Tectono-Sedimentary Models for Rift-Basin Carbonate Systems
Published:January 01, 2008
Nigel E. Cross, Dan W. J. Bosence, 2008. "Tectono-Sedimentary Models for Rift-Basin Carbonate Systems", Controls on Carbonate Platform and Reef Development, Jeff Lukasik, J.A. (Toni) Simo
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Detailed outcrop study of Miocene platform carbonates along the southwestern margin ofthe Gulf of Suez rift, together with an extensive review of comparable systems elsewhere, has generated new tectono–sedimentary models for marine rift–basin carbonate systems. Both syntectonic and post–tectonic platforms are described for various extensional settings in rift basins. Syntectonic platforms are defined as systems deposited during periods associated with active faulting in rift basins. Post–tectonic platforms are defined as carbonate systems deposited after periods of active extensional faulting that develop over preexisting, fault–generated rift topography. Carbonate systems that occupy transfer zones are also defined, which display the effects...
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Controls on Carbonate Platform and Reef Development
Carbonate platforms and reefs emerge, grow and die in response to intrinsic and extrinsic mechanisms forced primarily by tectonics, oceanography, climate, ecology and eustasy. These mechanisms, or controls, create the physical, biological and chemical signals accountable for the myriad of carbonate depositional responses that, together, form the complex depositional systems present in the modern and ancient settings. If we are to fully comprehend these systems, it is critical to ascertain which controls ultimately govern the “life cycle” of carbonate platforms and reefs and understand how these signals are recorded and preserved. Deciphering which signals produce a dominant sedimentological response from the plethora of physical and biological information generated from superimposed regional to global-scale controls is critical to achieving this goal. With this understanding, it may be possible to extract common time- and space-independent depositional responses to specific mechanisms that may, ultimately, be used in a productive sense. Extensive research on a wide variety of carbonate platform and reefal systems in the past few decades has provided the foundation and understanding necessary to take carbonate research to a new level. With assistance from rapidly advancing computer software and an increasing use of cross-disciplinary integration, carbonate research is shifting from description and morphological analysis towards a science that is more focused on the assessment of process and genetic relationships. The aim of this special publication is to present a cross section of recent research that shows this evolution from a variety of perspectives and scales using examples distributed throughout the Phanerozoic.