Abstract
DURING the course of field mapping a part of the khondalitic region near Salur (lat. 18° 36′ N., long. 83° 11′ E.) in the Vishakapatnam hill tracts, an interesting contact has been observed between a lens-like band of quartz-biotite-granulite (a member of the khondalites) and a porphyritic granite considered as intrusive1 into the members of the khondalites in this region. The lens measures about 50 ft. in length, and 10 ft. in width, and appears at first sight as a caught-up xenolith amid the porphyritic granites. Careful examination at the contact shows a profound transfusion of quartzo-feldspathic material from the porphyritic granite into the lens along the whole of its length up to a distance of 2 ft. A typical specimen was collected from the contact, and though unfortunately broken into two pieces in the field, it has in no way affected the features exhibited before the mishap.
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VENKAYYA, E. Acid Front in Granitization. Nature 168, 79–80 (1951). https://doi.org/10.1038/168079b0
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DOI: https://doi.org/10.1038/168079b0
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