Isotope geochemistry and fluid inclusion study of skarns from Vesuvius

Gilg, H. Albert; Lima, Annamaria; Somma, Renato; Belkin, Harvey E.; Vivo, Benedetto De; Ayuso, Robert A.

doi:10.1007/s007100170015

Cited by 71 publications

(63 citation statements)

References 43 publications

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“…The typical occurrence of vesuvianite is related to xenoliths of skarn, a largely mineralogically zoned, coarse-grained Ca-Mg-Fe(Mn)-rich silicate rocks [42]. At Somma-Vesuvius, these rocks are very complex in mineralogical and textural aspects.…”

Section: Occurrencementioning

confidence: 99%

“…commonly with a central cavity containing euhedral crystals of vesuvianite, garnet, wollastonite, gehlenite, or anorthite. Mono-or bimineral skarns, as well as composite ejecta (consisting of two or more rock types, such as skarn-marble, skarn-hornfels, cumulate-skarn or cumulate skarn-marble are common and document the close spatial association of at least some of these rock types at depth) with sharp contacts of skarns to marbles or hornfelses are common [42][43][44]. The mineralogical composition of skarn ejecta generally includes highly variable amounts of vesuvianite, wollastonite, clinopyroxene (diopside, hedenbergite, low-iron augite, i.e., "fassaite"), anorthite, phlogopite, clinoamphibole, garnet (mainly of the grossular-andradite series), forsterite, and humite-group minerals.…”

Section: Occurrencementioning

confidence: 99%

“…Other minerals locally observed as minor to accessory phases include melilite (gehlenite), feldspathoids (leucite, nepheline, sodalite, haüyne, nosean, scapolite, meionite, davyne, balliranoite), fluorapatite, fluorite, cuspidine, zircon, perovskite, calcite, baddeleyite, spinels (spinel sensu stricto, magnetite), REE-minerals, sulfides, etc. [41,42]. The vesuvianite-bearing calc-silicate ejecta are most likely related to the Plinian eruptions of Avellino (3800 BC) and Pompeii (79 AD) [44].…”

Section: Occurrencementioning

confidence: 99%

“…The vesuvianite-bearing calc-silicate ejecta are most likely related to the Plinian eruptions of Avellino (3800 BC) and Pompeii (79 AD) [44]. The investigations of fluid inclusions as well as the isotope compositions of Pb, Nd and Sr have been carried out, among others, on vesuvianite crystals as reported in [42]. According to [42], the formation of skarns can be related to assimilation of carbonate-wall rocks by the alkaline magma at moderate depths (<5 km), and consequent exsolution of CO 2 -rich vapor and complex saline melts from the contaminated magma that reacted with the carbonate rocks to form skarns.…”

Section: Occurrencementioning

confidence: 99%

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Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

et al. 2017

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At present, the vesuvianite group of minerals consists of eight members, six of which are distinguished by the dominant cation in the Y1(A,B) five-coordinated site. We investigated two vesuvianite samples from the type locality by electron microprobe analysis, Mössbauer and infrared spectroscopy, TGA/DSC, MAS NMR, single-crystal and powder X-ray diffraction. The crystal structures of these samples (# 27844 and 51062 from the Vesuvius collection, Fersman Mineralogical Museum, Moscow) have been refined to R 1 = 0.027 and R 1 = 0.035, respectively. Both samples have the space group P4/nnc; a = 15.5720(3) and 15.5459(3), c = 11.8158(5) and 11.7988(4), respectively. In both samples low-occupied T1 and T2 sites are populated by minor B and Al, which agrees with their high-temperature origin. According to our experimental results, the general revised crystal-chemical formula of vesuvianite can be written as VII

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Section: Occurrencementioning

confidence: 99%

Section: Occurrencementioning

confidence: 99%

Section: Occurrencementioning

confidence: 99%

Section: Occurrencementioning

confidence: 99%

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Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

et al. 2017

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“…Previous workers have studied these nodules extensively, especially the skarn and cumulate nodules from the younger Mt. Somma-Vesuvius eruptions [4][5][6][7][8][9][10][11][12]. Minerals in these nodules contain several different types of inclusions, including silicate melt, hydrosaline melt, and S-rich or CO 2 -rich fluids.…”

Section: Introductionmentioning

confidence: 99%

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Klébesz¹,

Bodnar

Vivo

et al. 2012

Open Geosciences

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Nodules (coarse-grain "plutonic" rocks) were collected from the ca. 20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma-Vesuvius, Italy. The nodules are classified as monzonite-monzogabbro based on their modal composition. The nodules have porphyrogranular texture, and consist of An-rich plagioclase, K-feldspar, clinopyroxene (ferroan-diopside), mica (phlogopite-biotite) ± olivine and amphibole. Aggregates of irregular intergrowths of mostly alkali feldspar and plagioclase, along with mica, Fe-Ti-oxides and clinopyroxene, in the nodules are interpreted as crystallized melt pockets. Crystallized silicate melt inclusions (MI) are common in the nodules, especially in clinopyroxenes. Two types of MI have been identified. Type I consists of mica, Fe-Ti-oxides and/or dark green spinel, clinopyroxene, feldspar and a vapor bubble. Volatiles (CO 2 , H 2 O) could not be detected in the vapor bubbles by Raman spectroscopy. Type II inclusions are generally lighter in color and contain subhedral feldspar and/or glass and several opaque phases, most of which are confirmed to be oxide minerals by SEM analysis. Some of the opaque-appearing phases that are below the surface may be tiny vapor bubbles. The two types of MI have different chemical compositions. Type I MI are classified as phono-tephrite -tephri-phonolite -basaltic trachy-andesite, while Type II MI have basaltic composition. The petrography and MI geochemistry led us to conclude that the nodules represent samples of the crystal mush zone in the active plumbing system of Mt. Somma-Vesuvius that were entrained into the upwelling magma during the PB-Sarno eruption.

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Effect of melt composition on crustal carbonate assimilation: Implications for the transition from calcite consumption to skarnification and associated CO₂ degassing

Carter

Dasgupta

2016

Geochem Geophys Geosyst

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Skarns are residue of relatively low-temperature magma-induced decarbonation in the crust largely associated with silicic plutons. Mafic magmatic intrusions are also capable of releasing excess CO 2 due to carbonate assimilation. However, the effect of mafic to silicic melt evolution on the decarbonation processes, in addition to temperature controls on carbonate-intrusive magmatic systems, particularly at continental arcs, remains unclear. In this study, experiments performed in a piston cylinder apparatus at midcrustal depth (0.5 GPa) at supersolidus temperatures (900-12008C) document calcite interaction with andesite and dacite melts at equilibrium under closed-system conditions at calcite saturation in a 1:1 meltcalcite ratio by weight. With increasing silica content in the starting melt, at similar melt fractions and identical pressure, assimilation decreases drastically (65% andesite-calcite to 18% dacite-calcite). In conjunction, the CaO/SiO 2 ratio in melts resulting from calcite assimilation in andesitic starting material is >1, but 0.3 in those formed from dacite-calcite interaction. With increasing silica-content in the starting melt skarn mineralogy, particularly wollastonite, increases in modal abundance while diopsidic clinopyroxene decreases slightly. More CO 2 is released with andesite-calcite reaction (2.9 3 10 11 g/y) than with more skarn-like dacite-calcite interaction (8.1 3 10 10 g/y, at one volcano assuming respective calcite-freesuperliquidus conditions and a magma flux of 10 12 g/y). Our experimental results thus suggest that calcite assimilation in more mafic magmas may have first degassed a significant amount of crustal carbon before the melt evolves to more silicic compositions, producing skarn. Crustal decarbonation in long-lived magmatic systems may hence deliver significant albeit diminishing amounts of carbon to the atmosphere and contribute to long-term climate change. Key Points:Limestone assimilation increases with infiltration of hydrous andesitic melt over basaltic but decreases with dacite Skarn minerals like wollastonite increase in abundance in more silicic magma-calcite interaction Assimilation can release <0.4 Gt CO 2 during intruding magma evolution from basalt to granite

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Isotope geochemistry and fluid inclusion study of skarns from Vesuvius

Cited by 71 publications

References 43 publications

Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Effect of melt composition on crustal carbonate assimilation: Implications for the transition from calcite consumption to skarnification and associated CO₂ degassing

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Isotope geochemistry and fluid inclusion study of skarns from Vesuvius

Cited by 71 publications

References 43 publications

Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma — Vesuvius, Italy

Effect of melt composition on crustal carbonate assimilation: Implications for the transition from calcite consumption to skarnification and associated CO2 degassing

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Effect of melt composition on crustal carbonate assimilation: Implications for the transition from calcite consumption to skarnification and associated CO₂ degassing