Wyniki wyszukiwania - BazTech

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Vestiges of Cambro-Ordovician continental accretion in the Carpathian-Balkan orogen: First evidence of the ‘Cenerian’ event in the central Serbo-Macedonian Unit

Spahić Darko, Bojić Zoran, Popović Danica, Gaudenyi Tivadar

Acta Geologica Polonica

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2021

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Vol. 71, no. 2

219--247

EN

In the Balkans, the Serbo-Macedonian Unit (SMU), Serbia, is thrust bounded by the composite Tethyan Vardar Zone and the Carpatho-Balkanides. The SMU actually emerges from beneath the Neoalpine Miocene-Pliocene deposits. Both provenance and geodynamic position of the SMU are poorly known and still debated. This paper reviews the data hitherto published and includes some new field data interpretations. The SMU is composed of a Neoproterozoic-Cambrian high-grade (para- and ortho-) gneiss with peraluminous magmatic arc components (560-470 Ma). The SMU is in the contact with Neoproterozoic upper Ordovician-Carboniferous low-grade metasedimentary succession of an accretionary wedge assembly represented by the Supragetic basement. The SMU basement became folded, sheared and metamorphosed around 490-450 Ma. Paleomagnetic data point to high southern latitudes and a peri-Gondwanan position of the SMU at that time, which concurs with glaciomarine evidence recorded from the upper Ordovician sediments at the base of an accretionary wedge succession. Based on the published data and field survey in the Stalać region, we correlate the SMU with the pre-Mesozoic gneiss terrane exposed in the Strona-Ceneri zone of the Alps. This terrane, identified as the Cenerian orogen of the Alaskan subduction type, developed at an active margin of Gondwana during middle Ordovician times. The SMU basement, with augen and migmatitic gneisses and arc-related peraluminous magmatic bodies, developed at this margin as part of the Cenerian belt or its equivalent. Such an orogenic edifice proved transient and in the earliest Silurian the SMU fragments drifted away being bound for Baltica (amalgamated Moesian microplate and Danubian terrane) to which they became accreted in the Carboniferous and included in the southern European branch of the Variscan orogen (Marginal Dacides/Carpatho-Balkanides). Despite consider-able Variscan and Alpine reworking, the pre-Variscan, Cenerian-type crustal assembly along with an inferred boundary between the magmatic arc and the accretionary wedge, accompanied by back-arc/forearc deposits, are still decipherable in the Western Balkan countries.

2

Impreza na poziomie : to ma być tradycja

Waloszczyk A.

Surowce i Maszyny Budowlane

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2017

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nr 5

24--26

PL

W czwartek 7 września w Piławie Górnej odbyła się impreza branży kruszywowej "Na poziomie 308". W kopalni amfibolitu i migmatytu efektownie zaprezentowano sprzęt Volvo i Powerscreen. We wrześniu 2015 roku w kopalni w Piławie Górnej odbyło się spotkanie branży kruszywowej "Na poziomie 308".

3

Statistical analysis of a bulk chemical composition of orthogneisses migmatites and metarhyolites from the Orlica-Snieżnik Dome, West Sudetes

Redlińska-Marczyńska A.

Geologia Sudetica

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2014

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Vol. 42

80--81

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Nowe zastosowania migmatytów z Dolnego Śląska - wybrane właściwości

Marciniszyn T.

Górnictwo Odkrywkowe

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2013

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R. 54, nr 1

52--55

PL

Poszukiwanie nowych zastosowań materiałów skalnych wymaga zwrócenia szczególnej uwagi na badania podstawowe. Obecny opis właściwości surowców skalnych oparty jest głównie na pomiarach wytrzymałości, czy ścieralności. Nowe zastosowania wymagają także innego typu badań. W tej kwestii zaproponowano badania termiczne (przewodność cieplna, rozszerzalność termiczna, szybkość wnikania fali termicznej) wsparte badaniem nasiąkliwości wodnej. Badania zostały przeprowadzone w celu wskazania nowych praktycznych zastosowań migmatytu, który jest wykorzystywany głównie jako kruszywo (kamienie drogowe i budowlane). Otrzymane wyniki pomiarów wskazują, że migmatyt może być zastosowany jako materiał konstrukcyjny, gdyż charakteryzuje się dobrymi właściwościami termicznymi jak i wizualnymi. W badaniach wyznaczono wartość współczynnika przewodności cieplnej λM=3,73[W/Km], rozszerzalności termicznej αM=5,2*10-6[K-1] oraz nasiąkliwości wodnej, który nie przekracza 0,4%.

EN

The searching of the new applications of rock materials requires to pay careful attention on basic research. The current characterization of properties of the rock materials is mainly based on measurements of strength, and also abrasion. The new possibilities of applications involve to perform other types of research. In this subject, the study of thermal properties (thermal conductivity, thermal expansion, thermal wave penetration) were carried out, as well as the water absorption measurements. The studies were done in order to identify the new practical applications of migmatite, which is mainly used as aggregate (in road or building construction). The obtained results indicate that migmatite can be used as a construction material, because of its good thermal and visual properties. The studies determined the coefficient of thermal conductivity λM = 3.73 [W/Km] and thermal expansion αM = 5.2* 10-6 [K-1], and water absorption, which does not exceed 0.4%.

5

Selected properties of amphibolites and migmatites from the G.A.M. Kluczowa Mine

Marciniszyn T., Sieradzki A.

AGH Journal of Mining and Geoengineering

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2012

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Vol. 36, no. 4

75-81

EN

In this paper we present the results of thermal conductivity, thermal expansion and water absorption measurements of the migmatite and amphibolites rocks. The studies are intended to classify migmatites and amphibolites in terms of their practical application. The results revealed that investigated materials can be used as a construction material with good thermal and visual properties.

PL

W artykule przedstawiono wyniki badań przewodności cieplnej, rozszerzalności termicznej, jak również nasiąkliwości wodnej migmatytu i amfibolitu. Przeprowadzone badania mają na celu sklasyfikowanie migmatytu i amfibolitu pod względem ich praktycznego zastosowania. Wyniki wykazały, że badane materiały skalane mogą być wykorzystane jako materiał konstrukcyjny charakteryzujący się dobrymi właściwościami termicznymi oraz wizualnymi.

6

Gneisses in the Orlica-Śnieżnik Dome, West Sudetes : a single batholitic protolith or a more complex origin?

Redlińska-Marczyńska A., Żelaźniewicz A.

Acta Geologica Polonica

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2011

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Vol. 61, no. 3

307-339

EN

Detailed structural and petrographic studies confirmed the presence of two major units of ca. 515-480 Ma gneisses in the Orlica-Śnieżnik Dome (NE Bohemian Massif) and enabled the distinction of two formations which differ in their mineral composition (modal and chemical) and structural records. An intrusive contact between rocks of the two formations was observed. The Gierałtów Gneiss Formation is composed of rocks having at least two sets of folded metamorphic foliations, with relics of compositional banding and records of early shearing prior to migmatization and metablastesis which produced quartzofeldspathic segregations (D1-D2 events). Such aggregates, even if isometric and shared (D3) may, but must not be mistaken for original augens (porphyroclasts in the original granite). Modal contents of the feldspars differ widely (20-40% of plagioclase feldspar, 16-40% of alkali feldspar) as well as their composition (Ab[0-90], An[6-38]); the biotites can be either poor or enormously enriched in Al (0.26-1.07 Al[^VI]). Such heterogeneities are consistent with the inferred metamorphic transformations of originally diversified sedimentary-volcanogenic protoliths. in contrast, the Śnieżnik Gneiss Formation is composed of metagranites, dynamically metamorphosed into the augen gneisses. They possess only one set of mylonitic foliation and one rodding lineation, both developed during a regional shear event (D3). Nearly equal modes of feldspars and quartz, uniform composition of plagioclase feldspar (An6-23) and a rather stable amount of Al (0.3-08 AlVi) in the biotites are indicative of homogenization of a granitic protolith. Anatectic provenance of the gneisses is evidenced by enclaves. Felsic microgranular enclaves are chilled fragments of the parental intrusion, while xenoliths and surmicaceous enclaves are akin to rocks of the Gierałtów Formation, thus the latter or equivalent rocks formed a migmatic envelope of the Śnieżnik granite pluton.