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Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Osburn, Magdalena and Grotzinger, John and Bergmann, Kristin (2014) Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman. AAPG Bulletin, 98 (8). pp. 1631-1667. ISSN 0149-1423. doi:10.1306/07291312140.

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The Khufai Formation is the oldest carbonate platform of the Cryogenian to lowermost Cambrian Huqf Supergroup. A stratigraphic characterization of this unit includes detailed facies descriptions, a sequence-stratigraphic interpretation, and evaluation of lateral heterogeneity and overall ramp evolution. The Khufai Formation comprises one and one-half depositional sequences with a maximum flooding interval near the base of the formation and a sequence boundary within the upper peritidal facies. Most of the deposition occurred during highstand progradation of a carbonate ramp. Facies tracts include outer-ramp and midramp mudstones and wackestones, ramp-crest grainstone shoal deposits, and extensive inner-ramp, microbially dominated peritidal deposits. Outcrops in the Oman Mountains are deep-water deposits, including turbiditic grainstone and wackestone interbedded with siliciclastic-rich siltstone and crinkly laminite. Facies patterns and parasequence composition are variable both laterally across the outcrop area and vertically through time because of a combination of ramp morphology, siliciclastic supply, and possible syndepositional faulting. The lithostratigraphic boundary between the Khufai Formation and the overlying Shuram Formation is gradational and represents significant flooding of the carbonate platform. The stratigraphic characterization presented here along with the identification of key facies and diagenetic features will help further future exploration and production of hydrocarbons from the Khufai Formation.

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URLURL TypeDescription DOIArticle
Osburn, Magdalena0000-0001-9180-559X
Grotzinger, John0000-0001-9324-1257
Additional Information:© 2014 The American Association of Petroleum Geologists. Manuscript received January 30, 2013; provisional acceptance November 27, 2012; revised manuscript received January 31, 2013; final acceptance July 29, 2013. We thank William Wilks, Gordon Forbes, Gideon Lopes-Cardozo, Joachim Amthor, and other Petroleum Development Oman personnel for helpful discussions; Salim Al Maskery for field support and logistics; the participants of the 2009 Agouron Advanced Field Course for initial stratigraphic observation; the Ministry of Oil and Gas, Sultanate of Oman, for permission to conduct and publish this research; and Michael Pope, Erwin Adams, and Stephan Schroder for helpful and constructive reviews. The AAPG Editor thanks the following reviewers for their work on this paper: Erwin W. Adams, Michael Pope, and Stefan Schroeder.
Issue or Number:8
Record Number:CaltechAUTHORS:20140911-083259093
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Official Citation:Magdalena Osburn, John Grotzinger, and Kristin Bergmann Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman AAPG Bulletin, August 2014, v. 98, p. 1631-1667, doi:10.1306/07291312140
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49572
Deposited By: Tony Diaz
Deposited On:11 Sep 2014 16:17
Last Modified:10 Nov 2021 18:45

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