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Extrusive Phase of Carbonatite-Alkalic Activity in Amba Dongar Complex, Chhota Udaipur, Gujarat
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It is noteworthy that Amba Dongar carbonatite complex has both intrusive and extrusive phase carbonatites. The stratified tuff with components of both carbonatite and nephelinite have been recently traced in western part of Amba Dongar complex. In this preliminary report we present trace and rare earth elements data and C and O isotopes of these tuffs. The C and O isotopes of the least altered tuff falls within the mantle box while the remaining samples plot in the narrow field of 16-20% in oxygen. These values are explained using simple model of water-Rock interaction.
Keywords
Carbonatites, Extrusive Phase, Amba Dongar, Gujarat.
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