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Volume 11
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Article

Lamprophyre as the Source of Zircon in the Veneto Region, Italy

by
Daria Zaccaria
1,
Noemi Vicentini
1,
Maria Grazia Perna
1,*,
Gianluigi Rosatelli
1,
Victor V. Sharygin
2,
Emma Humphreys-Williams
3,
Will Brownscombe
3 and
Francesco Stoppa
1
1
DiSPUTer, University “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy
2
VS Sobolev Institute of Geology and Mineralogy, Siberian Branch of the RAS, 630090 Novosibirsk, Russia
3
The Natural History Museum, London SW7 5BD, UK
*
Author to whom correspondence should be addressed.
Minerals 2021, 11(10), 1081; https://doi.org/10.3390/min11101081
Submission received: 12 July 2021 / Revised: 15 September 2021 / Accepted: 28 September 2021 / Published: 30 September 2021
(This article belongs to the Special Issue Zircon Petrochronology: Applications to Magmatic and Metamorphic Processes and Crustal Evolution)
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Abstract

Discrete zircons, up to 9 mm in length, occur in alluvial deposits from the Veneto area. They are likely derived from the disaggregation of lamprophyric rocks belonging to a regional, pervasive dyke-swarm. Zircon and REE phases occur in both alkaline lamprophyres and connate calcite-bearing felsic lithics and their debris in lamprophyre breccia. We present 36 new complete U–Pb and trace element analyses of zircons and associated inclusions. We used a statistical approach on a larger dataset using new and literature data to evaluate the confidence figure to give an estimation of age of zircons. Inclusions suggest a genetic link with an S–CO2–ZrO–BaO–SrO–CaO-rich fluid/melt possibly associated with carbonate-rich alkaline parental magma and a metasomatised mantle source. This paper confirms the importance of calcite–syenite and lamprophyre genetic link and zircon magmatic origin, in contrast with hydrothermal and metamorphic zircons. U–Pb dating by LA-ICP-MS provides time constrains (40.5–48.4 Ma, Lutetian), consistent with the age of the alkaline magmatic event. Trace element data indicate a link to anorogenic magmatism associated with mantle upwelling. Complex zoning is highlighted by cathodoluminescence images. The Veneto zircons are helpful for regional geological information and may have commercial potential as a critical resource for green technologies.
Keywords: zircon; lamprophyres; U–Pb dating; zircon geochemistry; Veneto region; Italy zircon; lamprophyres; U–Pb dating; zircon geochemistry; Veneto region; Italy

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MDPI and ACS Style

Zaccaria, D.; Vicentini, N.; Perna, M.G.; Rosatelli, G.; Sharygin, V.V.; Humphreys-Williams, E.; Brownscombe, W.; Stoppa, F. Lamprophyre as the Source of Zircon in the Veneto Region, Italy. Minerals 2021, 11, 1081. https://doi.org/10.3390/min11101081

AMA Style

Zaccaria D, Vicentini N, Perna MG, Rosatelli G, Sharygin VV, Humphreys-Williams E, Brownscombe W, Stoppa F. Lamprophyre as the Source of Zircon in the Veneto Region, Italy. Minerals. 2021; 11(10):1081. https://doi.org/10.3390/min11101081

Chicago/Turabian Style

Zaccaria, Daria, Noemi Vicentini, Maria Grazia Perna, Gianluigi Rosatelli, Victor V. Sharygin, Emma Humphreys-Williams, Will Brownscombe, and Francesco Stoppa. 2021. "Lamprophyre as the Source of Zircon in the Veneto Region, Italy" Minerals 11, no. 10: 1081. https://doi.org/10.3390/min11101081

APA Style

Zaccaria, D., Vicentini, N., Perna, M. G., Rosatelli, G., Sharygin, V. V., Humphreys-Williams, E., Brownscombe, W., & Stoppa, F. (2021). Lamprophyre as the Source of Zircon in the Veneto Region, Italy. Minerals, 11(10), 1081. https://doi.org/10.3390/min11101081

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