Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Total Field Magnetic Analysis of Nine Seamounts Northwest of the Marshall Islands, Western Pacific

  • Published : 2002.09.30
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Abstract

Total magnetic field and high-resolution bathymetric data were collected over nine seamounts to the northwest of the Marshall Islands in the western Pacific. Magnetic parameters including inclination and declination were calculated from the magnetic anomalies using inversion algorithm of Plouff (1976), and a corresponding paleomagnetic pole was determined with the magnetic parameters. The paleomagnetic poles determined in this study were compared with the previous apparent polar wander path (APWP) of Pacific plate. Most seamounts of the study area have normal polarity. The study reveals that all nine seamounts in the study area formed in the southern hemisphere during the Cretaceous based on their comparison with the APWP of Pacific plate. The ages estimated from paleomagnetic poles can be divided by age into three groups: the oldest (OSM1 and OSM3), middle age (OSM2, OSM4, and 6-2), and the youngest (OSM5-1, 5-2, 5-3, and 6-1). The fermer two groups and the latter seem to be coincident with two distinct pulses of Cretaceous volcanic activity (115-90 Ma and 83-65 Ma). As a whole the seamounts at southwest of the study area are older than at those northeast.

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References

  1. Gordon, R.G. 1983. Late Cretaceous apparent polar wander path of the Pacific plate: Evidence of a rapid shift of the Pacific hotspots with respect to the paleomagnetic axis. Geophys. Res. Lett., 10, 709-712. https://doi.org/10.1029/GL010i008p00709
  2. Harrison, C.G.A., R.D. Jarrard, V. Vacquier, and R.L. Larson. 1975. Paleomagnetism of Cretaceous Pacific seamounts. Geophys. J. R. Astron. Soc., 42, 859-882.
  3. Heezen B.C., I.D. MacGregor, H.P. Foreman, G. Forristall, H. Hekel, R. Hesse, R.H. Hoskins, E.J.W. Jones, A. Kaneps, V.A. Krasheninnikov, H. Okada, and M.H. Ruef. 1973a. Mesozoic chalks beneath the Caroline abyssal plain: DSDP Site 199. Initial Rep. Deep Sea Drill. Proj., 20, 65-86.
  4. Heezen, B.C., I.D. MacGregor, H.P. Foreman, G. Forristall, H. Hekel, R. Hesse, R.H. Hoskins, E.J.W. Jones, A. Kaneps, V.A. Krasheninnikov, H. Okada, and M.H. Ruef. 1973b. Tertiary pelagic ooze on Ita Maitai guyot, equatorial Pacific DSDP Sites 200 and 201. Initial Rep. Deep Sea Drill. Proj., 20, 87-96.
  5. Heezen, B.C., I.D. MacGregor, H.P. Foreman, G. Forristall, H. Hekel, R. Hesse, R.H. Hoskins, E.J.W. Jones, A. Kaneps, V.A. Krasheninnikov, H. Okada, and M.H. Ruef. 1973c. Oolitic limestone on the Ita Maitai guyot, Equatorial Pacific: DSDP Site 202. Initial Rep. Deep Sea Drill. Proj., 20, 97-102.
  6. Heezen, B.C., J.L. Matthews, R. Catalano, J. Natland, A. Coogan, M. Tharp, and M. Rawson. 1973d. Western Pacific guyots. Initial Rep. Deep Sea Drill. Proj., 20, 653-723.
  7. Irving, E. 1956. Paleomagnetic and paleoclimatological aspects of polar wandering. Geofis. Pura. Appl., 33, 23-41. https://doi.org/10.1007/BF02629944
  8. Koppers, A.A.P., H. Staudigel, J.R. Wijbrans, and M.S. Pringle. 1998. The Magellan seamount trail: Implications for Cretaceous hotspot volcanism and absolute Pacific plate motion. Earth Planet. Sci. Lett., 163, 53-68. https://doi.org/10.1016/S0012-821X(98)00175-7
  9. Lee, T.G., S.M. Lee, and J.W. Moon. 2001. Magnetic anomaly analysis of two adjacent seamounts (Ita Mai Tai and OSM2) in the western Pacific. J. Geol. Soc. Korea, 37, 587-596.
  10. Lincoln, J.M., M.S. Pringle, and I.P. Silva. 1993. Early and Late Cretaceous Volcanism and Reef-Building in the Marshall Islands. p. 279-305. In: The Mesozoic Pacific: Geology, Tectonics, and Volcanism, eds. by M.S. Pringle, W.W. Sager, W.V. Silter, and S. Stein. American Geophysical Union.
  11. Merrill, R.T., M.W. EcElhinny, and P.L. McFadden. 1998. The Magnetic Field of the Earth. Academic Press, San Diego, 631 p.
  12. Nakanishi, M., K. Tamaki, and K. Kobayashi. 1989. Mesozoic magnetic anomaly lineations and seafloor spreading history of the northwestern Pacific. J. Geophys. Res., 94, 15437-15462. https://doi.org/10.1029/JB094iB11p15437
  13. Nakanishi, M. and E.L. Winterer. 1998. Tectonic history of the Pacific-Farallon-Phoenix triple junction from Late Jurassic to Early Cretaceous: An abandoned Mesozoic spreading system in the Central Pacific Basin. J. Geohpys. Res., 103, B6, 12453-12468. https://doi.org/10.1029/98JB00754
  14. Plouff, D. 1976. Gravity and magnetic fields of polygonal prisms and application to magnetic terrain corrections. Geophysics, 41, 727-741. https://doi.org/10.1190/1.1440645
  15. Rea, D.K. and T.L. Vallier. 1983. Two Cretaceous volcanic episodes in the western Pacific Ocean. Geol. Soc. Am. Bull., 94, 1430-1437. https://doi.org/10.1130/0016-7606(1983)94<1430:TCVEIT>2.0.CO;2
  16. Richards, M.L., V. Vacquier, and G.D. van Voorhis. 1967. Calculation of the magnetization of uplifts from combining topographic and magnetic surveys. Geophysics, 32, 678-707. https://doi.org/10.1190/1.1439883
  17. Sager, W.W. 1983. Seamount paleomagnetism and Pacific plate tectonics. Ph.D. Thesis, Univ. Hawaii. Honolulu. 472 p.
  18. Sager, W.W. and M.S. Pringle. 1988. Mid-Cretaceous to early Tertiary apparent polar wander path of the Pacific plate. J. Geophys. Res., 93, 11753-11771. https://doi.org/10.1029/JB093iB10p11753
  19. Schlanger, S.O., H.C. Jenkyns, and I. Premoli-Silva. 1981. Volcanism and vertical tectonics in the Pacific Basin related to global Cretaceous transgressions. Earth Planet. Sci. Lett., 52, 435-449. https://doi.org/10.1016/0012-821X(81)90196-5
  20. Schlanger, S.O. and I. Premoli-Silva. 1981. Tectonic, volcanic, and paleogeographic implications of redeposited reef faunas of Late Cretaceous and Tertiary age from the Nauru Basin and the Line Islands. Initial Rep. Deep Sea Drill. Proj., 61, 817-827.
  21. Smith, W.H.F., H. Staudigel, A.B. Watts, and M.S. Pringle. 1989. The Magellan Seamounts: Early Cretaceous Record of the South Pacific Isotopic and Thermal Anomaly. J. Geophys. Res., 94, 10501-10523. https://doi.org/10.1029/JB094iB08p10501
  22. Talwani, M. 1965. Compuation with the help of a digital computer of magnetic anomalies caused by bodies of arbitrary shape. Geophysics, 30, 797-817. https://doi.org/10.1190/1.1439654
  23. Tamaki, K., K. Nakanishi, K. Sayanagi, and K. Kobayashi. 1987. Jurassic magnetic anomaly lineations of the Western Pacific and the origin of the Pacific plate. EOS, Trans. AGU, 68, 1493.
  24. Tarduno, J.A. and W.W. Sager. 1995. Polar Standstill of the Mid-Cretaceous Pacific Plate and Its Geodynamic Implications. Science, 269, 956-959. https://doi.org/10.1126/science.269.5226.956
  25. van Waasbergen, R.J. and E.L. Winterer. 1993. Summit Geomorphology of Western Pacific Guyots. p. 335-366. In: The Mesozoic Pacific: Geology, Tectonics, and Volcanism, eds. by M.S. Pringle, W.W. Sager, W.V. Silter, and S. Stein. American Geophysical Union.
  26. Wedgeworth, B. and J. Kellogg. 1987. A 3-D gravity-tectonic study of Ita Mai Tai guyot: an uncompensated seamount in the East Mariana Basin. p. 25-34. In: Seamounts, Islands and Atolls, eds. by B.H. Keating, P. Fryer, R. Batiza, and G.W. Boehlen. American Geophysical Union.
  27. Winterer, E.L. 1976. Bathymetry and regional tectonic setting of the Line Islands Chain. Initial Rep. Deep Sea Drill. Proj., 33, 731-748.