Controls on Localization and Morphology of Moscovian (Late Carboniferous) Carbonate Buildups, Southern Amdrup Land, North Greenland
Lars Stemmerik, 2003. "Controls on Localization and Morphology of Moscovian (Late Carboniferous) Carbonate Buildups, Southern Amdrup Land, North Greenland", Permo-Carboniferous Carbonate Platforms and Reefs, Wayne M. Ahr, Paul M. (Mitch) Harris, William A. Morgan, Ian D. Somerville
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Small, isolated carbonate buildups are a common feature of many Upper Carboniferous-Lower Permian cyclic platform successions whereas larger buildup complexes are mostly confined to outer-ramp and slope settings. The Moscovian (Upper Carboniferous) platform succession at southern Amdrup Land, North Greenland, is unusual in including larger, stacked buildup complexes of limited lateral distribution. The buildup complexes developed as the result of stacking of shallow marine, algal-dominated buildups in areas that temporarily experienced increased rates of subsidence due to tectonic flexuring of the platform. The location of the buildup complexes is controlled by the interplay of short-term glacioeustatic fluctuations in sea level and tectonic subsidence. On the Amdrup Land platform, the buildup complexes are located 1-2 km seaward of the line of flexuring in areas that experienced moderately increasing subsidence rates and thereby new accommodation space. The location of Amdrup Land buildups highlights the importance of differential tectonic subsidence on localization and stacking of buildups in platform settings. In contrast to most published examples, the buildups are not associated with the development of positive sea-floor relief but are located in more rapidly subsiding parts of the platform where buildup morphology prevented destruction during glacioeustatic sea-level falls. The creation of new accommodation space allowed stacking of buildups during successive glacioeustatic sea-level rises and highstands. The platform was affected by two Moscovian tectonic flexuring events, each lasting for 1-2 My and separated by times of uniform platform subsidence and deposition of cyclic carbonates and siliciclastics, including laterally more widespread but vertically confined buildups.