Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-03T07:47:26.499Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  05 July 2018

D. Gagnevin ,
J. S. Daly  and
G. Poli
D. Gagnevin*
Affiliation:
UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland
J. S. Daly
Affiliation:
UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland
G. Poli
Affiliation:
Department of Earth Sciences, Piazza Università, 06100 Perugia, Italy
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

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.

Keywords

K-feldspar megacrystenclavegranitepetrogenesisItaly
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 4 , August 2008 , pp. 925 - 940
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Blundy, J.D. and Sparks, R.S. (1992) Petrogenesis of mafic inclusions in granitoids of the Adamello massif, Italy. Journal of Petrology, 33, 1039–1104.CrossRefGoogle Scholar
Boccaletti, M. and Papini, P. (1989) Ricerche meso e microstruturali sui corpi ignei neogenici della Toscana. 2: Pintruzione del M. Capanne (Isola d'Elba). Bolletino della Societa Geologica Italiana, 108, 699–710.Google Scholar
Bouillin, J.P., Bouchez, J.L., Lespinasse, P. and Pecher, A. (1993) Granite emplacement in an extensional setting: an AMS study of the magmatic structures of Monte Capanne (Elba, Italy). Earth and Planetary Science Letters, 118, 263–279.CrossRefGoogle Scholar
Bussy, F. (1990) Petrogenese des enclaves microgrenues associees aux granitoides calco-alcalins: exemples des massifs varisques du Mont-Blanc (Alpes occidentales) et Miocene du Monte Capanne (He d'Elbe, Italie). Memoire de Geologie (No. 7), Lausanne, Switzerland 309 pp.Google Scholar
Chappell, B.W., White, A.J. and Wyborn, D. (1987) The importance of residual source material (restite) in granite petrogenesis. Journal of Petrology, 28, 1111–1138.CrossRefGoogle Scholar
Cox, R.A., Dempster, T.J., Bell, B.R. and Rogers, G. (1996) Crystallization of the Shap Granite: evidence from zoned K-feldspar megacrysts. Journal of the Geological Society, London 153, 625–635.CrossRefGoogle Scholar
Daly, J.S. and Poli, G. (1999) Petrogenetic insights from mieroehemieal investigations of magmatic K-feldspars in the 7 Ma Elba monzogranite. Irish Journal of Earth Science, 17, 128.Google Scholar
Daly, J.S., Gagnevin, D. and Whitehouse, MJ. (2007) Zircon growth and resorption in an incrementally filled granite pluton: insights from in situ U-Pb, trace element and Hf isotopie analyses. Geochimica et Cosmochimica Ada, 71 (15, Supplement 1), A302.Google Scholar
Didier, J. (1973) Granites and their Enclaves: the Bearing of Enclaves on the Origin of Granites. Developments in Petrology, 3, Elsevier, Amsterdam. 393 pp.Google Scholar
Didier, J. and Barbarin, B. (1991) Enclaves and Granite Petrology. Elsevier, Amsterdam. Developments in Petrology, 13, Elsevier, Amsterdam, 625 pp.Google Scholar
Dim, A., Innocenti, F., Rocchi, S., Tonarini, S. and Westerman, D. S. (2002) The magmatic evolution of the late Miocene laccolith-pluton-dyke granitic complex of Elba Island, Italy. Geological Magazine, 139, 257–279.Google Scholar
Dini, A., Rocchi, S. and Westerman, D.S. (2004) Reaction microtextures of REE-Y-Th-U accessory minerals in the Monte Capanne pluton (Elba Island, Italy): a possible indicator of hybridization processes. Lithos, 78, 101–118.CrossRefGoogle Scholar
Dorais, M.J., Lira, R., Chen, Y. and Tingey, D. (1997) Origin of biotite-apatite-rich enclaves, Achala batholith, Argentina. Contributions to Mineralogy and Petrology, 130, 31–46.CrossRefGoogle Scholar
Elburg, M.A. (1996) Evidence of isotopie equilibration between microgranitoid enclaves and host granodior-ite, Warburton Granodiorite, Lachlan Fold Belt, Australia. Lithos, 38, 1–22.CrossRefGoogle Scholar
Fenn, P.M. (1977) The nucleation and growth of alkali feldspars from hydrous melts. The Canadian Mineralogist, 15, 135–161.Google Scholar
Ferrara, G. and Tonarini, S. (1985). Radiometric geochronology in Tuscany: results and problems. Rendiconti Delia Societa Italiana di Mineralogia e Petrologia, 40, 111–124.Google Scholar
Franzini, M., Leoni, L. and Orlandi, P. (1974) Mineralogical and geochemical study of K-feldspar megacrysts from the Elba (Italy) granodiorite. Atti della Societa Toscana di Scienze Naturali, Mem., A81. 356–378.Google Scholar
Gagnevin, D. (2005) Mineral- and whole-rock investigation of granite petrogenesis in a young plutonic system: the Monte Capanne pluton. PhD thesis, University College, Dublin.Google Scholar
Gagnevin, D. and Daly, J.S. (2000) Mineral-scale SEM investigation of granite petrogenesis. 24th Annual Symposium of the Microscopical Society of Ireland, Dublin, Ireland, Abstracts.Google Scholar
Gagnevin, D., Daly, J.S. and Poli, G. (2004) Petrographic, geochemical and isotopie constraints on magma dynamics and mixing in the Miocene Monte Capanne monzogranite (Elba Island, Italy). Lithos, 78, 157–195.CrossRefGoogle Scholar
Gagnevin, D., Daly, J.S., Poli, G. and Morgan, D. (2005a) Mieroehemieal and Sr isotopie investigation of zoned K-feldspar megacrysts: insights into the petrogenesis of a granitic system and disequilibrium processes during crystal growth. Journal of Petrology, 46, 1689–1724.Google Scholar
Gagnevin, D., Daly, J.S., Waight, T., Morgan, D. and Poli, G. (20056) Pb isotopie zoning of K-feldspar megacrysts determined by laser ablation multiple-collector ICP-MS: insights into granite petrogenesis. Geochimica et Cosmochimica Ada, 69, 1899–1915.CrossRefGoogle Scholar
Gagnevin, D., Waight, T.E., Daly, J.S., Poli, G. and Conticelli, S. (2007) Insights into magmatic evolution and recharge history in Capraia Volcano (Italy) from chemical and isotopie zoning in plagioclase phenocrysts. Journal of Volcanology and Geothermal Research, 168, 28–54.CrossRefGoogle Scholar
Giraud, A., Dupuy, C. and Dostal, J. (1986) Behaviour of trace elements during magmatic processes in the crust: application to acidic volcanic rocks of Tuscany (Italy). Chemical Geology, 57, 269–288.CrossRefGoogle Scholar
Hibbard, M.J. (1965) Origin of some alkali feldspar phenocrysts and their bearing on petrogenesis. American Journal of Science, 263, 245–261.CrossRefGoogle Scholar
Higgins, M.D. (1998) Origin of anorthosite by textural coarsening: quantitative measurements of a natural sequence of textural development. Journal of Petrology, 39, 1307–1323.CrossRefGoogle Scholar
Higgins, M.D. (1999) Origin of megaerysts in granitoids by textural coarsening: a crystal size distribution (CSD) study of microcline in the Cathedral Peak Granodiorite, Sierra Nevada, California. Pp. 207–219 in: Understanding Granites: Integrating New and Classical Techniques (Castro, A., Fernandez, C. and Vigneresse, J.L., editors). Special Publication 168, Geological Society, London.Google Scholar
Higgins, M.D. and Roberge, J. (2003) Crystal size distribution of plagioclase and amphibole from Soufriere Hills Volcano, Montserrat: evidence for dynamic crystallization-textural coarsening cycles. Journal of Petrology, 44, 1401–1411.CrossRefGoogle Scholar
Higgins, M.D. and Roberge, J. (2007) Three magmatic components in the 1973 eruption of Eldfell volcano, Iceland: Evidence from plagioclase crystal size distribution (CSD) and geochemistry. Journal of Volcanology and Geothermal Research, 161, 247–260.CrossRefGoogle Scholar
Innocenti, F., Serri, G., Ferrara, G., Manetti, P. and Tonarini, S. (1992) Genesis and classification of the rocks of the Tuscan Magmatic Province: thirty years after Marinelli's model. Ada Vulcanologica, 2, 247–265.Google Scholar
Janouek, V., Bowes, D.R., Braithwaite, C. and Rogers, G. (2000) Micro structural and mineralogical evidence for limited involvement of magma mixing in the petrogenesis of a Hercynian high-K calc-alkaline intrusion: the Kozarovice granodiorite, Central Bohemian Pluton, Czech Republic. Transactions of the Royal Society, Edinburgh: Earth Sciences, 91, 15–26.CrossRefGoogle Scholar
Juteau, M., Michard, A.J. and Albarede, F. (1984) Isotopic heterogeneities in the granitic intrusion of Monte Capanne (Elba Island, Italy) and dating concepts. Journal of Petrology, 25, 532–545.CrossRefGoogle Scholar
Karsli, O., Aydinb, F. and Sadiklar, M.B. (2004) The morphology and chemistry of K-feldspar megaerysts from Ikizdere Pluton: evidence for acid and basic magma interactions in granitoid rocks, NE—Turkey. Chemie der Erde — Geochemistry, 64, 155 — 170.CrossRefGoogle Scholar
Moore, J.G. and Sisson, T.W. (2008) Igneous pheno-crystic origin of K-feldspar megaerysts in granitic rocks from the Sierra Nevada batholith. Geosphere, 4, 387–400.CrossRefGoogle Scholar
Paterson, S., Vernon, R. and Zak, J. (2005) Mechanical Instabilities and Physical Accumulation of K-feldspar Megaerysts in Granitic Magma, Tuolumne Batholith, California, USA. Journal of Virtual Explorer 18, paper 1.CrossRefGoogle Scholar
Peccerillo, A., Poli, G. and Serri, G. (1988) Petrogenesis of orenditic and kamafugitic rocks from Central Italy. The Canadian Mineralogist, 26, 45–65.Google Scholar
Perini, G., Tepley III, F.J., Davidson, J.P. and Conticelli, S. (2003) The origin of K-feldspar megaerysts hosted in alkaline potassic rocks from post-orogenic setting: a track for low-pressure processes in mafic magmas. Lithos, 66, 223–240.CrossRefGoogle Scholar
Poli, G. (1992) Geochemistry of Tuscan Archipelago Granitoids: Central Italy: the role of hybridization processes in their genesis. Journal of Geology, 100, 41–56.CrossRefGoogle Scholar
Poli, G., Manetti, P. and Tommasini, S. (1989) A petrological review on Miocene-Pliocene intrusive rocks from Southern Tuscany and Tyrrhenian Sea (Italy). Periodico di Mineralogia, 58, 109–126.Google Scholar
Poli, G., Tommasini, S. and Halliday, A.N. (1996) Trace element and isotopic exchange during acid-basic magma interaction processes. Transactions of the Royal Society of Edinburgh: Earth Sciences, 87, 225–232.CrossRefGoogle Scholar
Ramirez, J.A. and Menendez, L.G. (1999) A geochem-ical study of two peraluminous granites from south-central Iberia: the Nisa-Albuquerque and Jalama batholiths. Mineralogical Magazine, 63, 85—104.CrossRefGoogle Scholar
Reid, J.B., Evans, O.C. and Fates, D.G. (1983) Magma mixing in granitic rocks of the central Sierra Nevada, California. Earth and Planetary Science Letters, 66, 243–261.CrossRefGoogle Scholar
Rocchi, S., Westerman, D.S., Dini, A., Innocenti, F. and Tonarini, S. (2002). Two-stage growth of laccoliths at Elba Island, Italy. Geology, 30, 983–986.2.0.CO;2>CrossRefGoogle Scholar
Rossi, IN., Toselli, A.J., Saavedra, I, Sial, A.N., Pellitero, E. and Ferreira, V.P. (2002) Common crustal source for contrasting peraluminous facies in the early Paleozoic Capillitas Batholith, NW Argentina. Gondwana Research, 5, 325–337.CrossRefGoogle Scholar
Slaby, E. and Gotze, J. (2004) Feldspar crystallization under magma-mixing conditions shown by cathodo-luminescence and geochemical modelling—a case study from the Karkonosze pluton (SW Poland). Mineralogical Magazine, 68, 561—577.CrossRefGoogle Scholar
Slaby, E., Galbarczyk-Gasiorowska, L., Seltmann, R. and Miiller, A. (2007) Alkali feldspar megacryst growth: geochemical modelling. Mineralogy and Petrology, 89, 1–29.CrossRefGoogle Scholar
Sparks, R.SJ. and Marshall, L. (1986) Thermal and mechanical constraints on mixing between mafic and silicic magmas. Journal of Volcanology and Geothermal Research, 29, 99–124.CrossRefGoogle Scholar
Swanson, S.E. (1977) Relation of nucleation and crystal growth rate to the development of granitic textures. American Mineralogist, 62, 966–978.Google Scholar
Tate, M.C., Clarke, D.B. and Heaman, L.M. (1997) Progressive hybridisation between late Devonian mafic-intermediate and felsic magmas in the Meguma Zone of Nova Scotia, Canada. Contributions to Mineralogy and Petrology, 126, 401–415.CrossRefGoogle Scholar
Tobisch, O.T., McNulty, B.A. and Vernon, R.H. (1997) Microgranitoid enclave swarms in granitic plutons, Central Sierra Nevada, California. Lithos, 40, 321–339.CrossRefGoogle Scholar
Trevisan, L. and Marinelli, G. (1967) Carta geologica dell'Isola d'Elba (scala 1:25000). Consiglio Nazionale delle Ricerche. Google Scholar
Vernon, R.H. (1986) K-feldspar megacrysts in granites — phenocrysts, not porphyroblasts. Earth-Science Reviews, 23, 1–63.CrossRefGoogle Scholar
Vernon, R.H., Etheridge, M.A. and Wall, VJ. (1988) Shape and microstructure of microgranitoid enclaves: indicators of magma mingling and flow. Lithos, 22, 1–11.CrossRefGoogle Scholar
Wada, H., Harayama, S. and Yamagushi, Y. (2004) Mafic enclaves densely concentrated in the upper part of a vertically zoned felsie magma chamber: the Kurobegawa granitic pluton, Hida Mountain Range, central Japan. Geological Society of America Bulletin, 116, 788–801.CrossRefGoogle Scholar
Waight, T.E., Maas, R., and Nicholls, LA. (2000) Fingerprinting feldspar phenocrysts using crystal isotopic composition stratigraphy: implications for crystal transfer and magma mingling in S-type granites. Contributions to Mineralogy and Petrology, 139, 227–239.CrossRefGoogle Scholar
Waight, T.E., Maas, R. and Nicholls, LA. (2001) Geochemical investigations of microgranitoid enclaves in the S-type Cowra Granodiorite, Lachlan Fold Belt, SE Australia. Lithos, 56, 165–186.CrossRefGoogle Scholar
Wark, D.A. and Stimac, J.A. (1992) Origin of mantled (rapakivi) feldspars: experimental evidence of a dissolution and diffusion-controlled mechanism. Contributions to Mineralogy and Petrology, 111, 345–361.CrossRefGoogle Scholar
Westerman, D.S., Dini, A., Innocenti, F. and Rocchi, S. (2004) Rise and fall of a nested Christmas-tree laccolith complex, Elba Island, Italy. Pp. 195–213 in: Physical Geology of High-level Magmatic Systems(Breitkreuz, C. and Petford, N., editors). Special Publication, 234. Geological Society, London.Google Scholar
Wiebe, R.A., Smith, D., Sturm, M., King, E.M. and Seckler, M.S. (1997) Enclaves in the Cadillac Mountain granite (Coastal Maine): samples of hybrid magma from the base of the chamber. Journal of Petrology, 38, 393–423.CrossRefGoogle Scholar