The geology and structure of Mernoo Bank and surrounding area, western Chatham Rise

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Herzer, R.H.; Wood, R.A. 1988 The geology and structure of Mernoo Bank and surrounding area, western Chatham Rise. Lower Hutt: New Zealand Geological Survey. Record / New Zealand Geological Survey 29 22 p.

Abstract: Interpretation of seismic reflection data and bottom samples from a portion of western Chatham Rise in the area of Mernoo Bank reveals that the area is underlain by a basement of Mesozoic Torlesse Supergroup rocks cut by fault- angle basins containing sediments of Late Cretaceous and Eocene age. Early Tertiary to Recent sediments are draped over the rise; they thin across the crest and are absent locally from Mernoo Bank. Mernoo Bank itself was formed by uplift either in Eocene or Neogene time, most probably early Neogene. Erosion, which would have included wave attack during the Pleistocene, has exposed basement greywacke and probably Upper Cretaceous and Lower Tertiary sediments on the bank's more rugged eastern half, but has not fully removed the Neogene sedimentary cover from its smooth and gently shelving western half. Magnetic anomalies indicate that some volcanics are likely to occur as well. On the north slope of the Chatham Rise, immediately adjacent to Mernoo Bank, a province of young faults may be related to the doming of the bank. A geological map, derived from seismic interpretation, appears to satisfactorily explain some of the bathymetric features. (auth.)

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