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The compositional variability of eudialyte-group minerals

Published online by Cambridge University Press:  05 July 2018

J. Schilling,
F.-Y. Wu,
C. McCammon,
T. Wenzel,
M. A. W. Marks,
K. Pfaff,
D. E. Jacob and
G. Markl
J. Schilling
Affiliation:
Mathematisch-Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrabe 56, D-72074 Tübingen, Germany
F.-Y. Wu
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
C. McCammon
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrabe 30, D-95447 Bayreuth, Germany
T. Wenzel
Affiliation:
Mathematisch-Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrabe 56, D-72074 Tübingen, Germany
M. A. W. Marks
Affiliation:
Mathematisch-Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrabe 56, D-72074 Tübingen, Germany
K. Pfaff
Affiliation:
Mathematisch-Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrabe 56, D-72074 Tübingen, Germany
D. E. Jacob
Affiliation:
Institut für Geowissenschaften und Earth System Science Research Centre, Johannes Gutenberg-Universität, JJ. Becher-Weg 21, D-55128 Mainz, Germany
G. Markl*
Affiliation:
Mathematisch-Naturwissenschaftliche Fakultät, Fachbereich Geowissenschaften, Universität Tübingen, Wilhelmstrabe 56, D-72074 Tübingen, Germany
*
*E-mail: markl@uni-tuebingen.de
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Abstract

Eudialyte-group minerals (EGM) represent the most important index minerals of persodic agpaitic systems. Results are presented here of a combined EPMA, Mössbauer spectroscopy and LA-ICP-MS study and EGM which crystallized in various fractionation stages from different parental melts and mineral assemblages in silica over- and undersaturated systems are compared. Compositional variability is closely related to texture, allowing for reconstruction of locally acting magmatic to hydrothermal processes. Early-magmatic EGM are invariably dominated by Fe whereas hydrothermal EGM can be virtually Fe-free and form pure Mn end-members. Hence the Mn/Fe ratio is the most suitable fractionation indicator, although crystal chemistry effects and co-crystallizing phases play a secondary role in the incorporation of Fe and Mn into EGM. Mössbauer spectroscopy of EGM from three selected occurrences indicates the Fe3+/ΣFe ratio to be governed by the hydration state of EGM rather than by the oxygen fugacity of the coexisting melt. Negative Eu anomalies are restricted to EGM that crystallized from alkali basaltic parental melts while EGM from nephelinitic parental melts invariably lack negative Eu anomalies. Even after extensive differentiation intervals, EGM reflect properties of their respective parental melts and the fractionation of plagioclase and other minerals such as Fe-Ti oxides, amphibole and sulphides.

Keywords

eudialyte group mineralscrystal chemistryagpaitic systems

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Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 1 , February 2011, pp. 87 - 115
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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