87Sr/86Sr and 18O/16O isotopic systematics and geochemistry of granitoid plutons across a steeply-dipping boundary between contrasting lithospheric blocks in western Idaho

Article Abstract:

Granitoid plutons in contrasting lithospheric blocks in western Idaho were analyzed to determine the strontium and oxygen isotopic and elemental geochemistry of the area under study. Results indicate an abrupt geochemical boundary ranging from tonalite to granite in four plutonic complexes. This is the result of the boundary between accreted terranes from oceanic arcs and the continental margin. The change in crustal characteristics, documented in the elemental composition of the intrusions, is deep indicating a vertical boundary.

Natural history, Intrusions (Geology), Idaho Batholith

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Behavior of isotopic systematics during deformation and metamorphism: a Hf, Nd and Sr isotopic study of mylonitized granite

Article Abstract:

Compositional analysis of deformed granite from a mylonite zone in Harquahala Mountains, AZ, was undertaken to determine the effects of metamorphism and deformation on the isotopic composition of rocks. Results indicate that the hafnium and neodymium isotopic systems were relatively immobile compared to the strontium isotopic system. This indicates that a analysis of the hafnium and neodymium isotopic composition of rocks will give a reliable model with which to infer age information.

Measurement, Neodymium, Hafnium, Strontium, Geological time, Geochronology

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Behavior of isotopic systematics during deformation and metamorphism: a Hf, Nd and Sr isotopic study of mylonitized granite

Article Abstract:

The errors in Rb concentrations were amended to reproduce Rb-Sr isotopic results. The changes do not affect the results that the Rb-Sr systematics of the mylonitized granites are disturbed compared to Sm-Nd and Lu-Hf systems. The new analyses considered duplicate results from Arizona and Wisconsin laboratories and calculations by total spiking.

Research, Analysis, Petrology, Correction Notice, Mylonite

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