Evidence for accumulated melt beneath the slow-spreading Mid-Atlantic Ridge

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

Volumn 355, Issue 1723, 1997, Pages 233-253

  Sinha, M C ^a   Navin, D A ^b   Macgregor, L M ^a   Constable, S ^c   Peirce, C ^b   White, A ^d   Heinson, G ^d   Inglis, M A ^b  

^a UNIVERSITY OF CAMBRIDGE   (United Kingdom)

^b DURHAM UNIVERSITY   (United Kingdom)

^c UNIVERSITY OF CALIFORNIA   (United States)

^d FLINDERS UNIVERSITY   (Australia)

Author keywords

[No Author keywords available]

Indexed keywords

AXIAL MAGMA CHAMBER; ELECTROMAGNETIC SOUNDING; MAGMA CHAMBERS; MAGNETOTELLURIC SOUNDING; SEISMIC SURVEY; SEISMIC SURVEYS;

ATLANTIC, MID-ATLANTIC RIDGE;

EID: 0030819193     PISSN: 1364503X     EISSN: None     Source Type: Journal    
DOI: 10.1098/rsta.1997.0008     Document Type: Article

References (47)

1. Bunch, A. W. H. & Kennett, B. L. N. 1980 The crustal structure of the Reykjanes Ridge at 59° 30′ N. Geophys. Jl R. Astr. Soc. 61, 141-146.
2. Calvert, A. J. 1995 Seismic evidence for a magma chamber beneath the slow-spreading Mid-Atlantic Ridge. Nature 377, 410-414.
3. Chapman, C. H. & Drummond, R. 1982 Body wave seismograms in inhomogeneous media using Maslov asymptotic ray theory. Bull. Seism. Soc. Am. 72, S277-S317.
4. Chave, A. D. & Cox, C. S. 1982 Controlled electromagnetic sources for measuring electrical conductivity beneath the oceans. 1. Forward problem and model study. J. Geophys. Res. 87, 5327-5388.
5. Chave, A. D., Flosadottir, A. H. & Cox, C. S. 1990. Some comments on the seabed propagation of ULF/ELF electromagnetic fields. Radio Science 25, 825-836.
6. Chen, Y. & Morgan, W. J. 1990 Rift valley/no rift valley transition at mid-ocean ridges. J. Geophys. Res. 95, 17571-17581.
7. Collier, J. S. & Sinha, M. C. 1992 Seismic mapping of a magma chamber beneath the Valu Fa Ridge, Lau Basin. J. Geophys. Res. 97, 14031-14053.
8. Constable, S. C., Parker, R. L. & Constable, C. G. 1987 Occam's inversion: a practical algorithm for generating smooth models from electromagnetic sounding data. Geophysics 52, 289-300.
9. Detrick, R. S., Buhl, P., Vera, E., Mutter, J., Orcutt, J., Madsen, J. & Brocher, T. 1987 Multichannel seismic imaging of a crustal magma chamber along the East Pacific Rise. Nature 326, 35-42.
10. Detrick, R. S., Mutter, J. C., Buhl, P. & Kim, I. 1990 No evidence from multichannel reflection data for a crustal magma chamber in the MARK area on the Mid-Atlantic Ridge. Nature 347, 61-64.
11. Detrick, R. S., Harding, A. J., Kent, G. M., Orcutt, J. A., Mutter, J. C. & Buhl, P. 1993a Seismic structure of the southern East Pacific Rise. Science 259, 499-503.
12. Detrick, R. S., White, R. S. & Purdy, G. M. 1993b Crustal structure of North Atlantic fracture zones. Seismic structure of the southern East Pacific Rise. Rev. Geophys. 31, 439-458.
13. Evans, R. L. & Everett, M. E. 1992 Magneto-tellurics and mid-ocean ridge melt transport: a two-dimensional perspective. In Mantle flow and melt generation at Mid-Ocean Ridges (ed. J. Phipps Morgan, D. K. Blackman & J. M. Sinton), pp. 353-361. (Geophysical Monograph 71.) Washington, DC: AGU.
14. Evans, R. L., Sinha, M. C., Constable, S. C. & Unsworth, M. J. 1994 On the electrical nature of the axial melt zone at 13° N on the East Pacific Rise. J. Geophys. Res. 99, 577-588.
15. Egbert, G. D. & Booker, J. R. 1986 Robust estimation of geomagnetic transfer functions. Jl R. Astr. Soc. 87, 173-194.
16. Fowler, C. M. R. 1976 Crustal structure of the Mid-Atlantic Ridge crest at 37° N. Geophys. Jl R. Astr. Soc. 47, 459-491.
17. Fowler, C. M. R. & Keen, C. E. 1979 Oceanic crustal structure - Mid-Atlantic Ridge crest at 45° N. Geophys. Jl R. Astr. Soc. 56, 219-226.
18. German, C. R. et al. (11 authors) 1994 Hydrothermal activity on the Reykjanes Ridge: the Steinaholl vent-field at 63° 06′ N. Earth Planet. Sci. Lett. 121, 647-654.
19. Harding, A. J., Orcutt, J. A., Kappus, M. E., Vera, E. E., Mutter, J. C., Buhl, P., Detrick, R. S. & Brocher, T. M. 1989 The structure of young oceanic crust at 13° N on the East Pacific Rise from expanding spread profiles. J. Geophys. Res. 94, 12163-12196.
20. Heinson, G. S. & Constable, S. C. 1992 The electrical conductivity of the oceanic upper mantle, Geophys. J. Int. 110, 159-179.
21. Henstock, T. J., Woods, A. W. & White, R. S. 1993 The accretion of oceanic crust by episodic sill intrusion. J. Geophys. Res. 98, 4143-4161.
22. Keeton J. A., Searle, R. C., Parsons, B., White, R. S., Murton, B. J., Parson, L. M., Peirce C. & Sinha, M. 1997 Bathymetry of the Reaykjanes Ridge. Mar. Geophys. Res. (In the press.)
23. Kusznir, N. J. & Bott, M. H. P. 1976 A thermal study of the formation of oceanic crust. Geophys. Jl R. Astr. Soc. 47, 83-95.
24. Lilley, F. E. M. 1995 Strike direction: obtained from basic models for 3D magnetotelluric data. In Three-dimensional electromagnetics (ed. M. Oristaglio & B. Spies), pp. 359-369. Ridgefield, CT: Schlumberger-Doll Research.
25. MacGregor, L. M. & Sinha, M. C. 1996 Marine controlled-source EM: effect of source-receiver geometry on the response of 1-D structures. Submitted to Geophys. J. Int. (Submitted).
26. McKenzie, D. P. & Bickle, M. J. 1988 The volume and composition of melt generated by extension of the lithosphere. J. Petrol 29, 625-675.
27. Murton, B. J. & Parson, L. M. 1993 Segmentation, volcanism and deformation of oblique spreading centres: a quantitative study of the Reykjanes Ridge. Tectonophysics 222, 237-257.
28. Navin, D. A., Peirce, C. & Sinha, M. C. 1996 Seismic evidence for a crustal magma chamber beneath the slow-spreading Reykjanes Ridge. JA G Newsletter 7, 20.
29. Parson, L. M. et al. (17 authors) 1993. En echelon axial volcanic ridges at the Reykjanes Ridge: a life cycle of volcanism and tectonics. Earth Planet. Sci. Lett. 117, 73-87.
30. Phipps Morgan, J. & Chen, Y. J. 1993 The genesis of oceanic crust: magma injection, hydrothermal circulation, and crustal flow. J. Geopys. Res. 98, 6283-6297.
31. Purdy, G. M. & Detrick, R. S. 1986 Crustal structure of the Mid-Atlantic Ridge at 23° N from seismic refraction studies. J. Geophys. Res. 91, 3739-3762.
32. Schilling, J. G., Zajac, M., Evans, R., Johnston, T., White, W., Devine, J. D. & Kingsley, R. 1983 Petrologic and geochemical variations along the Mid-Atlantic Ridge from 29° N to 73° N. Am. J. Sci. 283, 510-586.
33. Sleep, N. H. 1975 Formation of oceanic crust: some thermal constraints. J. Geophys. Res. 80, 4037-4042.
34. Searle, R. C. & Laughton, A. S. 1981 Fine scale sonar study of tectonics and volcanism on the Reykjanes Ridge. Oceanol. Acta 4, 5-13.
35. Searle, R. C., Field, P. R. & Owens, R. B. 1994 Segmentation and a non-transform ridge offset on the Reykjanes Ridge near 58° N. J. Geophys. Res. 99, 24 159-24 172.
36. Sinha, M. C. & Louden, K. E. 1983 The oceanographer fracture zone. I. Crustal structure from seismic refraction studies. Geophys. Jl R. Astr. Soc. 75, 713-736.
37. Sinha, M. C., Patel, P. D., Unsworth, M. J., Owen, T. R. E. & MacCormack, M. R. G. 1990 An active source electromagnetic sounding system for marine use. Mar. Geophys. Res. 12, 59-68.
38. Sinha, M., Peirce, C., Constable, S. & White, A. 1994 An integrated geophysical investigation of the axial volcanic region of the Reykjanes Ridge at 57° 45′ N-RRS. Charles Darwin 81 Cruise Report, p. 39. University of Cambridge.
39. Sinton, J. M. & Detrick, R. S. 1992 Mid-ocean ridge magma chambers. J. Geophys. Res. 97, 197-216.
40. Smallwood, J. R., White, R. S. & Minshull, T. A. 1995 Sea-floor spreading in the presence of the Iceland plume: the structure of the Reykjanes Ridge at 61° 40′ N. J. Geol. Soc. 152, 1023-1029.
41. Tyburczy, J. A. & Waff, H. S. 1983 Electrical conductivity of molten basalt and andesite to 25 kilobars pressure: geophysical significance and implications for charge transport and melt structure. J. Geophys. Res. 88, 2413-2430.
42. Unsworth, M. J. 1991 Electromagnetic exploration of the oceanic crust with controlled sources. Ph.D. thesis, University of Cambridge.
43. Unsworth, M. J., Travis, B. J. & Chave, A. D. 1993 Electromagnetic induction by a finite electric dipole source over a two-dimensional Earth. Geophysics 58, 198-214.
44. Vera, E. E., Mutter, J. C., Buhl, P., Orcutt, J. A., Harding, A. J., Kappus, M. E., Detrick, R. S. & Brocher, T. M. 1990 Structure of 0- to 0.2-m.y. old oceanic crust at 9° N on the East Pacific Rise from expanded spread profiles. J. Geophys. Res. 95, 15529-15556.
45. Wannamaker, P. E., Stodt, J. A. & Rijo, L. 1986 A stable finite element solution for two-dimensional magnetotelluric modelling, Geophys. Jl R. Astr. Soc. 88, 277-296.
46. Webb, S. C., Constable, S. C., Cox, C. S. & Deaton, T. K. 1985 A sea-floor electric field instrument. J. Geomagn. Geoelect. 37, 1115-1130.
47. White, R. S., McKenzie, D. & O'Nions, R. K. 1992 Oceanic crustal thickness from seismic measurements and rare earth element inversions. J. Geophys. Res. 97, 19683-19715.