Petrology and geochemistry of ultrapotassic rocks from the Montefiascone Volcanic Complex (Central Italy): magmatic evolution and petrogenesis

Battistini, G. Di; Montanini, Alessandra; Vernia, L.; Bargossi, Giuseppe Maria; Castorina, Francesca

doi:10.1016/s0024-4937(98)00013-9

Cited by 43 publications

(20 citation statements)

References 64 publications

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“…Accessory minerals like amphiboles, titanite and Fe-oxides were identified in some samples, in accordance with the local mineralogical composition described in literature (Orlando et al 1994). Grossular, clinopyroxene, quartz and spessartite association found in sample VT 60C is consistent with the composition of accessory minerals found in carbonate xenoliths (Di Battistini et al 1998). …”

Section: Mineralogysupporting

confidence: 85%

Analysis of fibrous zeolites in the volcanic deposits of the Viterbo Province, Italy

et al. 2010

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Since Etrurian age, the Viterbo Province (Central Italy) is famous for its ancient towns carved out of local ignimbrite deposits which geologically represent the sedimentation of pumice-rich, volcano-related pyroclastic flows. Almost the entire study area is geologically characterized by a thick succession of ignimbrites, tephra fallouts and lava flow deposits locally subjected to zeolitization. Among zeolites, fibrous erionite represents a well-known health hazard and so this work aims at locating and quantifying the presence of fibrous zeolites in volcanic deposits of the Viterbo area, suggesting at the same time a standard operational procedure useful in other areas showing the same possible hazard. 41 samples collected in the Viterbo area were analyzed by X-ray powder diffraction, optical and electron microscopy. Fibrous zeolites were detected in five samples and quantified in amounts ranging from 0.35 to 1.66% vol. They generally occur in tetragonal or orthorhombic prismatic habit and showed chemical composition mainly consistent with K-phillipsite. Fibrous zeolites occurred with aspect ratios (mean = 6.3), comparable or lower than those of erionite fibers reported in previous studies and mean diameters [3 lm.

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Section: Mineralogysupporting

confidence: 85%

Analysis of fibrous zeolites in the volcanic deposits of the Viterbo Province, Italy

et al. 2010

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“…The amount of limestone rocks required to decrease the 87 Sr/ 86 Sr ratio from 0.710 (pre-Albano) to 0.709 (Albano), indeed, is not compatible with the measured δ 18 O values (Table 5) and with thermodynamic calculations (Bohrson and Spera 2001). iii) The primitive ultrapotassic magmas from the Roman Province, characterized by high 87 Sr/ 86 Sr and LREE/HREE ratios, are generally interpreted as having originated from an enriched mantle source (Peccerillo 1985;Conticelli and Peccerillo 1992;Di Battistini et al 1998;Conticelli et al 2002;Dallai et al 2004;Perini et al 2004). The high LREE/HREE ratio of the Albano clinopyroxenes (Fig.…”

Section: Primitive Magma and Liquid Line Of Descent Of Albanomentioning

confidence: 85%

Eruptive history and petrologic evolution of the Albano multiple maar (Alban Hills, Central Italy)

et al. 2006

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A comprehensive volcanological study of the Albano multiple maar (Alban Hills, Italy) using (i) Ar-40/Ar-39 geochronology of the most complete stratigraphic section and other proximal and distal outcrops and (ii) petrographic observations, phase analyses of major and trace elements, and Sr and O isotopic analyses of the pyroclastic deposits shows that volcanic activity at Albano was strongly discontinuous, with a first eruptive cycle at 69 +/- 1 ka producing at least two eruptions, and a second cycle with two peaks at 39 +/- 1 and 36 +/- 1 ka producing at least four eruptions. Contrary to previous studies, we did not find evidence of magmatic or hydromagmatic eruptions younger than 36 +/- 1 ka. The activity of Albano was fed by a new batch of primary magma compositionally different from that of the older activity of the Alban Hills; moreover, the REE and Sr-87/Sr-86 data indicate that the Albano magma originated from an enriched metasomatized mantle. According to the modeled liquid line of descent, this magma differentiated under the influence of magma/limestone wall rock interaction. Our detailed eruptive and petrologic reconstruction of the Albano Maar evolution substantiates the dormant state of the Alban Hills Volcanic District

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“…Three models are commonly invoked to explain the genesis of alkaline igneous rocks: (1) crustal contamination of mantle-derived melt (e.g., Zhao et al, 1995;Wickham et al, 1996;Panter et al, 1997;Aydin et al, 2008;Yang et al, 2008); (2) fractional crystallization of mantle-derived alkali magmas (e.g., Panter et al, 1997;Weis et al, 1998;Battistini et al, 1998;Yang et al, 2005;Holbig and Grove, 2008); and (3) the partial melting of an enriched lithospheric mantle (e.g., Turner et al, 1996;Miller et al, 1999;Williams et al, 2004;Rios et al, 2007;Peng et al, 2008;Zhao et al, 2009aZhao et al, , 2009bHuang et al, 2010 (Fig. 10), and extreme enrichment in LILEs (e.g., Rb, Ba, and Sr) with negative Ta, Nb, and Ti anomalies (Fig.…”

Section: Genesis Of Cenozoic Mg-rich Potassic Rocks In Tibetmentioning

confidence: 99%

Cenozoic Mg-rich potassic rocks in the Tibetan Plateau: Geochemical variations, heterogeneity of subcontinental lithospheric mantle and tectonic implications

Chen

Wang

et al. 2012

Journal of Asian Earth Sciences

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Petrology and geochemistry of ultrapotassic rocks from the Montefiascone Volcanic Complex (Central Italy): magmatic evolution and petrogenesis

Cited by 43 publications

References 64 publications

Analysis of fibrous zeolites in the volcanic deposits of the Viterbo Province, Italy

Analysis of fibrous zeolites in the volcanic deposits of the Viterbo Province, Italy

Eruptive history and petrologic evolution of the Albano multiple maar (Alban Hills, Central Italy)

Cenozoic Mg-rich potassic rocks in the Tibetan Plateau: Geochemical variations, heterogeneity of subcontinental lithospheric mantle and tectonic implications

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