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]

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Goncalves, PA (Author) Other; Mendonca Filho, JG (Author) Other; Mendonca, JO (Author) Other; Flores, D (Author) FCUP

Journal

Title: Comunicações Geológicas

Vol. 101

Pages: 439-442

ISSN: 0873-948X

Publisher: LNEG - Laboratório Nacional de Energia e Geologia

Indexing

ISI Web of Knowledge

Scopus - 2 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific