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Palaeogeographical and palaeoclimatic evolution of the intracratonic Parnaíba Basin, NE Brazil using GPlates plate tectonic reconstructions and chemostratigraphic tools

By
Marwan M. Jaju
Marwan M. Jaju
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK
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Haydon P. Mort
Haydon P. Mort
Universidade Federal de Pernambuco, 1235-Cidade, 50670-901, Recife, Brazil
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Fadi H. Nader
Fadi H. Nader
Geosciences Division, IFP Energie Nouvelles, 1 & 4, avenue Préau, 92852-Cedex, France
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Mário L. Filho
Mário L. Filho
Universidade Federal de Pernambuco, 1235-Cidade, 50670-901, Recife, Brazil
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David I. M. Macdonald
David I. M. Macdonald
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK
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Published:
January 01, 2018

Abstract

The intracratonic Paleozoic Parnaíba Basin, NE Brazil covers c. 600 000 km2. Lithostratigraphic, mineralogical and geochemical approaches were used to deduce the changing environments of deposition of the Parnaíba Basin based on 150, mostly argillite, samples (Silurian–earliest Triassic). The results indicate that brackish conditions and mixed kerogen sources were important and that the palaeowater depth and sources of meteoric water varied from west to east. The chemical index of alteration results, together with other elemental and mineralogical data, indicate that the western margin was humid until the end of the Carboniferous and then became arid, whereas the eastern margin showed the reverse pattern. This supports observations of major stratigraphic differences between the two margins. There were also major variations in the palaeoredox and palaeosalinity conditions (oxic and fresh to brackish water systems in the east v. suboxic to dysoxic and saline water systems in the west). The clay mineral assemblages are characteristically dominated by kaolinite, which is considered to be inherited from weathering horizons developed in silicic granitic terranes. Regional palaeoclimate reconstructions were carried out in the Parnaíba Basin by linking GPlates software with the South America plate motion model (northwards drift during the Paleozoic coupled with a latest Paleozoic rotation phase) and with the regional database of information on the location, formation name and original references for each locality.

Supplementary material: Chemical composition data and geographical coordinates from the 177 outcrops investigated as part of this study: a detailed description of the geochemical and mineralogical analyses with calculation of the CIA value and the GPlates Markup Language File (Animation 1). Supplementary material available online at https://doi.org/10.6084/m9.figshare.c.4100348

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Contents

Cratonic Basin Formation: A Case Study of the Parnaíba Basin of Brazil
CONTAINS OPEN ACCESS

M. C. Daly
M. C. Daly
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R. A. Fuck
R. A. Fuck
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J. Julià
J. Julià
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D.I.M. MacDonald
D.I.M. MacDonald
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A. B. Watts
A. B. Watts
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Geological Society of London
Volume
472
ISBN electronic:
9781786204127
Publication date:
January 01, 2018

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