Petrographic, geochemical and isotopic constraints on magma dynamics and mixing in the Miocene Monte Capanne monzogranite (Elba Island, Italy)

Gagnevin, D.; Daly, J. Stephen; Poli, Guido

doi:10.1016/j.lithos.2004.04.043

Cited by 58 publications

(86 citation statements)

References 75 publications

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“…the 5-Ma-old Giglio and 7-Ma-old Montecristo plutons), the MC pluton has received particular attention due to abundant and fresh exposures. We refer to Dini et al (2002Dini et al ( , 2004 and Gagnevin et al (2004Gagnevin et al ( , 2005a for details on the petrology of the MC pluton. Briefly, the pluton has a bulk monzogranitic composition, with the mineralogy chiefly consisting of plagioclase, microperthitic K-feldspar, quartz and biotite, with apatite, zircon, allanite and monazite as accessory minerals.…”

Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

“…Briefly, the pluton has a bulk monzogranitic composition, with the mineralogy chiefly consisting of plagioclase, microperthitic K-feldspar, quartz and biotite, with apatite, zircon, allanite and monazite as accessory minerals. Based on field, textural and chemical data, the intrusion is divided into the Sant' Andrea and Pomonte facies Gagnevin et al 2008a), although their Sr and Nd isotopic compositions are almost indistinguishable (initial 87 Sr/ 86 Sr *0.715 and 143 Nd/ 144 Nd *0.5122) (Gagnevin et al 2004). Similarly, mafic microgranular enclaves (MME; Poli 1992), zoned K-feldspar megacrysts (Gagnevin et al 2005a, b) and reaction micro-textures between accessory minerals ) occur widely throughout the intrusion, all of which have been interpreted as evidence for mixing between mantle and crustal magmas.…”

Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

“…The large range of chemical and isotopic composition of the lavas both at the whole-rock and mineral ) scales is indicative of open-system behaviour. Importantly, a Capraialike, mantle-derived end-member has been inferred to have been involved in mixing with peraluminous melts in the Elba igneous complex (Poli 1992;Gagnevin et al 2004). …”

Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

“…Most of these samples (Table 1) are well characterised petrographically, chemically (major and trace elements) and isotopically (Sr and Nd) (Gagnevin et al 2004). Samples DG236 and DG05-01 are petrographically similar to other rocks from the ''Sant' Andrea facies'' Gagnevin et al 2008a) in the MC pluton and dacite in Capraia Volcano, respectively, and are assumed to be geochemically similar to other rocks occurring in these areas (Bussy 1990;Gagnevin et al 2004Gagnevin et al , 2007. Fig.…”

Section: Samplesmentioning

confidence: 99%

“…This paper focuses on the Monte Capanne (MC) pluton, a geochemically well-characterised intrusion, which has been the subject of intensive whole-rock and mineral-scale studies (Poli 1992;Dini et al 2002;Gagnevin et al 2004Gagnevin et al , 2005a. Building on previous studies of textural, chemical and isotopic variations within K-feldspar megacrysts (Gagnevin et al 2005a, b), we want to test whether or not zircon is another useful tracer for magma processes and mixing in the MC pluton, as suggested in other intrusions (Wang et al 2002;Lowery Claiborne et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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This study documents the chemical and textural responses of zircon in the Elba igneous complex, with particular reference to the 7-to 7.8-Ma-old Monte Capanne pluton in relation to its coeval volcanic counterpart (Capraia), using BSE imaging and quantitative electron microprobe analyses. The Monte Capanne pluton displays multiple field and geochemical evidence for magma mixing. The samples we have investigated (including monzogranitic, mafic enclave and dyke samples) display similar zircon textures and are associated with an extremely large range of trace and minor element (Hf, Y, HREE, Th, U) compositions, which contrast with relatively simple textures and zoning patterns in zircons from a Capraia dacite. We have used a relatively simple textural classification (patchy zoning, homogenous cores, oscillatory zoning and unzoned zircon) as the basis for discussing the chemical composition and chemical variation within zircons from the Monte Capanne pluton. Based on these data and other works in Lithos 78:101-118, 2004 , it is inferred that mixing between metaluminous and peraluminous melts occurred early in the evolution of the Monte Capanne magma chamber. In particular, mixing was responsible for the development of the patchy-zoning texture in the zircon cores, which was associated with reactions between other accessory phases (including monazite, apatite, allanite), which we infer to have significantly affected the Th distribution in zircon. Zircons from the MC pluton displaying ''homogeneous cores'' have chemical affinities with zircons in the coeval Capraia volcanic system, consistent with the participation of a Capraia-like mantle end-member during mixing. Further zircon growth in the MC pluton produced the oscillatory zoning texture, which records both long-term (crystal fractionation) and transient (recharge with both silicic and mafic magmas) events in a hybrid magma chamber. It is inferred that Hf and the Th/U ratio cannot be used alone to infer magmatic processes due to their dependency on temperature, nor are they a diagnostic feature of xenocrystic grains. This study shows that zircon chemistry coupled with detailed textural analysis can provide a powerful tool to elucidate the complex evolution of a magma system.

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Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

Section: Geological Background and Petrological Inferencesmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Gagnevin

Daly

Kronz

2009

Contrib Mineral Petrol

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The Tuscany Province

Peccerillo¹

2016

Cenozoic Volcanism in the Tyrrhenian Sea Region

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Rapid accumulation and ascent precedes caldera forming eruption of low viscosity magma

Jorgenson,

Caricchi,

Chiaradia

et al. 2024

Contrib Mineral Petrol

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Mafic magma is commonly associated with effusive eruptions, however several mafic volcanoes throughout the globe have produced explosive eruptions. Here we present one such volcano – Colli Albani. Colli Albani is 20 km SE of Rome and produced seven large volume ignimbrites. Field observations, mineral chemistry, and Sr and Nd isotopes in clinopyroxene show that the high potassic, silica undersaturated and CO$$_{2}$$ 2 -rich magma typical of Colli Albani is produced by partial melting of a metasomatized mantle. Clinopyroxene based thermobarometry combined with thermal modelling, indicates rapid accumulation of magma into the shallow crust preceding the last caldera forming event (355 ka). The crystallization of high Mg# and high Cr$$_{2}$$ 2 O$$_{3}$$ 3 clinopyroxenes at low pressures and high temperatures indicates rapid magma ascent from the mantle. We suggest that a final rapid input of this deeply sourced magma destabilised the shallow and fast assembled magma reservoir and lead to the caldera forming event. Our findings have significant implications for the evaluation of the timescales of reactivation of Colli Albani and other similar long-quiescent calderas erupting low viscosity magmas, as rapid migration of magma to shallow reservoirs may result in short unrest periods prior to a large eruption.

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Petrographic, geochemical and isotopic constraints on magma dynamics and mixing in the Miocene Monte Capanne monzogranite (Elba Island, Italy)

Cited by 58 publications

References 75 publications

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

Zircon texture and chemical composition as a guide to magmatic processes and mixing in a granitic environment and coeval volcanic system

The Tuscany Province

Rapid accumulation and ascent precedes caldera forming eruption of low viscosity magma

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