Chapter

Dyke Swarms:Keys for Geodynamic Interpretation

pp 33-45

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An Integrated Study of Proterozoic Dykes, Dharwar Craton, Southern India

  • E. J. PiispaAffiliated withDepartment of Geological and Mining Engineering and Sciences, Michigan Technological University Email author 
  • , A. V. SmirnovAffiliated withDepartment of Geological and Mining Engineering and Sciences, Michigan Technological University
  • , L. J. PesonenAffiliated withDivision of Geophysics and Astronomy, University of Helsinki
  • , M. LingadevaruAffiliated withDepartment of Applied Geology, Kuvempu University
  • , K. S. Anantha MurthyAffiliated withDepartment of Applied Geology, Kuvempu University
  • , T. C. DevarajuAffiliated withDepartment of Studies in Geology, Karnatak University

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Abstract

The integration of paleomagnetic data with geochronological and geochemical analyses of mafic dyke swarms is a powerful tool for correlating the swarms on regional and global scales. The multidisciplinary approach may also provide important insights into various problems of Earth evolution. We present new results of our paleomagnetic and geochemical investigations of several Proterozoic dykes from the Dharwar craton (Southern India). When combined with the available geochronological data, our data support the presence of at least two different E-W trending dyke swarms (~2,370 and ~1,890 Ma) in the Dharwar craton. Our results are also consistent with the possibility that the Bastar and Dharwar cratons were amalgamated before ~2,370 Ma.

Keywords

Mafic dykes Paleomagnetism Geochemistry Geochronology Dharwar craton India