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Wyszukujesz frazę "Middle Triassic dolomite" wg kryterium: Temat


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Tytuł:
Kamienie i znaki apotropaiczne w murach romańskich kościołów w Siewierzu i Mokrsku Dolnym
Stones and apotropaic marks in the walls of the Romanesque churches in Siewierz and Mokrsko Dolne (S Poland)
Autorzy:
Bromowicz, Jan
Magiera, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2074300.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
okres romański
kamieniarstwo
dolomity triasu środkowego
wapień pińczowski
znaki apotropaiczne
Romanesque period
masonry
Middle Triassic dolomite
Pińczów limestone
apotropaic marks
Opis:
Sacral edifices, in particular churches, no matter an epoch, were created of the most imposing and durable building material, mostly stone, available in the area or imported. Identification of the stone is crucial for conservation and reconstruction. However, in many cases, it is not done properly. Thorough mineral and geological studies on the stones and their provenance are thus strongly advisable. Romanesque churches in Siewierz and Mokrsko have recently been subject to such studies. They are located in different geological regions, which obviously reflected in different stones used for their construction. Church in Siewierz (founded probably at the beginningof the twelfth century) was constructed mainly of well-shaped regular blocks of local “Diplopora” dolomite (Middle Triassic). Only a few (out of a few hundred) blocks represent sandstone. Their provenance is unclear (Carboniferous or Lower Triassic sandstones that occur SW of Siewierz?). Church in Mokrsko (erected probably in the first quarter of the thirteenth century) was originally built of also well-shaped regular blocks of limestone and sandstone. They are: very typical for the area Pińczów (“Lithotamnium”), limestone (Neogene), and Upper Triassic sandstone. The former shows up on the surface a few km E of Mokrsko, the latter occurs ca 10 NE of the site. The distribution of the stones and sizes of the blocks shows some regularity. Bigger and of more uniform size blocks were used in the parts of the buildings located closer to the high altar, it is in the apse of the church in Siewierz and the presbytery in Mokrsko. It seems clearly connected with special attention paid to those parts of the temples. Moreover, resistant sandstone was used more frequently than soft limestone in lower parts of the walls in Mokrsko, more exposed to the action of water raised from the ground. Numerous caverns, holes, and crevices have been spotted on external surfaces of the dolomitic and sandstone blocks. Caverns in the dolomites (in Siewierz) developed naturally, while those in the sandstones (in Mokrsko) have obvious anthropogenic provenance. They are interpreted widely in the literature as apotropaic marks. Here it seems that excavation of stone sand and dust for magic consumption by humans or livestock or(and) ignition of holy fire could be reasons for the scratching and drilling.
Źródło:
Przegląd Geologiczny; 2022, 70, 2; 91--99
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sedimentology of the “ore-bearing dolomite” of the Kraków-Silesia region (Middle Triassic, southern Poland)
Autorzy:
Matysik, M.
Powiązania:
https://bibliotekanauki.pl/articles/191964.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
ore-bearing dolomite
epigenetic dolomitization
lead-zinc mineralization
facies pattern
peritidal and subtidal facies
Middle Triassic
muschelkalk
Upper Silesia
Polska
Opis:
The depositional history and facies heterogeneity of the epigenetically dolomitized Middle Triassic carbonates of southern Poland are poorly recognized, and existing concepts of fluid circulation entirely overlook the primary lithology as a factor controlling fluid flow. This study reconstructs the consecutive phases of Kraków-Silesia Sub-basin history in the Anisian and highlights their influence on the development of the so-called “ore-bearing dolomite”. Extensive fieldwork and microfacies analyses were carried out in order to decipher the original depositional fabric of the ore-bearing dolomites. As a rule, epigenetic dolomitization affected a horizon of porous strata, 35 m thick and resting directly on impermeable, wavy-nodular clay-rich calcilutites of the Gogolin Formation, which represent the interval of deepest and fully marine (offshore) sedimentation. The sedimentary succession of the porous strata is bipartite. The lower part (Olkusz Beds) is composed of Balanoglossites and Thalassinoides micritic firmgrounds and peloidal packstones-grainstones, representing shoreface-foreshore facies assemblages, whereas the upper part (Diplopora Beds) consists of dolocretes, rhizolites, cryptalgal laminites, peloidal packstones-grainstones and bioturbated fine-grained dolostones, formed in a system of tidal flats and lagoons. These two parts are separated by a subaerial disconformity, which marks a sequence boundary. During emersion, the underlying deposits were subjected to meteoric diagenesis, which led to the development of moldic porosity. This combination of depositional history and diagenetic alteration determined the routes of initial migration of dolomitizing solutions on the one hand, and the location of cavern formation on the other. Owing to progressive dissolution, small caverns were changed into large karstic forms, in which the ore minerals precipitated ultimately. These findings emphasize the importance of sedimentological analysis to the understanding of the evolution of the Kraków-Silesia ore province.
Źródło:
Annales Societatis Geologorum Poloniae; 2014, 84, 2; 81-112
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
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