http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29724

Chlorine partitioning between a basaltic melt and H2O-CO2 fluids at Mount Etna. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Chlorine partitioning between a basaltic melt and H2O-CO2 fluids at Mount Etna. (Articolo in rivista) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.chemgeo.2009.04.003 (literal)

Alternative label

Alletti M.; Baker D.; Scaillet B.; Aiuppa A.; Moretti R.; Ottolini L. (2009)
Chlorine partitioning between a basaltic melt and H2O-CO2 fluids at Mount Etna.
in Chemical geology; ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Alletti M.; Baker D.; Scaillet B.; Aiuppa A.; Moretti R.; Ottolini L. (literal)

Pagina inizio

37 (literal)

Pagina fine

50 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

263 (literal)

Rivista

Chemical geology (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

In: Chemical Geology, vol. 263 (1-4) pp. 37 - 50. Elsevier, 2009. (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

1-4 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Alletti M. 1); Baker D. 2); Scaillet B. 3); Aiuppa A. 1); Moretti R. 4); Ottolini L. 5). 1) CFTA, University of Palermo, Palermo, Italy; 2) Université d'Orléans, CNRS/INSU, Université François Rabelais - Tours, Institut des Sciences de la Terre d'Orléans, Orleans Cedex, France; 3) EPS, McGill University, Montreal, QC, Canada; 4) Istituto Nazionale di Geofisica e Vulcanologia, Sezione Osservatorio Vesuviano, Napoli, Italy; 5) CNR-Istituto di Geoscienze e Georisorse (IGG), Sezione di Pavia, Italy. (literal)

Titolo

Chlorine partitioning between a basaltic melt and H2O-CO2 fluids at Mount Etna. (literal)

Abstract

Partitioning experiments between a basaltic melt from Mt. Etna and a low-density hydrous fluid or vapor containing H(2)O or H(2)O-CO(2) were performed at 1200-1260 degrees C, at pressures between 1 and 200 MPa, either near the nickel-nickel oxide (NNO) buffer or at two log units above it (NNO + 2), and with different chloride concentrations. Most of the experiments were done at chloride-brine-undersaturated conditions, although at the highest Cl concentrations explored brine saturation might have been reached. The average partition coefficients (D(Cl)(fluid/melt)) over the range of Cl concentrations were derived on a weight basis by plotting the calculated concentrations of Cl in the fluid phase versus the measured ones in the melt. For H(2)O-Cl experiments in which the Cl concentration in the melt was <= 0.4 wt.%, a negative dependence between D(Cl)(f/m) and pressure is observed. D(Cl)(fluid/melt) in H(2)O + Cl-bearing experiments ranges between 11-14 at 1 and 25 MPa to 6 at 200 MPa at NNO: and between 4 at 50 MPa and 13 at 100 MPa at Delta NNO >= 2. Addition of CO(2) at NNO yields lower partition coefficients than in CO(2)-free conditions over the pressure range investigated. The negative pressure dependence observed for H(2)O-Cl experiments disappears when CO(2) is present in the system. Overall, once CO(2) is introduced in the system, Cl fugacity in the silicate melt tends to increase, thus resulting in a decrease of D(Cl)(f/m). Application to Mt. Etna shows that the composition of the volcanic plume in terms of Cl records very shallow pressures of magma equilibration with its exsolved fluid. (literal)

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