Neoarchaean Felsic Volcanic Rocks in Tracing Evolution of Arcs: An Insight from Geochemical Data of the Gadag Schist Belt, Western Dharwar Craton
Authors
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SDM College of Engineering and Technology, Dharwad - 580 002
V.S. Hedge -
Department of Geosciences and CEED, University of Oslo
Fernando Corfu
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Geodynamics & Geomaterials Research Bavarian Georesources Centre (BGC) Institute of Geography and Geology, University of Würzburg, Am Hubland
Hartwig E. Frimmel
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Geological Society of India, Bengaluru - 560 085
R.H. Sawkar
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Geologcial Survey of India, Bengaluru - 560 078
M.M. Korkoppa
DOI:
https://doi.org/10.1007/s12594-021-1693-3Keywords:
No keywords.Abstract
Quartz porphyry of rhyolitic composition though a volumetrically minor is an important component of metavolcanic successions in the Gadag schist belt in the western Dharwar craton. The quartz porphyries are calc-alkaline, enriched in light rare earth elements (Lan/Ybn ~ 10-20) and with a strong negative Eu anomaly (Eu/Eu*N = 0.45-0.58). These features, coupled with high K2O/Na2O (0.8 to 1.46), low Nb/Th (<1),and Lan/Smn ratios of 4.2 to 6.0, suggest that rhyolitic magma formed from melt generated by partial melting of basaltic crust, subsequently modified by crustal assimilation and crystal fractionation. The geological setting of the quartz porphyries and the geochemical relationships suggest magmatism at a convergent plate tectonic setting. The zircon UPb age of 2588.0 ± 2.4 Ma for the quartz porphyry, together with an age of 2732 Ma for similar volcanic rocks in the Chitradurga schist belt further south, and 2614 Ma for felsic volcanics from the Shimoga schist belt, point to an extended period with episodic arc magmatism in the western Dharwar craton of at least ~144myr.
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