Identification and implications of off-axis lava flows around the East Pacific Rise

Geochemistry, Geophysics, Geosystems

Volumn 1, Issue 6, 2000, Pages

  Reynolds, Jennifer R ^a,b   Langmuir, Charles H ^a  

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

^b DUKE UNIVERSITY   (United States)

Author keywords

East Pacific Rise; mantle melting; melt focusing; MORB; off axis; seamount

Indexed keywords

BASALT; MELTING; PLUMBING; STRONTIUM; STRUCTURAL GEOLOGY; TRACE ELEMENTS; WATER PIPING SYSTEMS;

EAST PACIFIC RISE; MANTLE MELTING; MORB; OFF-AXIS; SEAMOUNT;

SUBMARINE GEOLOGY;

EID: 0003265363     PISSN: None     EISSN: 15252027     Source Type: Journal    
DOI: 10.1029/1999GC000033     Document Type: Article

References (52)

1. Alexander, R. T., and, K. C. Macdonald, (1996), Small off-axis volcanoes on the East Pacific Rise, Earth Planet. Sci. Lett., 139, 387-394.
2. Allan, J. F., R. Batiza, M. R. Perfit, D. J. Fornari, and, R. O. Sack, (1989), Petrology of lavas from the Lamont Seamount chain and adjacent East Pacific Rise, 10°N, J. Petrol., 30, 1245-1298.
3. Allan, J. F., R. Batiza, and, R. O. Sack, 1994), Geochemical characteristics of Cocos Plate seamount lavas, Contrib. Mineral. Petrol., 116, 47-61.
4. Babcock, J. M., A. J. Harding, G. M. Kent, and, J. A. Orcutt, (1998), An examination of along-axis variation of magma chamber witdth and crustal structure on the East Pacific Rise between 13°30′N and 12°20′N, J. Geophys. Res., 103, 30,451-30,467.
5. Barone, A. M., and, W. B. F. Ryan, (1990), Single plume model for asynchronous formation of the Lamont Seamounts and adjacent East Pacific Rise terrains, J. Geophys. Res., 95, 10,801-10,827.
6. Batiza, R., and, Y. Niu, (1992), Petrology and magma chamber processes at the East Pacific Rise ∼9°30′N, J. Geophys. Res., 97, 6779-6797.
7. Batiza, R., and, D. Vanko, (1984), Petrology of young Pacific seamounts, J. Geophys. Res., 89, 11,235-11,260.
8. Batiza, R., T. L. Smith, and, Y. Niu, (1989), Geological and petrological evolution of seamounts near the EPR based on submersible and camera study, Mar. Geophys. Res., 11, 169-236.
9. Batiza, R., Y. Niu, and, W. C. Zayac, (1990), Chemistry of seamounts near the East Pacific Rise: Implications for the geometry of subaxial mantle flow, Geology, 18, 1122-1125.
10. Christeson, G. L., G. M. Kent, G. M. Purdy, and, R. S. Detrick, (1996), Extrusive thickness variability at the East Pacific Rise, 9°-10°N: Constraints from seismic techniques, J. Geophys. Res., 101, 2859-2873.
11. Cousens, B. L., (1996), Depleted and enriched upper mantle sources for basaltic rocks from diverse tectonic environments in the northeast Pacific Ocean: The generation of oceanic alkaline vs. tholeiitic basalts, in Earth Processes: Reading the Isotopic Code, Geophys. Monogr. Ser., vol. 95, edited by, A. Basu, and, S Hart, pp. 207-231, AGU, Washington, D. C.
12. Crane, K., (1987), Structural evolution of the East Pacific Rise axis from 13°10′N to 10°35′N: Interpretations from SeaMARC I data, Tectonophyics, 136, 65-124.
13. Fornari, D. J., R. Batiza, and, J. F. Allan, (1987), Irregularly shaped seamounts near the East Pacific Rise: Implications for seamount origin and rise axis processes, in Seamounts, Islands, and Atolls, Geophys. Monogr. Ser., vol. 43, edited by, B. H. Keating, et al., pp. 35-47, AGU, Washington, D. C.
14. Fornari, D. J., M. R. Perfit, J. F. Allan, R. Batiza, R. Haymon, A. Barone, W. B. F. Ryan, T. Smith, T. Simkin, and, M. A. Luckman, (1988), Geochemical and structural studies of the Lamont Seamounts: Seamounts as indicators of mantle processes, Earth Planet. Sci. Lett., 89, 63-83.
15. Fornari, D. J., R. M. Haymon, M. R. Perfit, T. K. P. Gregg, and, M. H. Edwards, (1998), Axial summit trough of the East Pacific Rise 9°-10°N: Geological characteristics and evolution of the axial zone on fast spreading mid-ocean ridges, J. Geophys. Res., 103, 9827-9855.
16. Gente, P., J. M. Auzende, V. Renard, Y. Fouquet, and, D. Bideau, (1986), Detailed geological mapping by submersible of the East Pacific Rise axial graben near 13°N, Earth Planet. Sci. Lett., 78, 224-236.
17. Goldstein, S. J., M. R. Perfit, R. Batiza, D. J. Fornari, and, M. T. Murrell, (1994), Off-axis volcanism at the East Pacific Rise detected by uranium-series dating of basalts, Nature, 367, 157-159.
18. Harding, A. J., G. M. Kent, and, J. A. Orcutt, (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, 13,925-13,944.
19. Hirschmann, M. M., and, E. M. Stolper, (1996), A possible role for garnet pyroxenite in the origin of the "garnet signature" in MORB, Contrib. Mineral. Petrol., 124, 185-208.
20. Hooft, E. E. E., H. Schouten, and, R. S. Detrick, 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.
21. Hooft, E. E. E., R. S. Detrick, and, G. M. Kent, (1997), Seismic structure and indicators of magma budget along the southern East Pacific Rise, J. Geophys. Res., 102, 27,319-27,340.
22. Kappus, M. E., A. J. Harding, and, J. A. Orcutt, (1995), A baseline for upper crustal velocity variations along the East Pacific Rise at 13°N, J. Geophys. Res., 100, 6143-6161.
23. Keeley, C. D., A. Macario, W. B. F. Ryan, and, W. F. Haxby, (1995), Simulating seamount populations for the southern East Pacific Rise and the Pacific/Antarctic Ridge, Eos Trans. AGU, 76 (17), Spring Meet. Suppl., S273.
24. Kent, G. M., A. J. Harding, and, J. A. Orcutt, (1993), Distribution of magma beneath the East Pacific Rise between the Clipperton Transform and the 9°17′N Deval from forward modeling of common depth point data, J. Geophys. Res., 98, 13,945-13,969.
25. Kent, G. M., A. J. Harding, J. A. Orcutt, R. S. Detrick, J. C. Mutter, and, P. Buhl, (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.
26. Langmuir, C. H., (1988), Petrology Data Base, vol. 2 and 3, East Pacific Rise Data Synthesis Final Report, edited by, S. Tighe, Joint Oceanogr. Inst., Washington, D. C.
27. Langmuir, C. H., J. F. Bender, and, R. Batiza, (1986), Petrologic and tectonic segmentation of the East Pacific Rise, 5°30′N-14°30′N, Nature, 332, 422-429.
28. Langmuir, C. H., E. M. Klein, and, T. Plank, (1992), Petrological systematics of mid-ocean ridge basalts: Constraints on melt generation beneath ocean ridges, in Mantle Flow and Melt Generation at Mid-Ocean Ridges, Geophys. Monogr. Ser., vol. 71, edited by, J. Phipps Morgan, D. K. Blackman, and, J. M. Sinton, pp. 183-280, AGU, Washington, D. C.
29. Macdonald, K. C., S. P. Miller, B. P. Luyendyk, T. M. Atwater, and, L. Shure, (1983), Investigation of a Vine-Matthews magnetic lineation from a submersible: The source and character of marine magnetic anomalies, J. Geophys. Res., 88, 3403-3418.
30. Macdonald, K. C., P. J. Fox, R. T. Alexander, R. Pockalny, and, P. Gente, (1996), Volcanic growth faults and the origin of Pacific abyssal hills, Nature, 380, 125-129.
31. Monti, S., P. Gente, and, J.-P. Maze, (1987), Carte bathymetrique de la dorsale Est-Pacifique de 10° Nord a 14°30′ Nord, Inst. Fr. de Rech. pour l'Exploit. de la Mer, Brest, France.
32. Niu, Y., and, R. Batiza, (1991), An empricial method for calculating melt compositions produced beneath mid-ocean ridges: Application for axis and off-axis (seamounts) melting, J. Geophys. Res., 96, 21,753-21,777.
33. Niu, Y., and, R. Batiza, (1997), Trace element evidence from seamounts for recycled oceanic crust in the eastern Pacific mantle, Earth Planet. Sci. Lett., 148, 471-483.
34. Niu, Y., and, R. Batiza, (1998), Erratum to "Trace element evidence from seamounts for recycled oceanic crust in the eastern Pacific mantle,", Earth Planet. Sci. Lett., 155, 147.
35. Niu, Y., D. G. Waggoner, J. M. Sinton, and, J. J. Mahoney, (1996), Mantle source heterogeneity and melting processes beneath seafloor spreading centers: The East Pacific Rise, 18°-19°S, J. Geophys. Res., 101, 27,711-27,733.
36. Perfit, M. R., and, W. W. Chadwick Jr., (1998), Magmatism at mid-ocean ridges: Constraints from volcanological and geochemical investigations, in Faulting and Magmatism at Mid-Ocean Ridges, Geophys. Monogr. Ser., vol. 106, edited by, R. Buck, et al., pp. 59-115, AGU, Washington, D. C.
37. Perfit, M. R., D. J. Fornari, M. C. Smith, J. F. Bender, C. H. Langmuir, and, R. M. Haymon, (1994 a), Small-scale spatial and temporal variations in mid-ocean ridge crest magmatic processes, Geology, 22, 375-379.
38. Perfit, M. R., M. C. Smith, D. J. Fornari, M. H. Edwards, W. I. Ridley, S. J. Goldstein, J. F. Bender, and, R. M. Haymon, 1994 b), Detailed petrological and geochemical studies of on- and off-axis lavas from the East Pacific Rise: 9°30′N-10°N, Eos Trans., AGU, 75(44), Fall Meet. Suppl., 601.
39. Prinzhofer, A., E. Lewin, and, C. J. Allegre, (1989), Stochastic melting of the marble cake mantle: Evidence from local study of the East Pacific Rise at 12°50′N, Earth Planet. Sci. Lett., 92, 189-206.
40. Reynolds, J. R., (1995), Segment-scale systematics of mid-ocean ridge magmatism and geochemistry, Ph.D. dissertation, Columbia Univ., New York.
41. Reynolds, J. R., and, C. H. Langmuir, (1997), Petrological systematics of the Mid-Atlantic Ridge south of Kane: Implications for ocean crust formation, J. Geophys. Res., 102, 14,915-14,946.
42. Reynolds, J. R., C. H. Langmuir, J. F. Bender, K. A. Kastens, and, W. B. F. Ryan, (1992), Spatial and temporal variability in the geochemistry of basalts from the East Pacific Rise, Nature, 359, 493-499.
43. Scheirer, D. S., and, K. C. Macdonald, (1995), Near-axis seamounts on the flanks of the East Pacific Rise, 8°N to 17°N, J. Geophys. Res., 100, 2239-2259.
44. Sempere, J.-C., K. C. Macdonald, S. P. Miller, and, L. Shure, (1987), Detailed study of the Brunhes/Matuyama reversal boundary on the East Pacific Rise at 19°30′S: Implications for crustal emplacement processes at an ultra fast spreading center, Mar. Geophys. Res., 9, 1-23.
45. Sinton, J. M., S. M. Smaglik, J. J. Mahoney, and, K. C. Macdonald, (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.
46. Sours-Page, R., K. T. M. Johnson, R. L. Nielsen, and, J. L. Karsten, (1999), Local and regional variation of MORB parent magmas: Evidence from melt inclusions from the Endeavour Segment of the Juan de Fuca Ridge, Contrib. Mineral. Petrol., 134, 342-363.
47. Spiegelman, M., (1996), Geochemical consequences of melt transport in 2-D: The sensitivity of trace elements to mantle dynamics, Earth Planet. Sci. Lett., 139, 115-132.
48. Spiegelman, M., and, J. R. Reynolds, (1999), Combined dynamic and geochemical evidence for convergent melt flow beneath the East Pacific Rise, Nature, 402, 282-285.
49. Weaver, J. S., and, C. H. Langmuir, (1990), Calculation of phase equilibrium in mineral-melt systems, Comput. Geosci., 16, 1-19.
50. Wilcock, W. S. D., S. C. Solomon, G. M. Purdy, and, D. R. Toomey, (1995), Seismic attenuation structure of the East Pacific Rise near 9°30′N, J. Geophys. Res., 100, 24,147-24,165.
51. Wilson, D. S., (1992), Focused mantle upwelling beneath mid-ocean ridges: Evidence from seamount formation and isostatic compensation of topography, Earth Planet. Sci. Lett., 113, 41-55.
52. Zindler, A., H. Staudigel, and, R. Batiza, (1984), Isotope and trace element geochemistry of young Pacific seamounts: Implications for the scale of upper mantle heterogeneity, Earth Planet. Sci. Lett., 70, 175-195.