Along- and across-axis variations in crustal thickness and structure at the Mid-Atlantic Ridge at 5°S obtained from wide-angle seismic tomography: Implications for ridge segmentation

Journal of Geophysical Research: Solid Earth

Volumn 114, Issue 9, 2009, Pages

  Planert, Lars ^a   Flueh, Ernst R ^a   Reston, Timothy J ^b  

^a GEOMAR HELMHOLTZ CENTRE FOR OCEAN RESEARCH KIEL   (Germany)

^b UNIVERSITY OF BIRMINGHAM   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ACCRETION; CRUSTAL THICKENING; CRUSTAL THICKNESS; CRUSTAL THINNING; FRACTURE ZONE; HYDROTHERMAL ACTIVITY; LAVA FLOW; PARTIAL MELTING; SEAFLOOR; SEAFLOOR SPREADING; SEISMIC REFLECTION; SEISMIC REFRACTION; SEISMIC TOMOGRAPHY; SERPENTINIZATION; TRANSFORM FAULT;

ATLANTIC OCEAN; MID-ATLANTIC RIDGE;

EID: 72049099029     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/2008JB006103     Document Type: Article

References (66)

1. Abrams, L. J., R. S. Detrick, and P. J. Fox (1988), Morphology and crustal structure of the Kane Fracture Zone transverse ridge, J. Geophys. Res., 93, 3195-3210, doi:10.1029/JB093iB04p03195.
2. Berryhill, J. R. (1979), Wave-equation datuming, Geophysics, 44, 1329-1344, doi:10.1190/1.1441010.
3. Bickel, S. H. (1990), Velocity-depth ambiguity of reflection traveltimes, Geophysics, 55, 266-276, doi:10.1190/1.1442834.
4. Blackman, D. K., J. R. Cann, B. Janssen, and D. K. Smith (1998), Origin of extensional core complexes: Evidence from the Mid-Atlantic Ridge at Atlantis Fracture Zone, J. Geophys. Res., 103, 21,315-21,333, doi:10.1029/98JB01756.
5. Blackman, D. K., B. Ildefons, B. E. John, Y. Ohara, D. J. Miller, C. J. MacLeod, and Expedition 304/305 Scientists (2006), Proceedings of the Integrated Ocean Drilling Program, vol.304/305, Integrated Ocean Drill. Program, College Station, Tex., doi:10.2204/iodp.proc.304305.2006.
6. Calvert, A. J. (1995), Seismic evidence for a magma chamber beneath the slow-spreading Mid-Atlantic Ridge, Nature, 377, 410-414, doi:10.1038/377410a0.
7. Canales, J. P., R. S. D. J. Lin, and J. A. Collins (2000a), Crustal and upper mantle seismic structure beneath the rift mountains and across a nontransform offset at the Mid-Atlantic Ridge (35°N), J. Geophys. Res., 105, 2699-2719, doi:10.1029/1999JB900379.
8. Canales, J. P., J. A. Collins, J. Escartin, and R. S. Detrick (2000b), Seismic structure across the rift valley of the Mid-Atlantic Ridge at 23°20' (MARK area): Implications for crustal accretion processes at slow spreading ridges, J. Geophys. Res., 105, 28,411-28,425, doi:10.1029/2000JB900301.
9. Canales, J. P., R. A. Sohn, and B. deMartin (2007), Crustal structure of the Trans-Atlantic Geotraverse (TAG) segment (Mid-Atlantic Ridge, 26°10'N): Implications for the nature of hydrothermal circulation and detachment faulting at slow spreading ridges, Geochem. Geophys. Geosyst., 8, Q08004, doi:10.1029/2007GC001629.
10. Canales, J. P., B. E. Tucholke, M. Xu, J. A. Collins, and D. L. DuBois (2008), Seismic evidence for large-scale compositional heterogeneity of oceanic core complexes, Geochem. Geophys. Geosyst., 9, Q08002, doi:10.1029/2008GC002009.
11. Cann, J. R., D. K. Blackman, D. K. Smith, E. McAllister, B. Janssen, S. Mello, E. Avgerinos, A. Pascoe, and J. Escartin (1997), Corrugated slip surfaces formed at North Atlantic ridge-transform intersections, Nature, 385, 329-332, doi:10.1038/385329a0. (Pubitemid 27053100)
12. Cannat, M. (1995), Thin crust, ultramafic exposures, and rugged faulting patterns at the Mid-Atlantic Ridge (22°-24°N), Geology, 23, 49-52, doi:10.1130/0091-7613(1995)023〈0049:TCUEAR〉2.3.CO;2.
13. Carlson, R. L., and D. J. Miller (2003), Mantle wedge water contents estimated from seismic velocities in partially serpentinized peridotites, Geophys. Res. Lett., 30(5), 1250, doi:10.1029/2002GL016600.
14. Christensen, N. I. (1979), Compressional wave velocities in rocks at high in temperatures and pressures, critical thermal gradients and crustal low-velocity zones, J. Geophys. Res., 84, 6849-6857, doi:10.1029/ JB084iB12p06849.
15. deMartin, B. J., R. A. Sohn, J. P. Canales, and S. E. Humphris (2007), Kinematics and geometry of active detachment faulting beneath the Trans-Atlantic Geotraverse (TAG) hydrothermal field on the Mid-Atlantic Ridge, Geology, 35, 711-714, doi:10.1130/G23718A.1.
16. DeMets, C., R. Gordon, D. F. Argus, and S. Stein (1990), Current plate motions, Geophys. J. Int., 101, 425-478, doi:10.1111/j.1365-246X.1990.tb06579.x.
17. Detrick, R. S., R. S. White, and G. M. Purdy (1993), Crustal structure of North Atlantic fracture zones, Rev. Geophys., 31, 439-458, doi:10.1029/ 93RG01952. (Pubitemid 24423438)
18. Detrick, R. S., H. D. Needham, and V. Renard (1995), Gravity anomalies and crustal thickness variations along the Mid-Atlantic Ridge between 33°N and 40°N, J. Geophys. Res., 100, 3767-3787, doi:10.1029/94JB02649.
19. Dick, H. J. B., et al. (2000), A long in situ section of the lower oceanic crust: Results of ODP leg 176 drilling at the Southwest Indian Ridge, Earth Planet. Sci. Lett., 179, 31-51, doi:10.1016/S0012-821X(00)00102-3.
20. Dick, H. J. B., M. A. Tivey, and B. E. Tucholke (2008), Plutonic foundation of a slow-spreading ridge segment: Oceanic core complex at Kane Megamullion, 23°30'N, 45°20'W, Geochem. Geophys. Geosyst., 9, Q05014, doi:10.1029/2007GC001645.
21. Dunn, R. A., V. Lekić, R. S. Detrick, and D. R. Toomey (2005), Three-dimensional seismic structure of the Mid-Atlantic Ridge (35°N): Evidence for focused melt supply and lower crustal dike injection, J. Geophys. Res., 110, B09101, doi:10.1029/2004JB003473.
22. Escartin, J., and M. Cannat (1999), Ultramafic exposures and the gravity signature of the lithosphere near the Fifteen-Twenty fracture zones (Mid-Atlantic Ridge, 14°-16°N), Earth Planet. Sci. Lett., 171, 411-429, doi:10.1016/S0012-821X(99)00169-7.
23. Escartin, J., C. Mevel, C. J. MacLeod, and A. M. McCaig (2003), Constrains on deformation conditions and the origin of oceanic detachments: The Mid-Atlantic Ridge core complex at 15°45'N, Geochem. Geophys. Geosyst., 4(8), 1067, doi:10.1029/2002GC000472.
24. Flueh, E. R., and J. Bialas (1996), A digital, high data capacity ocean bottom recorder for seismic investigations, Int. Underwater Syst. Design, 18, 18-20.
25. Flueh, E. R., D. Klaeschen, and J. Bialas (2002), Options for multicomponent seismic data acquisition in deep water, First Break, 20, 764-769, doi:10.1046/j.1365-2397.2002.00329.x.
26. German, C. R., et al. (2008), Hydrothermal activity on the southern Mid-Atlantic Ridge: Tectonically and volcanically controlled venting at 4-5°S, Earth Planet. Sci. Lett., 273, 332-344, doi:10.1016/j.epsl.2008.06. 048.
27. Haase, K. M., et al. (2007), Young volcanism and related hydrothermal activity at 5°S on the slow-spreading southern Mid-Atlantic Ridge, Geochem. Geophys. Geosyst., 8, Q11002, doi:10.1029/2006GC001509.
28. Hacker, B. R., G. A. Abers, and S. M. Peacock (2003), Subduction factory: 1. Theoretical mineralogy, densities, seismic wave speeds, and water contents, J. Geophys. Res., 108(B1), 2029, doi:10.1029/2001JB001127.
29. Henstock, T. J., A. W. Woods, and R. S. White (1993), Accretion of oceanic crust by episodic sill intrusions, J. Geophys. Res., 98, 4143-4161, doi:10.1029/92JB02661.
30. Hobro, J. W. D., S. C. Singh, and T. A. Minshull (2003), Three-dimensional tomographic inversion of combined reflection and refraction traveltime data, Geophys. J. Int., 152, 79-93, doi:10.1046/j.1365-246X.2003. 01822.x. (Pubitemid 36029664)
31. Hooft, E. E. E., R. S. Detrick, D. R. Toomey, J. A. Collins, and J. Lin (2000), Crustal thickness and structure along three contrasting spreading segments of the Mid-Atlantic Ridge 33.5-35°N, J. Geophys. Res., 105, 8205-8226, doi:10.1029/1999JB900442.
32. Hosford, A., J. Lin, and R. S. Detrick (2001), Crustal evolution over the last 2 m.y. at the Mid-Atlantic Ridge OH-1 segment, 35°N, J. Geophys. Res., 106, 13,269-13,286, doi:10.1029/2001JB000235. (Pubitemid 32731779)
33. Karson, J. A. (1998), Internal structure of oceanic lithosphere: A perspective view from tectonic windows, in Faulting and Magmatism at Midocean Ridges, Geophys. Monogr. Ser., vol.106, edited by W. R. Buck et al., pp. 177-218, AGU, Washington, D. C.
34. Kelemen, P. B., E. Kikawa, D. J. Miller, and the Shipboard Scientific Party (2004), Proceedings of the Ocean Drilling Program, vol.209, Ocean Drill. Program, College Station, Tex., doi:10.2973/odp.proc.ir2209.2004.
35. Korenaga, J., W. S. Holbrook, G. M. Kent, P. B. Kelemen, R. S. Detrick, H.-C. Larsen, J. R. Hopper, and T. Dahl-Jensen (2000), Crustal structure of the southeast Greenland margin from joint refraction and reflection seismic tomography, J. Geophys. Res., 105, 21,591-21,614, doi:10.1029/2000JB900188. (Pubitemid 30793176)
36. Kuo, B. Y., and D. W. Forsyth (1988), Gravity anomalies of the ridge-transform system in the South Atlantic between 31 and 34.5°S: Upwelling centers and variations in crustal thickness, Mar. Geophys. Res., 10, 205-232, doi:10.1007/BF00310065.
37. Langmuir, C., et al. (1997), Hydrothermal vents near a mantle hot spot: The Lucky Strike vent field near 37°N on the Mid-Atlantic Ridge, Earth Planet. Sci. Lett., 148, 69-91, doi:10.1016/S0012-821X(97)00027-7. (Pubitemid 27403515)
38. Lin, J., and J. Phipps Morgan (1992), The spreading rate dependence of three-dimensional midocean ridge gravity structure, Geophys. Res. Lett., 19, 13-16, doi:10.1029/91GL03041.
39. Lin, J., G. M. Purdy, H. Schouten, and J. C. Sempere (1990), Evidence from gravity data for focused magmatic accretion along the Mid-Atlantic Ridge, Nature, 344, 627-632, doi:10.1038/344627a0. (Pubitemid 20414381)
40. Louden, K. E., R. S. White, C. G. Potts, and D. W. Forsyth (1986), Structure and seismotectonics of the Vema Fracture Zone, Atlantic Ocean, J. Geol. Soc., 143, 795-805, doi:10.1144/gsjgs.143.5.0795.
41. MacLeod, C. J., J. Escartin, D. Banerji, G. J. Banks, M. Gleeson, D. H. B. Irving, R. M. Lilly, A. M. McCaig, Y. Niu, and D. K. Smith (2002), Direct oceanic detachment faulting at the Mid-Atlantic Ridge, 15°45'N, Geology, 30, 879-882, doi:10.1130/0091-7613(2002)030〈0879:DGEFOD〉2.0.CO;2.
42. Magde, L. S., and D. W. Sparks (1997), Three-dimensional mantle upwelling, melt generation and melt migration beneath segmented slow spreading ridges, J. Geophys. Res., 102, 20,571-20,583, doi:10.1029/97JB01278.
43. Magde, L. S., A. H. Barcley, D. R. Toomey, R. S. Detrick, and J. A. Collins (2000), Crustal magma plumbing within a segment of the Mid-Atlantic Ridge, 35°N, Earth Planet. Sci. Lett., 175, 55-67, doi:10.1016/S0012- 821X(99)00281-2.
44. Muller, M. R., T. A. Minshull, and R. S. White (2000), Crustal structure of the Southwest Indian Ridge at the Atlantis II Fracture Zone, J. Geophys. Res., 105, 25,809-25,828, doi:10.1029/91JB00431.
45. Navin, D. A., C. Pierce, and M. C. Sinha (1998), The RAMESSES experiment-II. Evidence for accumulated melt beneath a slow spreading ridge from wide-angle refraction and multichannel reflection seismic profiles, Geophys. J. Int., 135, 746-772, doi:10.1046/j.1365-246X.1998.00709.x.
46. Purdy, G. M., and R. S. Detrick (1986), Crustal structure of the Mid-Atlantic Ridge at 23°N from seismic refraction studies, J. Geophys. Res., 91, 3739-3762, doi:10.1029/JB091iB03p03739.
47. Reston, T. J., W. Weinrebe, I. Grevemeyer, E. R. Flueh, N. C. Mitchell, L. Kirstein, C. Kopp, H. Kopp, and Participants of METEOR 47/2 (2002), A rifted inside corner massif on the Mid-Atlantic Ridge at 5°S, Earth Planet. Sci. Lett., 200, 255-269, doi:10.1016/S0012-821X(02)00636-2.
48. Schilling, J. G., M. Zajac, R. Evans, T. Johnston, W. White, J. Devine, and R. Kingsley (1983), Petrologic and geochemical variations along the Mid-Atlantic Ridge from 27°N to 73°N, Am. J. Sci., 283, 510-586.
49. Shtivelman, V., and A. Canning (1988), Datum correction by wave-equation extrapolation, Geophysics, 53, 1311-1322, doi:10.1190/1.1442409.
50. Singh, S. C., W. C. Crawford, H. Carton, T. Seher, V. Combier, M. Cannat, J. P. Canales, D. Düsünür, J. Escartin, and M. Miranda (2006), Discovery of a magma chamber and faults beneath a Mid-Atlantic Ridge hydrothermal field, Nature, 442, 1029-1032, doi:10.1038/nature05105.
51. Sinha, M., and K. E. Louden (1983), The Oceanographer fracture zone: Crustal structure from seismic refraction studies, Geophys. J. R. Astron. Soc., 75, 713-736.
52. Sinha, M., S. C. Constable, C. Pierce, A. White, G. Heinson, L. M. MacGregor, and D. A. Navin (1998), Magmatic processes at slow spreading ridges: Implications of the RAMESSES experiment at 57°45'N on the Mid-Atlantic Ridge, Geophys. J. Int., 135, 731-745, doi:10.1046/j.1365-246X.1998.00704.x. (Pubitemid 29085768)
53. Sinton, J. M., and R. S. Detrick (1992), Mid-ocean ridge magma chambers, J. Geophys. Res., 97, 197-216, doi:10.1029/91JB02508.
54. Soule, S. A., D. J. Fornari, M. R. Perfit, and K. H. Rubin (2007), New insights into mid-ocean ridge volcanic processes from the 2005-2006 eruption of the East Pacific Rise, 9°46'N-9°56'N, Geology, 35, 1079-1082, doi:10.1130/G23924A.1.
55. Tilmann, F., E. Flueh, L. Planert, T. Reston, and W. Weinrebe (2004), Microearthquake seismicity of the Mid-Atlantic Ridge at 5°S: A view of tectonic extension, J. Geophys. Res., 109, B06102, doi:10.1029/2003JB002827. (Pubitemid 39306313)
56. Tolstoy, M., A. J. Harding, and J. A. Orcutt (1993), Crustal thickness on the Mid-Atlantic Ridge: Bull's eye gravity anomalies and characterized accretion, Science, 262, 726-729, doi:10.1126/science.262.5134.726. (Pubitemid 24422336)
57. Tucholke, B. E., and J. Lin (1994), A geological model for the structure of ridge segments in slow spreading ocean crust, J. Geophys. Res., 99, 11,937-11,958, doi:10.1029/94JB00338.
58. Tucholke, B. E., J. Lin, M. C. Kleinrock, M. A. Tivey, T. B. Reed, J. Goff, and G. E. Jaroslow (1997), Segmentation and crustal structure of the western Mid-Atlantic Ridge flank, 25°25'-27°10'N and 0-29 m.y., J. Geophys. Res., 102, 10,203-10,223, doi:10.1029/96JB03896.
59. Tucholke, B. E., K. Fujioka, T. Ishihara, G. Hirt, and M. Kinoshita (2001), Submersible study of an oceanic megamullion in the North Atlantic, J. Geophys. Res., 106, 16,145-16,162, doi:10.1029/2001JB000373.
60. Van Avendonk, H. J. A., A. J. Harding, J. A. Orcutt, and W. S. Holbrook (1998), A two-dimensional tomographic study of the Clipperton transform fault, J. Geophys. Res., 103, 17,885-17,889, doi:10.1029/98JB00904.
61. Wessel, P., and W. H. F. Smith (1995), New version of the generic mapping tools released, Eos Trans. AGU, 76, 329, doi:10.1029/95EO00198.
62. White, R. S., D. McKenzie, and R. K. O'Nions (1992), Oceanic crustal thickness from seismic measurements and rare earth element inversion, J. Geophys. Res., 97, 19,683-19,715, doi:10.1029/92JB01749.
63. Whitmarsh, R. B., and A. J. Calvert (1986), Crustal structure of Atlantic fracture zones, I, The Charlie Gibbs fracture zone, Geophys. J. R. Astron. Soc., 85, 107-138.
64. Wiener, N. (1949), Extrapolation, Interpolation, and Smoothing of Stationary Time Series, John Wiley, New York.
65. Zelt, C. A. (1999), Modelling strategies and model assessment for wide-angle seismic traveltime data, Geophys. J. Int., 139, 183-204, doi:10.1046/j.1365-246X.1999.00934.x.
66. Zhang, J., and M. N. Toksöz (1998), Nonlinear refraction traveltime tomography, Geophysics, 63, 1726-1737, doi:10.1190/1.1444468.