Syncontractional extension and exhumation of deep crustal rocks in the east Greenland Caledonides

Article Abstract:

Research is presented concerning the use of 40Ar/39Ar dating and U-Pb dating of monazite to investigate the main anatectic midcrustal ultraductile top of the orogenic thickening occurring in the shear zones of the east Greenland Caledonides.

Greenland, Plate tectonics, Mountains, Folds (Geology)

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Crustal thickening leading to exhumation of the Himalayan metamorphic core of central Nepal: Insight from U-Pb geochronology and 40Ar/39 Ar thermochronology

Article Abstract:

Research investigating the process of thickening of the geological crust of the Himalayan region of Nepal and its consequences is presented. Particular attention is given to the consequence of exhumation of the Central Nepal metamorphic core and to geochronological data.

Nepal, Rocks, Metamorphic, Metamorphic rocks, Geological time, Geochronology

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An 40Ar/39Ar thermochronology of the Ofoten-Troms region: implications for the terrane amalgamation and extensional collapse of the northern Scandinavian Caledonides

Article Abstract:

40Ar/39Ar cooling age data reveals cooling patterns in metamorphic hornblende and muscovite terranes in northern Norway. Observations indicate that the cooling ages vary from 425 to 394 Ma in the hornblende range. Comparative studies also show that metamorphism is large in Scandinavia with some nappes containing remnants of pre-Scandinavian metamorphism. The disturbances in the cooling patterns cause the emergence of the thrust.

Scandinavia, Isotope geology

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