D. Gagnevin

University College Dublin

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J. Stephen Daly

University College Dublin

Guido Poli

Vita-Salute San Raffaele University

Andreas Kronz

University of Göttingen

Tod E. Waight

University of Copenhagen

Martin J. Whitehouse

Swedish Museum of Natural History

Matthew Horstwood

British Geological Survey

Adriana Giret

Universitat Politècnica de València

Julian F. Menuge

University College Dublin

D. J. Morgan

University of Leeds

Shane Tyrrell

Ollscoil na Gaillimhe – University of Galway

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Jean Monnet

University College Dublin

Irish Centre for Research in Applied Geosciences

Laboratoire Magmas et Volcans

Geological Survey of Denmark and Greenland

Scottish Universities Environmental Research Centre

Université Claude Bernard Lyon 1

Macquarie University

Trinity College Dublin

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Microchemical and Sr Isotopic Investigation of Zoned K-feldspar Megacrysts: Insights into the Petrogenesis of a Granitic System and Disequilibrium Crystal Growth

Journal of Petrology (2005)

D. Gagnevin J. Stephen Daly Guido Poli D. J. Morgan

K-feldspar megacrysts (Kfm) are used to investigate the magmatic evolution of the 7 Ma Monte Capanne (MC) monzogranite (Elba, Italy). Dissolution and regrowth of Kfm during magma mixing or mingling events produce indented resorption surfaces associated with high Ba contents. Diffusion calculations demonstrate that Kfm chemical zoning is primary. Core-to-rim variations in Ba, Rb, Sr, Li and P support magma mixing (i.e. high Ba and P and low Rb/Sr at rims), but more complex variations require other mechanisms. In particular, we show that disequilibrium growth (related to variations in diffusion rates in the melt) may have occurred as a result of thermal disturbance following influx of mafic magma in the magma chamber. Initial 87Sr/86Sr ratios (ISr) (obtained by microdrilling) decrease from core to rim. Inner core analyses define a mixing trend extending towards a high ISr–Rb/Sr melt component, whereas the outer cores and rims display a more restricted range of ISr, but a larger range of Rb/Sr. Lower ISr at the rim of one megacryst suggests mixing with high-K calc-alkaline mantle-derived volcanics of similar age on Capraia. Trace element and isotopic profiles suggest (1) early megacryst growth in magmas contaminated by crust and refreshed by high ISr silicic melts (as seen in the inner cores) and (2) later recharge with mafic magmas (as seen in the outer cores) followed by (3) crystal fractionation, with possible interaction with hydrothermal fluids (as seen in the rim). The model is compatible with the field occurrence of mafic enclaves and xenoliths.

Igneous differentiation

Petrogenesis

Magma chamber

Phenocryst

Silicic

10.1093/petrology/egi031

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Citations (95)

Zn, Fe and S isotope fractionation in a large hydrothermal system

Geochimica et Cosmochimica Acta (2012)

D. Gagnevin Adrian J. Boyce Craig D. Barrie Julian F. Menuge Robert J. Blakeman

Isotopic signature

10.1016/j.gca.2012.04.031

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Citations (124)

Insights into magma evolution in Capraia Volcano (Italy) from plagioclase chemical and isotopic zonation

Geochimica et Cosmochimica Acta (2006)

D. Gagnevin J. Stephen Daly Tod E. Waight Guido Poli Sandro Conticelli

10.1016/j.gca.2006.06.380

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Citations (0)

In-situ zircon U–Pb, oxygen and hafnium isotopic evidence for magma mixing and mantle metasomatism in the Tuscan Magmatic Province, Italy

Earth and Planetary Science Letters (2011)

D. Gagnevin J. Stephen Daly Matthew Horstwood Martin J. Whitehouse

Igneous differentiation

10.1016/j.epsl.2011.02.039

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Citations (83)

Insights into magmatic evolution and recharge history in Capraia Volcano (Italy) from chemical and isotopic zoning in plagioclase phenocrysts

Journal of Volcanology and Geothermal Research (2007)

D. Gagnevin Tod E. Waight J. Stephen Daly Guido Poli Sandro Conticelli

Phenocryst

Magma chamber

Radiogenic nuclide

Igneous differentiation

Fractional crystallization (geology)

Melt inclusions

10.1016/j.jvolgeores.2007.07.018

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Citations (25)

Erratum to D. Gagnevin, J. S. Daly, T. E. Waight, D. Morgan, and G. Poli (2005) “Pb isotopic zoning of K-feldspar megacrysts determined by Laser Ablation Multi-Collector ICP-MS: Insights into granite petrogenesis”, Geochimica et Cosmochimica Acta 69, 1899–1915

Geochimica et Cosmochimica Acta (2005)

D. Gagnevin

Laser Ablation

10.1016/j.gca.2005.05.001

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Citations (2)

Zircon as proxy of magma differentiation and mixing in the Tuscan Magmatic Province (Italy)

GeCAS (2008)

D. Gagnevin J. Stephen Daly Martin J. Whitehouse Matthew Horstwood Andreas Kronz

Igneous differentiation

Proxy (statistics)

Source

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Citations (3)

Pb isotopic zoning of K-feldspar megacrysts determined by Laser Ablation Multi-Collector ICP-MS: Insights into granite petrogenesis

Geochimica et Cosmochimica Acta (2005)

D. Gagnevin J. Stephen Daly Tod E. Waight D. J. Morgan Guido Poli

Petrogenesis

Igneous differentiation

Fractional crystallization (geology)

10.1016/j.gca.2004.10.007

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Citations (77)

Insights into granite petrogenesis from quantitative assessment of the field distribution of enclaves, xenoliths and K-feldspar megacrysts in the Monte Capanne pluton, Italy

Mineralogical Magazine (2008)

D. Gagnevin J. Stephen Daly Guido Poli

Abstract A detailed field study to determine quantitatively the distribution of K-feldspar megacrysts, mafic microgranular enclaves (MME) and metasedimentary xenoliths has been carried out in the Monte Capanne pluton (Elba, Italy) with a view to evaluating the utility of this approach to petrogenetic investigations. Mafic microgranular enclaves are inferred to result from interactions between mafic and felsic magmas, while xenoliths attest to crustal assimilation occurring in the Monte Capanne magma chamber. In particular, we emphasize, based on our field data, that both processes are intimately linked, such that xenolith dissolution during assimilation was triggered by replenishment with hot mafic magma. It is suggested that the previously defined ‘San Piero’ and ‘San Francesco’ facies do not differ substantially, and are thus amalgamated and renamed as the ‘Pomonte’ facies. Results also indicate that the abundance of K-feldspar megacrysts is positively correlated with the volumetric abundance of MME in the Sant’ Andrea facies, which we link to a recharging, mingling and textural coarsening event that occurred at a rather late stage of magma-chamber evolution prior to emplacement. This study demonstrates how petrogenetic processes can be deciphered by detailed field quantitative analyses of granite-forming components, thus complementing geochemical investigations.

Xenolith

Petrogenesis

10.1180/minmag.2008.072.4.925

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Citations (29)

Isotopic (Sr) and microchemical zoning of K-feldspar megacrysts in the monte Capanne monzogranite (Elba island, Italy): insight into magma dynamics in a young plutonic system.

EGS - AGU - EUG Joint Assembly (2003)

D. Gagnevin J. Stephen Daly Guido Poli

Petrogenesis

Source

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Citations (2)