Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal)

0367621 - GLÚ 2012 RIV PL eng J - Journal Article
Machado, G. - Franců, E. - Vavrdová, Milada - Flores, D. - Fonseca, P. E. - Rocha, F. - Gama Pereira, L. C. - Gomes, A. - Fonseca, M. - Chaminé, H. I.
Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal).
Geological Quarterly. Roč. 55, č. 2 (2011), s. 139-164. ISSN 1641-7291. E-ISSN 2082-5099.
[International Palynological Conference of the International Commission of the Paleozoic Microflora (CIMP). Warsaw-Kielce, 13.09.2010-19.09.2010]
Institutional research plan: CEZ:AV0Z30130516
Keywords : Mississippian * Late Devonian * Ossa-Morena Zone * Porto-Tomar shear zone * palynology * organic geochemistry * turbidite systems * provenance * phytoplankton
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 0.844, year: 2011
http://gq.pgi.gov.pl/gq/article/viewFile/7606/pdf_4

The Porto-Tomar shear zone in Ossa Morena, WPortugal contain several tectonostratigraphic units developed as highly deformed low-grade metasediments. The Albergaria-a-Velha unit yielded palynomorphs indicating the early Frasnian to the Serpukhovian age and pointing together with lithostratigraphic evidence to an origin in a distal marine environment. Turbiditic and basinal marine sedimentation prevailed. Detrital framework data indicated stable cratonic sediment source area composed of low grade metamorphic rocks. Palynofacies analysis and lithostratigraphical data show a gradual increase of terrestrial output. Organic petrology and geochemical data indicate that the Albergaria- a- Velha unit can be placed within the dry gas window in terms of hydrocarbon generation ranges.
Permanent Link: http://hdl.handle.net/11104/0202223