The Gakkel Ridge: Bathymetry, gravity anomalies, and crustal accretion at extremely slow spreading rates

Journal of Geophysical Research: Solid Earth

Volumn 108, Issue 2, 2003, Pages

  Cochran, James R ^a   Kurras, Gregory J ^b   Edwards, Margo H ^b   Coakley, Bernard J ^c,d  

^a Department of Earth and Environmental Sciences   (United States)

^b UNIVERSITY OF HAWAII   (United States)

^c Tulane University   (United States)

^d UNIVERSITY OF ALASKA FAIRBANKS   (United States)

Author keywords

Arctic Ocean; Eurasian Basin; Gakkel Ridge; Mid ocean ridge; Oceanic crust; Volcanic emplacement

Indexed keywords

GRAVITY ANOMALY; MID-OCEAN RIDGE; OCEANIC CRUST; PLATE TECTONICS; SPREADING CENTER;

ARCTIC OCEAN; GAKKEL RIDGE;

EID: 0037772238     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: None     Document Type: Article

References (65)

1. Bell, R. E., and A. B. Watts, Evaluation of the BGM-3 sea gravity meter system onboard R/V Conrad, Geophysics, 51, 1480-1493, 1986.
2. Bergh, H. W., and I. O. Norton, Prince Edward fracture zone and the evolution of the Mozambique Ridge, J. Geophys. Res., 81, 5221-5239, 1976.
3. Blackman, D. K., and D. W. Forsyth, Isostatic compensation of tectonic features of the Mid-Atlantic Ridge: 25-27°S, J. Geophys. Res., 96, 11,741-11,758, 1991.
4. Blackman, D. K., J. R. Cann, B. Janssen, and D. K. Smith, Origin of extensional core complexes: Evidence from the Mid-Atlantic Ridge at Atlantis Fracture Zone, J. Geophys. Res., 103, 21,315-21,333, 1998.
5. Bown, J. W., and R. S. White, Variation with spreading rate of oceanic crustal thickness and geochemistry, Earth Planet. Sci. Lett., 121, 435-449, 1994.
6. Brown, J. R., and J. A. Karson, Variations in axial processes on the Mid-Atlantic Ridge: The median valley of the MARK area, Mar. Geophys. Res., 10, 109-138, 1988.
7. Carbotte, S. M., and K. C. Macdonald, The axial topographic high at intermediate and fast spreading ridges, Earth Planet. Sci. Lett., 128, 85-97, 1994a.
8. Carbotte, S. M., and K. C. Macdonald, Comparison of seafloor tectonic fabric at intermediate, fast, and super fast spreading ridges: Influence of spreading rate, plate motions, and ridge segmentation on fault patterns, J. Geophys. Res., 99, 13,609-13,631, 1994b.
9. Chayes, D. N., B. J. Coakley, M. G. Langseth, R. M. Anderson, G. DiBella, M. R. Rognstad, R. B. Davis, M. H. Edwards, J. G. Kosalos, and S. J. Szender, SCAMP: An enhanced geophysical mapping system for Arctic submarine cruises, Eos Trans. AGU, 77, F315, 1996.
10. Chayes, D. N., R. M. Anderson, J. L. Ardai, B. J. Coakley, R. B. Davis, M. H. Edwards, and M. R. Rognstad, SCAMP performance, Eos Trans. AGU, 80, F1001, 1999.
11. Chen, Y. J., Oceanic crustal thickness versus spreading rate, Geophys. Res. Lett., 8, 753-756, 1992.
12. Chen, Y. J., and W. J. Morgan, Rift valley/no rift valley transition at mid-ocean ridges, J. Geophys. Res., 95, 17,571-17,581, 1990.
13. Coakley, B. J., and J. R. Cochran, Gravity evidence of very thin crust at the Gakkel Ridge (Arctic Ocean), Earth Planet. Sci. Lett., 162, 81-95, 1998.
14. Cochran, J. R., and B. J. Coakley, Morphology and segmentation of the Gakkel Ridge, Arctic Ocean, from SCICEX data (Abst.), Eos Trans. AGU, 79, F854, 1998.
15. DeMets, C., R. G. Gordon, D. F. Argus, and S. Stein, Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191-2194, 1994.
16. Detrick, R. S., 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.
17. Dick, H. J. B., G. J. Kurras, J. Snow, W. Jokat, P. Michael, and C. Langmuir, Volcanic and tectonic processes along the Gakkel Ridge: Morphologic interpretation of axial valley features and samples from the Arctic Mid-Ocean Ridge Expedition (AMORE) (Abst.), Eos Trans. AGU, 82, F1098, 2001.
18. Duckworth, G. L., A. B. Baggeroer, and H. R. Jackson, Crustal structure measurements near FRAM II in the Pole Abyssal Plain, Tectonophysics, 89, 172-215, 1982.
19. Edwards, M. H., G. J. Kurras, M. Tolstoy, D. R. Bohnenstiehl, B. J. Coakley, and J. R. Cochran, Evidence of recent volcanic activity on the ultraslow-spreading Gakkel Ridge, Nature, 409, 808-812, 2001.
20. Feden, R. H., P. R. Vogt, and H. S. Fleming, Magnetic and bathymetric evidence for the "Yermak hot spot" northwest of Svalbard in the Arctic Basin, Earth Planet. Sci. Lett., 44, 18-38, 1979.
21. Fisher, R. L., and J. G. Sclater, Tectonic evolution of the Southwest Indian Ocean since the Mid-Cretaceous: Plate motions and stability of the pole of Antarctica/Africa for at least 80 m.g.r., Geophys. J. R. Astron. Soc., 73, 553-576, 1983.
22. Fox, P. J., N. R. Grindlay, and K. C. Macdonald, The Mid-Atlantic Ridge (31°S-34°30'S): Temporal and spatial variations of accretionary processes, Mar. Geophys. Res., 13, 1-20, 1991.
23. Hooft, E. E. E., R. S. Detrick, D. R. Toomey, J. A. Collins, and J. Lin, Crustal thickness and structure along three contrasting spreading segments of the Mid-Atlantic Ridge, 33.5°E-35°E, J. Geophys. Res., 105, 8205-8226, 2000.
24. Jackson, H. R., I. Reid, and R. K. H. Falconer, Crustal structure near the Arctic Mid-Ocean Ridge, J. Geophys. Res., 87, 1773-1783, 1982.
25. Jackson, H. R., D. A. Forsyth, J. K. Hall, and A. Overton, Seismic reflection and refraction, in The Arctic Ocean Region, edited by A. Grantz et al., pp. 153-170, Geol. Soc. of Am., Boulder, Colo., 1990.
26. Jakobsson, M., N. Cherkis, J. Woodward, R. McNab, and B. Coakley, New grid of Arctic bathymetry aids scientists and mapmakers, Eos Trans. AGU, 81, 89-96, 2000.
27. Johnson, G. L., Morphology of the Eurasian Arctic Basin, Polar Rec., 14, 619-628, 1969.
28. Johnson, G. L., and B. C. Heezen, The Arctic Mid-Ocean Ridge, Nature, 215, 724-725, 1967.
29. Johnson, G. L., A. Grantz, and J. R. Weber, Bathymetry and physiography, in The Arctic Ocean Region, edited by A. Grantz et al., pp. 63-78, Geol. Soc. of Am., Boulder, Colo., 1990.
30. Jokat, W., E. Weigelt, Y. Kristoffersen, T. Rasmussen, and T. Schöne, New geophysical results from the south-western Eurasian Basin (Morris Jessup Rise, Gakkel Ridge, Yermak Plateau) and the Fram Strait, Geophys. J. Int., 123, 601-610, 1995.
31. Kovacs, L. C., C. Bernero, G. L. Johnson, R. H. Pilger, S. P. Srivastava, P. T. Taylor, G. E. Vink, and P. R. Vogt, Residual Magnetic Anomaly Chart of the Arctic Ocean Region, Geol. Soc. of Am., Boulder, Colo., 1985.
32. Kristoffersen, Y., Eurasia basin, in The Arctic Ocean Region, edited by A. Grantz et al., pp. 365-378, Geol. Soc. of Am., Boulder, Colo., 1990.
33. Kuo, B. Y., and D. W. Forsyth, 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, 1988.
34. Kurras, G. J., M. H. Edwards, J. R. Cochran, and B. J. Coakley, Tectonism and volcanism along the Gakkel mid-ocean ridge (5°-74°E): Initial processing and analysis of SCAMP Sidescan data from SCICEX '98 and '99, Eos Trans. AGU, 80, F998, 1999.
35. Kurras, G. J., M. H. Edwards, R. M. Anderson, P. Michael, J. R. Cochran, and B. J. Coakley, Comparison of Seabeam 2112 and SCAMP bathymetry data along the Gakkel Ridge: Preliminary mapping results from the Healy0102 cruise, in Oceans 2001 MTS/IEEE Proceedings, pp. 1496-1499, Inst. of Electr. and Electron. Eng., Washington, D.C., 2001.
36. Langmuir, C. H., K. Lehnert, S. L. Goldstein, P. Michael, D. Graham, and B. Schramm, Petrology of Gakkel Ridge basalts: Preliminary results, Eos Trans. AGU, 82, F1098-F1099, 2001.
37. Lin, J., G. M. Purdy, H. Schouten, J. C. Sempere, and C. Zervas, Evidence from gravity data for focused magmatic accretion along the Mid-Atlantic Ridge, Nature, 344, 627-632, 1990.
38. Macdonald, K. C., P. J. Fox, R. T. Alexander, R. Pockalny, and P. Gente, Volcanic growth faults and the origin of Pacific abyssal hills, Nature, 380, 125-129, 1996.
39. Michael, P. J., et al., Mantle control of a dynamically evolving spreading center: Mid-Atlantic Ridge 31-34°S, Earth Planet. Sci. Lett., 121, 451-468, 1994.
40. Minshull, T. A., Along-axis variations on oceanic crustal density an their contribution to gravity anomalies at slow-spreading ridges, Geophys. Res. Lett., 23, 849-852, 1996.
41. Müller, C., and W. Jokat, Seismic evidence for volcanic activity discovered in the central Arctic, Eos Trans. AGU, 81, 265-269, 2000.
42. Mutter, J. C., and J. A. Karson, Structural processes at slow-spreading ridges, Science, 257, 627-634, 1992.
43. Ostenso, N. A., and R. J. Wold, Aeromagnetic evidence for origin of Arctic Ocean Basin, in Arctic Geology, edited by M. G. Pitcher, pp. 506-516, Am. Assoc. of Pet. Geol., Tulsa, Okla., 1973.
44. Pariso, J. E., J. C. Sempere, and C. Rommevaux, Temporal and spatial variations in crustal accretion along the Mid-Atlantic Ridge (29°N-31°N) over the last 10 m.y.: Implications from a three-dimensional gravity study, J. Geophys. Res., 100, 17,781-17,794, 1995.
45. Parker, R. L., The rapid calculation of potential anomalies, Geophys. J. R. Astron. Soc., 31, 447-455, 1973.
46. Patriat, P., Reconstitution de l'evolution du systeme de dorsales de l'ocean Indien par les methodes de la Cinematique des Plaques, 310 pp., Territ. des Terres Australes et Antarctiques Fr., Paris, 1987.
47. Phipps Morgan, J., and Y. J. Chen, Dependence of ridge-axis morphology on magma supply and spreading rate, Nature, 364, 706-708, 1993.
48. Phipps Morgan, J., and D. W. Forsyth, Three-dimensional flow and temperature perturbations due to a transform offset: Effects on oceanic crustal and upper mantle structure, J. Geophys. Res., 93, 2955-2966, 1988.
49. Prince, R. A., and D. W. Forsyth, Horizontal extent of anomalously thin crust near the Vema Fracture Zone from the three-dimensional analysis of gravity anomalies, J. Geophys. Res., 93, 8051-8063, 1988.
50. Reid, I., and H. R. Jackson, Oceanic spreading rate and crustal thickness, Mar. Geophys. Res., 5, 165-172, 1981.
51. Rommevaux-Jestin, C., N. R. Grindlay, J. A. Madsen, and J. Sclater, Magnetic and kinematic study at the Southwest Indian Ridge between 15°E and 35°E (Abst.), Eos Trans. AGU, 77, F689, 1996.
52. Sempere, J. C., G. M. Purdy, and H. Schouten, Segmentation of the Mid-Atlantic Ridge between 24°N and 30°40′N, Nature, 344, 427-431, 1990.
53. Sempere, J. C., J. Lin, H. S. Brown, H. Schouten, and G. M. Purdy, Segmentation and morphologic variations along a slow-spreading center: The Mid-Atlantic Ridge (24°00′N-30°40′N), Mar. Geophys. Res., 15, 153-200, 1993.
54. Severinghaus, J. P., and K. C. Macdonald, High inside corners at ridge-transform intersections, Mar. Geophys. Res., 9, 353-367, 1988.
55. Smith, D. K., and J. R. Cann, Hundreds of small volcanoes on the median valley floor of the Mid-Atlantic Ridge at 24-30°N, Nature, 348, 152-155, 1990.
56. Smith, D. K., and J. R. Cann, The role of seamount volcanism in crustal construction at the Mid-Atlantic Ridge (24°-30°N), J. Geophys. Res., 97, 1645-1658, 1992.
57. Smith, D. K., and J. R. Cann, Building the crust at the Mid-Atlantic Ridge, Nature, 365, 707-715, 1993.
58. Smith, D. K., J. R. Cann, M. E. Dougherty, J. Lin, S. Spencer, C. MacLeod, K. J. E. McAllisrwe, B. Brooks, R. Pascoe, and W. Robertson, Mid-Atlantic Ridge volcanism from deep-towed side-scan sonar images, 25°-29°N, J. Volcanol. Geotherm. Res., 67, 232-262, 1995.
59. Sparks, D. W., and E. M. Parmentier, The generation and migration of partial melt beneath oceanic spreading centers, in Magmatic Systems, edited by M. P. Ryan, pp. 55-76, Academic, San Diego, Calif., 1994.
60. Tolstoy, M., A. J. Harding, and J. A. Orcutt, Crustal thickness on the Mid-Atlantic Ridge: Bull's eye gravity anomalies and focused accretion, Science, 262, 726-729, 1993.
61. Tolstoy, M., D. R. Bohnenstiehl, M. H. Edwards, and G. J. Kurras, Seismic character of volcanic activity at the ultraslow-spreading Gakkel Ridge, Geology, 29, 1139-1142, 2001.
62. Tucholke, B. E., and J. Lin, A geologic model for the structure of ridge segments in slow-spreading ocean crust, J. Geophys. Res., 99, 11,937-11,958, 1994.
63. Vogt, P. R., P. T. Taylor, L. C. Kovacs, and G. L. Johnson, Detailed aeromagnetic investigation of the Arctic Basin, J. Geophys. Res., 84, 1071-1089, 1979.
64. Weissel, J. K., and G. Karner, Flexural uplift of rifts flanks due to mechanical unloading of the lithosphere during extension, J. Geophys. Res., 94, 13,919-13,950, 1989.
65. White, R. S., D. McKenzie, and R. K. O'Nions, Oceanic crustal thickness from seismic measurements and rare earth element inversions, J. Geophys. Res., 97, 19,683-19,715, 1992.