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Deep electrical structure of the Central Volcanic Region and Taupo Volcanic Zone, New Zealand

Earth, Planets and Space volume 57, pages 591–603 (2005)Cite this article

Abstract

Magnetotelluric measurements have been made along a transect crossing the Central Volcanic Region (CVR) and Taupo Volcanic Zone (TVZ) of the North Island of New Zealand. Analysis of the observed data using the phase tensor method shows that at the south-eastern end of the transect, where it crosses the TVZ, the data are largely 2-dimensional in character and respond to electrical structure which has a strike orientation of N45°E. There is however, evidence of some degree of 3-dimensionality in data from the central part of the TVZ. 2-dimensional inversion and forward modelling of data indicate the existence of low resistivity beneath about 10 km depth centred below the Taupo Fault Belt. The existence of low resistivity beneath this depth is consistent with a low velocity zone identified from receiver function analysis and with measurements of the transition from brittle to ductile behaviour and the depth penetration of the convective systems associated with the geothermal fields within the TVZ. The low resistivity provides support for the existence of igneous intrusion to shallow depths beneath the TVZ. Data from the north-western end of the transect, where it crosses the western boundary of the CVR, are 2-dimensional and may respond to electrical structure associated with the Hauraki Rift, an active rift containing Tertiary sediments, which cuts the boundary of the CVR in this region.

References

  • Bahr, K., Interpretation of the magnetotelluric impedance tensor: Regional induction and local telluric distortion, J. Geophys., 62, 119–127, 1988.

    Google Scholar 

  • Bahr, K., Geological noise in magnetotelluric data: A classification of distortion types, Phys. Earth Planet. Int., 66, 24–38, 1991.

    Article  Google Scholar 

  • Bannister, S. C. and A. Melhuish, Seismic scattering and reverberation, Kaingaroa Plateau, Taupo Volcanic Zone, New Zealand, N. Z. Jl. Geol. Geophys., 40, 375–381, 1997.

    Article  Google Scholar 

  • Bannister, S., C. J. Bryan, and H. M. Bibby, Shear wave velocity variation across the Taupo Volcanic Zone, New Zealand, from receiver function inversion, Geophys. J. Int., 159, 291–310, 2004.

    Article  Google Scholar 

  • Bibby, H. M., Analysis of multi-source bipole-dipole resistivity surveys using the apparent resistivity tensor, Geophysics, 51, 972–983, 1986.

    Article  Google Scholar 

  • Bibby, H. M., Electrical resistivity mapping in the central volcanic region of New Zealand, N. Z. Jl. Geol. Geophys., 31, 259–274, 1988.

    Article  Google Scholar 

  • Bibby, H. M., T. G. Caldwell, F. J. Davey, and T. H. Webb, Geophysical evidence on the structure of the Taupo Volcanic Zone and its hydrothermal circulation, J. Volcanol. Geotherm. Res., 68, 29–58, 1995.

    Article  Google Scholar 

  • Bibby, H. M., T. G. Caldwell, and G. F. Risk, Electrical resistivity image of the upper crust within the Taupo Volcanic Zone, New Zealand, J. Geophys. Res., 103, 9665–9680, 1998.

    Article  Google Scholar 

  • Bryan, C. J., S. Sherburn, H. M. Bibby, S. C. Bannister, and A. W. Hurst, Shallow seismicity of the central Taupo Volcanic Zone, New Zealand: its distribution and nature, N. Z. Jl. Geol. Geophys., 42, 533–542, 1999.

    Article  Google Scholar 

  • Caldwell, T. G., H. M. Bibby, and C. Brown, The magnetotelluric phase tensor, Geophys. J. Int., 158, 457–469, 2004.

    Article  Google Scholar 

  • Chave, A. D. and J. T. Smith, On electric and magnetic galvanic distortion tensor decompositions, J. Geophys. Res., 99, 4669–4682, 1994.

    Article  Google Scholar 

  • Cole, J. W., Structural control and origin of volcanism in the Taupo Volcanic Zone, New Zealand, Bulletin ofVolcanology, 52, 445–459, 1990.

    Article  Google Scholar 

  • Gamble, T. D., W. M. Goubou, and J. Clarke, Magnetotellurics with a remote reference, Geophysics, 44, 53–68, 1979.

    Article  Google Scholar 

  • Giggenbach, W. F., Variations in the chemical and isotopic composition of fluids discharged in the Taupo Volcanic Zone, New Zealand, J. Volcanol. Geotherm. Res., 68, 89–116, 1995.

    Article  Google Scholar 

  • Groom, R. W. and R. C. Bailey, Decomposition of the magnetotelluric impedance tensor in the presence of local three-dimensional galvanic distortion, J. Geophys.Res., 94, 1913–1925, 1989.

    Article  Google Scholar 

  • Groom, R. W., R. D. Kurtz, A. G. Jones, and D. E. Boerner, A quantitative methodology to extract regional magnetotelluric impedances and determine the dimension of the conductivity structure, Geophys. J. Int., 115, 1095–1118, 1993.

    Article  Google Scholar 

  • Hashin, Z. and A. Shtrikman, A variational approach to the theory of effective magnetic permeability of multiphase materials, J. Appl. Phys., 33, 3125–3131, 1962.

    Article  Google Scholar 

  • Hatherton, T., Basement surface west of Lake Taupo, Geophysics Division, DSIR, report 90, 1974.

    Google Scholar 

  • Hochstein, M. P. and I. M. Nixon, Geophysical study of the Hauraki Depression, North Island, New Zealand, N. Z. Jl. Geol. Geophys., 22, 1–19, 1979.

    Article  Google Scholar 

  • Hochstein, M. P., I. E. M. Smith, K. Regenauer-Lieb, and S. Ehara, Geochemistry and heat transfer processes in Quaternary rhyolitic systems of the Taupo Volcanic Zone, New Zealand, Tectonophysics, 223, 213–235, 1993.

    Article  Google Scholar 

  • Hoffman, S. D. and M. K. Savage, Seismic anisotropy of the crust and upper mantle on the western edge of the Central Volcanic Region, North Island, New Zealand, Eos. Trans. AGU, 83(22), West. Pac. Geophys. Meet. Suppl., Abstract SE32A-04, 2002.

    Google Scholar 

  • Horgan, H., G. Lamarche, and T. Stern, Constraining extensional tectonic structures in a back-arc environment using geopotential and multi-channel seismic data—the offshore Bay of Plenty, New Zealand, Eos. Trans. AGU, 83(22), West. Pac. Geophys. Meet. Suppl., Abstract SE22C-02, 2002.

    Google Scholar 

  • Horgan, H., G. Lamarche, and T. Stern, Constraints on the thermal and crustal structure of the offshore Central Volcanic Region, New Zealand, New Zealand Geophysical Society Symposium, Wellington, New Zealand, 1–2 September, 2003.

    Google Scholar 

  • Ingham, M., Electrical conductivity structure of the eastern margin of the Central Volcanic Region, Proc. 12th NZ Geothermal Workshop, 77–81, 1990.

    Google Scholar 

  • Ingham, M., Electrical conductivity structure of the Broadlands-Ohaaki geothermal field, New Zealand, Phys. Earth Planet. Int., 66, 62–75, 1991.

    Article  Google Scholar 

  • Ingham, M., Numerical modelling of magnetotelluric soundings from the central Volcanic Region, Proc. 13th NZ Geothermal Workshop, 15–19, 1992.

    Google Scholar 

  • Ingham, M., K. Whaler, and D. McKnight, Magnetotelluric sounding of the Hikurangi Margin, New Zealand, Geophys. J. Int., 144, 343–355, 2001.

    Article  Google Scholar 

  • Lilley, F. E. M., Magnetotelluric tensor decomposition: 1. Theory for a basic procedure, Geophysics, 63, 1885–1897, 1998a.

    Article  Google Scholar 

  • Lilley, F. E. M., Magnetotelluric tensor decomposition: 2. Examples of a basic procedure, Geophysics, 63, 1898–1907, 1998b.

    Article  Google Scholar 

  • McLoughlin, C., M. Ingham, C. Whaler, and D. McKnight, A magnetotelluric transect of the Wairarapa region, New Zealand, N. Z. Jl. Geol. Geophys., 45, 257–269, 2002.

    Article  Google Scholar 

  • McNeice, G. W. and A. G. Jones, Multisite, multifrequency tensor decomposition of magnetotelluric data, Geophysics, 66, 158–173, 2001.

    Article  Google Scholar 

  • Müller, A. and V. Haak, 3-D modeling of the deep electrical conductivity of Merapi volcano (Central Java): integrating magnetotellurics, induction vectors and the effect of steep topography, J. Volcan. Geotherm. Res., Germany, 138, 205–222, 2004.

    Article  Google Scholar 

  • Ogawa, Y., H. M. Bibby, T. G. Caldwell, S. Takakura, N. Matsushima, S. L. Bennie, T. Tosha, Y. Nishi, Wide-band magnetotelluric measurements across the Taupo volcanic zone: preliminary results, Geophys. Res. Lett., 26, 3673–3676, 1999.

    Article  Google Scholar 

  • Ranganayaki, R. P., The interpretive analysis of magnetotelluric data, Geophysics, 49, 1730–1748, 1984.

    Article  Google Scholar 

  • Reyners, M., D. Eberhart-Phillips, and G. Stuart, Seismic tomography in the central North Island—a progress report from CNIPSE. New Zealand Geophysical Society Symposium, Wellington, New Zealand, 1–2 September, 2003.

    Google Scholar 

  • Risk, G. F., H. M. Bibby, and T. G. Caldwell, Dc resistivity mapping with the multiple-source bipole-dipole method in the Central Volcanic Region, New Zealand, J. Geomag. Geoelectr., 45, 897–916, 1993.

    Article  Google Scholar 

  • Risk, G. F., T. G. Caldwell, and H. M. Bibby, Deep resistivity surveys in the Waiotapu-Waikite-Reporoa region, New Zealand, Geothermics, 23, 423–443, 1994.

    Article  Google Scholar 

  • Robinson, R. E., E. G. C. Smith, and J. H. Latter, Seismic studies of the crust under the hydrothermal areas of the Taupo Volcanic Zone, New Zealand, J. Volcanol. Geotherm. Res., 9, 253–267, 1981.

    Article  Google Scholar 

  • Smith, J. T., Understanding telluric distortion matrices, Geophys. J. Int., 122, 219–226, 1995.

    Article  Google Scholar 

  • Smith, J. T. and J. R. Booker, Rapid inversion of two- and three-dimensional magnetotelluric data, J. Geophys. Res., 96, 1168–1171, 1991.

    Google Scholar 

  • Stagpoole, V. M., Interpretation of refraction seismic and gravity data across the eastern margin of the Taupo Volcanic Zone, New Zealand, Geothermics, 23, 501–510, 1994.

    Article  Google Scholar 

  • Stern, T. A., A back-arc basin formed within continental lithosphere: the central Volcanic Region of New Zealand, Tectonophysics, 112, 385–409, 1985.

    Article  Google Scholar 

  • Stern, T. A., Asymmetric back-arc spreading, heat-flux and structure associated with the Central Volcanic Region of New Zealand, Earth Planet. Sci. Lett., 85, 265–276, 1987.

    Article  Google Scholar 

  • Stern, T. A. and F. J. Davey, Crustal structure studies with the central North Island: The Central Volcanic Region, Report 207, Geophysics Division, DSIR, Wellington, 47 pp, 1985.

    Google Scholar 

  • Stern, T. A. and F. J. Davey, A seismic investigation of the crustal and upper mantle structure within the Central Volcanic Region of New Zealand, N. Z. Jl. Geol. Geophys., 30, 217–231, 1987.

    Article  Google Scholar 

  • Stratford, W. R. and T. A. Stern, Strong seismic reflections and melts in the mantle of a continental back-arc basin, Geophys. Res. Lett., 31, doi:10.1029/2003GL019232, 2004.

  • Stratford, W. R., T. A. Stern, and the North Island Geophysical Transect (NIGHT) working group, Crust and upper mantle structure in continental bark-arc spreading zone: Central North Island, New Zealand, Eos. Trans. AGU, 83(22), West. Pac. Geophys. Meet. Suppl., Abstract SE32B-05, 2002.

    Google Scholar 

  • Wilson, C. J. N., A. M. Rogan, I. E. M. Smith, D. J. Northey, I. A. Nairn, and B. F. Houghton, Caldera volcanoes of the Taupo Volcanic Zone, New Zealand, J. Geophys. Res., 89, 8463–8484, 1984.

    Article  Google Scholar 

  • Wilson, C. J. N., B. F. Houghton, M. D. McWilliams, S. D. Lanphere, S. D. Weaver, and R. M. Briggs, Volcanic and structural evolution of Taupo Volcanic Zone, New Zealand: a review, J. Volcanol. Geotherm. Res., 68, 1–28, 1995.

    Article  Google Scholar 

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  1. School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand

    Malcolm Ingham

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Ingham, M. Deep electrical structure of the Central Volcanic Region and Taupo Volcanic Zone, New Zealand. Earth Planet Sp 57, 591–603 (2005). https://doi.org/10.1186/BF03351838

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