Abstract
Permian rocks in east-central Iran (Posht-e-Badam and Tabas blocks) belong to well-defined sequences in juxtaposed Early and Late Permian biogeographic provinces. The Lower Permian Khan Formation in the Kalmard area (Within the Posht-e- Badam block) is composed of cyclic sequences of thick compositionally and texturally mature sandstones and thin carbonates. The sequences reflect several nearshore microfacies,which constitute threemajor paleoenvironmental associations: tidal flat, lagoon, and shoal (openmarine microfacies are missing or very rare). The carbonate rocks of the Lower through Upper Permian Jamal Formation in the Shotori and Shirgesht areas (within the Tabas block) are comprised of four microfacies indicative of tidal flat, lagoon, foreshore and open marine paleoenvironments. The Jamal Formationwas deposited on a homoclinal carbonate ramp,which deepens to the north (Bagh-e-Vang section) and thins in southern locations (near the Jamal Formation type section). The Khan Formation succession is composed of secondand third-order cyclically siliciclastic and carbonate sequences. The Jamal carbonate is composed of second- and third-order shallowing-upward sequences. Both local tectonic activity and global eustacy may have controlled the cyclicity of the Khan and Jamal formations.
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