The presence of zooclasts and zoomorphs in the carbonate candeeiros formation (Arruda sub-basin, lusitanian basin, portugal): Paleoenvironmental evidence [Presença de zooclastos e zoomorfos na formação de Candeeiros (Sub-bacia de Arruda, Bacia Lusitânica, Portugal): Evidências paleoambientais]

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Goncalves, PA (Autor) Outra; Mendonca Filho, JG (Autor) Outra; Mendonca, JO (Autor) Outra; Flores, D (Autor) FCUP

Revista

Título: Comunicações Geológicas

Vol. 101

Páginas: 439-442

ISSN: 0873-948X

Editora: LNEG - Laboratório Nacional de Energia e Geologia

Indexação

ISI Web of Knowledge

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00G-51W

Abstract (EN): Zooclasts correspond to animal-derived organic particles such as crustacean eggs, tintinnids, insect cuticles fragments and other arthropods fragments. Zoomorph subgroup is composed by animal-derived palynomorphs including foraminiferal linings, chitinozoa and scolecodonts. Due to their characteristics, it is very rare to find these organic particles in the kerogen assemblage of ancient marine sediments. The Candeeiros formation (informal unit), corresponds to sediments of the inner part of a carbonate ramp developed in the Middle Jurassic, showed in some layers the presence of degraded remains of particulate organic matter classified as zooclasts and foraminiferal test-linings (zoomorphs). The fact that such amounts of zooclasts and zoomorphs were preserved is indicative of high zooplankton productivity and consequently high primary productivity. To allow the survival of these organisms the water column must be oxygen rich. Despite the high primary productivity, the accumulation and preservation of the organic matter in the sediments was weak as evidenced by the lower total organic carbon content (less than 0.16wt.%). © 2014 LNEG ¿ Laboratório Nacional de Geologia e Energia IP.

Idioma: Inglês

Tipo (Avaliação Docente): Científica