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Petrology and geochemistry of greywackes from Goa-Dharwar sector, western Dharwar Craton: Implications for volcanoclastic origin

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Journal of the Geological Society of India

Abstract

Late Archaean Supracrustals of the Goa-Dharwar sector (GDS) are composed of a thick sequence of greywacke sequence with narrow intercalations of quartzite, BIF and carbonates. Mafic volcanics occupy the base of the sequence. The greywackes are predominantly tuffacious containing chlorite-sericite and hornblende. Arkosic variations containing biotite dominate the western part of the sector. Fine-grained variations occur as isolated narrow lenses within other types of greywackes. The conglomeratic greywackes are localized along the western and the eastern margins of the sector. All of the greywackes are all typically immature containing coarser clasts of mostly plagioclase (18–23%) and quartz (32–34%). Lithic fragments of felsic volcanic rocks are common. The matrix is dominated by mafic material. Biotite and amphibole are related to metamorphic recrystallization. Chlorite, sericite, epidote, carbonate and chert are products of the interplay of diagenesis and low-grade metamorphism. Fe-Ti oxide, sphene, apatite and zircon are usual accessories. But for slight enrichment in K2O, the major element chemistry of the GDS greywackes is similar to the chemistry of Late Archaean greywackes. They also compare in respect of V, Co, Hf contents, K2O/Na2O, SiO2/Al2O3, Na2O/Al2O3, Ba/Rb, Th/U, La/Th, Sm/Nd ratios, steep REE patterns with distinct LREE enrichment and HREE depletion. The GDS greywackes however are distinctly enriched in Rb, Ba, Sr, Th, U, Cu, Zr, Ce/Ce* and depleted in Cr, Ni, and Zn. The conglomeritic and biotite bearing verities contain considerable proportions of clasts derived from the basement tonalitic/granitic terrain. The common tuffacious greywackes containing hornblende and biotite-sericite however include only volcanic clasts and bear evidence of derivation from submarine weathering of predominantly felsic volcanics erupted on a large scale to form a magmatic arc in the later stages of geosynclinal deposition. Geochemical data suggest that the GDS greywackes were laid down in progressively changing basin geometry from a passive to active continental margin and island arc setting.

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Authors and Affiliations

  1. ‘Rajamangala’ Saptapur, Haliyal Road, Dharwad, 580 001, India

    T. C. Devaraju

  2. Department of Applied Geology, Kuvempu University, Jnanasahyadri, Shankaraghatta, 577 451, India

    T. L. Sudhakara & S. A. Ahmed

  3. Institute of Geosciences, University of Oulu, P.O.Box 3000, FIN-90014, Oulu, Finland

    R. J. Kaukonen & T. T. Alapieti

  4. School of Geosciences, University of Witwatersrand, Johannesburg, South Africa

    R. P. Viljoen

  5. Ashapura Minechem Ltd., ‘Sita Kunj’, # 4-119C, Kunjibettu, Udupi, 576 102, India

    S. Sivakumar

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Devaraju, T.C., Sudhakara, T.L., Kaukonen, R.J. et al. Petrology and geochemistry of greywackes from Goa-Dharwar sector, western Dharwar Craton: Implications for volcanoclastic origin. J Geol Soc India 75, 465–487 (2010). https://doi.org/10.1007/s12594-010-0050-8

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