Journal ArticleDOI
The primitive lavas of Roccamonfina volcano, Roman region, Italy: new constraints on melting processes and source mineralogy
TLDR
In this paper, a large collection of mafic samples from the Roccamonfina volcano were used to investigate the origin of the mafics in the Roman co-magmatic region.Abstract:
Within a large collection of lavas from the Roccamonfina volcano are rocks which represent the most mafic samples yet recorded from Roccamonfina and which are amongst the least differentiated lavas found in the Roman co-magmatic region as a whole. These rocks extend both high-K and low-K series to more primitive values. However, petrographic and geochemical considerations rule out a primary origin, and even these mafic samples appear to record the effects of repeated episodes of fractional crystallization and hybridization. Relatively potassic samples from the low-K series are apparently transitional between low-K and high-K series, as previously delineated. However, these intermediate-K samples are not transitional in their Sr isotopic composition, suggesting that there is no continuum between low-K and high-K magma source regions. Rather, the compositional range within the low-K series appears predominantly to reflect variation in the degree of melting of a common mantle source. Analysis of the low-K series data, using an inverse method suggests a source containing amphibole and garnet, and indicates that these phases were consumed during the melting processes responsible for the low-K series magmas. The role of amphibole is further indicated by the association of low K2O with elevated Rb concentration and, for example, higher Ce/Yb. Such variations are taken to reflect the consumption of high K/Rb amphibole during the initial phase of partial melting.read more
Citations
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Geochemistry of Mesozoic mafic rocks adjacent to the Chenzhou-Linwu Fault, South China; implications for the lithospheric boundary between the Yangtze and Cathaysia blocks
TL;DR: In this article, geochronological and geochemical data for Mesozoic basaltic lavas and related mafic dikes west (Group 1) and east (Group 2) of the Chenzhou-Linwu fault were identified.
Journal ArticleDOI
The Central-Western Mediterranean: Anomalous igneous activity in an anomalous collisional tectonic setting
TL;DR: In this paper, the specific geochemical character of several subduction-related Cenozoic igneous provinces are described with a view to identifying the processes responsible for the modifications of their sources.
Journal ArticleDOI
Tertiary-Quaternary magmatism within the Mediterranean and surrounding regions
TL;DR: In this article, a detailed discussion of the major and trace element and Sr-Nd-Pb isotope characteristics of the magmatism in the Central Mediterranean region provides important insights into the petrogenesis and the nature of the main mantle source components.
Journal ArticleDOI
Shoshonite and sub-alkaline magmas from an ultrapotassic volcano: Sr–Nd–Pb isotope data on the Roccamonfina volcanic rocks, Roman Magmatic Province, Southern Italy
Sandro Conticelli,Sara Marchionni,Davide Rosa,Guido Giordano,Elena Boari,Riccardo Avanzinelli,Riccardo Avanzinelli +6 more
TL;DR: The Roccamonfina volcano is characterised by two stages of volcanic activity that are separated by volcano-tectonic caldera collapses in the Northern Roman Province as discussed by the authors.
Journal ArticleDOI
Temporal evolution of the Roccamonfina volcanic complex (Pleistocene), Central Italy
TL;DR: The Roccamonfina volcanic complex (RVC) is an Early to Middle Pleistocene stratovolcano sharing temporal and morphological characteristics with the Somma-Vesuvius and the Alban Hills; both being associated with high volcanic hazard for the cities of Naples and Rome, respectively.
References
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Journal ArticleDOI
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TL;DR: In this paper, a number of experiments have been conducted in order to study the equilibria between olivine and basaltic liquids and to try and understand the conditions under which OIVINE will crystallize.
Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
Crustal contamination versus enriched mantle: 143 Nd/ 144 Nd and 87 Sr/ 86 Sr evidence from the Italian volcanics
Chris J. Hawkesworth,R. Vollmer +1 more
TL;DR: In this article, a wide variety of Pliocene-Recent volcanic rocks from central Italy are presented, and they are tentatively subdivided into three zones: (1) N. Tuscany where the magmas are believed to reflect crustal anatexis.
Journal ArticleDOI
The geochemistry of potassic lavas from Vulsini, central Italy and implications for mantle enrichment processes beneath the Roman region
TL;DR: In this article, major and trace element variations within the high-K series are consistent with fractional crystallisation from a parental magma similar to the most magnesian leucitites.
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Crustal contamination versus enriched mantle: 143 Nd/ 144 Nd and 87 Sr/ 86 Sr evidence from the Italian volcanics
Chris J. Hawkesworth,R. Vollmer +1 more