Along-axis variability in crustal accretion at the Mid-Atlantic Ridge: Results from the OCEAN study

Journal of Geophysical Research: Solid Earth

Volumn 101, Issue 6, 1996, Pages 13673-13688

  Henstock, Timothy J ^a,c   White, Robert S ^a   McBride, John H ^b,d  

^a UNIVERSITY OF CAMBRIDGE   (United Kingdom)

^b UNIVERSITY OF CAMBRIDGE   (United Kingdom)

^c RICE UNIVERSITY   (United States)

^d ILLINOIS STATE GEOLOGICAL SURVEY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CRUSTAL ACCRETION; MARINE GEOPHYSICS; MID-OCEAN RIDGES; OCEAN EXPERIMENT; SEISMIC REFLECTION; SEISMIC REFRACTION;

ATLANTIC, MID-ATLANTIC RIDGE;

EID: 0030485470     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/96jb00092     Document Type: Article

References (36)

1. Banda, E., C. R. Ranero, J. J. Dañobeitia, and A. Rivero, Seismic boundaries of the eastern Central Atlantic Mesozoic crust from multichannel seismic data, Geol. Soc. Am. Bull., 104, 1340-1349, 1992.
2. Bell, R. E., and W. R. Buck, Crustal control of ridge segmentation inferred from observations of the Reykjanes Ridge, Nature. 357, 583-586, 1992.
3. Blackman, D. K., and D. W. Forsyth, Isostatic compensation of features of the Mid-Atlantic Ridge: 25-27°30′S, J. Geophys. Res., 96, 11,741-11,758, 1991.
4. Chapman, C. H., Ray theory and its extensions: WKBJ and Maslov seismograms, J. Geophys., 58, 27-43, 1985.
5. Detrick, R. S., R. S. White, and G. M. Purdy, Crustal structure of North Atlantic fracture zones, Rev. Geophys., 31, 439-458, 1993.
6. Fowler, C. M. R., Crustal structure of the Mid-Atlantic Ridge at 37°N, Geophys. J. R. Astron. Soc., 47, 459-491, 1976.
7. Garmany, J., Accumulations of melt at the base of young oceanic crust, Nature, 340, 628-632, 1989.
8. Haxby, W. F., and E. M. Parmentier, Thermal contraction and the state of stress in the oceanic lithosphere, J. Geophys. Res., 93, 6419-6429, 1988.
9. Henstock, T. J., R. S. White, and J. H. McBride, The OCEAN study area: Tectonic history from magnetic anomalies and seismic reflectivity, J. Geophys. Res., 100, 20,059-20,078, 1995.
10. Kent, D. V., and F. M. Gradstein, A Jurassic to recent chronology, in The Geology of North America, vol. M, The Western North Atlantic Region, edited by P. R. Vogt and B. E. Tucholke, pp. 45-50, Geol. Soc. of Am., Boulder, Colo., 1986.
11. Klitgord, K. D., and H. Schouten, Plate kinematics of the central Atlantic, in The Geology of North America, vol. M, The Western North Atlantic Region, edited by P. R. Vogt and B. E. Tucholke, pp. 351-378, Geol. Soc. of Am., Boulder, Colo., 1986.
12. Kong, L. S., S. C. Solomon, and G. M. Purdy, Microearthquake characteristics of a mid-ocean ridge along-axis high, J. Geophys. Res., 97, 1659-1685, 1992.
13. Kuo, B.-Y., and D. W. Forsyth, Gravity anomalies of the ridge-transform system in the South Atlantic between 31 and 34.5°S: Upwelling centres and variations in crustal thickness, Mar. Geophys. Res., 10, 205-232, 1988.
14. Larner, K., R. Chambers, M. Yang, W. Lynn, and W. Wai, Coherent noise in marine seismic data, Geophysics, 48, 854-886, 1983.
15. Lin, J., G. M. Purdy, H. Schouten, J.-C. Sempéré. and C. Zervas, Evidence from gravity data for focused magmatic accretion along the Mid-Atlantic Ridge, Nature, 344, 627-632, 1990.
16. Macdonald, K. C., P. J. Fox, L. J. Perram, M. F. Eisen, R. M. Haymon, S. P. Miller, S. M. Carbotte, M.-.H. Cormier, and A. N. Shor, A new view of the mid-ocean ridge from the behaviour of ridge-axis discontinuities, Nature, 335, 217-225, 1988.
17. McBride, J. H., R. S. White, T. J. Henstock, and R. W. Hobbs, Complex structure along a Mesozoic seafloor spreading ridge: BIRPS deep seismic reflection, Cape Verde abyssal plain, Geophys. J. Int., 119, 453-478, 1994.
18. McCarthy, J., J. C. Mutter, J. L. Morton, N. H. Sleep, and G. A. Thompson, Relic magma chamber structures preserved within the Mesozoic North Atlantic crust?, Geol. Soc. Am. Bull., 100, 1423-1436, 1988.
19. Minshull, T. A., R. S. White, J. C. Mutter, P. Buhl, R. S. Detrick, C. A. Williams, and E. Morris, Crustal structure at the Blake Spur fracture zone from expanding spread profiles, J. Geophys. Res., 96, 9955-9984, 1991.
20. Morris, E., and R. S. Detrick, Three-dimensional analysis of gravity anomalies in the MARK area (Mid-Atlantic Ridge, 23°N), J. Geophys. Res., 96, 4355-4366, 1991.
21. Morris, E., R. S. Detrick, T. A. Minshull, J. C. Mutter, R. S. White, W. Su, and P. Buhl, Seismic structure of oceanic crust in the western North Atlantic, J. Geophys. Res., 98, 13.879-13.903, 1993.
22. Mutter, J. C., and J. A. Karson, Structural processes at slow spreading ridges, Science, 257, 627-634, 1992.
23. Mutter, J. C., and the NAT Study Group, Multichannel seismic images of the oceanic crust's internal structure: Evidence for a magma chamber beneath the Mesozoic Mid-Atlantic Ridge, Geology, 13, 679-632, 1985.
24. NAT Study Group, North Atlantic Transect: A wide aperture, two-ship multichannel seismic investigation of the oceanic crust, J. Geophys. Res., 90, 10,321-10,341, 1985.
25. Purdy, G. M., and R. S. Detrick, Crustal structure of the Mid-Atlantic Ridge at 23°N from seismic refraction studies, J. Geophys. Res., 91, 3739-3762, 1986.
26. Rona, P. A., L. Widenfalk, and K. Boström, Serpentinized ultramafics and hydrothermal activity at the Mid-Atlantic Ridge crest near 15°N. J. Geophys. Res., 92, 1417-1427, 1987.
27. Salisbury, M. H., and N. I. Christensen, The seismic velocity structure of a traverse through the Bay of Islands ophiolite complex, Newfoundland: An exposure of oceanic crust and upper mantle, J. Geophys. Res., 83, 805-817, 1978.
28. Sempéré, J. C., G. M. Purdy, and H. Schouten, Segmentation of the Mid-Atlantic Ridge between 24°N and 30°40′N, Nature, 344, 427-431, 1990.
29. Sinha, M. C., and K. E. Louden, The Oceanographer fracture zone, 1, Crustal structure from seismic refraction studies, Geophys. J. R. Astron. Soc., 75, 713-736, 1983.
30. Tolstoy, M., A. J. Harding, and J. A. Orcutt, Crustal thickness on the Mid-Atlantic Ridge: Bulls-eye gravity anomalies and focused accretion, Science, 462, 726-729, 1993.
31. Tucholke, B. E., and J. Lin, A geological model for the structure of ridge segments in slow spreading ocean crust, J. Geophys. Res., 99, 11,973-11,958, 1994.
32. White, R. S., Atlantic oceanic crust: Seismic structure of a slow spreading ridge, in Ophiolites and Oceanic Lithosphere, edited by I. G. Gass, S. J. Lippard, and A. W. Shelton, Geol. Soc. Spec. Publ. London, 13, 101-111, 1984.
33. White, R. S., R. S. Detrick, M. C. Sinha, and M. H. Cormier, Anomalous seismic crustal structure of oceanic fracture zones, Geophys. J. R. Astron. Soc., 79, 779-798, 1984.
34. White, R. S., R. S. Detrick, J. Mutter, P. Buhl, T. Minshull, and E. Morris, New seismic images of oceanic crustal structure, Geology, 18, 462-465, 1990.
35. White, R. S., D. McKenzie, and R. K. O'Nions, Oceanic crustal thickness from seismic measurements and rare earth element inversions, J. Geophys. Res., 97, 19,683-19,715, 1992.
36. White, R. S., J. H. McBride, T. J. Henstock, and R. W. Hobbs, Internal structure of Mesozoic oceanic crust, Geology, 22, 597-600, 1994.