Triassic stratigraphy,facies and evolution of the Arabian shelf in the northern United Arab Emirates |
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Authors: | Florian Maurer Roberto Rettori Rossana Martini |
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Institution: | 1.The Petroleum Institute,Abu Dhabi,United Arab Emirates;2.Dipartimento di Scienze della Terra,Università di Perugia,Perugia,Italy;3.Département de Géologie et Paléontologie,Université de Genève,Geneve,Switzerland |
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Abstract: | This study provides a reconstruction of the Late Permian and Triassic depositional history of the Arabian shelf in the northern
United Arab Emirates based on facies analysis and foraminiferal biostratigraphy. The presented data show that sedimentation
occurred in three major sequences. From the Late Permian to Olenekian carbonates and evaporites were deposited in restricted
lagoons and tidal flats. After a hiatus, sedimentation resumed and continued until the Late Ladinian/Carnian, leading to the
deposition of a carbonate platform dominated by peritidal dolostones. A period of shelf exposure and erosion, spanning from
the Carnian to Norian, was followed by the third major sequence with sedimentation into the Early Jurassic. During this third
depositional sequence sedimentation changed from pure carbonate into mixed carbonate–siliciclastic deposits. This transition
reflects the global regression of the sea in the Late Triassic (Triasina hantkeni Zone) and the increased erosion of large parts of the Arabian hinterland. A comparison of the evolution of the Arabian shelf
in the study area with chronostratigraphic reference schemes for the Arabian Plate reveals remarkable differences in the distribution
of Middle and Upper Triassic sequences. These are most likely the result of poor biostratigraphic control on previously studied
formations in the region. |
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Keywords: | Triassic Stratigraphy Facies Foraminifera Arabian Plate Carbonates |
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