Biostratigraphy and lithostratigraphy evidence of the Pyrenees Orogeny in the Zagros basin, Case study: Baba Habib and Sultan Anticlines, Lurestan Basin

Articles in Press

Document Type : Research Paper

Authors

1 Ph.D. student of Sedimentology and Petrology of Sedimentary Rocks, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran

2 Professor, Department of Petroleum and Sedimentary Basins, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran

3 department of basins and petroleum, faculty of Earth sciences, Shahid Beheshti university , Tehran, Iran

Abstract

This research aims to report the available unconformity of the Late-Alpine Orogenic Phases at the boundary between the Shahbazan-Asmari formations in two sections i.e., the Babahabib and Sultan anticlines located in the Lorestan Basin. Shahbazan and the Asmari formations belonged to the Late- and Early-Miocene.The first transgression occurred during the Miocene. The occurrence and effects of the final Alpine Orogenic Phases, especially the Pyrenean Orogenic Phase in the Zagros depositional Basin, result in the absence of deposits or the gap during this interval. In this research, the base of the Asmari Formation overlain the Shahbazan Formation with an erosional disconformity. The Orogenic activities of the late Eocene regression and then outcrop (in the result of the Pyrenean Orogenic Phase) have caused the erosion, outcrop, and meteoric diagenesis in the upper part of the Shahbazan Formation. In this study, some evidence of disconformity at the boundary between Asmari and Shahbazan formations will be reported based on paleomicrokarst evidence in the Zagros Basin. The presence of limestones, the expansion of karst, and the availability of red paleosols in the study intervals all indicate the heavy rainfall conditions during the late Eocene in the Lorestan Basin. Based on the studies and the conditions of microkarst formation, it can be inferred that this part of the Arabian Plate was affected by the phases of Orogeny of the Late Alpine in the Late Eocene. Also, according to the amount of rainfall, the study area was located near the equator latitude.

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Journal of Stratigraphy and Sedimentology Researches

Articles in Press, Accepted Manuscript
Available Online from 12 October 2024

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