Biostratigraphy and the first zoning of Late Triassic deposits in Central Iranian Microcontinent (Shahdad section in the south of Lut Block),
Document Type : Original Article
Authors
Department of Geology, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
Abstract
To study the biostratigraphy of the Late Triassic deposits in the central Iran microcontinent, Shahdad stratigraphic section located in the southern areas of the Lut Block was selected and sampled. The studied section is 340 meters in thickness and terms of lithology, it mostly includes shale, sandstone and interlayers of sandy limestone. Based on the identified benthic foraminifers, the number of 11 biozones includes:
Triasina hantkeni, Pilamminella falsofriedli, Concorence rang Zone
Trochammina almtalensis, Ophtalmidium exiguum, Agathammina oustroalpina Planiinvoluta regularis, Angulodiscus cummunis, Ammodiscus parapriscus,
Interval Zone Auloconus permodiscoides, Glomospirella minima, Tetrataxis inflata,
in the Upper Triassic deposits. Based on the identified biozones, the age range of the studied sequences is suggested as Late Norian to Late Rhaetian, which is equivalent to the Howz-e Khan and Qadir members of the Nayband Formation in Central Iran.
Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran
Triasina hantkeni, Pilamminella falsofriedli, Concorence rang Zone
Trochammina almtalensis, Ophtalmidium exiguum, Agathammina oustroalpina Planiinvoluta regularis, Angulodiscus cummunis, Ammodiscus parapriscus,
Interval Zone Auloconus permodiscoides, Glomospirella minima, Tetrataxis inflata,
in the Upper Triassic deposits. Based on the identified biozones, the age range of the studied sequences is suggested as Late Norian to Late Rhaetian, which is equivalent to the Howz-e Khan and Qadir members of the Nayband Formation in Central Iran.
Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran Central Iran
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