Petrology is the study of rocks - igneous, metamorphic, and sedimentary - and the processes that form and transform them. Mineralogy is the study of the chemistry, crystal structure and physical ...

Cratonic roots formed over 2.5 Ga ago show unusual orthopyroxene and Si enrichment but Ti depletion. These peridotites have high volatile (H, F and Cl) contents, suggesting a key role in subducted ...

THERE is probably no department of science in which the nomenclature is in such a state of confusion as in petrology. The rocks that form the earth's crust include an innumerable variety of types ...

The Journal of Geology, Vol. 91, No. 1 (Jan., 1983), pp. 23-39 (17 pages) Key Idea: Following the spirit of P. D. Krynine, the sands of the world's largest tropical river system are studied to reveal ...

Abstract The mineralogy and chemical compositions of shale and sandstone alternations of Cretaceous age of the Monte Soro Unit, Sicily, have been determined. The clay minerals in the shales are mostly ...