Advertisement

Journal of the Geological Society of India

, Volume 82, Issue 4, pp 430–434 | Cite as

Sediment thickness map of the Indian region 79°E–86°E, 2°S–8°S based on satellite gravity interpretation

  • Dhammika A. TantrigodaEmail author
  • M. M. P. M. Fernando
Research Article
  • 89 Downloads

Abstract

Satellite free air gravity anomalies over the Indian ocean region 79°E–86°E, 2°S–8°S were obtained from the website http://topex.ucsd.edu and a contour map was compiled. Five profiles of the anomaly have been interpreted in terms of two-dimensional structures in the ocean. Thickness of sediments lying on the oceanic crust determined from the interpretation of gravity profiles were used to compile an isopach map of the region 79°E–86°E, 2°S–8°S. This map in combination with one of the isopach maps compiled by previous workers, provides information regarding the thickness of sediments up to 6° S. According to this map sediment thickness varies from ∼600 m over the middle part of the region to ∼800 m further south, indicating that thinning of sediments in the middle part of the region is only localized. Information provided by this gravity study may be useful in planning detailed seismological studies to delimit the outer edge of the continental margin of Sri Lanka, defined according to the United Nations Convention of the Law of the Sea (UNCLOS).

Keywords

Gravity anomaly Sediment thickness Indian ocean Sri Lanka 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Al-Chalabi, M. (1970) The application of non-linear-optimization technique in Geophysics, Ph.D. thesis (unpublished), University of Durham.Google Scholar
  2. Cochran, J.R. and Stow, D.A.V. (1988) Intraplate deformation and Bengal fan sedimentation: Background and Objectives, Proc. ODP, Init. Repts., 116: College Station, TX (Ocean Drilling Program), pp.3–11.Google Scholar
  3. Cordell, L. and Henderson, R.G. (1968) Iterative three — dimensional solution of gravity anomaly data using a digital computer. Geophysics, v.33(4), pp.596–601.CrossRefGoogle Scholar
  4. Curray, J. R., Emmel, F.J. and Moore, D.G. (2003) The Bengal Fan: morphology, stratigraphy, history and processes. Marine and Petroleum Geol., v.19, pp.1911–1223.Google Scholar
  5. Curray, J.R., Emmel, F.J., Moore, D.G. and Raitt, R.W. (1982) Structure, tectonics and geological history of the north-eastern Indian Ocean. In: A.E.M. Nairn and F.G. Stehli (Eds.), The Ocean Basins and Margins (Vol. 6), The Indian ocean: New York (Plenum Press), pp.399–450.CrossRefGoogle Scholar
  6. Curray, J. R. and Moore, D.G. (1971) Growth of the Bengal deepsea fan and denudation of the Himalayas. Geol. Soc. Amer. Bull., no.82, pp.563–572.Google Scholar
  7. Dobrin, M.B. (1976) Introduction to geophysical prospecting, McGraw Hill, New York.Google Scholar
  8. Levchenko, O.V., Milanovskiy, V.YE and Popov, A.A. (1993) A sediment thickness map and the tectonics of the distal Bengal Fan, Oceanology, v.33(2), pp.232–238.Google Scholar
  9. Talwani, M. Worzel, J.L. and Landisman, M. (1959) Rapid gravity computations for two-dimensional bodies with applications to the Medocino submarine fracture zone. Jour. Geophys. Res., v.64, pp.49–59.CrossRefGoogle Scholar
  10. United Nations (1983) United Nations Convention on the Law of the Sea, New York.Google Scholar
  11. United Nations Division for the Ocean Affairs and Law of the Sea (1993) The Law of the Sea: Definition of the Continental Shelf, New York.Google Scholar
  12. United Nations Commission on the Limits of the Continental Shelf, (1999) Scientific and Technical Guidelines of the Commission on the Limits of the Continental Shelf, New York.Google Scholar
  13. Weissel, J.K., Anderson, R.N. and Geller, C.A. (1980) Deformation of the Indo-Australian plate. Nature, v.287, pp.284–291.CrossRefGoogle Scholar

Copyright information

© Geological Society of India 2013

Authors and Affiliations

  • Dhammika A. Tantrigoda
    • 1
    Email author
  • M. M. P. M. Fernando
    • 1
  1. 1.Department of PhysicsUniversity of Sri JayewardenepuraNugegodaSri Lanka

Personalised recommendations