Morphology and genesis of slow-spreading ridges - Seabed scattering and seismic imaging within the oceanic crust

Geophysical Journal International

Volumn 168, Issue 1, 2007, Pages 59-89

  Peirce, Christine ^a   Sinha, Martin ^b   Topping, Simon ^b,c   Gill, Christopher ^a  

^a DURHAM UNIVERSITY   (United Kingdom)

^b UNIVERSITY OF SOUTHAMPTON   (United Kingdom)

^c UNIVERSITY OF CAMBRIDGE   (United Kingdom)

Author keywords

Crustal structure; Mid ocean ridges; Oceanic crust; Seismic structure

Indexed keywords

CRUSTAL STRUCTURE; FAULTING; IMAGING METHOD; MID-OCEAN RIDGE; MORPHOLOGY; OCEANIC CRUST; PETROGENESIS; SEAFLOOR; SEISMIC METHOD; SEISMIC REFLECTION;

ATLANTIC OCEAN; MID-ATLANTIC RIDGE;

EID: 33845995453     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2006.03223.x     Document Type: Article

References (101)

1. Anderson, R.N. et al., 1982. DSDP hole 504B, the first reference section over 1 km through layer 2 of the oceanic crust, Nature, 300, 589-594.
2. Applegate, B. & Shor, A.N., 1994. The northern Mid-Atlantic and Reykjanes Ridges: Spreading centre morphology between 55° 50′N and 63° 00′N, J. geophys. Res., 99, 17935-17956.
3. Auzende, J.-M. et al., 1996. Recent tectonic, magmatic and hydrothermal activity on the East Pacific Rise between 17°S and 19°S: submersible observations, J. geophys. Res., 101, 17995-18010.
4. Barclay, A.H., Toomey, D.R. & Solomon, S.C., 1998. Seismic structure and crustal magmatism at the Mid-Atlantic Ridge, 35°N, J. geophys. Res., 103, 17827-17844.
5. s structure at the Mid-Atlantic Ridge, 35°N, J. geophys. Res., 103, 17827-17844.
6. Bazin, S. et al., 2001. Three-dimensional shallow crustal emplacement at the 9°03' overlapping spreading centre on the East Pacific Rise: correlations between magnetization and tomographic images, J. geophys. Res., 106, 16101-16117.
7. Becker, K. et al., 1989. Drilling deep into young oceanic crust, Hole 504B, Costa Rica Rift, Rev. Geophys., 27, 79-102.
8. Blacic, T.M., Ito, G., Canales, J.P., Detrick, R.S. & Sinton, J., 2004. Constructing the crust along the Galapagos spreading centre 91.3°-95.5°W: Correlation of seismic layer 2A with axail magma lens and topographic characteristics, J. geophys. Res., 109, B10310, doi:.
9. Burnett, M.S., Caress, D.W. & Orcutt, J.A., 1989. Tomographic image of the magma chamber at 12°50′N on the East Pacific Rise, Nature, 339, 206-208.
10. Calvert, A.J., 1995. Seismic evidence for a magma chamber beneath the slow-spreading Mid-Atlantic Ridge, Nature, 377, 410-414.
11. Calvert, A.J., 1997. Backscattered coherent noise and seismic reflection imaging of the oceanic crust: An example from the rift valley of the Mid-Atlantic Ridge at 23°N, J. geophys. Res., 102, 5119-5133.
12. Canales, J.P. & Detrick, R.S., 1998. Segment-scale crustal structure variations within the rift mountains of the Mid-Atlantic Ridge (35°N), Ann. Geophys., 16(1), 292.
13. Cao, S.H. & Kennett, B.L.N., 1989. Reflection seismograms in a 3-D elastic model: An isochronal approach, Geophys. J. Int., 99(1), 63-80.
14. Carbotte, S.M. & Macdonald, K.C., 1990. Causes of variation in fault-facing direction on the ocean floor, Geology, 18, 749-752.
15. Carbotte, S.M., Mutter, J.C. & Xu, L., 1997. Contribution of volcanism and tectonism to axial flank morphology of the southern East Pacific Rise, 17° 10′-17° 40′S, from a study of layer 2A geometry, J. geophys. Res., 102, 10165-10184.
16. Caress, D.W., Burnett, M.S. & Orcutt, J.A., 1992. Tomographic image of the axial low-velocity zone at 12°50′N on the East Pacific Rise, J. geophys. Res., 97, 9243-9263.
17. Christeson, G.L., Purdy, G.M. & Fryer, G.J., 1992. Structure of young upper crust at the East Pacific Rise at 9′30°N, Geophys. Res. Lett., 19, 1045-1048.
18. Christeson, G.L., Kent, G.M., Purdy, G.M. & Detrick, R.S., 1996. Extrusive thickness variability at the East Pacific Rise, 9°-10°N: Constraints from seismic techniques, J. geophys. Res., 101, 2859-2973.
19. Collier, J.S. & Sinha, M.C., 1990. Seismic images of a magma chamber beneath the Lau Basin back-arc spreading centre, Nature, 346, 646-648.
20. Collier, J.S. & Sinha, M.C., 1992a. The Valu Fa Ridge: The pattern of volcanic activity at a back-arc spreading centre, Marine Geology, 104, 243-263.
21. Collier, J.S. & Sinha, M.C., 1992b. Seismic mapping of a magma chamber beneath the Valu Fa Ridge, Lau Basin, J. geophys. Res., 97, 14031-14053.
22. Collins, J.A., Brocher, T.M. & Purdy, G.M., 1998. Seismic reflection structure of the upper oceanic crust: Implications from DSDP/ODP hole 504B, Panama Basin, Proceedings of the Ocean Drilling Programme, Scientific Results, 111, 117-191.
23. Cudrack, C.F. & Clowes, R.M., 1993. Crustal structure of Endeavour Ridge Segment, Juan de Fuca Ridge, from detailed seismic refraction survey, J. geophys. Res., 98, 6329-6349.
24. Day, A.J., Peirce, C. & Sinha, M.C., 2001. Three-dimensional crustal structure and magma chamber geometry at the intermediate-spreading, back-arc Valu Fa Ridge, Lau Basin - results of a wide-angle seismic tomographic inversion, Geophys. J. Int., 146, 31-52.
25. Detrick, R.S., Buhl, P., Vera, E.E., Mutter, J.A., Orcutt, J.A., Madsen, J. & Brocher, T., 1987. Multichannel seismic imaging of a crustal magma chamber along the East Pacific Rise, Nature, 326, 35-41.
26. Detrick, R.S., Mutter, J.C., Buhl, P. & Kim, I.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.
27. Detrick, R.S., Harding, A.J., Kent, G.M., Orcutt, J.A., Mutter, J.C. & Buhl, P., 1993. Seismic structure of the southern East Pacific Rise, Science, 259, 499-503.
28. Detrick, R.S., Collins, J., Stephen, R. & Swift, S., 1994. In situ evidence for the nature of the seismic layer 2/3 boundary in oceanic crust, Nature, 370, 288-290.
29. Detrick, R.S. et al., 1997. Mid-Atlantic Ridge bullseye experiment: A seismic investigation of segment-scale crustal heterogeneity at a slow-spreading ridge, InterRidge News, 6(1), 27-32.
30. Dunn, R.A., Toomey, D.R. & Solomon, S.C., 2000. Three-dimensional seismic structure and physical properties of the crust and shallow mantle beneath the East Pacific Rise at 9° 30′N, J. geophys. Res., 105, 23537-23555.
31. Dunn, R.A., Lekić, V., Detrick, R.S. & Toomey, D.R., 2005. Three-dimensional seismic structure of the Mid-Atlantic Ridge (35°N): Evidence for focused melt supply and lower crustal dyke injection, J. geophys. Res., 110, doi:.
32. Escartin, J. & Lin, J., 1995. Ridge offsets, normal faulting, and gravity anomalies of slow spreading ridges, J. geophys. Res., 100, 6163-6177.
33. Escartin, J., Cowie, P.A., Searle, R.C., Allerton, S., Mitchell, N.C., MacLeod, C.J. & Slootweg, A.P., 1999. Quantifying tectonic strain and magmatic accretion at a slow spreading ridge segment, Mid-Atlantic Ridge, 29 degrees N, J. geophys. Res., 104, 10421-10437.
34. Francheteau, J., Armijo, R., Cheminée, J.L., Hékinian, R., Lonsdale, P. & Blum, N., 1992. Dyke complex of the East Pacific Rise exposed in the walls of the Hess Deep and the structure of the upper oceanic crust, Earth planet. Sci. Lett., 111, 109-121.
35. Fuchs, K. & Müller, G., 1971. Computation of synthetic seismograms with the reflectivity method and comparison with observations, Geophys. J. R. astr. Soc., 23, 417-433.
36. Gardiner, A.B., 2003. Segmentation and cycles of crustal accretion at mid-ocean ridges: A study of the Reykjanes Ridge, unpublished PhD thesis, University of Durham, p. 177.
37. Greer, A., Sinha, M.C. & MacGregor, L.M., 2002. Joint effective medium modelling for co-incident seismic and electromagnetic data, its application to studies of porosity structure at mid-ocean ridge crests, Lithos Science Report, 4, 103-120.
38. Grevemeyer, I., Kaul, N., Villinger, H. & Weigel, W., 1997. Hydrothermal circulation and the seismic structure of upper oceanic crust: Results from the EXCO cruise, InterRidge News, 6, 27-30.
39. Harding, A.J., Orcutt, J.A., Kappus, M.E., Vera, E.E., Mutter, J.C., Buhl, P., Detrick, R.S. & Brocher, T., 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.
40. Harding, A.J., Kent, G.M. & Orcutt, J.A., 1993. A multichannel seismic investigation of upper crustal structure at 9°N on the East Pacific Rise: Implications for crustal accretion, J. geophys. Res., 98, 13925-13944.
41. Heinson, G.S., Constable, S.C. & White, A., 2000. Episodic melt transport at a mid-ocean ridge inferred from magnetotelluric sounding, Geophys. Res. Letts., 27(15), 2317-2320.
42. Hilterman, F.J., 1970. Three-dimensional seismic modelling, Geophysics, 35(6), 1020-1037.
43. Hobbs, R.W., Tong, C.H. & Pye, J.W., 2003. Modelling and processing of 3-D seismic data collected over the overlapping spreading centre on the East Pacific Rise at 903N, Special Publication of the Geological Society of London, 212, 251-259.
44. Hooft, E.E.E., Schouten, H. & Detrick, R.S., 1996. Constraining crustal emplacement processes from the variation in seismic layer 2A thickness at the East Pacific Rise, Earth planet. Sci. Lett., 142, 289-309.
45. Hooft, E.E.E., Detrick, R.S. & Kent, G.M., 1997. Seismic structure and indicators of magma budget along the southern East Pacific Rise, J. geophys. Res., 102, 27319-27340.
46. Hussenoeder, S.A., Collins, J.A., Kent, G.M. & Detrick, R.S., 1996. Seismic analysis of the axial magma chamber reflector along the southern East Pacific Rise from conventional reflection profiling, J. geophys. Res., 101, 22087-22105.
47. Hussenoeder, S.A., Detrick, R.S., Kent, G.M., Schouten, H. & Harding, A.J., 2002a. Fine-scale seismic structure of young upper crust at 17°20′S on the fast spreading East Pacific Rise, J. geophys. Res., 107, doi:, EPM 2.
48. Hussenoeder, S.A., Kent, G.M. & Detrick, R.S., 2002b. Upper crustal seismic structure of the slow spreading Mid-Atlantic Ridge, 35°N: constraints on volcanic emplacement processes, J. geophys. Res., 107, doi:, EPM 1.
49. Kappus, M.E., Harding, A.J. & Orcutt, J.A., 1995. A baseline for upper crustal velocity variations along the East Pacific Rise at 13°N, J. geophys. Res., 100, 6143-6161.
50. Keeton, J.A., Searle, R.C., Parsons, B., White, R.S., Murton, B.J., Parson, L.M., Peirce, C. & Sinha, M.C., 1997. Bathymetry of the Reykjanes Ridge, Marine geophys. Res., 19, 55-64.
51. Kent, G.M., Harding, A.J. & Orcutt, J.A., 1990. Evidence for a smaller magma chamber beneath the East Pacific Rise at 9°30′N, Nature, 344, 650-653.
52. Kent, G.M., Harding, A.J. & Orcutt, J.A., 1993a. Distribution of magma beneath the East Pacific Rise between the Clipperton transform and the 9°17′N deval from forward modelling of common depth point data, J. geophys. Res., 98, 13945-13969.
53. Kent, G.M., Harding, A.J. & Orcutt, J.A., 1993b. Distribution of magma beneath the East Pacific Rise near the 9°03′N overlapping spreading centre from forward modelling of common depth point data, J. geophys. Res., 98, 13971-13996.
54. Kent, G.M., Harding, A.J., Orcutt, J.A., Detrick, R.S., Mutter, J.C. & Buhl, P., 1994. Uniform accretion of oceanic crust south of the Garrett transform at 14° 15′S on the East Pacific Rise, J. geophys. Res., 99, 9097-9116.
55. Kent, G.M., Kim, I.I., Harding, A.J., Detrick, R.S., Orcutt, J.A., 1996. Suppression of seafloor scattered energy using a dip move-out approach - application to the mid-ocean ridge environment, Geophysics, 61(3), 821-834.
56. Kent, G.M. et al., 2000. Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean ridge discontinuities, Nature, 406, 614-618.
57. Kong, L.S.L., Solomon, S.C. & Purdy, G.M., 1992. Microearthquake characteristics of a mid-ocean ridge along axis high, J. geophys. Res., 97, 1659-1685.
58. Langmuir, C.H., Bender, J.F. & Batiza, R., 1986. Petrological and tectonic segmentation of the East Pacific Rise 5°30′N-14°30′N, Nature, 322, 422-429.
59. Lee, S.-M. & Searle, R.C., 2000. Crustal magnetisation of the Reykjanes Ridge and implications for its along-axis variability and the formation of axial volcanic ridges, J. geophys. Res., 105, 5907-5930.
60. Macdonald, K.C., 1982. Mid-ocean ridges: Fine-scale tectonic, volcanic and hydrothermal processes within the plate boundary zone, Ann. Rev. Earth Planet. Sci., 10, 155-190.
61. Macdonald, K.C., Sempere, J. & Fox, P.J., 1984. East Pacific Rise from Siqueiros to Orinoco FZ: Along strike continuity of axial neovolcanic zone and structure and evolution of overlapping spreading centres, J. geophys. Res., 87, 6049-6069.
62. Macdonald, K.C. et al., 1988. A new view of the mid-ocean ridge from the behaviour of ridge-axis discontinuities, Nature, 335, 217-225.
63. MacGregor, L.M., 1997. Electromagnetic investigation of the Reykjanes Ridge near 58°N, unpublished PhD thesis, University of Cambridge, p. 264.
64. MacGregor, L.M., Constable, S. & Sinha, M.C., 1998. The RAMESSES experiment III: Controlled-source electromagnetic sounding of the Reykjanes Ridge at 57° 45′N, Geophys. J. Int., 135, 772-789.
65. Minshull, T.A., White, R.S., Mutter, J.C., Buhl, P., Detrick, R.S., Williams, C.A. & Morris, E., 1991. Crustal structure at the Blake Spur Fracture zone from expanding spread profiles, J. geophys. Res., 96, 9955-9984.
66. Murton, B.J. & Parson, L.M., 1993. Segmentation, volcanism and deformation of oblique spreading centres: A qualitative study of the Reykjanes Ridge, Tectonophysics, 222, 237-257.
67. Mutter, J.C. et al., 1995. Seismic images of active magma systems beneath the East Pacific Rise between 17° 05′ and 17° 35′S, Science, 268, 391-395.
68. Navin, D.A., 1996. Seismic investigation of crustal accretion at the slow spreading Mid-Atlantic Ridge - the Reykjanes Ridge at 57°45′N, unpublished PhD thesis, University of Durham, pp. 309.
69. Navin, D.A., Peirce, C. & Sinha, M.C., 1998. The RAMESSES experiment - II. Evidence for accumulated melt beneath slow spreading ridge from wide-angle refraction and multichannel reflection seismic profiles, Geophys. J. Int., 135, 746-772.
70. Parmentier, E.M. & Phipps Morgan, J., 1990. Spreading rate dependence of 3-dimensional structure in oceanic spreading centres, Nature, 348, 325-328.
71. Parson, L.M. et al., 1993. En echelon axial volcanic ridges at the Reykjanes Ridge: A life cycle of volcanism and tectonics, Earth planet. Sci. Lett., 117, 73-87.
72. Peirce, C. & Navin, D.A., 2002. The RAMESSES experiment - V. Crustal accretion at axial volcanic segments - a gravity study at 57°45′N on the slow-spreading Reykjanes Ridge, Geophys. J. Int., 148, 1-19.
73. Peirce, C. & Sinha, M.C., 1998. RAMESSES II -Reykjanes Ridge axial melt experiment: Structural synthesis from electromagnetics and seismic, RRS Discovery 235c Cruise Report, unpublished, p. 38.
74. Peirce, C., Turner, I.M. & Sinha, M.C., 2001. Crustal structure, accretionary processes and rift propagation: A gravity study of the intermediate-spreading Valu Fa Ridge, Lau Basin, Geophys. J. Int., 146, 53-73.
75. Peirce, C., Gardiner, A. & Sinha, M.C., 2005. Temporal and spatial cyclicity of accretion at slow-spreading ridges - evidence from the Reykjanes Ridge, Geophys. J. Int., 163, 56-78.
76. Reston, T.J., Ranero, C.R., Ruoff, O., Perez-Gussinye, M. & Dañobeitia, J.J., 2004. Geometry of extensional faults developed at slow-spreading centres from pre-stack depth migration of seismic reflection data in the Central Atlantic (Canary Basin), Geophys. J. Int., 159, 591-606.
77. Rohr, K.M.M., Milkereit, B. & Yorath, C.J., 1988. Asymmetric deep crustal structure across the Juan de Fuca Ridge, Geology, 16, 533-537.
78. Sandwell, D.T. & Smith, W.H.F., 1997. Marine gravity anomaly from Geosat and ERS-1 satellite Altimetry, J. geophys. Res., 102, 10039-10054.
79. 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, 24159-24172.
80. Searle, R.C., Keeton, J.A., Owens, R.B., White, R.S., Mecklenburgh, R., Parsons, B. & Lee, S.-M., 1998. The Reykjanes Ridge: Structure and tectonics of a hot-spot influenced, slow-spreading ridge, from multibeam bathymetry, gravity and magnetic investigations, Earth planet. Sci. Lett., 160, 463-478.
81. Shaw, P.R. & Lin, J., 1993. Causes and consequences of variations in faulting style at the Mid-Atlantic Ridge, J. geophys. Res., 98, 21839-21851.
82. Sinha, M.C., Peirce, C. & Constable, S., 1994. An integrated geophysical investigation of the axial volcanic region of the Reykjanes Ridge at 57°45′N, RRS Charles Darwin 81 Cruise report, unpublished, p. 39.
83. Sinha, M.C., Navin, D.A., MacGregor, L.M., Constable, S., Peirce, C., White, A., Heinson, G. & Inglis, M.A., 1997. Evidence for accumulated melt beneath the slow-spreading Mid-Atlantic Ridge, Phil. Trans. R. Soc. Lond., A, 355, 233-253.
84. Sinha, M.C., Constable, S., Peirce, C., White, A., Heinson, G., MacGregor, L.M. & Navin, D.A., 1998. Magmatic processes at slow spreading ridges: Implications of the RAMESSES experiment, Mid-Atlantic Ridge at 57°N, Geophys. J. Int., 135, 731-745.
85. Sinton, J.M., Smaglik, S.M., Mahoney, J.J. & Macdonald, K.C., 1991. Magmatic processes at superfast spreading mid-ocean ridges: Glass compositional variations along the East Pacific Rise 13°-23°S, J. geophys. Res., 96, 6133-6155.
86. Smallwood, J.R. & White, R.S., 1998. Crustal accretion at the Reykjanes Ridge, 61°-62°N, J. geophys. Res., 103, 5185-5201.
87. Sohn, R.A., Webb, S.C. & Hildebrand, J.A., 2004. Fine-scale seismic structure of the shallow volcanic crust on the East Pacific Rise at 9°50′N, J. geophys. Res., 109, B12104, doi:.
88. Taylor, R.N., Murton, B.J. & Thirwall, M.F., 1995. Petrographic and geochemical variation along the Reykjanes Ridge, 57°N-59°N, J. geol. Soc. Lond., 152, 1031-1037.
89. Tong, C.H. et al., 2002. Asymmetric melt sills and upper crustal construction beneath overlapping ridge segments: Implications for the development of melt sills and ridge crests, Geology, 30(1), 83-86.
90. Toomey, D.R., Purdy, G.M., Solomon, S.C. & Wilcock, W.S.D., 1990. The three-dimensional seismic velocity structure of the East Pacific Rise near latitude 9°30′N, Nature, 347, 639-645.
91. Toomey, D.R., Solomon, S.C. & Purdy, G.M., 1994. Tomographic imaging of the shallow crustal structure of the East Pacific Rise at 9°30′N, J. geophys. Res., 99, 24135-24157.
92. Topping, S., 2002. RAMESSES II: Seismic reflections at the Mid-Atlantic Ridge from analysis of real and synthetic data, unpublished PhD thesis, University of Cambridge, p. 196.
93. Trorey, A.W., 1970. A simple theory for seismic diffractions, Geophysics, 35(5), 762-784.
94. Turner, I.M., Peirce, C. & Sinha, M.C., 1999. Seismic imaging of the axial region of the Valu Fa Ridge, Lau Basin - the accretionary processes of an intermediate back-arc spreading ridge, Geophys. J. Int., 138, 495-519.
95. Vera, E.E. & Diebold, J.B., 1994. Seismic imaging of oceanic layer 2A between 9°30′N and 10°N on the East Pacific Rise from two-ship wide-aperture profiles, J. geophys. Res., 99, 3031-3041.
96. Vera, E.E., Mutter, J.C., Buhl, P., Orcutt, J.A., Harding, A.J., Kappus, M.E., Detrick, R.S. & Brocher, T.M., 1990. The structure of 0 to 0.2 Ma old oceanic crust at 9°N on the East Pacific Rise from expanded spread profiles, J. geophys. Res., 95, 15529-15556.
97. Wessel, P. & Smith, W.H.F., 1995. New version of the Generic Mapping Tools released, EOS, Trans. Am. geophys. Un., 76, 329.
98. White, D.J. & Clowes, R.M., 1990. Shallow crustal structure beneath the Juan de Fuca Ridge from 2-D seismic refraction tomography, Geophys. J. Int., 100, 349-367.
99. Wilcock, W.S.D., Solomon, S.C., Toomey, D.R. & Purdy, G.M., 1992. The seismic attenuation structure of a fast spreading mid-ocean ridge, Science, 258, 1470-1473.
100. Wild, A.J. & Hudson, J.A., 1998. A geometrical approach to the elastic complex screen, J. geophys. Res., 103, 707-725.
101. Wild, A.J., Hobbs, R.W. & Frenje, L., 2000. Modelling complex media: an introduction to the phase-screen method, Phys. Earth planet Inter., 120, 219-225.