TITLE:
Petrography, Sedimentary Environments and Sequence Stratigraphy of Asmari Formation in Central Fars, Zagros, SW (Iran)
AUTHORS:
Reza Mirzaee Mahmoodabadi
KEYWORDS:
Petrography, Sedimentary Environment, Sequence Stratigraphy, Asmari Formation, Zagros, Iran
JOURNAL NAME:
Open Journal of Geology,
Vol.4 No.12,
December
31,
2014
ABSTRACT: To study petrography,
microfacies, sedimentary environments and sequence stratigraphy of Asmari
formation in central Fars, 4 stratigraphic sections have benn chosen and
studied (Estahban, Shams-Abad, Sarvestan and Akbar-Abad Sections). Field and
laboratories study recognized 16carbonate
microfacies and 2 clastic-carbanate facies. Study of microfacies, relative sea
levelchange and sequence
stratigraphy evidences show these microfacies are deposited in carbonate ramp
sedimentary environment in 5 facies belt zones: Open marine (A), Restricted
(B), Shoal (C), Lagoon (D) and Tidal flat (E) during Oligomiocene. Petrography,
microfacies analysis and sedimentary environment of Asmari formation shows this
formation in study area consist of 3 depositional sequences. Lower sequence
boundary of DS1 with Jahrum formation is erosional (disconformity) SB1. Lower
and upper sequence boundary of DS2 is SB2. The upper sequence boundary of DS3
is SB1 and ended under the Razak clastic formation. In central Fars only lower
part of Asmari is deposited and upper part of this formation have been eroded
and disappeared.