The Shah Kuh Formation,a latest Barremian – Early Aptian carbonate platform of Central Iran (Khur area,Yazd Block) |
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| Institution: | 1. GFZ German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Evolution, Telegrafenberg, D-14473 Potsdam, Germany;2. Heidelberg University, Institute of Earth Sciences, Im Neuenheimer Feld 234, D-69120 Heidelberg, Germany;3. Senckenberg Research Institute and Natural History Museum, BIK-F, TSP6 Evolution and Climate, Senckenberganlage 25, D-60325 Frankfurt a.M., Germany;4. Department of Environmental Resources and Geohazards, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Warszawa, Poland;1. Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada;2. Biodiversity and Climate Research Centre (BIK-F), D-60325 Frankfurt am Main, Germany;3. Natural Resources Canada/Ressources Naturelles Canada, Geological Survey of Canada/Commission Géologique du Canada, 3303-33 St. NW, Calgary, AB T2L 2A7, Canada;4. Natural Resources Canada/Ressources naturelles Canada, Geological Survey of Canada/Commission Géologique du Canada, 1500-605 Robson Street, Vancouver, BC V6B 5J3, Canada;5. Department of Earth and Atmospheric Sciences, University of Nebraska — Lincoln, NB 68588-0340, USA;1. Department of Earth Sciences, ETH Zurich, Sonneggstrasse 5, 8092, Zurich, Switzerland;2. Department of Earth Sciences, Durham University, Science Labs, Durham DH13LE, United Kingdom |
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| Abstract: | The Shah Kuh Formation of the Khur area (Central Iran) consists of predominantly micritic, thick-bedded shallow-water carbonates, which are rich in orbitolinid foraminifera and rudists. It represents a late(est) Barremian – Early Aptian carbonate platform and overlies Upper Jurassic – Barremian continental and marginal marine sediments (Chah Palang and Noqreh formations); it is overlain by basinal deposits of the Upper Aptian – Upper Albian Bazyab Formation. The lithofacies changes at both, the base and top of the Shah Kuh Formation are gradational, showing that the formation is part of an overall transgressive sedimentary megacycle, and that the formational boundaries are potentially diachronous on larger distances. Analyses of facies and stratal geometries suggest that the Shah Kuh carbonate system started as a narrow, high-energy shelf that developed into a large-scale, flat-topped rudist platform without marginal rim or steep slope. The Shah Kuh Platform is part of a large depositional system of epeiric shallow-water carbonates that characterized large parts of present-day Iran during Late Barremian – Aptian times (“Orbitolina limestones” of NW and Central Iran, the Alborz and the Koppeh Dagh). Their biofacies is very similar to contemporaneous deposits from the western Tethys and eastern Arabia, and they form an important, hitherto poorly known component of the Tethyan warm-water carbonate platform belt. |
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