Facies changes and paleogeographical implications in the Serravallian of the Lagos-Portimão Formation (Praia da Rocha, southern Portugal)

João José Cardoso Pais; Paulo Alexandre Rodrigues Roque Legoinha

Facies changes and paleogeographical implications in the Serravallian of the Lagos-Portimão Formation (Praia da Rocha, southern Portugal)

João José Cardoso Pais, Paulo Alexandre Rodrigues Roque Legoinha

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Detailed stratigraphic control and lateral tracing of facies between Praia da Rocha and the adjacent Praia do Vau evidenced that, although the thickness of layers remains essentially homogeneous, the internal composition, grain size and fossil contents change noticeably. Three orders of sequences were distinguished. Smaller-scaled sequences were produced by storms (event beds). Second order sequences are interpreted as generated by a Milankovitch forcing. The larger scale one is observed by the piling of subunits, with assumed eustatic forcing. The prevailing W/SW orientation of paleocurrents measured, and the overall model of dispersion systems, fit in an estuarine pattern of circulation during the Middle Miocene in the North-Betic Strait. Local, gentle diapiric up-warping between Portimão and Albufeira also contributed to water-depth and facies changes.

Key words: Lagos-Portimão Formation, Serravallian, Algarve, Portugal.

Original language	Unknown
Title of host publication	Geo-temas
Pages	132-134
Publication status	Published - 1 Jan 2008
Event	VII Congreso Geológico de España, Las Palmas de Gran Canaria - Duration: 1 Jan 2008 → …

Conference

Conference	VII Congreso Geológico de España, Las Palmas de Gran Canaria
Period	1/01/08 → …

Cite this

@inproceedings{2c08348bd8284172aab8117b4d8fd975,

title = "Facies changes and paleogeographical implications in the Serravallian of the Lagos-Portim{\~a}o Formation (Praia da Rocha, southern Portugal)",

abstract = "Detailed stratigraphic control and lateral tracing of facies between Praia da Rocha and the adjacent Praia do Vau evidenced that, although the thickness of layers remains essentially homogeneous, the internal composition, grain size and fossil contents change noticeably. Three orders of sequences were distinguished. Smaller-scaled sequences were produced by storms (event beds). Second order sequences are interpreted as generated by a Milankovitch forcing. The larger scale one is observed by the piling of subunits, with assumed eustatic forcing. The prevailing W/SW orientation of paleocurrents measured, and the overall model of dispersion systems, fit in an estuarine pattern of circulation during the Middle Miocene in the North-Betic Strait. Local, gentle diapiric up-warping between Portim{\~a}o and Albufeira also contributed to water-depth and facies changes. Key words: Lagos-Portim{\~a}o Formation, Serravallian, Algarve, Portugal.",

author = "Pais, {Jo{\~a}o Jos{\'e} Cardoso} and Legoinha, {Paulo Alexandre Rodrigues Roque}",

year = "2008",

month = jan,

day = "1",

language = "Unknown",

pages = "132--134",

booktitle = "Geo-temas",

note = "VII Congreso Geol{\'o}gico de Espa{\~n}a, Las Palmas de Gran Canaria ; Conference date: 01-01-2008",

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TY - GEN

T1 - Facies changes and paleogeographical implications in the Serravallian of the Lagos-Portimão Formation (Praia da Rocha, southern Portugal)

AU - Pais, João José Cardoso

AU - Legoinha, Paulo Alexandre Rodrigues Roque

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Detailed stratigraphic control and lateral tracing of facies between Praia da Rocha and the adjacent Praia do Vau evidenced that, although the thickness of layers remains essentially homogeneous, the internal composition, grain size and fossil contents change noticeably. Three orders of sequences were distinguished. Smaller-scaled sequences were produced by storms (event beds). Second order sequences are interpreted as generated by a Milankovitch forcing. The larger scale one is observed by the piling of subunits, with assumed eustatic forcing. The prevailing W/SW orientation of paleocurrents measured, and the overall model of dispersion systems, fit in an estuarine pattern of circulation during the Middle Miocene in the North-Betic Strait. Local, gentle diapiric up-warping between Portimão and Albufeira also contributed to water-depth and facies changes. Key words: Lagos-Portimão Formation, Serravallian, Algarve, Portugal.

AB - Detailed stratigraphic control and lateral tracing of facies between Praia da Rocha and the adjacent Praia do Vau evidenced that, although the thickness of layers remains essentially homogeneous, the internal composition, grain size and fossil contents change noticeably. Three orders of sequences were distinguished. Smaller-scaled sequences were produced by storms (event beds). Second order sequences are interpreted as generated by a Milankovitch forcing. The larger scale one is observed by the piling of subunits, with assumed eustatic forcing. The prevailing W/SW orientation of paleocurrents measured, and the overall model of dispersion systems, fit in an estuarine pattern of circulation during the Middle Miocene in the North-Betic Strait. Local, gentle diapiric up-warping between Portimão and Albufeira also contributed to water-depth and facies changes. Key words: Lagos-Portimão Formation, Serravallian, Algarve, Portugal.

M3 - Conference contribution

SP - 132

EP - 134

BT - Geo-temas

T2 - VII Congreso Geológico de España, Las Palmas de Gran Canaria

Y2 - 1 January 2008

ER -