Palaeogeographical and palaeoclimatic evolution of the intracratonic Parnaíba Basin, NE Brazil using GPlates plate tectonic reconstructions and chemostratigraphic tools
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Posted on 2018-06-05 - 08:47
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.
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Jaju, Marwan M.; P. Mort, Haydon; Nader, Fadi H.; Filho, Mário L.; Macdonald, David I.M. (2018). Palaeogeographical and palaeoclimatic evolution of the intracratonic Parnaíba Basin, NE Brazil using GPlates plate tectonic reconstructions and chemostratigraphic tools. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4100348.v5
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AUTHORS (5)
MJ
Marwan M. Jaju
HP
Haydon P. Mort
FN
Fadi H. Nader
MF
Mário L. Filho
DM
David I.M. Macdonald
CATEGORIES
KEYWORDS
sourcesilicic granitic terranes600 000 km 2intracratonic Paleozoic Parna íba BasinPaleozoic rotation phasesaline water systemsParna íba BasinwestRegional palaeoclimate reconstructionsintracratonic Parna íba BasinGPlates plate tectonic reconstructionsNE BrazilSouth America plate motion modelclay mineral assemblagesGeology