381-382, 1967.
29. Michael, P. J., and E. Bonatti, Peridotite composition from the North Atlantic: Regional and tectonic variations and implications for partial melting. Earth Planet. Sci. Lett., 73 ,91-104, 1985.
30. Monti, S., and H. Mercier, Carte bathymetrique de la zone de fracture de la Romanche (1/1000.000, Seabeam EM12) IFREMER DRO/GM, Cartographie, Brest, France, 1991.
31. O'Hanley, D. S., Solution of the volume problem in serpentinization, Geology, 20, 705-708, 1992.
32. O'Hara, M. J., Is there an Icelandic mantle plume?, Nature, 253, 708-710, 1975.
33. Oxburgh, E. R., and E. M. Parmentier, Compositional and density stratification in the oceanic lithosphere: Causes and consequences, J. Geol. Soc. London, 133, 343-354, 1977.
34. Parker, R. L., and D. W. Oldenburg, Thermal Model of ocean ridges, Nature, 242, 137-140, 1973.
35. Parmentier, E. M., and D. W. Forsyth, Three-dimensional flow beneath a slow spreading ridge axis: A dynamic contribution to the deepening of the median valley, J. Geophys. Res., 90, 678-685, 1985.
36. Phipps Morgan, J., and D. W. Forsyth, Three-dimensional flow and temperature perturbations due to a transform offset, J. Geophys. Res., 93, 2955-2966, 1988.
37. Searle, R. C., M. V. Thomas, and E. J. W. Jones, Morphology and tectonics of the Romanche transform and its environs, Mar. Geophys. Res., 16, 427-453, 1994.
38. Seyfried, W. E., and W. Dibble, Seawater-peridotite interaction at 300°C and 500 bars: Implications for the origin of oceanic serpentinites, Geochim. Cosmoch. Acta, 44, 309-321, 1980.
39. Schilling, J. G., B. B. Hanan, B. McCully, and R. H. Kingsley, Influence of the Sierra Leone mantle plume on the equatorial Mid-Atlantic Ridge: A Nd-Sr-Pb study, J. Geophys. Res., 99, 12,005-12,028, 1994.
40. Thayer, T. P., Serpentinization considered as a constant volume metasomatic process, Am. Mineral., 51, 685-710, 1966.
41. Tucholke, B. E., and H. Shouten, Kane fracture zone. Mar. Geophys. Res., 10, 1-40, 1988.
42. Whitehead, J. A., H. J. B. Dick, and H. Shouten, A mechanism for magmatic accretions under spreading centers, Nature, 312, 146-148, 1984.
43. Zhang, Y. S., and T. Tanimoto, Ridges, hotspots and their interaction as observed in seismic velocity maps. Nature, 235, 45-49, 1992.