Maria T. Cristi Sansone

University of Basilicata

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Giovanna Rizzo

University of Basilicata

Giacomo Prosser

University of Basilicata

Paola Tartarotti

University of Milan

Giovanni Mongelli

University of Basilicata

Salvatore Laurita

University of Basilicata

Rosa Sinisi

National Research Council - Institute of Methodologies for Environmental Analysis

Michele Paternoster

Istituto Nazionale di Geofisica e Vulcanologia

A. Merlini

University of Milan

Maria Carmela Dichicco

University of Basilicata

Francesco Perri

University of Calabria

Cooperative Institutions

University of Basilicata

University of Milan

University of Sassari

Sapienza University of Rome

National Research Council - Institute of Methodologies for Environmental Analysis

National Research Council

University of Calabria

Istituto Nazionale di Geofisica e Vulcanologia

University of Bari Aldo Moro

University of Padua

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Rodingites dikes: Metasomatism and metamorphism in the Frido Unit (Southern Apennines)

Geochimica et Cosmochimica Acta Supplement (2009)

Maria T. Cristi Sansone Giovanna Rizzo

Dike

Metasomatism

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P-T estimates from amphibole and plagioclase pairs in metadolerite dykes of the Frido unit (southern Apennines-Italy) during the ocean-floor metamorphism

Giovanna Rizzo Filomena Canora Maria Carmela Dichicco Salvatore Laurita Maria T. Cristi Sansone

Abstract The metadolerite dykes from the Frido ophiolitic sequence reflect strain partitioning with textures evolving from magmatic intersertal/intergranular, blast-ophitic and incomplete metamorphic recrystallization. Amphibole and plagioclase are the main minerals in these rocks. Amphibole composition reflects both bulk compositional and P–T changes. Different Ti, IV Al values between the brown and green amphiboles clearly indicate genetic conditions of amphiboles developed in ocean-floor hydrothermal metamorphic conditions. The electron microprobe analysis showed that the assemblage developed during ocean-floor hydrothermal type metamorphism (M1) consists of two main amphibole varieties: a brown one, and green; instead during orogenic metamorphism (M2) developed a blue amphibole. The magmatic plagioclase is anorthite (PL1) and the metamorphic plagioclase are oligoclase (PL2), albite (PL3). The estimated P–T conditions are in favour of their metamorphism under ocean-floor hydrothermal type. The variety of amphibole compositions and the plagioclase found in the metadolerite dykes offers useful constraints to reconstruction of the correlated environmental conditions providing new insights on the oceanic metamorphic evolution of this orogenic sector of southern Apennines.

Amphibole

10.3304/jmes.2019.003

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The carbonatites of Mt. Vulture as a (re)source of rare earth elements.

Rosa Sinisi Giovanni Mongelli Michele Paternoster Giovanna Rizzo Maria T. Cristi Sansone

Carbonatite

Vulture

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Mineralogy and petrology of the metasedimentary rocks from the Frido Unit (southern Apennines, Italy)

Periodico di mineralogia (2016)

Giovanna Rizzo Maria T. Cristi Sansone Francesco Perri Salvatore Laurita

This work concerns the development of a multidisciplinary research on metasedimentary rocks from the Frido Unit (southern Apennines) in the central Mediterranean area, based on petrographic study, mineralogical analysis and distribution of the major and trace elements. It aims at evaluating the paleoweathering conditions and provenance composition of the source area(s) of both shales and calcschists from the Frido Unit. Shales and calcschists underwent similar HP/LT overprint, by the occurrence of aragonite, as also shown by mineralogical analysis. The mineralogical composition of the studied rocks closely related to the geochemical variations, as shown by the negative correlation of CaO with other elements, due to the dilution effects by the carbonates, and the positive correlation of Al with most of the major and trace elements mainly related to the mica-like clay minerals. Elemental ratios, such as the Chemical Index of Alteration (CIA) and the Index of Compositional Variability (ICV), indicate low to moderate degree of chemical weathering a relatively immature source area(s) and, thus, first-cycle deposits related to tectonically active settings. Furthermore, the distribution of some major and trace elements suggest a provenance for the studied samples from source(s) composed of both felsic and mafic rocks.

Felsic

Parent rock

Trace element

Arenite

10.2451/2016pm630

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Citations (14)

From ocean to subduction: the polyphase metamorphic evolution of the Frido Unit metadolerite dikes (Southern Apennine, Italy)

Journal of the Virtual Explorer (2012)

Maria T. Cristi Sansone Paola Tartarotti Giacomo Prosser Giovanna Rizzo

Dike

Polyphase system

10.3809/jvirtex.2011.00289

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Citations (10)

Rodingites from Frido Unit: evidences for metasomatic alteration.

Maria T. Cristi Sansone Giovanna Rizzo

Metasomatism

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Oceanic evolution of Spl-peridotites of the Frido Unit ophiolites (Southern Apennine-Italy)

EGU General Assembly Conference Abstracts (2010)

Maria T. Cristi Sansone Giacomo Prosser Giovanna Rizzo Paola Tartarotti

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Citations (1)

Mafic rocks from ophiolites of the Liguride Units (Southern Apennines): petrographical and geochemical characterization.

Maria T. Cristi Sansone Giovanni Mongelli Giacomo Prosser Giovanna Rizzo

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Spinel-peridotites of the Frido Unit ophiolites (Southern Apennine-Italy): evidence for oceanic evolution

Periodico di mineralogia (2012)

Maria T. Cristi Sansone Giacomo Prosser Giovanna Rizzo Paola Tartarotti

The ophiolitic rocks of the Frido Unit include serpentinites derived from a lherzolitic to cpx-rich harzburgitic mantle, as suggested by microstructural and petrographical features. The serpentinites are englobed in tectonic slices where they are associated with mafic dykes and medium to high-grade metamorphic rocks such as amphibolites, gneiss, granofels as well as gabbros and basalts with pillow structures. The matrix of tectonic slices is mainly composed of calchschists and phyllites. The serpentinites of the Frido Unit show pseudomorphic and vein textures. Primary mantle minerals are represented by olivine, orthopyroxene, clinopyroxene and spinel and are identifiable either for the occurrence of mineral relics or pseudomorphs maintaining the mineral shape. Pseudomorphic minerals are serpentine, magnetite, chlorite, and tremolite. Olivine is replaced by serpentine forming a mesh texture; orthopyroxene is mostly altered to bastite; in some cases it shows exsolution lamellae of clinopyroxene and kink bands; fresh orthopyroxene is preserved as exsolution inside clinopyroxene porphyroclasts. Clinopyroxene is armoured by tremolite rim. Spinel shows a holly-leaf habit and is often armoured by a corona of Cr-chlorite. The core of the analyzed spinel has a Cr-Al spinel composition corresponding to chromite (Al2O3=29-31 wt %; Cr2O3= 28-37 wt%), whereas the rim has a Fe-Cr spinel composition corresponding to ferrit-chromite (Al2O3= 1-2% wt; Cr2O3=28-30 wt %). The Cr-Al spinel/ferritchromite ratio may be various in different spinel porphyroclasts. Magnetite replaces spinel or occurs within the mesh textured serpentine. The metamorphic assemblages in the Frido Unit serpentinites allow to infer qualitatively the physical conditions operating during serpentinization. The metamorphic mineral assemblages are typical of the greenschist-amphibolite transition and greenschist facies conditions, as suggested by the occurrence of tremolite replacing clinopyroxene and of Cr-chlorite and ferrit-chromite after Al-rich chromite. These minerals were produced by interactions between hydrothermal fluids and mantle peridotites. Serpentinites are cut by veins filled with mineralogical assemblages typical of the prehnite-pumpellyite facies likely related to later orogenic Apennine evolution. HP/LT metamorphic conditions (blueschist facies) have been documented in mafic dykes enclosed in serpentinites, but similar conditions are not recorded in serpentinites. This suggests that P-T conditions during the orogenic event were not able to produce a HP/LT mineral assemblage in serpentinites.

Chromite

Peridotite

Tremolite

10.2451/2012pm0003

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Citations (17)

Orogenic metamorphism recorded in amphibolites from Liguride accretionary wedge (Southern Apennine-Italy)

Rendiconti online della Società Geologica Italiana (2012)

Maria T. Cristi Sansone Giacomo Prosser Giovanna Rizzo

Accretionary wedge

Wedge (geometry)

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