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Miocene lithological, foraminiferal and palynological data from the Belverde borehole (Portugal)
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Resumo(s)
Preliminary data on litho stratigraphy and biostratigraphy of the Belverde borehole (http://www. dct.Jct.unl.pt/
SondagemISondagem/colunalindex_col.html) is presented. The borehole attained 619,77 m of depth, crossing 130 m of Plio-Pleistocene and 460 m of Miocene dep osits. Main lithologies are fine sands , marl s and
biocalcarenites. A coral reef was recognized in the lower part of the borehole (530-585 m). Gamma ray, neutrons and sonic diagraphies were obtained. Eight 87Sr/86Sr isotopic ages (H. Elderfield, Cambridge University)and the presence of some of the main planktonic foraminifera markers were used to establish the chronostratigraphic framework. Plankt onic spikes are related to the major transgression s of the Lower Tagus
Basin (LTB): M. Burdigalian (sample Belv 459 ; 446 m), L. Serravallian (Belv 76; 244 m) and L. Tortonian
(Belv 51, 202 m). Benthi c assemblages are dominated by Ammonia, Elphidium and Nonion. Spores suggest a mild and humid climate during the uppermost Burdigalian to the Tortonian. Pollen is scarce. Thirty dinoflagellates taxa (26 Gonyaulacoids and 4 Peridinioids) have been identi fied, indicating coastal to shallow marine environments. In the uppermost Burdigalian to the Tortonian the presence of peridinioids and scarce acritarchs suggest
influence of inshore to brackish environments. Several 87Sr /86Sr ages obtained by H. Elderfield (Cambridge
University) fit well with the biostratigraphy for the Lower an Middle Miocene, but values given by Howarth
and Mcarthur (1997) are closer to the Upper Miocene bio stratigraphic data.
Descrição
XVIII Jornadas de Paleontología, 2002
Palavras-chave
Belverde borehole Lower Tagus basin Portugal, miocene Palynology 87Sr j86Sr ages
Contexto Educativo
Citação
Editora
Universidad de Salamanca