Evolution of Frasnian Mixed Carbonate-Siliclastics Systems: Outcrop-Based Characterization of Sequence Stratigraphy and Architecture, Cline Channel and Jasper Basin Areas, Alberta, Canada

Abstract

Ten (third-order) Composite Sequences are recognized within a Second-Order depositional sequence spanning the uppermost Givetian to the base of the Famennian from the Alberta basin. The eight youngest composite sequences are defined from the Cline Channel and Jasper Basin areas utilizing stratal and facies stacking patterns, regional correlation of sequence boundaries and maximum flooding surfaces integrated with conodont biostratigraphy. Most sequence boundaries observed are subaerial exposure surfaces, seen in outcrop or inferred from onlap of tidal flat or reef margin deposits onto foreslope facies. The Cline Channel is filled asymmetrically from southeast to northwest within the study area. Progradation is on a foundation of bank derived fine grained carbonates and extra-basinal clays (forming argillaceous carbonates and calcareous shales). In the Cripple Creek area, on the southern margin of the Cline Channel, the second order Frasnian cycle is characterized by initial retrogradation followed by aggradation to retrogradation and finally, progradation in the upper Frasnian. At Wapiabi Gap the overall stacking pattern is aggradational. In both the Cline Channel and the Nikanassin area of the Jasper Basin, decreasing accommodation within the second order highstand is exemplified by the reduction of composite sequence thickness and the replacement of open marine with bank interior facies as the basin

AAPG Datapages/Search and Discovery Article #90259 ©2016 AAPG Annual Convention and Exhibition, Calgary, Alberta, Canada, June 19-22, 2016