A geophysical study of the Westport, Inangahua and Murchison Basins, West

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Anderson, H.J. 1979 A geophysical study of the Westport, Inangahua and Murchison Basins, West. [s.l.]: [s.n.]. Report / Geophysics Division 148 53 p

Abstract: Existing gravity and some seismic data for the Westport, Inangahua and Murchison basins have been collated and interpreted. Additional gravity measurements were made in critical areas. Gravity anomalies and offshore seismic data indicate that the Westport basin consists of a minor sedimentary basin to the south and a larger northward plunging syncline to the north, which are separated by a basement ridge. The southern basin is at least 1200 m deep and the northern basin contains at least 2400 m of sediment at its deepest point. The Inangahua basin is fault bounded and the maximum thickness of sediments preserved there is about 1400 m. North of Rotokohu, the Inangahua basin is structurall different than to the south and probably has a thinner sequence of sediments than that preserved to the south. The Murchison basin contains abnormally dense Tertiary rocks which have been extensively faulted and folded. Gravity data indicate that the deepest parts of the basin are near the centre and in places near the eastern boundary. The minimum thickness of sediments preserved in the deepest parts of this basin is 3700 m