Ichnological analysisa useful tool to approach eco-sedimentary parameters in deep-sea environments
- Francisco J. Rodríguez-Tovar 1
- Alfred Uchman 2
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1
Universidad de Granada
info
- 2 Jagiellonian University, Institute of Geological Sciences
ISSN: 1576-5172
Argitalpen urtea: 2010
Zenbakien izenburua: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010
Zenbakia: 11
Orrialdeak: 149-150
Mota: Artikulua
Beste argitalpen batzuk: Geotemas (Madrid)
Laburpena
Ichnological analysis through the Cenomanian-Turonian transition from deep-sea sediments, correspondingto the Oceanic Anoxic Event -2, reveals significant changes in abundance and diversity of trace fossils as well as inichnofabrics. Higher abundance and diversity of trace fossils in the pre- and post-OAE-2 intervals, accords with agenerally good oxygenation, but punctuated by short periods of anoxia (absence of trace fossils and bioturbationalstructures) or dysaerobic conditions (one ichnotaxon, some bioturbational structures). The analysis shows that theOAE-2 interval is not a single event, but it is composed of several short-term anoxic events interrupted by shorterdysaerobic and oxic events favouring an ephemeral colonization. Variations in ichnological features reveal as veryuseful to recognize oxygenation changes in deep-water environments as those related to deep-bottom currentcirculation.