- Tytuł:
- Ammonite assemblage and age of the hydrocarbon seep La Elina, Neuquén Basin, Argentina
- Autorzy:
-
Parent, Horacio
Kaim, Andrzej
Garrido, Alberto C. - Powiązania:
- https://bibliotekanauki.pl/articles/27311289.pdf
- Data publikacji:
- 2023
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Tematy:
-
Neuquén Basin
hydrocarbon seep
ammonites
Early Jurassic
Toarcian - Opis:
- The ancient hydrocarbon seep deposits at the La Elina Ranch, Neuquén Basin, northern Patagonia, Argentina, are the only Mesozoic seep site in South America yielding metazoan fossils. Apart from benthic mollusc shells and worm tubes, they yielded a number of nektonic ammonoids. Four species of ammonoids were identified: Hildaitoides retrocostatus, Hammatoceras ex gr. insigne, Calliphylloceras cf. nilssoni, and Phylloceras sp. The occurrences of three species (H. ex gr. insigne, C. cf. nilssoni, and Phylloceras sp.) probably are fortuitous, while H. retrocostatus might have actually thrived in, or around the seep, as indicated by numerous well-preserved juveniles, in addition to some adult specimens. The bathymetric estimates indicate a depth not greater than 200 m, while the benthic molluscs, typical of hydrocarbon seeps, indicate a much greater depth. It is hypothesized that the deep-water taxa might have occurred in a shallower setting, owing to rising anoxia and/or strong input of continental waters from the eastern and/or southeastern deltaic system. The ammonite assemblage indicates that the seep at La Elina is (Andean) Middle Toarcian, probably Chilensis Zone, in age.
- Źródło:
-
Annales Societatis Geologorum Poloniae; 2023, 93, 4; 353--361
0208-9068 - Pojawia się w:
- Annales Societatis Geologorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł