Anomalous mantle at 45°N mid-atlantic ridge?

Journal of Geophysical Research: Solid Earth

Volumn 104, Issue B12, 1999, Pages 29335-29349

  Mello, S L M ^a,b,c   Cann, J R ^a   Fowler, C M R ^a  

^a UNIVERSITY OF LEEDS   (United Kingdom)

^b UNIVERSITY OF LONDON   (United Kingdom)

^c FLUMINENSE FEDERAL UNIVERSITY   (Brazil)

Author keywords

[No Author keywords available]

Indexed keywords

GRAVITY ANOMALY; HOT SPOT; LITHOSPHERE; MID-OCEAN RIDGE;

ATLANTIC OCEAN; MID-ATLANTIC RIDGE;

EID: 0033544976     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/1999jb900267     Document Type: Article

References (64)

1. Anderson, R.N., O.P. Mckenzie, and J.G. Sclater, Gravity, bathymetry and convection within the Earth, Earth Planet. Sci. Lett., 18,391-407, 1973.
2. Aumento, F., B.D. Loncarevic, and D.I. Ross, Hudson geotraverse: Geology of the Mid-Atlantic Ridge at 45°N, Philos. Trans. R. Soc. London A, 268,623-650, 1971.
3. Birch, F., Compressibility; elastic constants, in Handbook of Physical Constants, Mem. Geol. Soc. Am., 97,107-173, 1966.
4. Bowin, C., G. Thompson, and J.-G. Schilling, Residual geoid anomaly in Atlantic Ocean basin: Relationship to mantle plumes, J. Geophys. Res.,89,9905-9918, 1984.
5. Cann, J.R., Petrology of basement rocks from Palmer Ridge, NE Atlantic, Philos. Trans. R. Soc. London A, 268,605-617, 1971.
6. Cann, J.R., J. Tarney, J. Varet, and D.A. Wood, Mantle heterogeneity in the North Atlantic: Evidence from Leg 49 geochemistry, Initial Rep. Deep Sea Drill. Proj., 49,841-850, 1978.
7. Chen, Y., and W.J. Morgan, A non-linear rheology model for midocean ridge axis topography, J. Geophys. Res., 95,17,571-17,581, 1990.
8. Cochran, J.R., and M. Talwani, Free-air gravity anomalies in the world's oceans: Their relationship to residual elevation, Geophys. J. R. Astron. Soc., 50,495-552, 1977.
9. Cochran, J.R., and M. Talwani, Gravity anomalies, regional elevation, and the deep structure of the North Atlantic, J. Geophys. Res., 83,4907-4924, 1978.
10. Detrick, R., H.D. Needham, and V. Renard, Gravity anomalies and crustal thickness variations along the Mid-Atlantic Ridge between 33°N and 40°N, J. Geophys. Res., 100,3767-3787, 1995.
11. Erlank, A.J., and E.J.D. Kable, The significance of incompatible elements in Mid-Atlantic Ridge basalts from 45°N with particular reference to Zr/Nb, Contrib. Mineral. Petrol, 54,281-291, 1976.
12. Fowler, C.M.R., Crustal structure of the Mid-Atlantic Ridge crest at 37°N, Geophys. J. R. Astron. Soc., 47,459-491, 1976.
13. Fowler, C.M.R., The Mid-Atlantic Ridge: Structure at 45°N, Geophys. J. R. Astron. Soc., 54,167-183, 1978.
14. Fowler, C.M.R., and C.E. Keen, Oceanic crustal structure - MidAtlantic Ridge at 45°N, Geophys. J. R. Astron. Soc., 56,219-226, 1979.
15. Frey, F.A., M.A. Haskin, J.A. Poetz, and L.A. Haskin, Rare-earth abundances in some basic rocks, J. Geophys. Res., 73,6085-6097, 1968.
16. Haxby, W.F., and D.L. Turcotte, On isostatic geoid anomalies, J. Geophys. Res., 83,5473-5478, 1978.
17. Hayes, D.E., Age-depth relationship and depth anomalies in the Southeast Indian Ocean and South Atlantic Ocean, J. Geophys. Res., 93, 2937-2954,1988.
18. Heestand, R.L., and S.T. Crough, The effect of hot spots on the oceanic age-depth relation, J. Geophys. Res., 86,6107-6114, 1981.
19. 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.
20. 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. Am., Boulder, Colo., 1986.
21. Larson, R.L., W.C. Pitman, X. Golobchenko, S.C. Cande, J.F. Dewey, W.F. Haxby, and J.L. LaBrecque, The Bedrock Geology of the World (color map), W. H. Freeman, New York, 1985.
22. Laughton, A.S., D.G. Roberts, and R. Graves, Bathymetry of the northeast Atlantic: Mid-Atlantic Ridge to southwest Europe, Deep Sea Res., 22,791-810, 1975.
23. Le Douaran, S., and J. Francheteau, Axial depth anomalies from 10° to 50° North along the Mid-Atlantic Ridge: Correlation with other mantle properties, Earth Planet. Sci. Lett., 54,29-47, 1981.
24. Loncarevic, B.D., C.S. Mason, and D.H. Mathews, The Mid-Atlantic Ridge near 45°N, I., The Median Valley, Can. J. Earth Sci., 3,327-349, 1966.
25. Louden, K.E., A note on the isostatic compensation and origin of King's Trough, Geophys. J. R. Astron. Soc., 75,555-563, 1983.
26. Matthews, D.H., A.S. Laughton, D.T. Pugh, E.J.W. Jones, J. Sunderland, M. Takin, and M. Bacon, Crustal structure and origin of Peake and Freen Deeps, N.E. Atlantic, Geophys. J.R. Astr. Soc., 75,517-542, 1969.
27. McKenzie, D. P., The generation and compaction of partially molten rock, J. Petrol., 25,713-765, 1984.
28. Muir, I.D., and C.E. Tilley, Basalts from the northern part of the rift zone of the Mid-Atlantic Ridge, J. Petrol., 5,409-434, 1964.
29. Muller, R.D., W.R. Roest, J.-Y. Royer, L.M. Gahagan, and J.G. Sclater, Digital isochrons of the world's ocean floor, J. Geophys. Res., 702,3211-3214,1997.
30. Mutter, J.C., and J.A. Karson, Structural processes at slow-spreading ridges, Science, 257,627-634, 1992.
31. National Geophysical Data Center, Etopo-5 bathymetry/topography data, Data Announce., 88-MGG-02, Natl. Oceanic and Atmos. Admin., U.S. Dep. of Commer., Boulder, Colo., 1988.
32. Nixon, P.H., Mantle Xenoliths, 844 pp., John Wiley, New York, 1987.
33. Parsons, B., and J.G. Sclater, An analysis of the variation of ocean floor bathymetry and heat floor with age, J. Geophys. Res., 82,803-827, 1977.
34. Pitman, W.C., and M. Taiwanl, Sea-floor spreading in the North Atlantic, Geol. Soc. Am. Bull., 83,619-645, 1972.
35. Poreda, R., J.-G. Schilling, and H. Craig, Helium and hydrogen isotopes in ocean ridge basalts north and south of Iceland, Earth Planet. Sci. Lett., 78,1 -17, 1986.
36. Purdy, G.M., and R.S. Detrick, The crustal structure of the MidAtlantic Ridge at 23°N from seismic refraction studies, J. Geophys. Res., 91,3739-3762, 1986.
37. Purdy, G.M., J.C. Sempéré, H. Schouten, D.L. Dubois, and R. Goldsmith, Bathymetry of the Mid-Atlantic Ridge, 24°-31°N: A map series, Mar. Geophys. Res., 12,247-252, 1990.
38. Sandwell, D.T., Thermal stresses and spacing of transform faults, J. Geophys. Res., 91,6405-6417, 1986.
39. Sandwell, D.T., and W. Smith, Marine gravity anomaly from Geosat and ERS-1 satellite altimetry, J. Geophys. Res., 102, 10,039-10,054, 1997.
40. Schilling, J.-G., Azores mantle blob: Rare earth evidence, Earth Planet. Sci. Lett., 25,103-115, 1975.
41. Schilling, J.-G., Geochemical and isotopic variation along the MidAtlantic Ridge axis from 79°N to 0°N, in The Geology of North America, vol. M, The Western North Atlantic Region, edited by P. R. Vogt and B. E. Tucholke, pp. 137-156, Geol. Soc. Ara, Boulder, Colo., 1986.
42. Schilling, J.-G., Fluxes and excess temperatures of mantle plumes inferred from their intereaction with migrating mid-ocean ridges, Wamre, 352, 397-403,1991.
43. Schilling, J.-G., M. Zajac, R. Evans, T. Johnston, VV. White, J. Devine, and R. Kingsley, Petrologic and geochemical variations along the Mid-Atlantic Ridge from 29°N to 73°N, Am. J. Sci., 255,510-586,1983.
44. Searle, R.C., Lithospheric structure of the Azores Plateau from Rayleigh-wave dispersion, Geophys. J. R. As iron. Soc., 44,537-546, 1976.
45. Searle, R.C., Tectonic pattern of the Azores spreading center and triple junction, Earth Planet. Sci. Lett., 51,415-434, 1980.
46. Searle, R.C., and R.B. Whitmarsh, The structure of King's Trough, Northeast Atlantic, from bathymétrie, seismic and gravity studies, Geophys. J. R. Astron. Soc., 53,259-287, 1978.
47. Sinha, M.C., and K.E. Louden, The Oceanographer fracture zone, I, Crustal structure from seismic refraction studies, Geophys. J. R. Astron. Soc., 75,713-736, 1983.
48. Sinha, M.C., D.A. Navin, L.M. MacGregor, S. Constable, C. Pierce, A. White, G. Heinson, and M.A. Inglis, Evidence for accumulated melt beneath the slow-spreading Mid-Atlantic Ridge, Philos. Trans. R. Soc. London A., 355,233-253, 1997.
49. Skinner, B.J., Thermal expansion, in Handbook of Physical Constants, Mem. Geol. Soc. Am., 97,78-96, 1966.
50. Smith, W.H.F., On the accuracy of digital bathymetry data, J. Geophys. Res., 98,9,591-9,603, 1993.
51. Smith, W.H.F., and D.T. Sandwell, Bathymétrie prediction from dense satellite altimetry and sparse shipboard bathymetry, J. Geophys. Res., 99,21,803-21,824, 1994.
52. Srivastava, S.P., and C.R. Tapscott, Plate kinematic of the North Atlantic; in The Geology of North America, vol. M, The Western North Atlantic Region, edited by P. R. Vogt and B. E. Tucholke, pp. 379-404, Geol. Soc. Am., Boulder, Colo., 1986.
53. Talwani, M., J.L. Worzel, and M. Landisman, Rapid gravity computations for two-dimensional bodies with application to the Mendocino submarine fracture zone, J. Geophys. Res., 64,49-59, 1959.
54. Talwani, M., C.C. Windisch, and M.G. Langseth Jr., Reykjanes Ridge Crest: A detailed geophysical study, J. Geophys. Res., 76,473-517, 1971.
55. Tarney, J., D.A.Wood, J. Varet, A.D. Saunders, and J.R. Cann, Nature of mantle heterogeneity in the North Atlantic: Evidence from Leg 49 basalts, in: Talwani, M.; Harrison, G.G. and Hayes, D.E. (eds). Deep Drilling Results in the Atlantic Ocean: Ocean Crust, Maurice Ewing Ser., vol. 2, edited by M. Talwani, C. G. Harrison, and D. E. Hayes, pp. 285-301, AGU, Washington, D.C., 1979.
56. Taylor, R.N., M.F. Thirlwall, B.J. Murton, D.R. Hilton, and M.A.M. Gee, Isotopic constraints on the influence of the Icelandic plume, Earth Planet. Sci. Lett., 148,E1-E8, 1997.
57. Tucholke, B.E., and H. Scheuten, Kane Fracture Zone, Mar. Geophys. Res., 10,1-39, 1988.
58. Vogt, P.R., and R.K. Perry, North Atlantic Ocean: Bathymetry and plate tectonic evolution, Map and Chart Series MC-35, Geol. Soc. Am., Boulder, Colo., 1981.
59. White, R.S., Rift-plume interaction in the North Atlantic, Philos. Trans. R. Soc. London A, 355,319-339, 1997.
60. White, R.S., R.S. Detrick, J.C. Mutter, P. Buhl, T.A. Minshull, and E. Morris, New seismic images of oceanic crustal structure, Geology, 18,462-465, 1990.
61. White, W.M., and J.-G. Schilling, The nature and origin of geochemical variation in Mid-Atlantic Ridge basalts from the central North Atlantic, Geochim. Cosmochim. Acta, 42,1501-1516, 1978.
62. Won, I.J., and M. Bevis, Computing the gravitational and magnetic anomalies due to a polygon: Algorithms and Fortran subroutines, Geophysics, 52,232-238, 1987.
63. Wyllie, P.J., Plate tectonics and magma genesis, Geol. Ritndsch., 70,128-153, 1981.
64. Yu, D., D. Fontignie, and J.-G. Schilling, Mantle plume-ridge interactions in the Central North Atlantic: A Nd isotope study of the Mid-Atlantic Ridge basalts from 30°N to 50°N, Earth Planet. Sci. Lett., 146,259-212, 1997.