Lithified Sediments Dredged from the Central North Fiji Basin

  • Murray R. Gregory
  • James V. Eade
Part of the Circum-Pacific Council for Energy and Mineral Resources Earth Science Series book series (CIRCUM-PACIFIC, volume 15)

Abstract

Sedimentary rocks dredged from the seafloor in the north-central part of the North Fiji Basin at depths of 3000 m to 4500 m comprise a mixed volcanogenic and calcareous biogenic assemblage. Ages range from late Miocene to Pleistocene and are compatible with those established from magnetic data for the underlying oceanic crust which they veneer. There is no significant compaction of sediments, and lithification has occurred as a response to periodic stiff ground formation associated with depositional hiatuses or minor erosional episodes. Lithification has been diagenetically enhanced through alteration of glassy components to smectite and zeolite. The finer volcanogenic detritus of earliest sediments accumulating in this back-arc basin are mostly arc-derived, supplemented by slide- or slump-emplaced coarser epiclastic detritus with mid-ocean ridge basalt (MORB) affinities and of local origin. On the local scale sedimentation patterns and processes are complex. Although Mn encrustation of surfaces exposed on the seafloor is widespread, no shows of polymetallic sulfide deposits were encountered in the sedimentary rocks studied.

Keywords

Dust Sulfide Lithification Sandstone Sedimentation 

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Copyright information

© Circum-Pacific Council for Energy and Mineral Resources 1994

Authors and Affiliations

  • Murray R. Gregory
    • 1
  • James V. Eade
    • 2
  1. 1.Geology DepartmentUniversity of AucklandAucklandNew Zealand
  2. 2.New Zealand Oceanographic InstituteWellingtonNew Zealand

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