Petrography and Geochemistry of Archaean Greywackes from Northern Part of the Dharwar-Shimoga Greenstone Belt, Western Dharwar Craton: Implications for Nature of Provenance

Authors

  • A. G. Ugarkar
     Department of Geology, Karnatak University, Dharwad - 580 003
  • B. Chandan Kumar
     Department of Geology, Karnatak University, Dharwad - 580 003
  • M. A. Malapur
     Department of Geology, Karnatak University, Dharwad - 580 003
  • T. B. Manuvachari
     Department of Geology, Karnatak University, Dharwad - 580 003
  • A. C. Kerr
     School of Earth and Ocean Sciences, Cardiff University, Cardiff

DOI:

https://doi.org/10.1007/s12594-017-0643-6

Abstract

Greywackes (Dharwar greywackes) are the most abundant rock types in the northern part of the Dharwar-Shimoga greenstone belt of the western Dharwar craton. They are distinctly immature rocks with poorly-sorted angular to sub-angular grains, comprising largely quartz, plagioclase feldspar and lithic fragments of volcanics (mafic+felsic), chert and quartzite, with subordinate biotite, K-feldspar and muscovite. They are characterized by almost uniform silica (59.78-67.96 wt%; av. 62.58), alkali (4.62-7.35 wt%; av. 5.41) contents, SiO2/Al2O3 (3.71-5.25) ratios, and compositionally are comparable to the andesite and dacite. As compared to Ranibennur greywackes, located about 100 km south of Dharwad in the Dharwar-Shimoga greenstone belt, the Dharwar greywackes have higher K2O, CaO, Zr, Y, SREE, Th/Sc, Zr/Cr, La/Sc and lower Sr, Cr, Ni, Sc, Cr/Th values. The chondrite normalized patterns of Dharwar greywackes are characterized by moderately fractionated REE patterns with moderate to high LREE enrichment, with almost flat HREE patterns and small negative Eu anomalies, suggesting felsic dominated source rocks in the provenance. The frame work grains comprising felsic and mafic volcanics, feldspars and quartz suggest a mixed source in the provenance. The moderate CIA values ranging between 57 and 73, indicate derivation of detritus from fresh basement rocks and from nearby volcanic sources.The mixing calculations suggest that the average REE pattern is closely matching with a provenance having 40% dacite, 30% granite, 20% basalt and 10% tonalite. These greywackes were deposited in a subduction related forearc basin than a continental margin basin. Their La/Sc ratios are high (av. 4.07) compared to the Ranibennur greywackes (1.79), suggesting that the greywackes of the northern part of the basin received detritus from a more evolved continental crust than the greywackes of the central part of the Dharwar-Shimoga basin.

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Issue

Volume 89, Issue 5, May 2017 Pages (489-616)

Section

Research Articles

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Published

2017-05-01

How to Cite

Ugarkar, A. G., Chandan Kumar, B., Malapur, M. A., Manuvachari, T. B., & Kerr, A. C. (2017). Petrography and Geochemistry of Archaean Greywackes from Northern Part of the Dharwar-Shimoga Greenstone Belt, Western Dharwar Craton: Implications for Nature of Provenance. Journal of Geological Society of India, 89(5), 547–553. https://doi.org/10.1007/s12594-017-0643-6
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