Microfacies and sedimentary environment of Paleocene-Eocene carbonate sequence at Kalateh–Shir and Kafaz sections, southeast Birjand, east of Iran

رخساره‌های رسوبی

Article 2, Volume 4, Issue 2, June 2011, Pages 173-187   

Document Type: مقالات پژوهشی

DOI: 10.22067/sed.facies.v4i2.9770

Authors

Gholam-Reza Mirab Shabestari^* ; Narges Shokuhi Moghaddam; Ahmad Reza Khazaei

Abstract

The studied area is located in southeast of Birjand, east Iran, where sedimentation has been continued throughout the Paleocene-Eocene period. In this research, two stratigraphic sections have been measured: the Kalateh-shir section which is located about 160 Km southeast of Birjand with about 257 m thickness. This section is mainly composed of thin to thick bedded limestone, dolomite, shale and conglomerate with an andesite unit. The second one is located in Kafaz village about 150 Km southeast of Birjand with about 160 m thickness, consists of thin to thick bedded limestone, dolomite, shale, sandstone and marl. Based on the field and laboratory studies, ten different microfacies have been recognized that are deposited in four facies belts, including: tidal flat, lagoon, shoal and open marine. Facies analyses indicated that the studied sequences have formed in a shallow carbonate ramp environment. Relative sea level changes represent a deepening-upward cycle that shows deposition during a progressive depositional system.

Keywords

Paleocene-Eocene; Birjand; East of Iran; microfacies; Carbonate ramp