محيط رسوبي بخش بالايي سازند آسماري (بورديگالين) بر اساس ريز رخساره ها و پالئواكولوژي روزنه داران، در جنوب شرقي كوه لكي، جنوب لردگان

Depositional Environment of the Upper Pun of Asmari Formation (Burdigalian) Based on Mierofacies, and Paleoecology of Foraminifera, Southeast of the Laki Mountain, Southern Lordegan

The upper Asmari Formation in southeast Laki Mountain comprises of 376 meters of thin, medium and thick beds of limestone interbedding with marly limestone. It is overlies by the Gachsaran formation. Based on field work and laboratory analysis, 13 microfacies related to basin (outer ramp), open marine (middle ramp), bar and lagoon (inner ramp) environments were recognized, as follows: Planktonic foraminifera mudstone-wackestone, Bioclast planktonic foraminifera wackestone-packstone, Planktonic foraminifera Heterostegina packstone, Bioclast Miogypsinid corallinacea packstone, Coral and corallinacea floatstone, Rotalia wackestone-packstone, Rotalia miliolid wackestone-packstone, Foraminifera (Rotalia, Meandropsina, Borelis, Archaias, Peneroplis) miliolid packstone-grainstone, Bioclast corallinacea miliolid packstone, Miliolid grainstone, Intraclast bioclast packstone, Bioclast wackestone-packstone and quartz mudstone. Paleoenvironment reconstruction based on the occurrence of foraminifera, related to microfacies and environmental factors (light, depth and water energy) reflects that deposition of the Upper Asmari Formation (Burdigalian) was in a carbonate ramp platform.