Structural setting and magmatic evolution of Montefiascone volcanic complex, vulsini district, central Italy

Coltorti, Massimo; Battistini, G. Di; Nappi, Giovanni; Renzulli, Alberto; Zeda, O

doi:10.1016/0377-0273(91)90078-e

Cited by 13 publications

(12 citation statements)

References 38 publications

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“…We present a systematic study of melt inclusions in olivine phenocrysts from a leucitebasanite scoria sample from Montefiascone (Vulsini area). These olivines are the most primitive among those reported in HKS and KS rocks (Ghiara and Lirer 1977;Civetta et al 1981;Peccerillo et al 1984;Giannetti and Ellam 1994) and particularly in Vulsini lavas Varekamp 1979;Varekamp and Kalamarides 1989;Coltorti et al 1991;Conticelli and Peccerillo 1992).…”

Section: Introductionmentioning

confidence: 80%

“…The southern and south-eastern sectors of the district are mostly covered by the products of the Montefiascone Volcanic Complex. Several vents can be recognized in the area, related to some regional tectonic iineaments (NNW-SSE, WNW-ESE and EW; Coltorti et al 1991) and to a polyphase calderic depression located in the SE corner of the Bolsena lake shoreline. A stratigraphy of the products related to the activity of Montefiascone has been proposed by different authors (Varekamp 1979;Marini and Nappi 1986;Cioni 1993).…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…A stratigraphy of the products related to the activity of Montefiascone has been proposed by different authors (Varekamp 1979;Marini and Nappi 1986;Cioni 1993). Coltorti et al (1991) suggested that the Montefiascone activity was coeval with that of the Latera Complex, ranging from 278 and 145 ks, with some controversies on the exact temporal range spanned by the Montefiascone products (Cioni 1993).…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…Effusive and strombolian activities resulting in leucititic lava :flows and scoria cones lined up on a WNW-ESE direction (Marini and Nappi 1986;Coltorti et al 1991). 2.…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…The most primitive rocks of the RCP, and in particular, of the Vulsini area are considered by many authors as representative of near-primary melts Varekamp 1979;Rogers et al 1985;Varekamp and Kalamarides 1989;Coltorti et al 1991;Conticelli and Peccerillo 1992), mainly based on such parameters as Mg #, Ni and Cr values, traditionally thought to be the reliable criteria of the primitiveness (e.g., Frey et al 1978). However, this is not always a sufficient argument for proving the primary nature of the melt, especially taking into account the fact that highly potassic melts probably cannot be derived from the mantle of a typical peridotite composition (Foley 1992a).…”

Section: Introductionmentioning

confidence: 99%

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Potassic primary melts of Vulsini (Roman Province): evidence from mineralogy and melt inclusions

Kamenetsky

M�trich²,

Cioni

1995

Contributions to Mineralogy and Petrology

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The origin and the relationships between the high potassic (HKS) and potassic (KS) suites of the Roman Comagmatic Province and the nature of their primary magmas have been intensively debated over the past 35 years. We have addressed these problems by a study of mineralogy (olivine Fo92-87, Cr-spinel and diopside) and melt inclusions in olivine phenocrysts from a scoria sample of Montefiascone (Vulsini area). This rock is considered as one of the most primitive (MgO = 13.5 wt%, NiO = 340 ppm; Cr = 1275 ppm) in the northern part of the Roman Comagmatic Province. The compositions of both the olivine and their melt inclusions are controlled by two main processes. In the case of the olivine Fo < 90.5, fractional crystallization (olivine + diopside + minor spinel) was the principal mechanism of the magma evolution. The olivine (Fo92 90.5) and the Cr-spinel (Cr# = 100. Cr/(Cr + A1)--63 73) represent a near-primary liquidus assemblage and indicate the mantle origin of their parental magmas. The compositions of melt inclusions in these olivine phenocrysts correspond to those of poorly fractionated H20-rich ( ~ 1 wt%) primary melts (MgO = 8.4-9.7 wt%, FeO t~ 6 7.5 wt%). They evidence a wide compositional range (in wt%: SiO2 = 46.5 50, K20 = 5.3-2.8, P205 = 0.4-0.2, S=0.26 0.12; C1=0.05 0.03, and CaO/A1203--0.8-1.15), with negative correlations between SiO2 and K20, A1203 and CaO, as well as positive correlations between K20, and P2Os, S, C1, with nearly constant

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Section: Introductionmentioning

confidence: 80%

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%

“…Effusive and strombolian activities resulting in leucititic lava :flows and scoria cones lined up on a WNW-ESE direction (Marini and Nappi 1986;Coltorti et al 1991). 2.…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 99%