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Péter Árkai Institute for Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary
H-1112, Budapest, Budaörsi út 45, Hungary, phorvath@geochem.hu

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Kenneth J. T. Livi The Morton K. Blaustein Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, 21218, USA, klivi@jhu.edu

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Péter Horváth Institute for Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary
H-1112, Budapest, Budaörsi út 45, Hungary, phorvath@geochem.hu

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Abstract

Metamorphic mineral assemblages in low-temperature metaclastic rocks often contain paragonite and/or its precursor metastable phase (mixed K-Na-white mica). Relationships between the bulk rock major element chemistries and the formation of paragonite at seven localities from Central and SE-Europe were studied, comparing the bulk chemical characteristics with mineral assemblage, mineral chemical and metamorphic petrological data. Considerable overlaps between the projection fields of bulk chemistries of the Pg-free and Pg-bearing metaclastic rocks indicate significant differences between the actual (as analyzed) and effective bulk chemical compositions. Where inherited, clastic, inert phases/constituents were excluded, it was found that a decrease in Na/(Na+Al*) and in K/(K+Al*) ratios of rocks favors the formation and occurrence of Pg and its precursor phases (Al* denotes here the atomic quantity of aluminum in feldspars, white micas and “pure” hydrous or anhydrous aluminosilicates). In contrast to earlier suggestions, enrichment in Na and/or an increase in Na/K ratio by themselves do not lead to formation of paragonite. Bulk rock chemistries favorable to formation of paragonite and its precursor phases are characterized by enrichment in Al and depletion in Na, K, Ca (and also, Mg and Fe2+). Such bulk rock chemistries are characteristic of chemically “mature” (strongly weathered) source rocks of the pelites and may also be formed by synand post-sedimentary magmatism-related hydrothermal (leaching) activity. What part of the whole rock is active in determining the effective bulk chemistry was investigated by textural examination of diagenetic and anchizone-grade samples. It is hypothesized that although solid phases act as local sources and sinks, transport of elements such as Na through the grain boundaries have much larger communication distances. Sodium-rich white micas nucleate heterogeneously using existing phyllosilicates as templates and are distributed widely on the thin section scale. The results of modeling by THERMOCALC suggest that paragonite preferably forms at higher pressures in low-T metapelites. The stability fields of Pg-bearing assemblages increase, the Pg-in reaction line is shifted towards lower pressures, while the stability field of the Chl-Ms-Ab-Qtz assemblage decreases and is shifted towards higher temperatures with increasing Al* content and decreasing Na/(Na+Al*) and K/(K+Al*) ratios.

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  • Árkai, P. 1982: Incipient regional metamorphism (on the examples of the Bükk, Uppony and Szendrő Mts., NE-Hungary). — Candidate of Science (PhD) Thesis, Budapest. (In Hungarian.).

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  • P. Árkai D. S. Ghabrial 1997 Chlorite crystallinity as an indicator of metamorphic grade of low-temperature meta-igneous rocks: A case study from the Bükk Mountains, northeast Hungary Clay Minerals 32 205 222.

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  • P. Árkai K. Balogh I. Dunkl 1995 Timing of low-temperature metamorphism and cooling of the Paleozoic and Mesozoic formations of the Bükkium, innermost western Carpathians, Hungary Geologische Rundschau 84 334 344.

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  • P. Árkai K. Balogh A. Demény I. Fórizs G. Nagy Z. Máthé 2000 Composition, diagenetic and post-diagenetic alterations of a possible radioactive waste repository site: the Boda Albitic Claystone Formation, southern Hungary Acta Geologica Hungarica 43 351 378.

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  • P. Árkai M.P. Mata G. Giorgetti D.R. Peacor M. Tóth 2000 Comparison of diagenetic and low-grade metamorphic evolution of chlorite in associated metapelites and metabasites: an integrated TEM and XRD study Journal of Metamorphic Geology 18 531 550.

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  • Árkai, P., G. Christidis, E. Manutsoglu, P. Horváth 2001: Preliminary results on the phyllosilicate reaction progress in the Permo-Triassic Ravdoucha (Tyros) beds of the External Hellenides (Crete, Greece). — In: Mid-European Clay Conference’ 01, September 9–14 2001, Stará Lesná, Slovakia, Book of abstracts, p. 3.

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  • P. Árkai S.W. Faryad O. Vidal K. Balogh 2003 Very low-grade metamorphism of sedimentary rocks of the Meliata unit, Western Carpathians, Slovakia: implications of phyllosilicate characteristics International Journal of Earth Sciences 92 68 85.

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  • Christidis, G., E. Manutsoglu, P. Árkai 2003: K-, Na- and mixed K-Na-white micas in the Ravdoucha (Tyros) Beds and the Quartzite-Phyllite Formation, Crete: an indication for disequilibrium conditions of very low-temperature metamorphism. — EUROCLAY 2003 — 10th Conference of the European Clay Groups Association, Modena, Italy, June 22–26 2003, Abstracts, p. 66.

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  • Christidis, G., E. Manutsoglu, K.J.T. Livi, P. Árkai, P. Horváth: Na-rich micas in the anchizonal metamorphic Ravdoucha beds, Western Crete, Greece. — Submitted to the European Journal of Mineralogy.

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Due to the changes in editorial functions, the Advisory Board has been terminated. The participation of former Advisory Board members is highly appreciated and gratefully thanked.

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Central European Geology
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