Mildly peraluminous high-silica granites in a continental rift: the Drammen and Finnemarka batholiths, Oslo Rift, Norway
Article Abstract:
The magmatic evolution of the peraluminous granites in the Finnemarka and Drammen batholiths in the Oslo Rift, Norway, was studied by petrographic analysis. Results indicate that these granites were the result of partial melting of crustal gabbros of similar composition during magmatism in the Permo-Carboniferous era. The accumulated heat produced by magma that failed to reach the surface promoted this process. Compositional analysis of the eight petrographic types found in the batholiths revealed that the different geologic intrusions were not comagmatic.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Origin of peraluminous granites and granodiorites, Iberian massif, Spain: an experimental test of granite petrogenesis
Article Abstract:
The origin of peraluminous granites and granodiorites found at the Iberian massif in Spain was determined by means of Sr-Nd isotope analyses, melting experiments of likely source materials and melting-assimilation experiments. The Sr-Nd isotope relationship confirm a pure crustal origin for the peraluminous leucogranites and a hybrid origin for the peraluminous granodiorites. Melting assimilation experiments indicated that an important crustal growth event occurred during the Late-Palaeozoic Hercynian orogeny.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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Assessing subcontinental lithospheric mantle sources for basalts: Neogene volcanism in the Pacific Northwest, USA as a test case
Article Abstract:
An analysis of the Neogene lavas in the Blue Mountain Province, Pacific Northwest, USA, shows that some of the continental basalts originate from the sublithospheric mantle. This is true only in the areas having rapid extension or after continuous thermal anomaly. The chemical variation is either due to melting or contamination of magmas by crusts from different periods. The study involves observations of isotopes and trace elements of the lava.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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