Basin architecture and growth folding of the NW Zagros early foreland basin during the Late Cretaceous and early Tertiary
Eduard Saura
Jaume Vergés
Stéphane Homke
Eric Blanc
Josep Serra-Kiel
Gilen Bernaola
Emilio Casciello
Naiara Fernández
Indiana Romaire
Giulio Casini
Jean Christophe Embry
Ian R. Sharp
David W. Hunt
10.6084/m9.figshare.3454925.v1
https://geolsoc.figshare.com/articles/dataset/Basin_architecture_and_growth_folding_of_the_NW_Zagros_early_foreland_basin_during_the_Late_Cretaceous_and_early_Tertiary/3454925
<p>We present and use the chronostratigraphy of 13 field logs and detailed mapping to constrain the evolution of the early Zagros
foreland basin, in NW Iran. Large foraminifera, calcareous nannofossil, palynological and <sup>87</sup>Sr/<sup>86</sup>Sr analysis supplied ages indicating a Campanian–early Eocene age of the basin infill, which is characterizd by a diachronous,
southwestward migrating, shallowing upwards, mixed clastic–carbonate succession. Growth synclines and local palaeoslope variations
indicate syndepositional folding from Maastrichtian to Eocene time and suggest forelandward migration of the deformation front.
We also illustrate the basin architecture with a synthetic stratigraphic transect. From internal to external areas, time lines
cross the formation boundaries from continental Kashkan red beds to Taleh Zang mixed clastic–carbonate platforms, Amiran slope
deposits and basinal Gurpi–Pabdeh shales and marls. The foreland basin depocentres show a progressive migration from the Campanian
to Eocene (<em>c</em>. 83–52.7 Ma), with rates of <em>c</em>. 2.4 mm a<sup>−1</sup> during the early–middle Palaeocene (<em>c</em>. 65.5–58.7 Ma) increasing to <em>c</em>. 6 mm a<sup>−1</sup> during the late Palaeocene–earliest Eocene (<em>c</em>. 58.7–52.8 Ma). Coeval subsidence remained at <em>c</em>. 0.27 mm a<sup>−1</sup> during the first 12.7 Ma and decreased to <em>c</em>. 0.16 mm a<sup>−1</sup> during the last 4.2 Ma of basin filling. Finally, we integrate our results with published large-scale maps and discuss their
implications in the context of the Zagros orogeny.
</p>
2016-06-21 12:26:54
Amiran slope deposits
Ma
13 field logs
NW
Zagros foreland basin
mm
Eocene
foreland basin depocentres show
basin architecture
Geology