Skip to main content
SpringerLink
Log in

Structural appraisal of the Gadag schist belt from gravity investigations

  • Published:
Journal of Earth System Science Aims and scope Submit manuscript

Abstract

Semi-detailed gravity investigations were carried out over an area of approximately 2750 sq km with maximum N-S and E-W extents of 55 and 50 km respectively in the Gadag region in the Dharwar craton with a view to obtain a clearer perception of the structural configuration of the region.

From qualitative analysis of the gravity data, several tectonic features are inferred: the high density Gadag schist belt is characterized by a gravity high and occurs in two discontinuous segments — the main N-S trending segment, and its thinner NW-SE trending extension, the two separated by a NE-SW trending deep seated fault. While the N-S trend of the Gadag schist belt is bounded on its east by the NW-SE trending Chitradurga thrust fault and on its west by another major NNWSSE trending fault, the NW-SE extension is likewise bounded by two other NW-SE major faults.

Quantitative evaluation from forward modeling/inversion of five profiles in the region, assuming a density contrast of 0.29gm/cc of the anomalous schistose body with the gneissic host rocks indicated a synclinal structure plunging to the southeast along its axis for the Gadag schist belt. The maximum width and depth from surface of the schist belt are 22 km and 5.6 km respectively.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Appa Rao M, Chakravarthy R, Ananda Reddy and B S R Murthy 1995 Geophysical studies for the identification of structures associated with gold mineralization in the Hutti-Muski schist belt, Raichur district, Karnataka, India;J. Assoc. Expl. Geophysics XVI (2) 85–94

    Google Scholar 

  • Beckinsale R D, Drury S A, Holt R W 1980 3,360-Million year old gneisses from the south Indian craton;Nature 283 469–470

    Article  Google Scholar 

  • Bhaskar Rao Y J, Naha K, Srinivasan R, Gopalan K, 1991 Geology, geochemistry and geochronology of the Archaean peninsular around Gorur, Hassan District, Karnataka, India;Proc. Indian Acad. Sci (Earth Planet. Sci) 100 399–412

    Google Scholar 

  • Chadwick B, Vasudev V N and Hegde G V 2000 The Dharwar craton, southern India, interpreted as the result of late Archaean oblique convergence;Precambrian Research 99 91–111

    Article  Google Scholar 

  • Chakabarti S, Reddy U S and Natarajan W K 1993 Sedimentary structures in the Archaean sediments of Gadag schist belt, Karnataka;J. Geol. Soc. India 41 523–528

    Google Scholar 

  • GMPAC 1999 Gravity and magnetic processing and analysis package;Spectra Software Services, Hyderabad

  • Gokarn S G, Rao C K, Gupta G and Selvaraj C 2001 Magnetotelluric studies over the granite greenstone belts of the Dharwar region;Proc. of DST Workshop on ’GeoInvestigations along Jadcharla-Goa Subtransect’ 27th–28th June 2001 at Dept. of Geophysics, Osmania University, Hyderabad.

    Google Scholar 

  • Harikumar P, Mita Rajaram and Balakrishnan T S 2000 Aeromagnetic study of peninsular India;Proc. Indian Acad. Sci. (Earth Planet. Sci.) 109 (3) 381–391

    Google Scholar 

  • Kaila K L, Roy Chowdhury K, Reddy P R, Krishna V G, Hari Narain, Subbotin S I, Sollogub V B, Chekunov AV, Kharetchko G E, Lazarenko M A and Ilchenko T V 1979 Crustal structure along the Kavali-Udipi profile in the Indian peninsular shield from deep seismic sounding;J. Geol. Soc. India 20 307–333

    Google Scholar 

  • Keshavamani M, Vemkateswarlu M, Rajanikumar M, Murali N C, Jawahar G, Khare A C, Raghuramaiah K, Chayanulu AYSR, Raju V L and Mohan Rao T 1999 Significance of regional gravity surveys in mapping granite greenstone terrains over parts of eastern Dharwar craton;Proc. Golden Jubilee Seminar on Exploration Geophysics, G S I special publication No. 49.

  • Mita Rajaram, Harikumar P and Balakrishnan T S 2001 Comparison of the aero and marine magnetic data over peninsular India;J. Geophysics XXII (1) 11–15

    Google Scholar 

  • Naha K, Srinivasan R and Naqvi S M 1986 Structural unity in the early Precambrian Dharwar tectonic province, Peninsular India;Q. J. Geol. Mineralog. Metallurg. Soc. India 58 219–243

    Google Scholar 

  • Naqvi S M and Rogers J J W 1987Precambrian geology of India, Oxford Monographs on Geology and Geophysics (Oxford Univ. Press)6 57–81

  • Narayanaswamy S and Ahmed M 1963 Geology of Gadag Gold field, Dharwar District, Mysore State;Geol. Soc. India. Memoir 1 107–116

    Google Scholar 

  • Nutman A P, Chadwick B, Krishna Rao B, Vasudev V N 1996 SHRIMP U/Pb zircon ages of acid volcanic rocks in the Chitradurga and Sandur Groups, and granites adjacent to the Sandur Schist Belt, Karnataka;J. Geol. Soc. India 47 153–164

    Google Scholar 

  • Radhakrishna B P and Vaidyanadhan R 1997Geology of Karnataka; Published by the Geological Society of India, Bangalore.

    Google Scholar 

  • Rajamani V 1990 Petrogenesis of metabasites from the schist belts of the Dharwar craton: Implications to Archaean mafic magmatism;J. Geol. Soc. India 36 565–587

    Google Scholar 

  • Ramadass G, Ramaprasada Rao I B, Himabindu D and Srinivasulu N 2002 Pseudo-surface velocities (densities) and pseudo-depth densities (velocities) along selected profiles in the Dharwar craton, India;Current Science 82 (2) 197–202

    Google Scholar 

  • Srinivasulu N, Shivakeshavulu A, Ramadass G and Ramaprasada Rao I B 2000 Gravity base stations established along the Jadcharla-Raichur-Panaji subtransect;J. Geol. Soc. India 56 (2) 219–222

    Google Scholar 

  • Subramanyam C and Verma R K 1982 Gravity interpretation of the Dharwar greenstone-gneiss-granite terrain in the southern Indian shield and its geological implications;Tectonophysics 84 225–245

    Article  Google Scholar 

  • Swami Nath J, Ramakrishnan M, Viswanatha M N, 1976 Dharwar stratigraphic model and Karnataka craton evolution;Geol. Surv. India Records 107 149–175

    Google Scholar 

  • Taylor P N, Chadwick B, Moorbath S, Ramakrishnan M, Viswanatha M N 1984 Petrography, chemistry and isotopic ages of peninsular gneiss, Dharwar acid volcanic rocks and the Chitradurga granite with special reference to the late Archaean evolution of the Karnataka craton;Precambrian Res. 23 349–375

    Article  Google Scholar 

  • Ugarkar A G and Devaraju T C 1994 Ore mineralogy of western auriferous zone of Gadag, greenstone belt, Karnataka;J. Geol. Soc. India 43 549–555

    Google Scholar 

  • Ugarkar A G, Devaraju T C and Holkoaho T A A 1994 Invisible gold in arsenopyrites of the Gadag gold field in Karnataka;Current Science 67 (8) 605–606

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Center of Exploration Geophysics, Osmania University, 500 007, Hyderabad, India

    G. Ramadass, D. Himabindu & N. Srinivasulu

Authors
  1. G. Ramadass
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. D. Himabindu
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. N. Srinivasulu
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ramadass, G., Himabindu, D. & Srinivasulu, N. Structural appraisal of the Gadag schist belt from gravity investigations. J Earth Syst Sci 112, 577–586 (2003). https://doi.org/10.1007/BF02709781

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02709781

Keywords

Search

Navigation