- Tytuł:
-
Lower Jurassic spiculite series from the Križna Unit in the Western Tatra Mts, WesternCarpathians, Poland
Dolnojurajskie spikulity jednostki kriżniańskiej w Tatrach Zachodnich, Karpaty Zachodnie, Polska - Autorzy:
- Jach, R.
- Powiązania:
- https://bibliotekanauki.pl/articles/191369.pdf
- Data publikacji:
- 2002
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Tematy:
-
spiculites
crinoidal limestones
siliceous sponges
Lower Jurassic
Tatra Mts. - Opis:
- Lower Jurassic spiculite series was studied in the Polish part of the Križna Unit in the Western Tatra Mts. This series consists of interbedded spiculites and crinoidal limestones. The spiculites are built almost entirely of siliceous sponge spicules belonging to Hexactinellida and Demospongiae classes. The prolific growth of siliceous sponge community was caused by favourable topographic and bathymetric conditions and by increased content of dissolved silica in the seawater. The spicules were not transported. Crinoidal limestones intercalating with spiculites are composed predominantly of crinoidal ossicles redeposited from shallower parts of the basin by gravity currents generated by storm events. The deposits of the studied series reveal a shallowing upward trend, marked by upward gradual replacement of hexactinellids by demosponges and by thickening and coarsening of the crinoidal limestone layers.
- Źródło:
-
Annales Societatis Geologorum Poloniae; 2002, 72, No 2; 131-144
0208-9068 - Pojawia się w:
- Annales Societatis Geologorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł