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- W2063525029 abstract "Abstract data from two deep‐penetration electrical resistivity surveys crossing the western margin of the Taupo Volcanic Zone (TVZ) near Tihoi, northwest of lake Taupo, North Island, New Zealand, have been used to identify the elements of the margin. In this vicinity the volcanologically defined boundary of the TVZ includes the andesitic cones of Pureora and Titiraupenga. The faulted margin of the TVZ lies east of these cones and is marked in the resistivity data by a dipping interface (faulted margin) between the resistive greywacke rocks to the west and the relatively conductive volcanic rocks that fill the upper few kilometres of the TVZ. The resistivity and gravity signatures of the margin are coincident in this vicinity. To the immediate east of the margin is a low‐resistivity zone c. 10 km wide and 2.5 km deep. The low‐resistivity material within this region is identified as old (>1 Ma) volcaniclastics that contain clays produced by low‐temperature alteration and devitrification. This material is reversely magnetised. We suggest that this zone was formed following the onset of active extension of the TVZ and has since remained relatively undisturbed while the focus of volcanism and deformation has moved to the east. The eastern boundary of this low‐resistivity zone coincides with the western edge of the whakamaru caldera (the boundary of the “young TVZ). Although the resistivity data can be matched using an interface with a dip to either the east or west, an eastward dip would be consistent with the boundary having been formed during the collapse associated with the formation of the Whakamaru caldera. The resistivity signature within the Whakamaru caldera is consistent with >2 km thickness of younger, more resistive volcanic sequences, suggesting the low‐resistivity layers found to the west have been disrupted and downfaulted to be replaced with young, resistive caldera infill." @default.
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- W2063525029 date "2008-09-01" @default.
- W2063525029 modified "2023-09-26" @default.
- W2063525029 title "Resistivity structure of western Taupo Volcanic Zone, New Zealand" @default.
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- W2063525029 doi "https://doi.org/10.1080/00288300809509862" @default.
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