- Tytuł:
- Sedimentological distinction in glacigenic sediments between load casts induced by periglacial processes from those induced by seismic shocks
- Autorzy:
-
Van Loon, Antonius Johannes
Pisarska-Jamroży, Małgorzata
Woronko, Barbara - Powiązania:
- https://bibliotekanauki.pl/articles/2060257.pdf
- Data publikacji:
- 2020
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
load casts
pseudonodules
soft-sediment deformation structures
cryoturbation
seismites - Opis:
- Loading processes and the resulting load structures induced by processes related to periglacial conditions are compared to those induced by seismic shocks. The load structures themselves are relatively easily recognizable but the responsible trigger mechanism is, though depending on the geological context, commonly difficult to establish. Load structures like load casts, pseudonodules, ball-and-pillow structures and flame structures are commonly ascribed to instable density gradients within sediments and to differential loading, but their formation always requires liquefaction. In glacigenic sediments, deformation structures have most commonly been ascribed to periglacial processes (as a type of cryoturbations), but it becomes ever more clear that glacigenic sediments can, particularly during ice-front fluctuations, be affected by faulting-related earthquakes (due to glacio-isostatic adjustment), and the thus triggered seismic shocks may result in deformations, including - most commonly - load structures. We inventory the evidence that may help to distinguish, on the basis of textural and structural features, load structures with a seismic origin from those that result from periglacial processes, taking into account that truly diagnostic criteria do not exist.
- Źródło:
-
Geological Quarterly; 2020, 64, 3; 626--640
1641-7291 - Pojawia się w:
- Geological Quarterly
- Dostawca treści:
- Biblioteka Nauki
Artykuł