Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-24T00:42:53.609Z Has data issue: false hasContentIssue false
  • English
  • Français

Widespread secondary Ca garnet and other Ca silicates in the Galway Granite and its satellite plutons caused by fluid movements, western Ireland

Published online by Cambridge University Press:  05 July 2018

Bernard E. Leake
Bernard E. Leake*
Affiliation:
Department of Earth Sciences, Cardiff University, PO Box 914, Cardiff CF1 3YE
Get access Rights & Permissions [Opens in a new window]

Abstract

Widespread secondary andradite-grossular-hydrogrossular garnet, epidote, prehnite and titanite occur throughout the Galway Granite and its satellite plutons (Roundstone; Inish; Omey and Letterfrack) and even in some of the country rocks several kilometres from the granites. These minerals are not found in low CaO (<1%) granites. They formed as result of secondary fluid movements which altered the biotite, plagioclase and hornblende and also produced sericite and chlorite.

Keywords

andraditegrossularhydrogrossularepidotehornblendepretmiteGalwayIreland
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 3 , June 1998 , pp. 381 - 386
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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

Alderton, D.H.M. (1988) Calc-silicate minerals from the Dartmoor Granite. Mineral. Mag., 52, 527–9.CrossRefGoogle Scholar
Easton, A.J., Hamilton, D., Kemp, D.R.C. and Sheppard, S.M.F. (1977) Low temperature metasomatic garnets in marine sediments. Phil Trans. Roy. Soc. London, Ser. A, 286, 253–71.Google Scholar
El Desouky, M., Feely, M. and Mohr, P. (1996) Diorite-granite magma mingling and mixing along the axis of the Galway Granite batholith, Ireland. J. Geol Soc. London, 153, 361–74.CrossRefGoogle Scholar
Elias, E.M., Macintyre, R.M. and Leake, B.E. (1988) The cooling history of Connemara, Western Ireland, from K-Ar and Rb-Sr age Studies. J. Geol. Soc. London, 145, 649–60.CrossRefGoogle Scholar
Hammarstrom, J.M. and Zen, E.A. (1986) Aluminium in hornblende: an empirical igneous geobarometer. Amer. Mineral., 71, 1297–313.Google Scholar
Jenkin, G.R.T., Fallick, A.E. and Leake, B.E. (1992) A stable isotope study of retrograde alteration in SW Connemara, Ireland. Contrib. Mineral. Petrol., 110, 269–88.CrossRefGoogle Scholar
Leake, B.E. (1968) Zoned garnets from the Galway Granite and its aplites. Earth Planet. Sci. Lett., 3, 311–6.CrossRefGoogle Scholar
Leake, B.E. (1971) On aluminous and edenitic amphiboles. Mineral. Mag., 38, 389–407.CrossRefGoogle Scholar
Leake, B.E. (1974) The crystallization history and mechanism of emplacement of the western part of the Galway Granite, Connemara, Western Ireland. Mineral. Mag., 39, 498–513.CrossRefGoogle Scholar
Leake, B.E. and Ahmed Said, Y. (1994) Hornblende barometry of the Galway Batholith, Ireland: an empirical test. Mineral. Petrol., 51, 243–50.CrossRefGoogle Scholar
Leake, B.E. and Tanner, P.W.G. (1994) The geology of the Dalradian and associated rocks of Connemara, Western Ireland. Royal Irish Academy. Dublin. 96 pp.Google Scholar
Leake, B.E. et al. (1997) Nomenclature of Amphiboles: Report of the Subcommittee on Amphiboles of the International Mineralogical Association Commission on New Minerals and Mineral Names. Mineral. Mag., 61, 295–321.CrossRefGoogle Scholar
Liou, J.G., Kim, H.S. and Maruyama, S. (1983) Prehnite-epidote equilibria and their petrologic applications. J. Petrol., 24, 321–42.CrossRefGoogle Scholar
Miller, W.M., Fallick, A.E., Leake, B.E., Macintyre, R.M. and Jenkin, G.R.T. (1991) Fluid disturbed hornblende K-Ar ages from the Dalradian rocks of Connemara, Western Ireland. J. Geol. Soc. London, 148, 985–92.CrossRefGoogle Scholar
O’Reilly, C., Jenkin, G.R.T., Feely, M., Alderton, D.H.M. and Fallick, A.E. (1997) A fluid inclusion and stable isotope study of 200 Ma of fluid evolution in the Galway Granite, Connemara, Ireland. Contrib. Mineral. Petrol., 129, 120–42.CrossRefGoogle Scholar
Townend, R. (1966) The geology of some granite plutons from Western Connemara, Co. Galway. Proc. Royal Irish Acad., 65B, 157–202.Google Scholar
Tulloch, A.J. (1979) Secondary Ca-Al silicates as lowgrade alteration products of granitoid biotite. Contrib. Mineral. Petrol., 69, 105–17.CrossRefGoogle Scholar
Whitworth, M.P. and Feely, M. (1994) The compositional range of magmatic Mn-garnets in the Galway granite, Connemara, Ireland. Mineral. Mag., 58, 163–8.CrossRefGoogle Scholar
Wright, P.C. (1964) The petrology, chemistry and structure of the Galway Granite of the Carna area, Co. Galway. Proc. Royal Irish Acad., 63B, 239–64.Google Scholar