Rates and Magnitudes of Late Cenozoic Vertical Movements in the Indonesian Banda Arc and the Distinction of Eustatic Effects

  1. David I. M. Macdonald
  1. A. R. Fortuin and
  2. M. E. M. de Smet

Published Online: 14 APR 2009

DOI: 10.1002/9781444303896.ch4

Sedimentation, Tectonics and Eustasy: Sea-Level Changes at Active Margins

Sedimentation, Tectonics and Eustasy: Sea-Level Changes at Active Margins

How to Cite

Fortuin, A. R. and de Smet, M. E. M. (1991) Rates and Magnitudes of Late Cenozoic Vertical Movements in the Indonesian Banda Arc and the Distinction of Eustatic Effects, in Sedimentation, Tectonics and Eustasy: Sea-Level Changes at Active Margins (ed D. I. M. Macdonald), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303896.ch4

Editor Information

  1. British Antarctic Survey, Cambridge, UK

Author Information

  1. Geomarine Centre Amsterdam, Institute of Earth Sciences, Free University, P.O. Box 7161, 1007 MC Amsterdam, The Netherlands

  1. University of London, Geol. Dept. Royal Holloway and Bedford New College, Egham Hill, Surrey, UK

Publication History

  1. Published Online: 14 APR 2009
  2. Published Print: 13 JUN 1991

ISBN Information

Print ISBN: 9780632030170

Online ISBN: 9781444303896

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Keywords:

  • rates and magnitudes of late cenozoic vertical movements in Indonesian Banda arc and distinction of eustatic effects;
  • vertical movement reconstruction;
  • Pleistocene antiform uplift movements in southwest Seram;
  • tectonics and eustatics compared;
  • vertical movements in Banda Arc - tilting processes and open folding on scale of tens of kilometres;
  • time and space interplay of tectonics and tectonic-related sediment supply

Summary

Rates and magnitudes of late Cenozoic vertical movements in various sections of Banda Arc islands were calculated using the geohistory analysis technique. Short periods of uplift alternated with longer intervals of tectonic rest or subsidence. Sections with a high time-stratigraphic resolution show pulses of uplift with a duration between 0.1 and 1 Ma, and rates exceeding 5 m/ka. Such movements are of similar frequency to eustatic third-order sea-level changes, but an order of magnitude larger in vertical extent, and will therefore determine major unconformities (sequence boundaries) in tectonically unstable areas, such as continent–arc collision zones. Moreover, the spasmodic behavior of tectonic movements, especially when shorter intervals of time are considered (on a scale of thousands of years), will cause local perturbations of the depositional sequences with regard to the eustatic cycle. Owing to this tectonic overprinting the eustatic signal will be difficult to disentangle from the tectonic signal, and the predictive value of seismic sequence analysis of sediments deposited along active margins is thus limited.