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The analcime problem and its impact on the geochemistry of ultrapotassic rocks from Serbia

Published online by Cambridge University Press:  05 July 2018

D. Prelević ,
S. F. Foley ,
V. Cvetković  and
R. L. Romer
D. Prelević*
Affiliation:
Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Yugoslavia
S. F. Foley
Affiliation:
Institute of Geological Sciences, University of Mainz, Becherweg 21, 55099 Mainz, Germany
V. Cvetković
Affiliation:
Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Yugoslavia
R. L. Romer
Affiliation:
GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany
*
1E-mail: [email protected]
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Abstract

Tertiary ultrapotassic volcanic rocks from Serbia occasionally display low levels of K2O and K2O/ Na2O. In these rocks, analcime regularly appears as pseudomorphs after pre-existing leucite microphenocrysts. The process ofleucite transformation in Serbian ultrapotassic rocks is very thorough: fresh leucite survives only in ugandites from the Koritnik lava flows as well as in rare inclusions in Cpx. This paper focuses on the impact of ‘analcimization’ on the mineralogy and geochemistry ofthe Serbian ultrapotassic rocks, using the samples where leucite survived as a monitor for the process.

Analcimization has had a great impact on the geochemistry of the rocks, but affects only a restricted number of chemical parameters. These are the falsification of the original K2O/Na2O ratio, the decoupling oflarge-ion lithophile elements resulting in considerable depletion of Rb and K2O, but not ofBa, and sporadic, but extreme enrichment ofCs in some analcime-bearing samples (up to 900 ppm). Analcimization is also recognized by an increase in whole-rock δ18O values of ∼3% compared to fresh rocks, which correlates with the level of whole-rock hydration. Finally, the 87Sr/86Sr enrichment at nearly constant 143Nd/144Nd demonstrated by some rocks can also be explained by the analcimization ofleucite. For samples with variable 87Sr/86Sr from the same lava flow, 87Sr/86Sr values correlate with modal analcime abundance (ex-leucite), loss on ignition of whole-rock and whole-rock δ18O values. The extreme depletion in K and enrichment in Na, together with modification of other geochemical parameters, may have led to the misinterpretation of the origin and geodynamic affiliations of the Serbian ultrapotassic rocks, had the effects of analcimization not been taken into account.

Keywords

analcimizationleucitelamproiteskamafugitesalterationoxygen isotope
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 4 , August 2004 , pp. 633 - 648
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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