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Mineralogy and petrology of associated Mg-rich ultrapotassic, shoshonitic, and calc-alkaline rocks; the Middle Latin Valley monogenetic volcanos, Roman magmatic province, southern Italy

Mineralogy and petrology of associated Mg-rich ultrapotassic, shoshonitic, and calc-alkaline rocks; the Middle Latin Valley monogenetic volcanos, Roman magmatic province, southern Italy

The Canadian Mineralogist 45(6): 1443-1469

In the Middle Latin Valley, in the Roman Magmatic Province, southern Italy, volcanism developed during the Late Pleistocene, with eruption of high-Mg magmas characterized by a low content of phenocrysts. Small volumes of magma, transported to the surface rapidly, favored by an extensional post-collision regime, led to small monogenetic centers aligned along two main tectonic trends. The absence of a large magmatic reservoir allowed the occurrence of a fairly large amount of mafic, strongly primitive volcanic rocks with a fairly large enrichment in potassium. They range in composition from plagioclase-free ultrapotassic melilite-bearing (kamafugites) to ultrapotassic leucitites and plagioclase leucitites, to trachybasalts (shoshonites), and calc-alkaline basaltic rocks (subalkaline). The composition of minerals from the four different groups of rock is reported. The Fe-Mg distribution between olivine crystals and whole rocks indicates equilibrium crystallization. The clinopyroxene shows the typical trend of alkaline potassic and ultrapotassic rocks, ranging in composition from diopside to hedenbergite. Melilite-bearing ultrapotassic rocks are found beside feldspar-bearing ultrapotassic and potassic primitive rocks. Magnesiochromite is the main spinel; it has been found enclosed in olivine cores. Olivine-spinel pairs indicate that the magmas from which they crystallized were in equilibrium with a strongly depleted mantle source. An origin from a common mantle source, in terms of a peridotitic component, is inferred for the different varieties of ultrapotassic to subalkaline primitive rocks. This source was characterized by different degrees of metasomatic enrichment arranged in a network of veins, possibly within the lithospheric upper mantle.

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Accession: 019445622

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DOI: 10.3749/canmin.45.6.1443

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