A microstructural and argon laserprobe study of shear zone development at the western margin of the Nanga Parbat-Haramosh Massif, western Himalaya

Article Abstract:

Research into the interrelationship between fabrics and argon isotope systematics has focused on shear zone development at the western margin of the Nanga Parbat-Haramosh Massif in western Himalaya. Attention was given to some of the complexities of argon isotope behaviour within a rock sample where there has been polyphase deformation involving a number of K-bearing minerals. It was possible to identify important variations in apparent ages which are directly connected to the presence of excess argon. It cannot always be assumed with deforming metamorphic rocks that diffusion in grain boundaries is rapid.

Research, Argon, Himalaya Mountains, Isotope geology

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The role of hybridization in the genesis of Hercynian granitoids in the Gredos Massif, Spain: inferences from Sr-Nd isotopes

Article Abstract:

The granitoids with microgranular enclaves (GME) are part of a mixing trend involving Paleozoic mantle-derived magma and melts of older crustal substance. The Sr-Nd isotopic study shows that the hybridization process is complex, relating various end-members of mantle and crustal affinities and occurred nearly 295 Ma ago. Late-stage peraluminous leucogranites have somewhat the same Nd isotopic compositions to the evolved GME.

Iberian Peninsula, Strontium

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A Variscan pressure-temperature-time path for the N-E Mont Blanc massif

Article Abstract:

The Mont Blanc massif in Switzerland is composed mostly of granite rocks characterized by Mont Blanc intrusions and gneisses. These metamorphic rocks contain different sub-economic Fe skarns. Using Ar/Ar dating, metamorphic hornblendes have been found to have a minimum age of about 334 Ma. Fluid incision studies further show that the iron skarns developed at lower temperatures ranging from 400 to 500 degrees Celsius.

Analysis, Natural resources, Granite, Gneiss, Inclusions, Mont Blanc

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