An Emsian-Eifelian Calciturbidite sequence and the possible correlatable pattern of the Basal Choteč event in Western Ossa-Morena Zone, Portugal (Odivelas Limestone)

0345507 - GLÚ 2011 RIV BE eng J - Journal Article
Machado, G. - Hladil, Jindřich - Slavík, Ladislav - Koptíková, Leona - Moreira, N. - Fonseca, M. - Fonseca, P.
An Emsian-Eifelian Calciturbidite sequence and the possible correlatable pattern of the Basal Choteč event in Western Ossa-Morena Zone, Portugal (Odivelas Limestone).
GEOLOGICA BELGICA. Roč. 13, č. 4 (2010), s. 431-446. ISSN 1374-8505. E-ISSN 2034-1954
R&D Projects: GA ČR GA205/08/0767; GA AV ČR IAAX00130702; GA AV ČR KJB307020602
Grant - others:Fundacao para a Ciencia e a Tecnologia(PT) SFRH/BD/23787/2005
Institutional research plan: CEZ:AV0Z30130516
Keywords : stratigraphy * sedimentology * magnetic susceptibility * Emsian-Eifelian boundary * Basal Choteč Event * Odivelas Limestone * SW Ossa-Morena Zone
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 0.645, year: 2010
http://popups.ulg.ac.be/Geol/docannexe.php?id=3133

An Emsian-Eifelian carbonate-volcaniclastic sequence in south-western Ossa-Morena Zone (Portugal) was studied in terms of reef fauna, conodont biostratigraphy, macro- and micro-facies and magnetic susceptibility stratigraphy. The results point to a bracketing between the Po. patulus and T. australis conodont biozones (uppermost Emsian – middle-late Eifelian). The field data, facies analysis and reef fauna indicate that the sequence is composed entirely of calciturbidite and debris-flow deposits (intercalated with hemipelagic tuffites) related to a (up-slope) reefal system resting on top of volcanic buildings within a large volcanic complex. The purity of the limestones does not seem to be generally influenced by volcanic contributions. Although with some uncertainties, the first part of the section seems to show pre-, syn- and post-Basal Choteč Event (BCE) beds as recorded by significant shifts in lithofacies and magnetic susceptibility signal.
Permanent Link: http://hdl.handle.net/11104/0186764