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The tectonic evolution of pre-Permian rocks, Central and Southeastern Oman Mountains

A. Mann and S. S. Hanna
Geological Society, London, Special Publications, 49, 307-325, 1 January 1990, https://doi.org/10.1144/GSL.SP.1992.049.01.19
A. Mann
1Robertson Group plc Llandudro, Gwynedd LL30 ISA, UK
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S. S. Hanna
2Department of Earth Sciences, Sultan Qaboos University P.O. Box 32486, Sultanate of Oman
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Abstract

The structural history of pre-Permian basement rocks exposed in the domal uplifts of Jebel Akhdar, Jebel Nakhl and Saih Hatat, central and southeastern Oman mountains, is dominated by Late Palaeozoic and Late Cretaceous deformation and metamorphism. In Jebel Akhdar pre-Permian rocks have been deformed by large NE-SW trending thrusts and folds and intense cleavage during Late Palaeozoic compression. Later reactivation of these structures accompanied by a major flattening deformation caused by loading may be related to thrusting and folding in the overlying Permian to Cenomanian platform carbonates. These structures are ascribed partly to Late Cretaceous deformation. The complex internal structure of Saih Hatat is attributed to overprinting of possible Proterozoroic and Late Palaeozoic tectonic events by Late Cretaceous thrusting, folding and associated blueschist metamorphism. The identification of a major basement-cover duplex involving pre-Permian rocks and platform carbonates in Saih Hatat suggests that the pre-Permian basement and platform carbonates did not remain as autochthonous units during Late Cretaceous deformation. Instead, both basement and cover have been thrust southwards during emplacement of the Tethyan thrust sheets onto the Arabian continental margin. Sedimentological evidence from the Tertiary sequence reinforces the development of the Saih Hatat dome as a Late Cretaceous culmination above a deep seated thrust which may have been rejuvenated during the Tertiary. In Jebels Akhdar and Nakhl there is no evidence of a basement-cover duplex. Nevertheless, reactivation of pre-Permian structures and imbrication of cover rocks (Mesozoic platform carbonates) in Jebel Akhdar has important implications to the timing of its structural growth. An alternative model of under-thrusting of the N Arabian margin beneath a subduction trench is also proposed to explain the formation and subsequent elevation of the Oman blueschists.

  • © The Geological Society 1990

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Geological Society, London, Special Publications: 49 (1)
Geological Society, London, Special Publications
Volume 49
1990
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The tectonic evolution of pre-Permian rocks, Central and Southeastern Oman Mountains

A. Mann and S. S. Hanna
Geological Society, London, Special Publications, 49, 307-325, 1 January 1990, https://doi.org/10.1144/GSL.SP.1992.049.01.19
A. Mann
1Robertson Group plc Llandudro, Gwynedd LL30 ISA, UK
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S. S. Hanna
2Department of Earth Sciences, Sultan Qaboos University P.O. Box 32486, Sultanate of Oman
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The tectonic evolution of pre-Permian rocks, Central and Southeastern Oman Mountains

A. Mann and S. S. Hanna
Geological Society, London, Special Publications, 49, 307-325, 1 January 1990, https://doi.org/10.1144/GSL.SP.1992.049.01.19
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