Browse > Article

The Study of Hydrothermal Vent and Ocean Crustal Structure of Northeastern Lau Basin Using Deep-tow and Surface-tow Magnetic Data  

Kwak, Joon-Young (Department of Earth System Sciences, Yonsei University)
Won, Joong-Sun (Department of Earth System Sciences, Yonsei University)
Park, Chan-Hong (Korea Ocean Research and Development Institute)
Kim, Chang-Hwan (Korea Ocean Research and Development Institute)
Ko, Young-Tak (Korea Ocean Research and Development Institute)
Publication Information
Economic and Environmental Geology / v.41, no.1, 2008 , pp. 81-92 More about this Journal
Abstract
Fonualei Rift and Spreading Center(FRSC) and Mangatolu Triple function(MTJ) caldera are located in northeastern part of Lau basin which is the active back-arc basin. Deep-tow and surface-tow magnetic surveys are carried out in FRSC. In deep-tow magnetic survey, to compensate for influence of uneven distance between bathymetry and sensor height, magnetic anomaly is continued upward to a level plane by using the Guspi method. We calculate crustal magnetization using Parker and Huestis's inversion algorithm, and try to find the hydrothermal vent and understand the structure of ocean floor crust. The result of deep-tow magnetic survey at FRSC showed that Central Anomaly Magnetization High(CAMH) recorded the max value of 4.5 A/m which is associated with active ridge. The direction of SSW-NNE corresponds with the direction of the principal spreading ridge in Lau basin. The low crustal magnetizaton$(174^{\circ}35.1 of -4.0 A/m is supposed to correlate with submarine hydrothermal vent. Surface-tow magnetic data were collected in MTJ caldera$(174^{\circ}00. The prevailing SSW-NNE direction of collapsing walls and the presence of CAMH at the center of caldera strongly indicate the existence of active spreading ridge in ancient times.
Keywords
Lau basin; Magnetization; Hydrothermal vent; Spreading ridge;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Baker, E.T., Resing, J.A., Walker, S.L., Martinez, F., Taylor, B. and Nakamura, K. (2006) Abundant hydrothermal venting along melt-rich and melt-free ridge segments in the Lau back-arc basin. Geophys. Res. Lett., v. 33, L07308, doi:10.1029/2005GL025283   DOI   ScienceOn
2 Cande, S.C., LaBreque, J.L. and McCamy, K. (1973) Application of linear filtering to marine magnetic anomalies: Paleo-poles and ridge crest processes. EOS Trans. AGU., 54, 252
3 Fouquet, Y., Stackelberg, U.V., Charlou, J.L., Donval, J.P., Foucher, J.P., Erzinger, J., Herzig, P., Muehe, R., Wiedicke, M., Soaka,i S. and Whitechurch, H. (1991) Hydrothermal activity in the Lau back-arc basin: Sulfides and water chemistry. Geology, v. 19, p. 303-306   DOI
4 German, C.R., Baker, E.T., Connelly, D.P., Lupton, J.E., Resing, J.A., Prien, R.D., Walker, S.L., Edmonds, H.N. and Langmuir, C.H. (2006) Hydrothermal exploration of the Fonualei rift and spreading center and the northeast Lau spreading center. Geochem. Geophys. Geosyst., v. 7, no. 11, ISSN:1525-2027
5 Morgan, P.J. and Chen, Y.J. (1993) The genesis of oceanic crust: Magma injection, hydrothermal circulation, and crustal flow. J. Geophys. Res., v. 98, p. 6283-6297   DOI
6 Zellmer, K. and Taylor, B. (2001) A three-plate kinematic model for Lau Basin opening. Geochem. Geophys. Geosyst., v. 2, 200GC000106, ISSN: 1525-2027
7 Taylor, B., Zellmer, K., Martinez, F. and Goodlife, A.M. (1996) Seafloor spreading in the Lau back-arc basin. Earth Planet. Sci. Lett., v. 144, p. 35-40   DOI   ScienceOn
8 Martinez, F., Taylor, B., Baker, E.T., Resing, J.A. and Walker, S.L. (2006) Opossing trends in crustal thickness and spreading rate along the back-arc Eastern Lau Spreading Center: Implications for controls on ridge morphology, faulting, and hydrothermal activity. Earth Planet. Sci. Lett., v. 245, p. 655-672   DOI   ScienceOn
9 Bloomer, S.H., Wright, D.J. and Boomerang LEG 8 Shipboard Scientific Party (1996) Geology of the Tonga Forearc: A supra-subduction zone ophiolite. EOS Trans. AGU., 77, F325   DOI
10 Gee, J. and Kent, D. (1994) Variation in layer 2A thickness and the origin of the central anomaly magnetic high. Geophys. Res. Lett., v. 21, no. 4, p. 297-300   DOI
11 Schouten, H., Tivey, M.A., Fornari, D.J. and Cochran, J.R. (1999) Central anomaly magnetization high: constraints on the volcanic construction and architecture of seismic layer 2A at a fast-spreading mid-ocean ridge, the EPR at $9^{circ}$30'-50'N. Earth Planet. Sci. Lett., v. 169, p. 37-50   DOI   ScienceOn
12 Smith, D.K., Tivey, M.A., Schouten, H. and Cann, J.R. (1999) Locating the spreading axis along 80 km of the Mid-Atlantic Ridge south of the Atlantis Transform. J. Geophys. Res., v. 104, p. 7599-7612   DOI
13 Tivey, M.A. and Schouten, H. (2003) A near-bottom magnetic survey of the Mid-Atlantic Ridge axis at $26^{\circ}N$: Implications for the tectonic evolution of the TAG segment. J. Geophys. Res., v. 108, no. B5, 2277, doi:10.1029/2002JB001967   DOI
14 Maus, S. and Haak, V. (2003) Magnetic field annihilators: invisible magnetization at the magnetic equator. Geophys. J. Int., v. 155, p. 509-513   DOI   ScienceOn
15 Currie, R.G. and Davis, E.E. (1994) Low crustal magnetization of the middle valley sedimented rift inferred from sea-surface magnetic anomalies. Proceeeding of the ODP, Scientific Result, v. 139
16 Wright, D.J., Bloomer, S.H., Macleod, C.J., Taylor, B. and Goodlife, A.M. (2000) Bathymetry of the Tonga Trench and Forearc: a map series. Marine Geophysical Researches, v. 21, p. 489-511   DOI   ScienceOn
17 Guspi, F. (1987) Frequency-domain reduction of potential field measurements to a horizontal plane. Geoexploration, v. 24, p. 11-19
18 Tivey, M.A. and Johnson, H.P. (2002) Crustal magnetization reveals subsurface structure of Juan de Fuca Ridge hydrothermal vent field. Geological Society of America, v. 30, no. 11, p. 979-982
19 Parker, R.L. and Huestis, S.P. (1974) The inversion of magnetic anomalies in the presence of topography, J. Geophys. Res., v. 79, p. 1587-1594   DOI