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Feldspar crystallization under magma-mixing conditions shown by cathodoluminescence and geochemical modelling – a case study from the Karkonosze pluton (SW Poland)

Published online by Cambridge University Press:  05 July 2018

E. Słaby  and
J. Götze
E. Słaby*
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, Warsaw University, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
J. Götze
Affiliation:
Institute of Mineralogy, TU Bergakademie Freiberg, Brennhausgasse 14, D-09596 Freiberg, Germany
*
*E-mail: E.Slaby@uw.edu.pl
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Abstract

Feldspars from the Karkonosze pluton (SW Poland) display many features compatible with magma mixing. The mixing hypothesis has been tested using a geochemical mass balance law resulting in two possible paths of magma hybridization. Based on the results of the geochemical calculation, feldspar samples have been chosen along both mixing lines for cathodoluminescence (CL) investigation which was used as the main tool for the reconstruction of their crystallization path. Changes in the conditions of nucleation and crystallization of the feldspars as well as their movement within the magma chamber have been recognized due to different luminescence characteristics. These changes in the conditions of crystallization obtained by CL allow a precise determination of the genetic affinity of the samples to more mafic or more felsic environments.

The results of the present study proved CL to be a valuable tool for the study of crystal-growth morphologies in a dynamic, turbulent environment and also as a geochemical tool for the reconstruction of various petrogenetic mechanisms (e.g. magma hybridization). Accordingly, the combination of CL with geochemical modelling provides corresponding information about magma evolution in an open system.

Keywords

cathodoluminescenceKarkonosze plutonPolandfeldsparmagma mixing
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 4 , August 2004 , pp. 561 - 577
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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