Geochemistry and mineralogy of the Lower Cretaceous of the Lusitanian Basin (western Portugal)

Deciphering palaeoclimates from weathering indices and integrated vegetational data

Pedro A. Dinis, Jorge L. Dinis, Mário Miguel Mendes, Jacques Rey, João Pais

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The present study investigates the climatic influence on the geochemistry and mineralogy of the Lower Cretaceous succession of the Ericeira region (Lusitanian Basin, western Portugal). Palaeoclimatic conditions are inferred from a combination of weathering indices and independent palynological and palaeobotanical data. A composite weathering intensity index is computed from selected geochemical and mineralogical data. The concentrations of some elements (Co, Ni, Sc, Th, V, Y, Zn, Zr) indicate variable contributions of sediments from the Lusitanian Basin margin and Iberian hinterland. It is demonstrated that the weathering intensity values are largely influenced by source area geology. The increases in weathering intensity following major unconformities (Late Barremian and Late Aptian) are partially attributed to the arrival of detritus from an evolved regolith sequence in the Iberian hinterland. A combined analysis of independent proxies is found necessary to conveniently discern the roles played by distinct processes on the weathering intensity and investigate the palaeoclimatic conditions.

Original languageEnglish
Pages (from-to)139-149
Number of pages11
JournalComptes Rendus - Geoscience
Volume348
Issue number2
DOIs
Publication statusPublished - 1 Feb 2016

Fingerprint

paleoclimate
mineralogy
weathering
geochemistry
Cretaceous
basin
Barremian
Aptian
regolith
unconformity
detritus
geology
index
sediment

Keywords

  • Fossil floras
  • Lower Cretaceous
  • Lusitanian Basin
  • Palaeoclimate
  • Weathering intensity

Cite this

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title = "Geochemistry and mineralogy of the Lower Cretaceous of the Lusitanian Basin (western Portugal): Deciphering palaeoclimates from weathering indices and integrated vegetational data",
abstract = "The present study investigates the climatic influence on the geochemistry and mineralogy of the Lower Cretaceous succession of the Ericeira region (Lusitanian Basin, western Portugal). Palaeoclimatic conditions are inferred from a combination of weathering indices and independent palynological and palaeobotanical data. A composite weathering intensity index is computed from selected geochemical and mineralogical data. The concentrations of some elements (Co, Ni, Sc, Th, V, Y, Zn, Zr) indicate variable contributions of sediments from the Lusitanian Basin margin and Iberian hinterland. It is demonstrated that the weathering intensity values are largely influenced by source area geology. The increases in weathering intensity following major unconformities (Late Barremian and Late Aptian) are partially attributed to the arrival of detritus from an evolved regolith sequence in the Iberian hinterland. A combined analysis of independent proxies is found necessary to conveniently discern the roles played by distinct processes on the weathering intensity and investigate the palaeoclimatic conditions.",
keywords = "Fossil floras, Lower Cretaceous, Lusitanian Basin, Palaeoclimate, Weathering intensity",
author = "Dinis, {Pedro A.} and Dinis, {Jorge L.} and Mendes, {M{\'a}rio Miguel} and Jacques Rey and Jo{\~a}o Pais",
note = "sem pdf conforme despacho. ANGIOGAL (PTDC/CTE-GIX/104999/2008) and Creta-Carbo (PTDC/CTE-GIX/113983/2009) projects. It was also supported by the FCT (Portuguese National Board of Scientific Research) through the MARE (Marine and Environmental Sciences Centre) (UID/MAR/04292/2013) Strategic Programme.",
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Geochemistry and mineralogy of the Lower Cretaceous of the Lusitanian Basin (western Portugal) : Deciphering palaeoclimates from weathering indices and integrated vegetational data. / Dinis, Pedro A.; Dinis, Jorge L.; Mendes, Mário Miguel; Rey, Jacques; Pais, João.

In: Comptes Rendus - Geoscience, Vol. 348, No. 2, 01.02.2016, p. 139-149.

Research output: Contribution to journalArticle

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AU - Dinis, Jorge L.

AU - Mendes, Mário Miguel

AU - Rey, Jacques

AU - Pais, João

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N2 - The present study investigates the climatic influence on the geochemistry and mineralogy of the Lower Cretaceous succession of the Ericeira region (Lusitanian Basin, western Portugal). Palaeoclimatic conditions are inferred from a combination of weathering indices and independent palynological and palaeobotanical data. A composite weathering intensity index is computed from selected geochemical and mineralogical data. The concentrations of some elements (Co, Ni, Sc, Th, V, Y, Zn, Zr) indicate variable contributions of sediments from the Lusitanian Basin margin and Iberian hinterland. It is demonstrated that the weathering intensity values are largely influenced by source area geology. The increases in weathering intensity following major unconformities (Late Barremian and Late Aptian) are partially attributed to the arrival of detritus from an evolved regolith sequence in the Iberian hinterland. A combined analysis of independent proxies is found necessary to conveniently discern the roles played by distinct processes on the weathering intensity and investigate the palaeoclimatic conditions.

AB - The present study investigates the climatic influence on the geochemistry and mineralogy of the Lower Cretaceous succession of the Ericeira region (Lusitanian Basin, western Portugal). Palaeoclimatic conditions are inferred from a combination of weathering indices and independent palynological and palaeobotanical data. A composite weathering intensity index is computed from selected geochemical and mineralogical data. The concentrations of some elements (Co, Ni, Sc, Th, V, Y, Zn, Zr) indicate variable contributions of sediments from the Lusitanian Basin margin and Iberian hinterland. It is demonstrated that the weathering intensity values are largely influenced by source area geology. The increases in weathering intensity following major unconformities (Late Barremian and Late Aptian) are partially attributed to the arrival of detritus from an evolved regolith sequence in the Iberian hinterland. A combined analysis of independent proxies is found necessary to conveniently discern the roles played by distinct processes on the weathering intensity and investigate the palaeoclimatic conditions.

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