Abstract
One atmosphere experimental study on fresh basaltic rocks of Paleoarchean western Iron Ore Group (IOG) basin of Singhbhum Craton, Eastern India gives insight of the crystallization behavior of the parent magma, liquid lines of descent and appearance of the different constituent phases. The natural starting material is sufficiently ferroan (FeOt: 14.28 wt%) and corresponds to ‘ferro-basalt’. Regarding the experimental run products, clinopyroxene shows Al2O3 rich character (ranging from 2.23–6.94 wt%; formed due to fluctuating silica activities in the magma) while plagioclase reveals typical Fe-Mg enrichment (that corresponds to higher KdFe-Mg between plagioclase and the parent liquid caused due to immiscible silicate melt inclusion in plagioclase where Mg enters more readily in plagioclase than Fe). The run-product glass corresponds to both high and low iron contents suggesting liquid immiscibility in the parent magma at particular temperature-domains. This study suggests that the crystallization of the western Iron Ore Group basalts represents a broad ‘Skaergaard analogue’ involving depression/shift of eutectic point in the diopside-anorthite system during crystallization.
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Acknowledgements
This work is an outcome of collaborative research project between Department of Geology, University of Calcutta and Central Petrological Laboratory, Geological Survey of India (GSI), Kolkata, India. The authors are thankful to the authority of Geological Survey of India for according necessary permission to publish this paper. Sincere thanks are due to the concerned scientists of GSI for their whole-hearted help and co-operation during XRF and EPMA studies. C. Manikyamba is thankful to the Director, NGRI for encouragement and support. Incisive comments from the anonymous reviewer to upgrade the quality of the paper are thankfully acknowledged. Authors also thank Dr. Sandeep Singh for editorial handling.
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Style of Fractional Crystallization in Basalts from the Paleoarchean Western Iron Ore Group of Singhbhum Craton, Eastern India: Implications from One Atmosphere Experimental Studies
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Mahapatra, R.R., Mukherjee, P., Paul, M. et al. Style of Fractional Crystallization in Basalts from the Paleoarchean Western Iron Ore Group of Singhbhum Craton, Eastern India: Implications from One Atmosphere Experimental Studies. J Geol Soc India 98, 627–634 (2022). https://doi.org/10.1007/s12594-022-2037-7
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DOI: https://doi.org/10.1007/s12594-022-2037-7