Abstract
The discovery, at Kabbaldurga quarry, Karnataka, south India1–3, of patches of charnockite apparently in an arrested state of development has refocused attention on the mechanism of charnockite formation. In particular, the relative roles of CO2 and H2O during high grade metamorphism and charnockite development can be studied in such an area. During an influx of a CO2-rich volatile phase, H2O may be liberated as a result of the reduction in the state of hydration by the breakdown of hydrous minerals4. The P–T conditions in which this occurs are important because, with an increase in XH2O, conditions which may allow anatexis could be initiated in advance of such a CO2-rich phase. Indeed, Weaver5 has suggested that the K-rich acid charnockites found at Pallavaram, Madras6, developed due to changes in volatile composition before the onset of charnockite conditions. The exposure at Kabbaldurga quarry is interpreted here as displaying evidence that such a process has taken place.
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Friend, C. Charnockite and granite formation and influx of CO2 at Kabbaldurga. Nature 294, 550–552 (1981). https://doi.org/10.1038/294550a0
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DOI: https://doi.org/10.1038/294550a0
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