Temat: rhyodacite - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wiek izotopowy a wiek paleomagnetyczny ryodacytów z Zalasu koło Krakowa (S Polska)
Isotope and paleomagnetic ages of the Zalas rhyodacites (S Poland
Autorzy:: Nawrocki, J.
Lewandowska, A.
Fanning, M.
Powiązania:: https://bibliotekanauki.pl/articles/2074529.pdf
Data publikacji:: 2007
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: wiek izotopowy
paleomagnetyzm
ryodacyty
perm
Polska Południowa
isotope age
paleomagnetism
rhyodacite
Permian
southern Poland
Opis:: The single-grain U-Pb dating of most zircon grains separated from the Zalas rhyodacites gave mean age of the magma emplacement 294.2 š 2.1 Ma. Some zircons, however, displayed younger ages (268.7š 3.4 Ma), probably related to metasomatic alterations of these rocks. The paleomagnetic ages of the Zalas intrusion and its metasomatosis are slightly younger. It is probably connected with a certain error of time calibration of the reference apparent polar wander path used for paleomagnetic dating.
Źródło:: Przegląd Geologiczny; 2007, 55, 6; 475-478
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Alleged Caboniferous (Viséan) volcanism at the eastern margin of the Moravo-Silesian Basin, Kraków region, Southern Poland
Autorzy:: Lewandowska, A.
Rospondek, M. J.
Kobuszewski, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/191619.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Viséan volcanism
Culm
rhyodacite
breccias
Zalas laccolith
Opis:: The volcanic rocks, represented by clasts in the breccias occurring within the Viséan Culm sequence at Głuchówki, previously were considered to provide evidence of the earliest record of Variscan volcanism on the eastern margin of Moravo-Silesian Basin in the Kraków area. The breccias have been described as the deposits of submarine slides, accompanying the Viséan volcanic activity. This paper provides evidence of a different mode of origin. The present study, based on new field observations, combined with petrological and geochemical data, showed that volcanic rocks are major framework constituents of a breccia and are accompanied by clasts of spotty hornfels and Culm mudstone. Some clasts originated in erosion of the nearby Permian Zalas rhyodacite laccolith and the spotty hornfelses of the contact aureole, while other clasts came from the Culm mudstones. The breccia framework components are not rounded and poorly rounded, which reflects their short distance of transport. Therefore, an alternative scenario for the genesis of the breccia is proposed. The breccias represent material deposited in erosional pockets formed along the bedding of the Culm mudstones. The red iron oxide shells around clasts may indicate weathering in a warm continental climate, thus constraining the breccia formation to either the Permian or the Early or Late Triassic. Thus, the only well documented Viséan igneous rock in the study area remains the diabase, known from the Klucze borehole. Conversely, no volcanic rocks of this age have been documented in the area under consideration.
Źródło:: Annales Societatis Geologorum Poloniae; 2018, 88, 1; 59-69
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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