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Ahead of Print Abstract
DOI:10.1306/03222423009
An integrated correlation from platform to basin: Implications for understanding the Ediacaran succession of Oman
Irene Gomez-Perez1* , Kristin Bergmann2 , and Hussam Al Rawahi1
1 Petroleum Development Oman Exploration Directorate, Muscat, Oman
2 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, USA
* Present affiliation: Independent Consultant, Muscat, Oman
Ahead of Print Abstract
Precambrian successions that have the spatial resolution to illustrate the transition from proximal shallow marine environments to deeper water, basinal environments through time are rare. Here we present a multidisciplinary study of the pre-salt Precambrian succession of Oman, both in cores and in outcrops, and provide a new correlation for the surface type sections to the subsurface. The ~2000 m-thick proximal, shallow marine Nafun-base Ara Groups Ediacaran type section (Huqf outcrops, central Oman) is correlated to new, near continuous cores of the ~800-1000 m-thick basinal succession in the subsurface of south Oman. We have used sedimentology, sequence stratigraphy, well logs, and carbon isotope chemostratigraphy for correlation, and built new depositional models and paleofacies maps. Our updated paleofacies maps support Ediacaran Nafun deposition controlled by regional thermal subsidence along a passive margin on the eastern side of the Mozambique Ocean. Progressively restricted marine conditions in the latest Ediacaran to Early Cambrian led to Ara Group evaporitic deposition in a syntectonic convergent margin setting. Shallow water carbonate deposits of the Khufai and Buah formations in NE Oman, and in Birba Formation carbonates on tectonically controlled highs across Oman retain porosity in many instances. The most organic-rich rocks are found in basinal deposits of the Masirah Bay, Khufai, Buah and Birba Formations in SW and W Oman while the Shuram Formation is notably organic poor. Our results add insights into source and reservoir rock distribution, and late Precambrian stratigraphy, paleogeography, and tectonic setting in Oman with global relevance.
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