What is it about?
This paper reports occurrence of an unusual quartz-xenocrysts laden mafic dykes. These dykes have been affected by the carbonatitic fluids which commonly attack quartz xenocrysts, resulting in the formation of a complex growth pattern between quartz and carbonates.Original basaltic texture (sub-ophitic) and mineralogy (plagioclase, magnetite, ilmenite) is preserved, though pyroxenes are converted to chlorite; hematite, ilmenite, calcite and altered glassy material occur profusely in the groundmass. Basaltic dykes of such description have not so far been reported from the Deccan Igneous Province. The present study is based on the study of fluid inclusions within quartz xenocrysts.
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Why is it important?
Occurrence of such dykes is very unusual and seldom reported anywhere in the world.
Perspectives
Chhota Udaipur is a complex, having influenced by variety of magmatism including tholeiitic and alkaline-carbonatitic. Apart from these, there is a profound influence of hydrothermal activity in this reion that resulted in the formation of fluorite mineralization at Amba Dongar, REE mineralization at Phenai Mata, occurrence of large number of unique 'calcareo-siliceous' dykes and typical hydrothermal (deuteritic) alteration of the country rocks. The quartz-xenocrysts laden dykes are related to similar processes, indicating presence of pervasive hydrothermal event in the region.
Dr Kirtikumar R. Randive
RTM Nagpur University
Read the Original
This page is a summary of: Fluid Inclusion Study of Quartz Xenocrysts in Mafic Dykes from Kawant Area, Chhota Udaipur District, Gujarat, India, Open Geosciences, September 2015, De Gruyter,
DOI: 10.1515/geo-2015-0019.
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