Structural evidence supporting a remnant origin of patchy charnockites in the Chilka Lake area, India

Article Abstract:

The Chilka Lake in Orissa, in India, is surrounded by garnetiferous granite gneisses (leptynites) in a granulite-migmatite suite which contains charnockites rocks with orthopyroxene. A study of the structures of various scales revealed that three phases of deformation could be found in the region. The S1 dominates the metapelitic granulites, and the migmatite complex is made of leptynites, charnockites, and quartzofeldspathic veins.

Analysis, Gneiss

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First report of Pan-African Sm-Nd and Rb-Sr mineral isochron ages from regional charnockites of southern India

Article Abstract:

There have been many studies on huge charnockites from southern India. However, these studies failed to present the mineral isochron ages of charnockites. To remedy this lack of information, a charnockite from Kottaram at the southern tip of the Indian Peninsula is subjected to radioactive dating. Results show the Pan-African technothermal event to be regional in character and accompanied by terrain-wide rejuvenation.

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Discussion

Article Abstract:

A 1992 study by W.B. Harland concluded that Spitsbergen's Ny Friesland Orogen was an unbroken 18-kilometer-thick, late Proterozoic-Ordovician, geosynclinal succession, confirming the findings of a 1956 study. However, recent field, geochemical and isotopic information shows that this view is inconclusive and that much remains unknown about the Friesland Orogen. A reply by W.B. Harland is included.

Svalbard

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