<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Metapelites from the SW part of Wedel Jarlsberg Land were progressively metamorphosed under amphibolite facies conditions followed by a Caledonian low-temperature metamorphic event under greenschist facies conditions. The latter resulted in various stages of monazite breakdown. These include monazite alterations and the formation of allanite-apatite coronas.</abstract>

Department of Mineralogy, Petrography and Geochemistry, AGH, University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland; jmajka@poczta.fm

Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków, Poland; budzyn@geos.ing.uj.edu.pl

Monazite Breakdown in Metapelites From Wedel Jarlsberg Land, Svalbard — Preliminary Report

Włodzimierz Wojciech Kowalski 1932-2005

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The metavolcanic rocks in the Gorzów Wielkopolski area (NW Poland) are andesite-basalts and andesites derived from contaminated within-plate subalkaline basalt melts. K-Ar dating of primary K-feldspar yields an extrusion age of 285±5 Ma. This new date suggests that these rocks may be the youngest dated Permo-Carboniferous volcanic rocks within the eastern margin of the North German Basin.Petrological and micro-thermometric data indicate that the volcanic rocks were altered by a sub-greenschist facies, metamorphic process that proceeded within temperatures and pressures ranging from 195-290°C and 63-96 MPa, respectively. The major metamorphic phases, corrensite, pumpellyite, laumontite and prehnite, formed due to interaction between the original volcanic rock and low-saline Na2SO4-rich hydrothermal fluids. Numerical modelling indicates fluid flow in fractures as the most probable explanation for the low-grade hydrothermal metamorphism. Model calculations suggest that the process was of short duration, <italic>ca</italic> 140-250 years. K-Ar dating reveals three Mesozoic episodes at 121±2 Ma, 188-190 Ma and 149±4 Ma that can be ascribed to the metamorphism. These ages are similar to previously determined Mesozoic ages from altered volcanic- and clastic rocks in the North German Basin and in the Polish Basin.</abstract>

Low-Grade Metamorphism of Permian Mafic Rocks From the Gorzów Wielkopolski Block (Fore Sudetic Monocline, Nw Poland): Age and Mechanism

Zygmunt Holcer 10.11.1925-17.07.2004

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The chemistry of the rare sulphosalt nuffieldite from three localities in Slovakia is examined. Nuffieldite is a part of a complex association of Bi sulphosalts accompanying tetrahedrite mineralization in some sulphide deposits in the Western Carpathians. Cu + Pb = (Bi, Sb) + vac. substitution in nuffieldite and the general formula Cu1+xPb2Bi2(PbxSbyBi1-x-y)S7 where 0 &lt; x &lt; 0.34; and 0.32 &lt; y &lt; 0.45 are confirmed. Decreasing Sb content with increasing copper content indicates a predominant substitution of Bi by Sb in nuffieldite.</abstract>

Department of Mineralogy and Petrology, Comenius University, Mlynská dolina 842 15, Bratislava, Slovakia

Department of Mineralogy, Geological Institute, University of Copenhagen, øster Voldgade 10, DK-1350 Copenhagen K, Denmark

Department of Geosciences, State University of New York, Stony Brook, NY 11794-2100, USA

A Note on the Chemical Composition of Nuffieldite Solid-Solution From Sulphide Mineralizations in the Western Carpathians, Slovakia

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Mineralogia

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