Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal)

Miguel Telles Antunes, Paulo Alexandre Rodrigues Roque Legoinha, S. Sen

Research output: Contribution to journal › Article

Abstract

The magnetostratigraphy of two sections in early Miocene marine deposits of the Tagus Basin is studied. Thermal demagnetization was used to isolate the primary component of magnetization for 45 samples from the Foz da Fonte section, and for 74 others from Trafaria section. The succession of the polarity zones found in these sections is tentatively correlated with the geomagnetic polarity time scale (GPTS) on the basis of the biostratigraphic data yielded by planktic Foraminifera. The planktic zones and magnetic polarities recognized in these sections can be adequately correlated with the part of the GPTS [table calibrated by BERG!JREN et al. (1985)] corresponding to the Anomalies 6 and 5E (Foz da Fonte) and 5D (Trafaria). This correlations suggests ages between 19,35 and 18,14 Ma for Foz da Fonte section, and 17,90 to 16,98 Ma for Trafaria.
Original languageEnglish
JournalCiências da Terra (UNL)
Publication statusPublished - 1992

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magnetostratigraphy
Miocene
timescale
demagnetization
magnetization
basin
foraminifera
anomaly

Keywords

  • Tagus Basin
  • Portugal
  • Magnetostratigraphy
  • Lower Miocene
  • Foraminifera
  • Lisboa

Cite this

Antunes, Miguel Telles ; Legoinha, Paulo Alexandre Rodrigues Roque ; Sen, S. / Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal). In: Ciências da Terra (UNL). 1992.
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Antunes, MT, Legoinha, PARR & Sen, S 1992, 'Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal)' Ciências da Terra (UNL).

Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal). / Antunes, Miguel Telles; Legoinha, Paulo Alexandre Rodrigues Roque; Sen, S.

In: Ciências da Terra (UNL), 1992.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal)

AU - Antunes, Miguel Telles

AU - Legoinha, Paulo Alexandre Rodrigues Roque

AU - Sen, S.

PY - 1992

Y1 - 1992

N2 - The magnetostratigraphy of two sections in early Miocene marine deposits of the Tagus Basin is studied. Thermal demagnetization was used to isolate the primary component of magnetization for 45 samples from the Foz da Fonte section, and for 74 others from Trafaria section. The succession of the polarity zones found in these sections is tentatively correlated with the geomagnetic polarity time scale (GPTS) on the basis of the biostratigraphic data yielded by planktic Foraminifera. The planktic zones and magnetic polarities recognized in these sections can be adequately correlated with the part of the GPTS [table calibrated by BERG!JREN et al. (1985)] corresponding to the Anomalies 6 and 5E (Foz da Fonte) and 5D (Trafaria). This correlations suggests ages between 19,35 and 18,14 Ma for Foz da Fonte section, and 17,90 to 16,98 Ma for Trafaria.

AB - The magnetostratigraphy of two sections in early Miocene marine deposits of the Tagus Basin is studied. Thermal demagnetization was used to isolate the primary component of magnetization for 45 samples from the Foz da Fonte section, and for 74 others from Trafaria section. The succession of the polarity zones found in these sections is tentatively correlated with the geomagnetic polarity time scale (GPTS) on the basis of the biostratigraphic data yielded by planktic Foraminifera. The planktic zones and magnetic polarities recognized in these sections can be adequately correlated with the part of the GPTS [table calibrated by BERG!JREN et al. (1985)] corresponding to the Anomalies 6 and 5E (Foz da Fonte) and 5D (Trafaria). This correlations suggests ages between 19,35 and 18,14 Ma for Foz da Fonte section, and 17,90 to 16,98 Ma for Trafaria.

KW - Tagus Basin

KW - Portugal

KW - Magnetostratigraphy

KW - Lower Miocene

KW - Foraminifera

KW - Lisboa

UR - https://run.unl.pt/bitstream/10362/4510/1/CT_11_12.pdf

M3 - Article

JO - Ciências da Terra (UNL)

JF - Ciências da Terra (UNL)

ER -

Antunes MT, Legoinha PARR, Sen S. Bio and magnetostratigraphy of two Lower Miocene sections, Tagus basin (Portugal). Ciências da Terra (UNL). 1992.

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