The crystallization of shoshonitic to peralkaline trachyphonolitic magmas in a H2O–Cl–F-rich environment at Ischia (Italy), with implications for the feeder system of the Campania Plain volcanoes

Melluso, Leone; Morra, Vincenzo; Guarino, Vincenza; Gennaro, Roberto de; Franciosi, Luigi; Grifa, Celestino

doi:10.1016/j.lithos.2014.10.002

Cited by 56 publications

(43 citation statements)

References 74 publications

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“…Details of the utilized standard are provided in Melluso et al. (, ). The relative analytical uncertainty was ∼1% for the major elements and 3–5% for the minor elements.…”

Section: Methodsmentioning

confidence: 99%

“…Microanalyses were performed at the Department of Earth, Environmental and Resources Science, University of Naples Federico II, using an electron microscope (JEOL JSM-5310) equipped with an Oxford Instruments Microanalysis Unit (INCAx-act EDS detector operating at 15 kV accelerating voltage, 50-100 A beam current, and 15-17 μm spot size, acquisition time 50 seconds). Details of the utilized standard are provided in Melluso et al (2010Melluso et al ( , 2014. The relative analytical uncertainty was ß1% for the major elements and 3-5% for the minor elements.…”

Section: Methodsmentioning

confidence: 99%

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Distinctive Volcanic Material for the Production of Campana A Ware: The Workshop Area of Neapolis at the Duomo Metro Station in Naples, Italy

et al. 2016

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Recent transportation infrastructure works in Naples, Italy, provided important discoveries related to the production of pottery in the Hellenistic workshop area of Piazza Nicola Amore. A minero-petrographic investigation was conducted on 35 samples belonging to the widespread Campana A ware and production indicators (clayey raw materials, unfired Graeco-Italic amphorae, kiln wastes, workshop tools). Additional analysis was conducted on black-glaze and common ware samples for comparison. The analyses reveal compositional and technological homogeneity of Campana A ware. Samples are characterized by low CaO content with evidence of both volcanic and sedimentary components, suggesting that different clay sources were properly mixed to prepare a standard recipe. Production indicators, black-glaze and common wares, have a composition well consistent with the calcareous clays from the island of Ischia. Leucite- and garnet-bearing temper from the Somma Volcano were used for the preparation of coarse-grained pastes, unfired Graeco-Italic amphorae, and clayey raw materials, thus suggesting that they represented the clay sources for amphorae production. Our results reveal new technological and socioeconomic aspects of Hellenistic pottery production in the Bay of Naples, in particular for the Campana A ware, now representing a new reference group: Neapolis

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“…Details of the utilized standard are provided in Melluso et al. (, ). The relative analytical uncertainty was ∼1% for the major elements and 3–5% for the minor elements.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Distinctive Volcanic Material for the Production of Campana A Ware: The Workshop Area of Neapolis at the Duomo Metro Station in Naples, Italy

et al. 2016

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“…Mineral chemical data (more than 600 analyses) were obtained at Centro Interdipartimentale Strumentazioni per Analisi Geomineralogiche (CISAG), University of Naples, utilizing an Oxford Instruments Microanalysis Unit equipped with an INCA X-act detector and a JEOL JSM-5310 microscope. Further analytical details can be found in Melluso et al (2010Melluso et al ( , 2014.…”

Section: Discussionmentioning

confidence: 99%

“…The relative stability of the TiZr rich phases does not directly depend upon the oxygen fugacity but, rather, by chemical parameters such as the activity of Na 2 O, CaO and K 2 O ). In such magmatic systems, the concentration of Na, Cl, F and other volatile species are generally high and increase the solubility of HFSE in highly evolved melts, with the consequent late crystallization of phases such F-disilicates and eudialyte in the interstices of lavas and intrusive rocks Melluso et al 2012Melluso et al , 2014. The Ampasindava agpaitic phonolites formed by fractional crystallization of a phonolitic magma in a Na-, Cl-, F-rich enviroment (e.g., Melluso et al 2012;Andersen et al 2010;Lustrino et al 2012).…”

Section: The Evolved Rocksmentioning

confidence: 99%

The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar

Cucciniello

Tucker²,

Jourdan

et al. 2015

Miner Petrol

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The Ampasindava alkaline province consists of a series of circular and elliptical intrusions, lava flows, dyke swarms and plugs of Cenozoic age emplaced into the Mesozoic-Cenozoic sedimentary rocks of the Antsiranana basin (NW Madagascar) and above the crystalline basement. The magmatism in the Ampasindava region is linked to a NW-SE trending extensional tectonic setting. New 40Ar/39Ar age determinations on feldspar separate of alkali granites and basaltic dykes yielded ages of 18.01 ± 0.36 Ma and 26 ± 7 Ma, respectively. Alkali basalts and basanites, nepheline syenites and phonolites, and silica saturated-to-oversaturated syenites, trachytes, granites and rhyolites are the main outcropping lithologies. These rocks have sodic affinity. The felsic rocks are dominant, and range from peraluminous to peralkaline. The mantle-normalized incompatible element patterns of the mafic lavas match those of Na-alkaline lavas in within-plate rift settings. The patterns are identical in shape and absolute concentrations to those of the Bobaomby (Cap d’Ambre) and Massif d’Ambre primitive volcanic rocks. These geochemical features are broadly compatible with variable degrees of partial melting of incompatible element-enriched mantle sources. The mineralogical and geochemical variations are consistent with fractional crystallization processes involving removal of olivine, feldspar, clinopyroxene, amphibole, Fe-Ti oxides and apatite. Removal of small amount of titanite explains the concave upward lanthanide pattern in the evolved nepheline syenites and phonolites, which are additionally rich in exotic silicates typical of agpaitic magmas (eudialyte, F-disilicates)

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“…Reports for Zr-rich accessory minerals in lava flows are scarce (e.g., de Hoog and van Bergen 2000; Carlier and Lorand 2003;Stockstill et al 2003;Moore and DeBari 2012;Melluso et al 2012Melluso et al , 2014, and it remains unclear if this is due to the small crystal size of these phases impeding easy identification, or if this reflects a rarity of lava flows carrying these accessories. Predicting the occurrence of Zr-bearing phases in mafic lavas based on whole-rock compositions also appears to be difficult (e.g., de Hoog and van Bergen 2000).…”

Section: Zr-bearing Accessory Minerals In Campi Flegrei Lava Flowsmentioning

confidence: 99%

U-Th baddeleyite geochronology and its significance to date the emplacement of silica undersaturated magmas

Schmitt

Pappalardo

2015

American Mineralogist

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Baddeleyite is a frequently found accessory mineral in silica undersaturated lavas. Because it is typically enriched in uranium, while having low initial lead, baddeleyite has long been a prime target for U-Pb geochronology of mafic rocks. The difficulties in retrieving small baddeleyite grains from volcanic samples and the lack of a detailed understanding of baddeleyite occurrence, however, have limited baddeleyite chronology largely to coarse-grained mafic intrusive rocks. Here, the development of U-Th in situ baddeleyite analysis using secondary ionization mass spectrometry (SIMS) is presented together with an assessment of baddeleyite occurrence in Quaternary silica-undersaturated lavas from Campi Flegrei (Naples, Italy). Samples studied comprise the pre-and post Campanian Ignimbrite (ca. 40 ka) lava domes of Cuma and Punta Marmolite, and Astroni and Accademia, respectively. The in situ sample preparation required initial identification of baddeleyite crystals from sawed and polished rock billets using scanning electron microscope (SEM) backscatter imaging and energy-dispersive X-ray analysis. U-Th baddeleyite isochron ages for intra-caldera Astroni and Accademia lava domes are 5.01 +2.61 -2.55 ka (MSWD = 2.0; n = 17) and 4.36 +1.13 -1.12 ka (MSWD = 2.9; n = 24), respectively. The ages for Punta Marmolite (62.4 +3.9 -3.8 ka; MSWD = 1.2; n = 11) and Cuma (45.9 +3.6 -3.5 ka; MSWD = 2.2; n = 11) predate the Campanian Ignimbrite. Rapid baddeleyite crystallization at the time of emplacement is supported by petrologic observations that >50% of the baddeleyite crystals documented in this study occur either in vesicles or in vesicle-rich regions of the host lavas whose textures developed over timescales of a few years to a few decades based on microlite crystal size distribution (CSD) analysis. Radiometric U-Th baddeleyite ages are mostly in agreement with previously determined K-Ar eruption ages, except for the Punta Marmolite lava dome whose U-Th baddeleyite age predates the K-Ar age by ca. 15 ka. Baddeleyite thus records eruptive emplacement with little evidence for significant pre-eruptive crystal residence, and has potential as an eruption chronometer for Quaternary silica-undersaturated volcanic rocks.

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The crystallization of shoshonitic to peralkaline trachyphonolitic magmas in a H2O–Cl–F-rich environment at Ischia (Italy), with implications for the feeder system of the Campania Plain volcanoes

Cited by 56 publications

References 74 publications

Distinctive Volcanic Material for the Production of Campana A Ware: The Workshop Area of Neapolis at the Duomo Metro Station in Naples, Italy

Distinctive Volcanic Material for the Production of Campana A Ware: The Workshop Area of Neapolis at the Duomo Metro Station in Naples, Italy

The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar

U-Th baddeleyite geochronology and its significance to date the emplacement of silica undersaturated magmas

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