Istituto di Geoscienze e Georisorse     
Cortecci G., Del Moro A., Leone G., Pardini G. Correlation between strontium and oxygen isotopic compositions of rocks from Adamello Massif (Northern Italy). In: Contributions To Mineralogy and Petrology, vol. 68 (4) pp. 421 - 427. Springer, 1979.
Rock samples from the lithologic units forming the Adamello massif were analyzed for Rb and Sr concentrations and for 87Sr/86Sr and 18O/16O ratios. The most important features are as follows: (a) the strontium and oxygen isotopes show a systematic variation from south to northwest across the massif, the older units in the south being lower both in 87Sr and18O; (b) a good positive correlation was found between strontium and oxygen isotopic compositions. Two genetic models are advanced for explaining the results: (1) the mixing of two magmas with different 18O and 87Sr contents; (2) magma formation at different depths in a crust layered with respect to both oxygen and strontium isotope composition.
URL: http://link.springer.com/journal/410
Subject Italy
igneous rocks
radiometric geochronology

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