1991

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Alphabetical by the first author's surname 

BAKUN-CZUBAROW, NONNA
Institute of Geological Sciences, Polish Academy of Sciences, Żwirki i Wigury 93, 02-089 Warszawa, Poland
ON THE POSSIBILITY OF OCCURRENCE OF QUARTZ PSEUDOMORPHS AFTER COESITE IN THE ECLOGITE-GRANULITE ROCK SERIES OF THE ZLOTE MOUNTAINS IN THE SUDETES (SW POLAND)
Archiwum Mineralogiczne v. 47, no. 1, p. 5-16, 1991

Presumed quartz pseudomorphs after coesite occur as tiny (<100 micrometers in in diameter) inclusions in garnet in few omphacite granulite and eclogite samples from the Zlote Mountains eclogite-granulite rocks in the Sudetes. The rounded inclusions are quartz aggregates polycrystalline composed of randomly oriented quartz grains. In the host garnets radial and sometimes concentric fractures can be seen. Similar inclusions were observed in omphacite granulite from the vicinity of Zoblitz in Erzgebirge. The implied pre-existence of coesite in the Zlote Mountains rocks points to the probable early-Variscan very-high-pressure (VHP > 2.8 GPa) pre-granulitic stage of metamorphism in the clockwise P,T,t trajectory the rocks followed. It is suggested as one of the possible interpretations that the Variscan geodynamics in high-grade metamorphic belts of Bohemian Massif can be based on the very deep subduction and rapid eduction of contincnial crust according to the model proposed by Andersen et al. (1991).
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GALUSKIN, EVGENIY; MOKHOV, ANDREY
Institute of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM), Academy of Sciences USSR, Staromonetny Pereulok 35, 109 017 Moscow, USSR
DIOPSIDE FROM THE SKARNS OF YAKUTIA: EVOLUTION OF HABIT AND COMPOSITION, GENESIS OF WHISKERS
Archiwum Mineralogiczne v. 47, no. 1, p. 17-39, 1991

Investigation of diopside crystals and mineral crystallisation sequence in the datolite skarns of Tas-Khaiakhtakh Mountains, Polar Yakutia, USSR; made possible to connect the changes of the diopside morphology and composition with the processes of the metasomatic alteration of the rocks. On the basis of the Korzhinskiy's (1982) theory of metasomatic zoning, the connection between pH changes of mineral-forming solution and habits of the diopside crystals was shown. This paper presents origin and a mechanism of growth of the diopside whiskers, appearing in the moment when the solutions of decreasing or almost constant pH changed to gradually higher pH values and relatively low temperature, when kinetic factors of crystal formation played an important role. The diopside whiskers formed by layer growth, influenced by surface active substances, inhibiting the prism face growth, what resulted in highly anisometric Z-elongated habits.
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LORENC, MAREK W.
Polish Academy of Sciences, Institute of Geological Sciences, Laboratory of Geology of the Sudetes, Podwale 75, 50-449 Wroclaw, Poland
REMARKS ON GENESIS OF THE KLODZKO - ZLOTY STOK INTRUSION (COMAPARATIVE STUDY BASED ON ENCLAVES)
Archiwum Mineralogiczne v. 47, no. 1, p. 79-98, 1991

Results of petrographic and chemical analyses of rocks of the Klodzko — Zloty Stok pluton show that most of them are of hybrid nature and had been formed from basic magma interacting with products of melting of the lower crust. Insignificant amounts of basic magma with its partly altered composition made magmatic mafic enclaves, occuring numerously throughout the massif. Some of them are fragments of basic injections chilled in the environment of felsic magma while the others can be attributed to necking of synplutonic basic or hybrid dykes. Rocks of the Klodzko — Zloty Stok massif are strongly metaluminous; they belong to cafemic association of the calc-alkaline series and partly to the alkaline or tholeiitic series, and correspond to pre-collision magmas. It s therefore possible, that like in the central part of the Bohemian Massif, Andean-type Hercynian intrusions may occur in Sudetes.
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MAI TRONG NHUAN
Department of Geochemistry, Hanoi State University
GEOCHEMISTRY OF PERCOLATING WATERS IN THE BASALT WEATHERING CRUST OF SOUTH VIETNAM
Archiwum Mineralogiczne v. 47, no. 1, p. 41-53, 1991

On the basis of mineral and chemical composition as well as formation condition, three types of the basalt weathering crust in South Vietnam have been distinguished: ferrosialite, ferralite and ferrite ones. Waters related to them are mostly Na-Ca and Mg-Ca-Na bicarbonate-rich.The bauxite-bearing (ferralite) and bauxite free (ferrosialite) weathering crusts differ from each another in the mineralization, contents and ratios of mobile elements (Na, K, Ca, Mg) in the percolating waters.The drainage conditions and composition of the weathering crust are the most important factors affecting the geochemical characteristics of the percolating waters in the weathering crust.
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PESZAT, CZESLAW
Department of Non-Metallic Raw Materials, Institute of Geology anil Mineral Deposits, Academy of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Krakow, Poland
MICROSTRUCTURES AND ORIGIN OF THE OXFORDIAN MICRITIC LIMESTONES IN THE SOUTHWESTERN MARGIN OF THE SWIETOKRZYSKIE MOUNTAINS (POLAND)
Archiwum Mineralogiczne v. 47, no. 1, p. 153-188, 1991

The paper presents research concerning the origin of the Upper Oxfordian micritic limestones in the southwestern margin of the Swietokrzyskie Mts. In an almost 400 m thick profile of the micritic limestones which can be subdivided into 6 complexes the composition of the micrite as well as the grain morphology do not show major changes. The grains of mean size (Mz) 1.4 up to 2.4 micrometres are almost entirely isometric and exhibit traces of rounding. Their mutual contacts are mainly concave-convex and have originated by compaction dissolving as well as in result of syntaxial growth. The facies of the micritic limestones is of limited range only to local depression of furrow character. The micrite precipitated in this furrow, derived from broadly distributed and elevated zones of biohermal rocky limestones and the interbedding ones. Its origin is mainly due to blue algae life activity. Productivity of these zones is expressed by high rate of deposition 19 cm per 1000 years whereas the rate of the micritic limestones is much lower i.e. 10.6 cm per 1000 years.
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PRZYBYLOWICZ, TERESA*; STUPNICKA, EWA**
*Institute of Geological Science, Polish Academy of Sciences, 93 Zwirki i Wigury, 02-089 Warszawa, Poland; **Warsaw University, Institute of Geology, 93, Zwirki i Wigury, 02-089 Warszawa, Poland
MANIFESTATIONS OF VOLCANISM IN ORDOVICIAN AND SILURIAN BEDS OF THE SOUTHERN PART OF SWIETOKRZYSKIE MTS
Archiwum Mineralogiczne v. 47, no. 1, p. 137-152, 1991

Ordovician and Silurian deposits in the Bardo and Daleszyce basins (Swietokrzyskie Mts) contain abundant volcanic material coming from neighbouring eruptive centres. This material had been gathering in result of activity of volcanoes connected with the same magmatic center that yielded the diabase dykes of the Klimontow anticlinorium. The presence of this material an evidence of local volcanism in this region.
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SLABY, EWA
Institute of Geochemistry, Mineralogy and Petrography, University of Warsaw, Al.Zwirki i Wigury 93, 02-089 Warszawa, Poland
PHYSICO-CHEMICAL CONDITIONS OF THE ALKALI METASOMATOSIS IN THE "APLITES" FROM SAAR-NAHE TROUGH
Archiwum Mineralogiczne v. 47, no. 1, p. 55-77, 1991

The present work verifies hitherto existing opinions about the genesis of aplites from the Saar-Nahe trough. According to those opinions, a vast majority of alkali sodium and potassium feldspars is considered to be a direct product of crystallization from the melt. Actually, these feldspars are produced in a two-stage process of alkali metasomatism. The first stage took place under conditions far from equilibrium and resulted in formation of secondary feldspars of a disordered structure, as well as corrensite and products of a non-equilibrium decomposition of Fe-Ti oxides. The second stage proceeded close to equilibrium and its effect was formation of a paragenesis of prehnite, julgoldite and ordered albite.
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WYSZOMIRSKI, PIOTR; MUSZYNSKI, MAREK
Institute of Geology and Mineral Deposits, Academy of Mining and Metallurgy Al. Mickiewicza 30, 30-059 Cracow, Poland
HEAVY MINERALS IN COARSE-GRAINED FRACTION OF LOWER SILESIAN KAOLINS
Archiwum Mineralogiczne v. 47, no. 1, p. 99-136, 1991

Heavy minerals separated from residual and sedimentary kaolins from the environs of Swidnica, Strzelin, Mirsk, Wadroze Wielkie, Boleslawiec and the foreland of Sowie Mts were studied. These minerals are as follows: zircon, titanium minerals (anatase, rutile, ilmenite and trace sphene and brookite), subordinate andalusite, sillimanite, kyanite, tourmaline, garnet, epidote, staurolite, chloritoid and topaz. The composition of the heavy mineral assemblages and their contents in different kaolins are variable what is related to petrographic type of the parent rocks.
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