Magmatic sulfide immiscibility at an active magmatic-hydrothermal system: The case of La Fossa (Vulcano, Italy)

Fulignati, Paolo; Gioncada, Anna; Costa, Simone; Genova, Danilo Di; Traglia, Federico Di; Pistolesi, Marco

doi:10.1016/j.jvolgeores.2018.06.009

Cited by 15 publications

(44 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…%, we inferred average crystallization temperature of 1025 ± 13 • C and 1008 ± 12 • C for the latitic and trachytic magmas, respectively. These values are in general agreement with previous estimates based on both thermobarometry and melt inclusion analyses [28][29][30][31]. For the H 2 O estimates, we used literature data from Nicotra et al [49] after testing that the average temperatures of 1025 and 1008 • C effectively minimize the difference (∆An < 0.1 mol.%) between An in plagioclase predicted by the equilibrium model of Namur et al [36] and the natural compositions of phenocrysts.…”

Section: Application Of the Plagioclase-liquid Hygrometersupporting

confidence: 80%

“…The hygrometer has been tested with both experimental and thermodynamically derived melt compositions, providing the best predictions for H 2 O concentrations at temperatures ranging from 850 to 1050 • C. The hygrometer has been also employed to trachyandesitic (latitic) and trachytic products erupted at the La Fossa cone of Vulcano Island. The obtained H 2 O estimates are consistent with the crystallization conditions inferred for the shallow plumbing system of the La Fossa volcano, by means of gas geochemistry [26,27], thermobarometry [28,29] and H 2 O measurements from melt inclusion studies [30,31].…”

Section: Introductionsupporting

confidence: 84%

“…Supplementary Materials: The following are available online at http://www.mdpi.com/2075-163X/9/6/375/s1, Table S1: Major element composition of glasses and plagioclases of calibration and test experimental datasets (see text for details), Table S2: Major element composition of natural clinopyroxenes (data from [28,29]) and clinopyroxene-liquid thermometric calculations (according to [22]); Table S3: Major element composition of natural plagioclases (data from [49]) and application of the new plagioclase-liquid hygrometer.…”

Section: Discussionmentioning

confidence: 99%

“…%. The clinopyroxene-liquid thermometer was thus applied to clinopyroxene phenocryst, glass and bulk rock analyses from the literature [28,29,49], after a careful selection of mineral-liquid pairs that satisfy the criteria of chemical equilibrium. Indeed, to minimize the error of temperature estimates, only compositional data yielding ∆DiHd values of less than 0.1 were selected.…”

Section: Application Of the Plagioclase-liquid Hygrometermentioning

confidence: 99%

See 3 more Smart Citations

A New Plagioclase-Liquid Hygrometer Specific to Trachytic Systems

Masotta

Mollo

2019

Minerals

View full text Add to dashboard Cite

We present a new empirical plagioclase-liquid hygrometer for estimating the amount of H2O dissolved in trachytic magmas. The hygrometer is based on the exchange reaction of anorthite between plagioclase and liquid, and is calibrated using crystallization experiments where the concentration of H2O in quenched glasses has been accurately determined based on Fourier Transform Infrared Spectroscopy (FTIR) analysis. The multiple linear regression of plagioclase-liquid cation fractions and components from experimental data obtained at 150–202 MPa, 850–1020 °C, 1.17–7.57 wt. % H2O and ΔNNO + 2.5 buffer, yields to a highly accurate model with uncertainty of only ±0.29 wt. % H2O. The model reliability has been demonstrated using an independent test data set consisting of crystallization experiments from the literature and thermodynamically derived compositions. The fairly good convergence between our model calibration and the test data set excludes systematic H2O overestimates or underestimates caused by miscalibration and data overfitting. The plagioclase-liquid hygrometer from this study has been applied to trachyandesitic (latitic) and trachytic products erupted over the last 1000 years at the La Fossa cone of Vulcano Island (Aeolian Islands, Southern Italy). Results from calculations indicate that the concentration of H2O in the latitic and trachytic melts is comprised between ~2.5 and ~3.5 wt. %. These values are in good agreement with data from melt inclusions and, overall, testify to low-pressure, open-system differentiation of trachytic magmas under strong degassing conditions.

show abstract

Section: Application Of the Plagioclase-liquid Hygrometersupporting

confidence: 80%

Section: Introductionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Application Of the Plagioclase-liquid Hygrometermentioning

confidence: 99%

See 2 more Smart Citations

A New Plagioclase-Liquid Hygrometer Specific to Trachytic Systems

Masotta

Mollo

2019

Minerals

View full text Add to dashboard Cite

show abstract

“…Recent studies, however, highlight the growing interest of research towards magmatic sulphides in porphyry ore-associated magma (e.g. Halter et al, 2005, Brennecka, 2006, Zhang and Audétat, 2017 and in barren volcanic provinces (e.g., Nadeau et al, 2010, Park et al, 2015, Fulignati et al, 2018, Zelenski et al, 2017 https://doi.org/10.5194/se-2019-106 Preprint. Discussion started: 26 July 2019 c Author(s) 2019.…”

mentioning

confidence: 99%

Magmatic sulphides in high-K calc-alkaline to shoshonitic and alkaline rocks

Georgatou

Chiaradia

2019

Preprint

View full text Add to dashboard Cite

Abstract. We investigate in both mineralised and barren systems the occurrence and chemistry of magmatic sulphides and their chalcophile metal cargo behaviour during evolution of compositionally different magmas in diverse geodynamic settings. The investigated areas are: (a) the Miocene Konya magmatic province (hosting the Doganbey Cu-Mo and Inlice Au-epithermal deposits) (Post-Subduction) and (b) the Miocene Usak basin (Elmadag, Itecektepe and Beydagi volcanoes, the latter associated with the Kisladag Au porphyry) in Western Turkey (Post-Subduction). For comparison we also investigate (c) the barren Plio-Quaternary Kula volcanic field, west of Usak (Intraplate) and finally we discuss and compare all the above areas with the already studied (d) Quaternary Ecuadorian volcanic arc (host to the Miocene Llurimagua Cu-Mo and Cascabel Cu-Au porphyry deposits) (Subduction). The volcanism of the studied areas displays a wide range of SiO2 spanning from basalts to andesites/dacites and from high K-calc-alkaline to shoshonitic series. Multiphase magmatic sulphides occur in different amounts in all investigated areas and based on textural and compositional differences, they can be classified in different types, which crystallised at different times (early versus late saturation). A decrease in the sulphide Ni/Cu (proxy for mss-monosulphide solid solution/iss-intermediate solid solution) ratio is noted with magmatic evolution. Starting with an early stage, saturating Ni-richer/Cu-poorer sulphides hosted by early crystallising minerals e.g. olivine/pyroxene, leading up to a later stage, producing Cu-richer sulphides hosted by magnetite. The most common sulphide type resulting from an early saturating stage is composed of a Cu-poor/Ni-rich (pyrrhotite/mss) and one/two Cu-rich (cubanite, chalcopyrite/iss) phases making up 84 and 16 area % of the sulphide, respectively. Our results suggest that independently of the magma composition, geodynamic setting and whether or not the system has generated an ore deposit on the surface, sulphide saturation occurred in variable degrees in all studied areas and magmatic systems and is characterised by a similar initial metal content of the magmas. However not all studied areas present all sulphide types and the sulphide composition is dependent on the nature of the host mineral. In particular sulphides, resulting from the late stage, consisting of Cu-rich phases (chalcopyrite ,bornite, digenite/iss) are hosted exclusively by magnetite and are found only in magmatic provinces associated with porphyry Cu (Konya and Ecuador) and porphyry Au (Beydagi) deposits.

show abstract

Magma evolution at La Fossa volcano (Vulcano Island, Italy) in the last 1000 years: evidence from eruptive products and temperature gradient experiments

Costa

Masotta

Gioncada

et al. 2020

Contrib Mineral Petrol

Self Cite

View full text Add to dashboard Cite

The intense explosive and effusive volcanic activity of the last 1000 years at La Fossa volcano (Vulcano Island, Italy) was characterized by the eruption of magmas ranging in composition from latites to trachytes and rhyolites, as well as K-rich trachytes. Evidence of syn-eruptive mixing among these magmas is frequently observed in the form of magmatic enclaves and bands in lava flows and pyroclastic products. The petrological and volcanological diversity of the erupted materials suggests that complex differentiation processes occurred in the shallow part of the plumbing system. With the aim to reconstruct the magmatic feeding system and to identify the differentiation processes behind such a petrologic complexity, we analysed lavas and pyroclastic products representative of the recent eruptive sequences at La Fossa and combined the petrochemical features with thermo-barometric calculations, geochemical modelling and temperature gradient experiments. Thermo-barometric calculations indicate that the K-rich trachytic magma crystallized at lower pressure (160 ± 54 MPa) compared to the latitic (307 ± 47 MPa) and trachytic (208 ± 30 MPa) magmas. Differentiation modelling suggests that both trachytic and rhyolitic compositions can be obtained through differentiation of a common latitic magma, essentially by varying the plagioclase/ sanidine ratio. Temperature gradient experiments, performed at the conditions inferred for the shallow plumbing system of La Fossa volcano (150 MPa and 1050-900 °C), indicate different paths of melt differentiation that overall produce an increase of the SiO 2 /K 2 O ratio with the increasing H 2 O in the system (from 0 to 4 wt.%). This is consistent with the origin of K-rich trachytes at lower pressure and lower H 2 O content. In turn, the formation of crystal-poor rhyolites is explained by the segregation of the interstitial melt formed in a latitic-trachytic crystal mush, favoured by the second boiling of the melt and consequent exsolution of a fluid phase.

show abstract

Magmatic sulfide immiscibility at an active magmatic-hydrothermal system: The case of La Fossa (Vulcano, Italy)

Cited by 15 publications

References 72 publications

A New Plagioclase-Liquid Hygrometer Specific to Trachytic Systems

A New Plagioclase-Liquid Hygrometer Specific to Trachytic Systems

Magmatic sulphides in high-K calc-alkaline to shoshonitic and alkaline rocks

Magma evolution at La Fossa volcano (Vulcano Island, Italy) in the last 1000 years: evidence from eruptive products and temperature gradient experiments

Contact Info

Product

Resources

About