Seismic imaging of the axial region of the Valu Fa Ridge, Lau Basin - the accretionary processes of an intermediate back-arc spreading ridge

Geophysical Journal International

Volumn 138, Issue 2, 1999, Pages 495-519

  Turner, Ian M ^a,c   Peirce, Christine ^a   Sinha, Martin C ^b  

^a DURHAM UNIVERSITY   (United Kingdom)

^b UNIVERSITY OF CAMBRIDGE   (United Kingdom)

^c SHELL GLOBAL SOLUTIONS INTERNATIONAL B V   (United States)

Author keywords

Back arc basin; Crustal structure; Low velocity zone; Melt generation; Mid ocean ridges; Seismic velocities

Indexed keywords

BACKARC BASIN; CRUSTAL STRUCTURE; LOW VELOCITY ZONE; MID-OCEAN RIDGE; SEISMIC VELOCITY;

PACIFIC OCEAN;

EID: 0032713997     PISSN: 0956540X     EISSN: None     Source Type: Journal    
DOI: 10.1046/j.1365-246X.1999.00883.x     Document Type: Article

References (83)

1. Barth, G.A. & Mutter, J.C., 1996. Variability in oceanic crustal thickness and structure: Multichannel seismic reflection results from the northern East Pacific Rise, J. geophys. Res., 101(B8), 17951-17975.
2. Bratt, S.R. & Purdy, G.M., 1984. Structure and variability of oceanic crust on the flanks of the East Pacific Rise between 11° and 13°N, J. geophys. Res., 89(B7), 6111-6125.
3. Buck, W.R., Carbotte, S.M. & Mutter, C.Z., 1995. Controls on extrusion at mid-ocean ridges, Geology, 25, 935-938.
4. Calvert, A.J., 1995. Seismic evidence for a magma chamber beneath the slow-spreading Mid-Atlantic Ridge, Nature, 377, 410-414.
5. Calvert, S.E.E., 1996. Southern Valu Fa Ridge, The Lau Basin: A gravity and bathymetric investigation, MSc thesis, University of Durham.
6. Carbotte, S.M., Mutter, J.C. & Xu, L., 1997. Contribution of volcanism and tectonism to axial and flank morphology of the Southern East Pacific Rise 17°10′5-17°40′S, from a study of layer 2A geometry, J. geophys. Res., 102(B5), 10 165-10 184.
7. Carbotte, S.M., Mutter, C.Z., Mutter, J.C. & Ponce-Correa, G., 1998. Influence of magma supply and spreading rate on crustal magma bodies and emplacement of the extrusive layer: Insights from the East Pacific Rise at lat. 16°N, Geology, 26, 455-458.
8. 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(B6), 9243-9264.
9. Carlson, R.L. & Raskin, G.S., 1984. Density of the oceanic crust, Nature, 311, 555-558.
10. Chapman, C.H. & Drummond, R., 1982. Body-wave seismograms in inhomogeneous media using Maslov asymptotic theory, Bull. seism. Soc. Am., 72, 5277-5317.
11. Christensen, N.I. & Salisbury, M.H., 1975. Structure and constitution of the lower oceanic crust, Rev. Geophys. Space Phys., 13, 57-86.
12. Christeson, G.L., Purdy, G.M. & Rhor, K.M.M., 1993. Structure of the northern symmetrical segment of the Juan de Fuca Ridge, Mar. geophys. Res., 15, 219-240.
13. Collier, J.S., 1990. Seismic imaging of magma chambers and mud diapirs, PhD thesis, University of Cambridge.
14. Collier, J.S. & Singh, S.C., 1997. Detailed structure of the top of the melt body beneath the East Pacific Rise at 9°40′N from waveform inversion of seismic reflection data, J. geophys. Res., 102(B9), 20287-20304.
15. 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.
16. Collier, J.S. & Sinha, M.C., 1992a. The Valu Fa Ridge: The pattern of volcanic activity at a back-arc spreading centre, Mar. Geol., 104, 243-263.
17. Collier, J.S. & Sinha, M.C., 1992b. Seismic mapping of a magma chamber beneath the Valu Fa Ridge, Lau Basin, J. geophys. Res., 97(B10), 14031-14053.
18. Cudrack, C.F. & Clowes, R.M., 1993. Crustal structure of Endeavour Ridge segment, Juan de Fuca Ridge, from a detailed seismic refraction survey, J. geophys. Res., 98(B4), 6329-6349.
19. Davis, A.S., Clague, D.A. & Morton, J.L., 1990. Volcanic glass compositions from two spreading centres in the Lau Basin, Southwest Pacific, Geol. Jahrb., Reihe D, 72, 481-501.
20. Day, A.J., 1997. Seismic reflection imaging and modelling of the melt lens beneath the Valu Fa Ridge, MSc thesis, University of Durham.
21. Detrick, R.S., Buhl, P., Vera, E.E., Mutter, J.C., Orcutt, J.A., Madsen, J. & Brocher, T., 1987. Multi-channel seismic imaging of a crustal magma chamber along the East Pacific Rise, Nature, 326, 35-41.
22. 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.
23. Detrick, R.S., Collins, J., Stephen, R. & Swift, S., 1994. In situ evidence of the nature of the seismic layer 2/3 boundary in oceanic crust, Nature, 370, 288-290.
24. Dunn, R.A. & Toomey, D.R., 1997. Seismological evidence for 3-D melt migration beneath the East Pacific Rise, Nature, 388, 259-262.
25. Fouquet, Y., von Stackelberg, U., Charlou, J.L., Donval, J.P., Foucher, J.P., Erzinger, J., Herzig, P., Mühe, R., Wiedicke, M., Soakai, S. & Whitechurch, H., 1991. Hydrothermal activity in the Lau back-arc basin: Sulphides and water chemistry, Geology, 19, 303-306.
26. Fouquet, Y., von Stackelberg, U., Charlou, J.L., Erzinger, J., Herzig, P., Mühe, R. & Wiedicke, M., 1993. Metallogenesis in back-arc environments, Ec. Geol., 88, 2154-2181.
27. Fowler, C.M.R., 1990. The Solid Earth: an Introduction to Global Geophysics, Cambridge University Press, Cambridge.
28. Frenzel, G., Mühe, R. & Stoffers, P., 1990. Petrology of the volcanic rocks from the Lau Basin, Southwest Pacific, Geol. Jahrb., Reihe D, 72, 395-479.
29. 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(B8), 13 925-13 944.
30. Herron, T.J., Stoff, P.L. & Buhl, P., 1980. Magma chamber and mantle reflections - East Pacific Rise, Geophys. Res. Lett., 7, 989-992.
31. Hilton, D.R., Hammerschmidt, K., Loock, G. & Friedrichsen, H., 1993. Helium and argon isotope systematics of the Central Lau Basin and Valu Fa Ridge: Evidence of crust/mantle interactions in a back-arc basin, Geochim. cosmochim. Acta, 57, 2819-2841.
32. 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(B12), 27 319-27 340.
33. Houtz, R. & Ewing, J., 1976. Upper crustal structure as a function of plate age, J. geophys. Res., 81, 2490-2498.
34. Jenner, G.A., Cawood, P.A., Rautenschlein, M. & White, W.M., 1987. Composition of back-arc volcanics, Valu Fa Ridge, Lau Basin: Evidence for slab-derived component in their mantle source, J. Volc. Geotherm. Res., 32, 209-222.
35. 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(B4), 6143-6161.
36. 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.
37. Kent, G.M., Harding, A.J. & Orcutt, J.A., 1993. Distribution of magma beneath the East Pacific Rise near the 9°03′N deval from forward modelling of common depth point data, J. geophys. Res., 98(B8), 13971-13995.
38. 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(B5), 9097-9116.
39. Kim, I.I. & Orcutt, J.A., 1989. Effects of disrupted axial morphology on the amplitude strength of the crustal magma chamber reflector at the East Pacific Rise, EOS, Trans Am. geophys. Un. Fall Mtg Suppl., 73(43), 133.
40. 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.
41. Lonsdale, P., 1983. Overlapping rift zones at the 5.5°S offset of the East Pacific Rise, J. geophys. Res., 88(B11), 9393-9406.
42. Lonsdale, P., 1986. Comments on 'East Pacific Rise from Siqueiros to Orinoco FZ: along strike continuity of axial neovolcanic zone and structure and evolution of overlapping spreading centres.' by K. Macdonald, J. Sempere and P. J. Fox, J. geophys. Res., 91(B11), 10493-10499.
43. 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(B7), 6049-6069.
44. Macdonald, K.C., Sempere, J. & Fox, P.J., 1986. The debate concerning overlapping spreading centres and mid-ocean ridge processes, J. geophys. Res., 91(B11), 10 501-10 511.
45. Morton, J.L. & Sleep, N.H., 1985. Seismic reflections from a Lau Basin magma chamber, in Geology and Offshore Resources of Pacific Island Arcs - Tonga Region, pp. 441-453, eds Scholl, D.W. & Vallier, T.L., Earth Sci. Ser. 2, Circum-Pacific Council for Energy and Mineral Resources, Houston, TX.
46. Murase, T. & McBirney, A.R., 1973. Properties of some common igneous rocks and their melts at high temperatures, Geol. Soc. Am. Bull., 84, 3563-3592.
47. Nafe, J.E. & Drake, C.L., 1957. Variation with depth in shallow and deep water marine sediment of porosity, density and the velocities of compressional and shear waves, Geophysics, 22, 523-553.
48. NAUTILAU Group, 1990. Hydrothermal activity in the Lau Basin, EOS, Trans. Am. geophys. Un., 71, 678-679.
49. Navin, D.A., 1996. Seismic investigation of crustal accretion at the slow-spreading Mid-Atlantic Ridge - The Reykjanes Ridge at 57°45′N, PhD thesis, University of Durham.
50. Navin, D.A., Peirce, C. & Sinha, M.C., 1998. RAMESSES 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.
51. Parson, L.M., Pearce, J.A., Murton, B.J., Hodkinson, R.A. & R.R.S. Charles Darwin Scientific Party, 1990. Role of ridge jumps and ridge propagation in the tectonic evolution of the Lau back-arc basin, Southwest Pacific, Geology, 18, 470-473.
52. Parson, L.M. & Wright, I.C., 1996. The Lau-Havre-Taupo back-arc basin: a southward-propagating, multi-stage evolution from rifting to spreading, Tectonophysics, 263, 1-22.
53. Peirce, C., 1990. Crustal structure of the Africa - Eurasian plate boundary, PhD thesis, University of Cambridge.
54. Peirce, C., Sinha, M.C. & Constable, S., 1996. Controlled-source electromagnetic and seismic investigation of the Valu Fa Ridge, Lau Basin, SW Pacific, R/V Maurice Ewing 9512 Cruise Report, (unpublished).
55. Purdy, E.M., Kong, L.S.L., Christeson, G.L. & Solomon, S.C., 1992. Relationship between spreading rate and the seismic structure of mid-ocean ridges, Nature, 355, 815-817.
56. Rohr, K., Mildreit, B. & Yorath, C.J., 1988. Asymmetric deep crustal structure across the Juan de Fuca Ridge, Geology, 16, 533-537.
57. Shipboard Scientific Party, 1973. Site reports, Init. Rep. Deep Sea Drill. Proj., XXI, 17-32.
58. Shipboard Scientific Party, 1992. Site reports, Proc. Ocean Drill. Prog, Init. Rep., 135, 489-570.
59. Singh, S.C., Kent, G.M., Collier, J.S., Harding, A.J. & Orcutt, J.A., 1998. Melt to mush variations in crustal magma properties along the ridge crest at the Southern East Pacific Rise, Nature, 394, 874-878.
60. Sinha, M.C., 1988. Cruise report: RKS Charles Darwin 34, Southern Lau Basin, Internal report, Bullard Laboratories, Cambridge University.
61. Sinha, M.C., 1995. Segmentation and rift propagation at the Valu Fa Ridge, Lau Basin: Evidence from gravity data, J. geophys. Res., 100(B8), 15025-15043.
62. 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., 355, 233-253.
63. Sinha, M.C., Constable, S.C., Peirce, C., White, A., Heinson, G., MacGregor, L.M. & Navin, D.A., 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.
64. Sleep, N.H., 1975. Formation of oceanic crust: some thermal constraints, J. geophys. Res., 80, 4037-4042.
65. Smallwood, J.R., White, R.S. & Minshull, T.A., 1995. Seafloor spreading in the presence of the Iceland plume: the structure of the Reykjanes Ridge at 61°40′N, J. geol. Soc. Lond., 152, 1023-1029.
66. Smewing, J.D., 1981. Mixing characteristics and compositional differences in mantle-derived melts beneath spreading axes: Evidence from cyclically layered rocks in the ophiolite of North Oman, J. geophys. Res., 86, 2645-2659.
67. Solomon, S.C. & Toomey, D.R., 1992. The structure of mid-ocean ridges, Ann. Rev. Earth planet. Sci. Lett., 20, 329-364.
68. Spudich, P. & Orcutt, J.A., 1980. A new look at the seismic velocity structure of the oceanic crust, Rev. Geophys. Space Phys., 18, 627-645.
69. Talwani, M., Worzel, J. & Landisman, M., 1959. Rapid gravity calculations for two-dimensional bodies with application to the Mendocino submarine fracture zone, J. geophys. Res., 64, 49-59.
70. Taylor, B., Zellmer, K., Martinez, F. & Goodliffe, A., 1996. Seafloor spreading in the Lau back-arc basin. Earth planet. Sci. Lett., 144, 35-40.
71. Thomson, C.J. & Chapman, C.H., 1986. End-point contributions to synthetic seismograms, Geophys. J. R. astr. Soc., 87, 285-294.
72. 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.
73. 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(B12), 24 135-24 157.
74. Vallier, T.L. et al., 1991. Subalkaline andesite from Valu Fa Ridge, a back-arc spreading centre in the Southern Lau Basin: petrogenesis, comparative chemistry, and tectonic implications, Chem. Geol., 91, 227-256.
75. 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(B2), 3031-3041.
76. 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 0-0.2 Ma, old oceanic crust at 9°N on the East Pacific Rise from expanded spread profiles, J. geophys. Res., 95(B10), 15 529-15 556.
77. von Stackelberg, U. & the Shipboard Scientific Party, 1988. Active hydrothermalism in the Lau back-arc basin (SW Pacific): First results from the SONNE 48 Cruise, Mar. Min., 7, 431-442.
78. Wessel, P. & Smith, W.H.F., 1995. New, Version of the Generic Mapping Tools released, EOS, Trans. Am. geophys. Un., 76, 329.
79. White, R.S., McKenzie, D.P. & O'Nions, R.K., 1992. Oceanic crustal thickness from seismic measurements and rare earth element inversions, J. geophys. Res., 97(B13), 19683-19715.
80. Wiedicke, M. & Collier, J.S., 1993. Morphology of the Valu Fa spreading ridge in the Southern Lau Basin, J. geophys. Res., 98(B7), 11769-11782.
81. Wilcock, W.S.D., Dougherty, M.E., Solomon, S.C., Purdy, G.M. & Toomey, D.R., 1993. Seismic propagation across the East Pacific Rise: Finite difference experiments and implications for seismic tomography, J. geophys. Res., 98(B11), 19 913-19 932.
82. Wilson, D.S., Clague, D.A., Sleep, N.H. & Morton, J.L., 1988. Implications of magma convection for the size and temperature of magma chambers at fast spreading ridges, J. geophys. Res., 93(B10), 11 974-11 984.
83. Zelt, C.A. & Smith, R.B., 1992. Seismic travel-time inversion for 2-D crustal velocity structure, Geophys. J. Int., 108, 16-34.