Relation of present-day magmatism to global tectonic processes
Petrogenetic studies of igneous rocks involve characterization of the source regions of the magmas, the conditions of partial melting (Ch. 3), and the extent of subsequent modification of primary mantle derived magmas during transport and storage in high-level magma chambers (Ch. 4). Such studies must be based on sound field observations, involving careful mapping and sampling of the range of rock types exposed at a particular locality, and on a comprehensive knowledge of the petrography, major, minor and trace element and radiogenic and stable isotope geochemistry of the samples. Additionally, if the igneous activity is not recent, its age must be constrained, ideally by isotopic dating techniques.
KeywordsVolcanic Rock Partial Melting Igneous Rock Tectonic Setting Active Continental Margin
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