The relationship between websterite and peridotite in the Balmuccia peridotite massif (NW Italy) as revealed by trace element variations in clinopyroxene
Article Abstract:
The REE pattern of clinopyroxene in peridotite ranges between highly LREE depleted to moderately enriched, while in Cr-diopside it ranges from moderately LREE depleted to enriched. MREE are always enriched relative to HREE. LREE and Sr increase in the clinopyroxene due to transition from peridotite to Cr-diopside websterite by a diffusion process. The modal cpx is elevated and the opx/cpx ratio is reduced in another type of peridotite to websterite dike transition. The study is conducted on Balmuccia massif, NW Italy.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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The Finero phlogopite-peridotite massif: an example of subduction-related metasomatism
Article Abstract:
No dramatic variation was noted in pyroxenite dykes and ambient peridotite. Insignificant variation was observed since the two were characterized by powerful enrichment in a compatible element and the same incompatibility diagrams. Pyroxenite dykes and ambient peridotite observed also exhibited high refractory major element composition. Metasediment-derived components were found to be capable of affecting the carbonatite-like geochemical features.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
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Crystal chemical variations in Ba-rich biotites from gabbroic rocks of lower crust (Ivrea Zone, NW Italy)
Article Abstract:
An analysis of crystal chemical variations in biotitesfrom gabbroic rocks is presented. The analysis tests gabbros and diorite rocks found among various stratigraphic levels of the Ivrea Zone in Italy. It is shown that their systematic cmopositional variations validate substitution models which define btoh rock types. In addition, variations between gabbros and diorites may be traced to host rock characteristics and crystallization.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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