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LREE distribution patterns in zoned alkali feldspar megacrysts from the Karkonosze pluton, Bohemian Massif - implications for parental magma composition

Published online by Cambridge University Press:  05 July 2018

E. Słaby ,
R. Seltmann ,
B. Kober ,
A. Müller ,
L. Galbarczyk-GąSiorowska  and
T. Jeffries
E. Słaby
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
R. Seltmann
Affiliation:
Natural History Museum, Department of Mineralogy, CERCAMS (Centre for Russian and Central EurAsian Mineral Studies), Cromwell Road, London SW7 5BD, UK
B. Kober
Affiliation:
Environmental Geochemistry, University of Heidelberg, Im Neuenheimer Feld 236, D-69120 Heidelberg, Germany
A. Müller
Affiliation:
Natural History Museum, Department of Mineralogy, CERCAMS (Centre for Russian and Central EurAsian Mineral Studies), Cromwell Road, London SW7 5BD, UK Norges Geologiske Undersøkelse, N-7491 Trondheim, Norway
L. Galbarczyk-GąSiorowska
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
T. Jeffries
Affiliation:
Natural History Museum, Department of Mineralogy, CERCAMS (Centre for Russian and Central EurAsian Mineral Studies), Cromwell Road, London SW7 5BD, UK
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Abstract

The elemental compositions of zoned alkali feldspar megacrysts from the Karkonosze pluton have been analysed and Pb isotope ratios determined using LA-ICP-MS, EMPA and TIMS. The results are used to interpret the magmatic environments within which they crystallized. Growth zones in the megacrysts show fluctuating trace element patterns that reflect a systematic relationship between incompatible LREE and compatible Ba. Chemical gradients between zones in the cores and rims of the megacrysts are not accompanied by significant variation in initial Pb isotope composition. The nucleation and crystallization of the megacrysts is interpreted as having occurred in an environment of magmatic hybridization caused by mixing of mantle and crustal components in which effective homogenization of the Pb isotope composition preceded the onset of megacryst growth. The concentrations of LREE in alkali feldspar zones were used to reconstruct hypothetical melt compositions. Some of the zones appear to have crystallized in an homogenous magmatic environment having clear geochemical affinities with end-member magmas in the Karkonosze pluton, whereas others crystallized in heterogeneous domains of magma hybridization. With the exception of Nd, zones crystallized in more homogeneous magma show LREE fractionation under near-equilibrium conditions. Trace element abundances of megacrysts grown in dynamic, homogeneous magmatic environments of the Karkonosze pluton occasionally deviate from the predicted patterns and show LREE impoverishment.

Keywords

alkali feldspar megacrystgeochemistryincompatible elementstrace-element patternmagmatic hybridizationKarkonosze plutonPoland
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 2 , April 2007 , pp. 155 - 178
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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