Solutionâ€collapse breccias of the Minkinfjellet and Wordiekammen Formations, Central Spitsbergen, Svalbard: a large gypsum palaeokarst system
- Permanent Link:
- Solutionâ€collapse breccias of the Minkinfjellet and Wordiekammen Formations, Central Spitsbergen, Svalbard: a large gypsum palaeokarst system
- Series Title:
- Eliassen, Arild
Talbot, Michael R.
- Wiley Online Library
- Publication Date:
- Subjects / Keywords:
- Breccia ( local )
Evaporites ( local )
Karst ( local )
Limestones ( local )
Spitsbergen ( local )
Stable Isotopes ( local )
- serial ( sobekcm )
- Large volumes of carbonate breccia occur in the late synâ€rift and early postâ€rift deposits of the Billefjorden Trough, Central Spitsbergen. Breccias are developed throughout the Moscovian Minkinfjellet Formation and in basal parts of the Kazimovian Wordiekammen Formation. Breccias can be divided into two categories: (i) thick, crossâ€cutting brecciaâ€bodies up to 200â€ƒm thick that are associated with breccia pipes and large Vâ€structures, and (ii) horizontal stratabound breccia beds interbedded with undeformed carbonate and siliciclastic rocks. The thick breccias occur in the central part of the basin, whereas the stratabound breccia beds have a much wider areal extent towards the basin margins. The breccias were formed by gravitational collapse into cavities formed by dissolution of gypsum and anhydrite beds in the Minkinfjellet Formation. Several dissolution fronts have been discovered, demonstrating the genetic relationship between dissolution of gypsum and brecciation. Textures and structures typical of collapse breccias such as inverse grading, a sharp flat base, breccia pipes (collapse dolines) and Vâ€structures (cave roof collapse) are also observed. The breccias are cemented by calcite cements of preâ€compaction, shallow burial origin. Primary fluid inclusions in the calcite are dominantly single phase containing fresh water (final melting points are ca 0â€ƒ°C), suggesting that breccia diagenesis occurred in meteoric waters. Cathodoluminescence (CL) zoning of the cements shows a consistent pattern of three cement stages, but the abundance of each stage varies stratigraphically and laterally. Î´18O values of breccia cements are more negative relative to marine limestones and meteoric cements developed in unbrecciated Minkinfjellet limestones. There is a clear relationship between Î´18O values and the abundance of the different cement generations detected by CL. Paragenetically, later cements have lower Î´18O values recording increased temperatures during their precipitation. Carbon isotope values of the cements are p
- Original Version:
- Sedimentology, Vol. 52, no. 4 (2005-07-11).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
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- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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