Caledonian eclogite-facies metamorphism by Early Proterozoic protoliths from the north-east Greenland Eclogite Province

Article Abstract:

A study that establishes the origin of metamorphism in eclogite-facies in north-east Greenland as having started in the Caledonian age is given. Geochronologic, isotopic and petrologic analyses were made on three samples of mafic and ultramafic rocks. Results of the study lend credence to significant thickening of the Laurentian crust during the Caledonian period. These findings challenge current theories about the collision geometries in the Arctic caledonides.

Greenland, Proterozoic Eon

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U-Pb zircon geochronological evidence for Neopretozoic events in the Glenfinnan Group (Moine Supergroup): the formation of the Ardgour granite gneiss, north-west Scotland

Article Abstract:

The age and Precambrian history of the Moine Supergroup in the Caledonide belt of northwest Scotland are studied. Thermal ionization mass spectrometry and sensitive high resolution ion microprobe dating of U-Pb show that the age of the anatectic Ardgour granite gneiss and its enclosed segregation pegmatites is 873 +- 7 Ma, indicating the existence of a Neoproterozoic episode of high-grade metamorphism in the Glenfinnan Group Moine.

Analysis, Scotland, Rocks, Metamorphic, Metamorphic rocks, Granite, Gneiss

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Response of zircon U-Pb isotopes and whole-rock geochemistry to CO2 fluid-induced granulite facies metamorphism, Kabbaldurga, Karnataka, South India

Article Abstract:

A study was conducted to examine the impact of isotopes on CO2 granulite facies formation. The study tests a formation at Kabbaldurga, Karnataka, South India for the facies transition's predicted overprinting impact on Archaean amphibolite-facies nebulitic gneisses and the late Archaean Closepet granite. Results show that Kabbaldurga rocks were formed by the metamorphic overprint of amphibolite-facies rocks.

Isotopes, Geochemistry, Karnataka, India

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