Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

New Evidence on the Lithostratigraphy of the Jurassic System in the Northern Tabas Block, East-Central Iran

Document Type : Original Research Paper

Authors
Kazem Seyed -Emami 1
Franz Theodor Fursich 2
Markus Wilmsen 2
1 School of Mining Engineering,, College of Engineering, University of Tehran, Tehran, Iran
2 Paleontological Department, University of Wuerzburg, Germany
Abstract
The sedimentary pattern of the northern Tabas Block during the Jurassic period, apart from global sea-level fluctuations, was mainly governed by tectonic events of varying intensity and extent. These events took place during the Late Triassic (Early Cimmerian phase), Middle Bajocian (Mid-Cimmerian phase), Early Callovian, Late Oxfordian and Late Kimmeridgian/ Tithonian (Late Cimmerian phase). The importance and extent of these events and their influence on the facies pattern of the northern Tabas block are discussed. In this context the lithostratigraphy of the Jurassic strata in the northern Tabas Block is revised.
The stratigraphic position of the Badamu and Parvadeh formations is briefly discussed and three facies types of the Hojedk Formation, belonging to different sedimentary environments, are reported. The Middle and Upper Jurassic Magu Group is subdivided into three new and genetically related subgroups, i.e. the Upper Bajocian to Middle Callovian Baghamshah Subgroup, the Lower Callovian to Middle Kimmeridgian Esfandiar Subgroup and the Upper Kimmeridgian to Tithonian  Garedu Subgroup ( Fig. 3). Furthermore the Qal’ eh Dokhtar Formation is revised and three new formations, i.e. the Sikhor Formation (Lower/Middle Callovian), Kamar-e-Mehdi Formation (Callovian to Lower Kimmeridgian) and the Korond Formation (Upper Oxfordian to Middle Kimmeridgian) are established. This new subdivision will considerably facilitate the applicability of the lithostratigraphic scheme to future work.
 
Keywords
Central Iran
Tabas Block
Shotori Range
Jurassic System
Stratigraphy
Paleontology

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 15, Issue 57
Autumn 2006, Vol. 15, No. 57
Autumn 2006
Pages 78-97