Journal ArticleDOI
Trace element evolution in the Phlegrean Fields (Central Italy): fractional crystallization and selective enrichment
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Trace element analysis of Phlegrean Fields volcanic products shows that they belong to a homogeneous series whose evolution is due mainly to fractional crystallization as discussed by the authors, and the enrichment is strongest in products resulting from protracted differentiation (trachybasalts-latites).Abstract:
Trace element analysis of Phlegrean Fields volcanic products shows that they belong to a homogeneous series whose evolution is due mainly to fractional crystallization. However quantitative modelling of crystal fractionation using measured mineral/groundmass and computed bulk distribution coefficients singles out K, Sb, Cl and F as elements which are selectively enriched in the differentiation process with respect to proven hygromagmaphile (HYG) elements. This “anomalous” enrichment involving elements that are easily transported in a magmatic fluid phase is thought to be due to percolation of such a fluid through a stored magma body. This enrichment is strongest in products resulting from protracted differentiation (trachybasalts-latites). Isotopic data from the literature are reinterpreted in terms of this model and show good agreement. Trace elements concentrations in clinopyroxenes provide evidence that complex differentiation paths were followed to produce latitic magmas. Their origin by mixing of magmas from different parentages is not indicated by the data. However, mixing of batches of the same parentage but of different degree of evolution seems likely. Because HYG elements ratios are not modified in the evolution of the magmas, they record these ratios in the partial melting zone. For example, the Th/Ta ratio in the source areas of the magmas has apparently been quite heterogeneous.read more
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The restless, resurgent Campi Flegrei nested caldera (Italy): constraints on its evolution and configuration
G. Orsi,S. de Vita,M. A. Di Vito +2 more
TL;DR: In this article, the authors collected new stratigraphic data in the Campi Flegrei caldera through surface geological mapping and study of cores drilled to various depths.
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Application of proton-microprobe data to trace-element partitioning in volcanic rocks
A. Ewart,William L. Griffin +1 more
TL;DR: In situ proton microprobe analyses are used to calculate partition coefficients (D ) for Mn, Fe, Cu, Zr, Ga, Rb, Sr, Y, Zn, Ba and Pb, and more restricted data for Ni, Ge, Nb and As, in pyroxenes, olivines, biotites, hornblendes, feldspars and Fe-Ti-oxides, from 32 volcanic rocks as mentioned in this paper.
Journal ArticleDOI
Geochemical zoning, mingling, eruptive dynamics and depositional processes; the Campanian Ignimbrite, Campi Flegrei caldera, Italy
TL;DR: The Campanian Ignimbrite (CI) is a large volume trachytic tuff erupted at 37 ka from the Campi Flegrei and composed of a fallout deposit overlain by ignimbrites.
Journal ArticleDOI
Trace element partition coefficients for clinopyroxene and phlogopite in an alkaline lamprophyre from Newfoundland by LAM-ICP-MS
Stephen F. Foley,Simon E. Jackson,Brian J. Fryer,Brian J. Fryer,John D. Greenouch,George A. Jenner +5 more
TL;DR: In this paper, a laser ablation microprobe (LAM-ICP-MS) was used to determine mineral/rock matrix partition coefficients for clinopyroxene and phlogopite from a Mesozoic alkaline lamprophyre.
Journal ArticleDOI
Chemical and Sr-isotopical evolution of the Phlegraean magmatic system before the Campanian Ignimbrite and the Neapolitan Yellow Tuff eruptions
Lucia Pappalardo,Lucia Civetta,Massimo D'Antonio,Alan L. Deino,M. A. Di Vito,G. Orsi,Antonio Carandente,S. de Vita,Roberto Isaia,Monica Piochi +9 more
TL;DR: In this article, geochronological, geochemical, and Sr-isotope data on volcanics erupted before the Campanian Ignimbrite (CI, 37 ka) and the Neapolitan Yellow Tuff (NYT, 12 ka) caldera-forming eruptions at Campi Flegrei (CF) have allowed us to investigate the behavior and temporal evolution of the Phlegraean magmatic system.
References
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Journal ArticleDOI
Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization
TL;DR: In this paper, the mass assimilation rate is an arbitrary fraction(r) of the fractional crystallization rate, where r < 1 is a combination of zone refining and fractional scaling.
Journal ArticleDOI
Quantitative models of trace element behavior in magmatic processes
Claude J. Allègre,J. F. Minster +1 more
TL;DR: In this paper, the present status of the utilization of trace elements in igneous processes, which acknowledges the deep-seated conviction of Paul Gast that the trace element approach was at least as powerful as experimental petrology to solve the major petrological problems.
Journal ArticleDOI
The effects of assimilation of country rocks by magmas on 18O/16O and 87Sr/86Sr systematics in igneous rocks
TL;DR: In this article, a variety of oxygen and strontium isotope mixing curves were calculated for this process of combined assimilation-fractional crystallization, and the positions and characteristics of the resultant curves on δ18O-87Sr/86Sr diagrams markedly diverged from simple two end-member mixing relationships.
Journal ArticleDOI
Geochemical evolution in an advancing, periodically replenished, periodically tapped, continuously fractionated magma chamber
M. J. O’Hara,R. E. Mathews +1 more
TL;DR: A summary of the development of ideas concerning geochemical evolution in periodically replenished, periodically tapped, continuously fractionated magma chambers lists 28 main conclusions or observations as mentioned in this paper, and the main body of the paper presents the derivations of the relationships which underpin these conclusions and leads on to a further 10 observations about the likely behaviour of such systems.
Journal ArticleDOI
Alkali ion exchange between vapor and feldspar phases
TL;DR: In this article, an invariant 3-phase assemblage consisting of 2 alkali feldspars and an alkali chloride solution was investigated at temperatures of 350 degrees to 700 degrees C. at a pressure of 2000 atmospheres.
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