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1
Content available Odporność na polerowanie kruszyw uzyskanych ze skał magmowych i metamorficznych do nawierzchni drogowych
Duszyński Andrzej, Jasiński Wiktor, Pryga-Szulc Aneta
Przegląd Geologiczny
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2021
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Vol. 69, nr 10
680--686
EN
The paper deals with aggregates produced from igneous and metamorphic rocks to indicate their specificity related to the possibility of using as high-value aggregates for road construction, taking into account the skid resistance. The skid resistance of the road surface is a result of its microtexture and macrotexture. Among the aggregate characteristics that can be measured in the laboratory is the polishing resistance of PSV, which can be related to the microtexture. The current regulations on skid resistance define the required PSV values of aggregates and aggregate mixtures for asphalt and cement pavements. Aggregates made of igneous and metamorphic rocks are characterized by high compressive strength and are the basic aggregates for road surfaces. Attention was paid to the influence of petrographic features related to the type and structure of the rock, as well as the degree of crystallization of components, size and proportion of rock-forming components. This is illustrated by exemplary igneous and metamorphic rocks. Research on the PSV polishing resistance of aggregates from igneous and metamorphic rocks was carried out at the Road and Bridge Research Institute - Branch Wrocław (IBDiM).
2
Content available Structural control of mass movements on slopes formed of magmatic and metamorphic rocks : the case study of Wielisławka Mt. (SW Poland, Sudetes Mts.)
Kowalski Aleksander, Kasza Damian, Wajs Jarosław
Geological Quarterly
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2019
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Vol. 63, No. 3
460--477
EN
We indicate the structural controls on, and provide an evolutionary model of, mass movements which developed on the slopes of a rhyolitic lava dome built of massive, sub-intrusive Permian rhyolites and its low-grade metamorphic cover, comprising Ordovician and Silurian sericite schists and metacherts (greenschist facies). The phenomena studied occur on the low-altitude, dome-like Wielisławka Mt. (370 m a.s.l.) in the Western Sudetes, SW Poland. A multidisciplinary approach involving geological and geomorphological fieldwork, LiDAR-based geomorphometric analyses, as well as analyses based on data obtained from terrestrial laser scanning (TLS), performed within old adits and shafts in the landslide area, have allowed determination of the origin and recent extent of the landslide phenomena. The geometry and development of the slip surface are closely linked with measured, existing discontinuities within the massif. As they enable observation of the initial stages of mass movement in the excavations within the cover rocks of the rhyolitic massif, the old adits and shafts are unique objects for the observation and reconstruction of landslide processes.
3
Content available remote Improved petrographic-coded model and its evaluation to determine a thermal conductivity log
Gegenhuber N., Kienler M.
Acta Geophysica
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2017
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Vol. 65, no. 1
103--118
EN
Thermal conductivity is one of the crucial properties for thermal modelling as well as tunnelling or geological modelling. Available data are mainly from laboratory measurements. Therefore, additional ways, such as correlations with other properties to derive the petrophysical parameter, will be an advantage. The research presented here continues and improves the petrographic-coded model concept with an increased set of data, including a variety of lithologies, and, furthermore, the correlations, including the electrical resistivity. Input parameters are no longer taken from the literature, but are derived directly from measurements. In addition, the results are compared with other published approaches. Results show good correlations with measured data. The comparison with the multi-linear regression method shows acceptable outcome, in contrast to a geometric-mean method, where data scatter. In summary, it can be said that the improved model delivers for both correlation (compressional wave velocity and electrical resistivity with thermal conductivity) positive results.
4
Content available remote The origin and role of a calcite-filled microcrack generation in a metamorphic crystal line complex: The characterization of a fossilised seismic permeability system
Dabi G, Bajnóczi B, Schubert F., Tóth T M
Geologia Sudetica
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2014
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Vol. 42
8--9
5
Content available Wstępna charakterystyka petrograficzna kompleksu krystalicznego z kalcyfirami z doliny Sludianki (Bajkał, Rosja)
Huber M., Lata L., Hałas S.
Biuletyn Państwowego Instytutu Geologicznego
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2014
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nr 458
25--30
PL
Przedmiotem analizy są skały z doliny znajdującej się w sąsiedztwie kamieniołomu Pieriewał w miejscowości Sludianka, w górach Chamar-Daban. Badania przeprowadzono przy użyciu mikroskopu optycznego i elektronowego z wykorzystaniem metody rentgenografii strukturalnej (XRD). W odsłonięciach, w zboczach doliny, występują łupki krystaliczne, marmury oraz żyły granitoidowe. Znajdują się tam też kalcyfiry bogate we flogopit, apatyt i diopsyd. Kompleks skał metamorficznych został przeobrażony w warunkach facji kordierytowo-biotytowo-almadynowej. Protolitem tych skał były prawdopodobnie osady piaskowcowo-mułowcowe. W utworach tych występują liczne skały węglanowe: diopsydowo-apatytowe kalcyfiry. W procesie odmładzania tektonicznego tego obszaru doszło do deformacji kompleksu skalnego oraz dźwigania go, a także do tworzenia licznych intruzji żyłowych.
EN
Rocks from the Slyudyanka valley (Khamar-Daban Mountain), near the Pierieval quarry, were analysed for petrographic characteristics. Rocks samples have been investigated with the use of optical and electron microscopes as well as XRD methods. The outcrops on the valley slopes reveal the presence of crystalline schists and marbles with granitoid veins. There are also calciphyres, rich in phlogopite, apatite and diopside. This complex was metamorphosed under the cordierite-biotite-almandine facies. In this rock complex, carbonate-diopside-apatite calciphyres are also present. The complex was deformed, uplifted and intruded by numerous granitoid veins during the process of tectonic rejuvenation of this area.
6
Content available remote New evidence for high-pressure metamorphic rocks in Western Svalbard
Kośmińska K., Majka J., Krumbholz M., Klonowska I., Manecki M., Czerny J.
Geology, Geophysics and Environment
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2012
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Vol. 38, no. 4
488--489
EN
During a field expeditions to Nordenskiold Land and Wedel Jarlsberg Land (western Svalbard), previously unrecognised high-grade metamorphic rocks were observed. These rocks are represented by blueschists sensu stricto and blueschist facies metapelites. In Nordeskiold Land, blueschists occur in form of isolated bodies/tectonic lenses of different size enclosed within metasediments. The rocks in question are dark green, consist mainly of reddish garnet porphyroblasts and greenish and bluish amphiboles (including ferroglaucophane). They also contain chlorite, epidote, phengite, biotite, pumpellyite, quartz and albite. Garnet forms euhedral to subhedral poikiloblasts containing voluminous inclusions of epidote, albite, quartz, amphibole and titanite. Garnet shows chemical compositional variation from Alm49Pyr1Grs33Spss17 in the cores to Alm63Pyr2Grs32Spss3 in the rims. Gradual changes in chemical zoning as well as bell-shaped Spss content profiles suggest one-step, progressive garnet growth. P-T estimates based on thermodynamic modeling (using Perple_X'O7) in the NCKFMMnASHT system suggest peak pressure conditions of ca. 20 kbar and 480°C. P-T estimates are based on garnet and phengite compositional isopleths and stability field of the paragenetic assemblage (Chl-Ph-Ampl-Amp2-Grt-Spn). Tectonically, the whole area is characterized by a moderate, 50°-dipping of SO and SI (the main metamorphic foliation) to the north. Deviations from this direction are small and occur only locally. They are mostly caused by the presence of rigid metamafic bodies, around which the common orientation of the bedding and the metamorphic foliation is disturbed. The observed stretching lineations plunge towards the N-NNE and are therefore in very good agreement with the orientation of SO and SI. Moreover, shear sense indicators such as commonly observed sigma elasts clearly indicate a transport direction from the north to the south. The structural observations are in good agreement with those collected south of the Nordenskiold Land, in the northern part of Wedel Jarlsberg Land (Antoniabreen area), where high grade augen gneisses and metapelites thrusted onto typical low-grade rocks of SW Svalbard occur. The metapelites contain mainly garnet, muscovite, biotite, chlorite and quartz. Most of the garnet porphyroblasts show two distinct growth zones. Garnet-I (Alm64Pyr6Grs9Spss21) represents the inner growth zone, forming inclusion-rich garnet core and garnet-II (Alm52Pyr2Grs30Spss16) builds the outer growth zone, forming euhedral garnet rims. Some of the smaller garnet porphyroblasts show only a single growth zone (representing grt-II). Preliminary P-T estimates based on thermodynamic modeling in the NCKFMMnASHT system indicate the growth of garnet-I at ca. 550°C and relatively low pressure (ca. 5 kbar), whereas garnet-II grew at ca. 500°C and 12 kbar. The P-T estimates for garnet-I are based on garnet, biotite and plagioclase compositional isopleths and stability field of the paragenetic assemblage (Bt-Chl-Pl-Ms-Grt), whereas for garnet-II on the garnet and muscovite isopleths and stability field of the assemblage (Bio-Chl-Ms-Grt-Ab). We suggest that the growth of garnet-I is connected to the Late Neoproterozoic Torellian event, while garnet-II has been growing under blueschist facies conditions, hence most probably during the Caledonian orogeny. Tectonic observations and P-T conditions are similar in both studied areas. It suggest that vast parts of the Caledonian basement of Nordeskiold Land and northern Wedel Jarlsberg Land were metamorphosed under high pressure conditions. These blueschist facies rocks may be an equivalent of the high pressure unit known from Oskar II Land (Motalafjella region), occurring to the north from the research area. Further, detailed petrological and geochronological studies to verify this hypothesis are in progress.
7
Content available remote New data on the petrology of metamorphic rocks from the Kuekvun' uplift (North Chukotka area)
Kulyukina N. A., Tikhomirov P. L., Yapaskurt V. O.
Geology, Geophysics and Environment
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2012
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Vol. 38, no. 4
490--91
EN
Kuekvun' uplift is located within Chaun folded zone of Mesozoic Verkhoyansk--Chukchi foldbelt. Outcropped metamorphic rocks were explored here in 1960-1970s during the geological surveying. On latest geological maps (scale is 1:500,000) metamorphic rocks of Kuekvun' uplift are dated Devonian-Middle Carboniferous (based on palaeontological data). Metamorphic rocks of the Kuekvun' uplift are represented by gneisses and schists formed from Mid-Palaeozoic sedimentary units, composed by fine-grained clastic rocks with minor carbonates. The clastic material contains an admixture from a volcanic source of mafic to intermediate composition. Almost all of the rocks were changed in the amphibolite facies. Two samples of plagiogneisses, which represent both the marginal and the central structural zones of the uplift has been a subject of a detailed study. Metamorphism temperature estimation has been done using garnet-biotite (Perchuk & Lavrent'eva 1983) and garnet-staurolite (Perchuk 1991) geothermometers. The mineral paragenesis and the composition of coexisting garnet, biotite and staurolite indicate the temperature of metamorphism of 560-600°C, and the pressure of 2.5-4 kbar, which corresponds to the depth of 8-12 km. Such conditions imply the relatively high geothermal gradient (nearly 60°C/km), approaching that for periplutonic metamorphic aureoles. Garnets from the marginal and the central zones of the uplift reveal a similar zonation pattern. The only notable difference is the presence of compositionally contrasting Caenrichedrim in garnets from the central zone. Such rims could result from the evolution of the entire metamorphic complex, but they could also be related with local processes, like the crystallization of granitic plutons, which are widespread within the observed area.
8
Content available remote Metamorphic evolution of the Seve Nappe complex in the Snasahogarna area, Swedish Caledonides
Rosen A., Majka J., Klonowska I.
Geology, Geophysics and Environment
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2012
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Vol. 38, no. 4
521--522
EN
The Middle Seve Nappe in the Snasahogarna mountains, western Jamtland, Sweden, is composed of high grade metamorphic rocks emplaced in far-travelled nappes. The investigation of these paragneisses, derived from the Baltica margin, can contribute information about the subduction and exhumation processes, which controlled the formation of the Seve Nappe Complex (SNC) in the Scandinavian Caledonides. Recent studies in other parts of the orogen have shown that the rocks of the SNC likely have experienced pressures higher than what was previously described (Janak et al. 2012, Klonowska et al. in press). These latest PT studies along with geochronological dates available suggest that the collision between Baltica and Laurentia has commenced c. 30 m.y. earlier (at ca. 450 Ma) than generally accepted. Samples of kyanite- and garnet-bearing meta-sediments were collected along a profile at Tvaraklumparna (Snasahogarna area) and investigated in thin sections using light microscopy followed by BSE imaging, WDS analysis and Raman spectroscopy. Preliminary results show that dominant garnet reaches up to 7 mol. % of Grs content. The garnet commonly contains inclusions of quartz surrounded by radial cracks and grains of polycrystalline quartz. More rare are inclusions of kyanite and white mica with a Si-contents reaching 3.34 a.p.f.u. Detailed studies of garnet revealed dense areas of micrometer size inclusions exhibiting negative crystal shape present in the core regions. Raman studies suggest these inclusions are at least partly formed by microdiamond. Textural evidence of peak metamorphic conditions reaching the stability field of coesite together with microdiamonds preserved in garnet cores confirms that the Seve Nappe crustal rocks of the Snasahogarna area has undergone ultrahigh pressure metamorphism.
9
Content available remote Rozkład stężeń radonu w wodach podziemnych metamorfiku Lądka-Śnieżnika
Adamczyk-Lorenc A., Goldsztejn P.
Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Studia i Materiały
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2005
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Vol. 113, nr 31
3-10
PL
W pracy prześledzono rozkład radonu na obszarze masywu metamorficznego Lądka-Śnieżnika. Badania stężeń radonu przeprowadzono w Laboratorium Hydrogeologicznym w Instytucie Górnictwa Politechniki Wrocławskiej przy użyciu komory jonizacyjnej AlphaGUARD niemieckiej firmy Genitron Instruments GmbH.
EN
Paper presents radon concentration distribution in ground waters of Ladek-Snieznik metamorphic unit. Radon concentration laboratory tests were made in Hydrogeotogical Laboratory in Institute of Mining of Wroclaw University of Technology by means of ionization chamber Alpha GUARD made by Genitron instruments GmbH.
10
Content available remote The palynological and stratigraphic considerations on metamorphosed formations of the Maramures Mountains in Romania
Horaicu C.
Biuletyn Państwowego Instytutu Geologicznego
|
2001
|
nr 396
65-65
11
Content available remote Sedimentary structures in metamorphic rocks, a case study from the Tauern Window (Alps, Austria)
Hoeck V., Ślączka A.
Biuletyn Państwowego Instytutu Geologicznego
|
2001
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nr 396
64-64
12
Content available remote Petrology of the Palaeozoic metamorphic rocks in the area between the Mlava and Pek Rivers (Eastern Serbia)
Radovic M.
Biuletyn Państwowego Instytutu Geologicznego
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2001
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nr 396
128-128
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