1990

Go to the year: 2002-2001 2000 1999 1998 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981

Go to the years: 1980-1961  1960-1945  1938-1925

Alphabetical by the first author's surname 

DUBIŃSKA, ELŻBIETA*; SZAFRANEK, DAVID**
*Institute of Geochemistry, Mineralogy and Petrography, Faculty of Geology, Warsaw University, Zwirki i Wigury 93, 02-089 Warsaw, Poland; **Department of Geology, The Hebrew University of Jerusalem, Givat Ram, 91 904 Jerusalem, Israel
ON THE ORIGIN OF LAYER SILICATES FROM JORDANOW (LOWER SILESIA, POLAND)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 19-36, 1990

Schists composed of different layer silicates (chlorite, vermiculite, talc etc.) as major phases, seems to be a highly tectonised metasomatic zone between an apophyse of a Variscan granite and older serpentinite. Texture evolution of the schists and coeval changes of granite fabric were correlated with the formation of various mineral assemblages.
TOP

JUSKOWIAKOWA, MARTA; JUSKOWIAK, OLECH
Department of Petrography and Mineralogy, Polish Geological Institute, Rakowiecka 4, 00-975 Warsaw, Poland
ON THE ORTHO- AND CLINOPYROXENE ASSEMBLAGE IN THE BASIC ROCKS OF THE SUWALKI MASSIF (NE POLAND)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 5-18, 1990

Petrographic studies of the basic rocks, such as: anorthosites, norites, gabbro-norites and dioritoids (11 drillings, 10,932 m of total core length, 1419 thin sections, 123 chemical analyses) yielded the characteristics of the variability of the ortho- and clinopyroxene ratio as well as the dependence between this ratio and Fe, Mg Ca/Al distributions in the normative dark minerals. It has been recognised that the variability of the opx/cpx ratio principally resulted from the local changes in the chemical composition and is different in each rock series. The results of the research exclude the possibility of magmatic differentiation during the process of formation of the Suwalki massif. On the other hand they point to the polymetamorphic rebuilt of the differentiated supracrustal structure.
TOP

LEWANDOWSKI, PAWEŁ
Polish Geological Institute, Rakowiecka 4, 00-975 Warsaw, Poland
ANALCITISATION OF THE LOWER PERMIAN RHYOLITE TUFFS FROM THE WAMBIERZYCE REGION (MID-SUDETIC DEPRESSION)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 71-85, 1990

The Lower Permian rhyolite tuffs from the Wambierzyce region deposited in a shallow lake reservoir had undergone significant transformations that resulted in partial decalcification of plagioclases, albitization of sanidine and formation of crystals of autogenous analcite, quartz, calcite, albite and potassium feldspar. Potassium feldspar crystallised in the form of regeneration rims on plagioclasc and sanidine grains. The described transformations were caused by low-temperature hydrothermal solutions rich in sodium, silica and carbon dioxide.
TOP

PUZIEWICZ, JACEK; RADKOWSKA, MARZENA
Institute of Geological Sciences, University of Wrodaw, Cybulskiego 30, 50-205 Wroclaw, Poland
MORPHOLOGY OF THE CRYSTALS OF ZIRCON FROM PLUTONIC ROCKS OF THE NIEMCZA ZONE (SUDETES, SW POLAND)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 123-139, 1990

In the Niemcza zone (Sudetes, SW Poland) there occur biotite-hornblende granodiorites characterised by penetrative deformational fabric and fine-grained, dark syenites/diorites (the Pilawa Górna quartz syenite, the Przedborowa quartz monzodiorite and plagioclase-pyroxene-biotite rock called vaugnerite from Kozmice). Crystals of zircon occurring in all those rocks are euhedral. The forms of zircon crystals occurring in the medium-grained granodiorites are typical of granitic rocks of mixed, mantle-crustal origin, which came into being through melting of rock series consisting of continental crust-derived rocks plus basalts. Those zircon crystal forms indicate to the crystallisation temperature of about 800°C. The forms of zircon crystals from the Kozmice vaugnerite and from the Pilawa Górna quartz syenite are similar to those occurring in charnockites. They indicate crystallisation temperatures of 800-850°C. Crystals of zircon from the Przedborowa quartz monzodiorite are typical of tonalites and quartz gabbro-diorites. Their forms are indicative of crystallisation temperature of 750-800°C.

Zircon crystals from the Kosmin granodiorite (A), Kozmice granodiorite (B) and Przedborowa quartz monzodiorite (C), SEM images.

TOP

RYKA, WACŁAW
Polish Geological Institute, Rakowiecka 4, 02-519 Warsaw, Poland
PRE-KARELIAN ROCKS IN WARMIA (NE POLAND)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 37-54, 1990

Pre-Karelian metamorphic structures in Warmia can be found among Gothian rapakivi granitoids. They are fragments of a broken granulite group belonging to the Ciechanów fold zone. Pre-Karelian rocks make up structural elevations from 8 to 15 km in diameter which are built mainly of enderbites and charno-enderbites, and possibly also older charnockites that are strongly granitised and transformed into metasomatic granitoids, migmatites and younger charnockites. Petrographic studies revealed in them numerous traces of textures and structures, relicts of minerals older than Gothian granitisation (hypersthene, antiperthite, zircon) and differentiated chemical composition.
TOP

SŁABY, EWA
Institute of Geochemistry, Mineralogy and Petrology of the Warsaw University, Zwirki i Wigury 93, 02-089 Warsaw, Poland
ADULARIA FROM MIEKINIA (S POLAND)
Archiwum Mineralogiczne v. 46, no. 1-2, p. 55-69, 1990

Four secondary phases: adularia, illite, kaolinite and calcite have been identified in plagioclase from the rhyodacite from Miekinia. Adularia is characterized by a selective inheritance of twinnings after plagioclase, variable optic axial angle observed in individual crystals and across the vertical section of the intrusion, and by the sector structure. Degree of the development of the sector structure is a function of the kinetic conditions of its formation, and, first of all, of the rate of crystal growth. Adularia forms parageneses with layer silicates and calcite; probable temperature of the formation of these parageneses has been estimated to be 120-170°C. The present paper discusses differences and similarities between altered rhyodacites from Zalas and Miekinia.

Adularia (Ad) replacing primary plagioclase (P-Pl), nicols crossed.

TOP

SŁONKA, TADEUSZ
Institute of Inorganic Technology and Mineral Fertilizers, Technical University of Wroclaw, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
INTERCALATED TUROSZÓW CLAY, ITS PREPARATION, PROPERTIES AND USAGE
Archiwum Mineralogiczne v. 46, no. 1-2, p. 5-18, 1990

Complexes of kaolinite from Turoszow clays with hydrazine, formamide, carbamide, pyridine and imidazole have been obtained. The X-ray spectra, IR absorption spectra and curves of thermal analysis indicate that the product of enrichment of clay from the bed A of the Turoszow mine contains kaolinite with structural arrangement of an intermediate stage. Intercalated complexes with hydrazine, formamide and carbamide were obtained by direct blending of reagents, and complexes with pyridine and imidazole exclusively by the indirect method. The course of vulcanisation and the results of strength tests of a rubber mix obtained from the complex with carbamide as a filler indicate that intercalated complexes of kaolinite from Turoszow clay may serve as reinforcing fillers and simultaneously as accelerators of vulcanisation of rubber mixes.
TOP

SMULIKOWSKI, WITOLD
Institute of Geological Sciences, Polish Academy of Sciences, Zwirki i Wigury 93, 02-089 Warsaw, Poland
CHLORITOID-BEARING SCHISTS FROM CHAIL FORMATION NEAR GOPESHWAR - GARHWAL HIMALAYA
Archiwum Mineralogiczne v. 46, no. 1-2, p. 87-100, 1990

On the basis of bulk chemical analyses the grey, most often dotted schists, being a part of the Chail formation near Gopeshwar may be considered as mixed sedimentary (clay) and intermediate to basic pyroclastic rocks, metamorphosed under conditions of medium-pressure transitional greenschist/amphibolite facies. Electron probe analyses of Fe-chloritoid, almandine, chlorite, muscovite, biotite and magnetite are given. A limited significance of chloritoid as an indicator of the conditions of metamorphism is discussed. The postkinematic recrystallisation of rocks could have taken place due to the action of fluids penetrating the rocks close to the zones of intense movement.
TOP

WIEWIÓRA, ANDRZEJ; WILAMOWSKI, ANDRZEJ
Institute of Geological Sciences, Polish Academy of Sciences, Zwirki i Wigury 93, 02-089 Warsaw, Poland
AMESITE FROM TAPADLA NEAR SOBOTKA (LOWER SILESIA): CALCULATED X-RAY POWDER DIFFRACTION PATTERNS
Archiwum Mineralogiczne v. 46, no. 1-2, p. 101-108, 1990

The structure analysis data for amesite from Tapadla, Sudetes, Poland (Wiewióra et al., 1990) have been used to determine a fully descriptive symbol |0_*3_-| and to calculate X-ray powder diffraction pattern for this polytype. The fully descriptive symbol shows that the structure is non-MDO contrary to the MDO structure of amesite from Saranovskoye refined by Anderson and Bailey (1981). The calculated powder diffraction pattern of non-MDO amesite gives very similar distribution of 13l,20l intensities to these of MDO polytype from Saranovskoye, proving subfamily D. The essential differences are in the d values and in the distribution of 02l,04l,11l intensities characteristic for the given stacking sequences different in the both compared structures. Thus, powder pattern may be used to differentiate between the two structures. In practice some difficulties in identification may arise due to the phenomenon of the semi-random stacking, common for the trioctahedral 1:1, responsible for smearing and weakening of these diffractions in natural specimens. Comparison of the observed and calculated powder diffractograms helps to overcome these difficulties.
TOP

BACK