Surface and subsurface reworking by storms on a Cambrian carbonate platform: evidence from limestone breccias and conglomerates
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Date
2014-03-31
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Wydawnictwo Naukowe UAM
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Abstract
Some limestone breccias and conglomerates from the Furongian (Late Cambrian) Chaomidian Formation (Shandong
Province, China) were investigated in order to understand the depositional and deformational processes induced by
storms. The sediments under study occur in a hummocky cross-stratified peloidal grainstone layer. The limestone
conglomerates consist of well-rounded clasts that are mostly flat-lying or imbricated, and have erosional bases. They
formed by surface reworking (erosion and rip-up) of thin-bedded grainstones by storm waves and currents. The lime -stone breccias consist of subangular to subrounded clasts of grainstone, which are often associated with small-scale
grainstone clastic dykes. The breccias and dykes resulted from subsurface soft-sediment deformation (i.e., differential
liquefaction and fluidization of heterogeneously cemented carbonate grains), most likely triggered by storm-wave load -ing. The limestone breccias and conglomerates bear important implications for understanding the reworking mecha -nisms of storms on ancient carbonate platforms.
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Keywords
limestone breccia, limestone conglomerate, soft-sediment deformation, clastic dyke, North China Platform
Citation
Geologos, 2014, 20, 1, s. 13-23
ISBN
978-83-232187-4-6