Sedimentological analysis of two drill cores through the crater moat-filling breccia, Flynn Creek impact structure, Tennessee

De Marchi, L., Ormo, J., King, D. T., Adrian, D. R., Hagerty, J. J., Gaither, T. A. 2019. Sedimentological analysis of two drill cores through the crater moat-filling breccia, Flynn Creek impact structure, Tennessee. Meteoritics and Planetary Science 54, 11, 2864-2878 DOI: 10.1111/maps.13393

Sedimentological (line-logging) analysis of two drill cores, FC77-3 and FC67-3, situated, respectively, in the northwestern and southeastern quadrants of the Flynn Creek impact structure’s crater-moat area reveals that the similar to 27 m thick crater moat-filling breccia consists of three subequal parts. These parts, which were deposited during early modification stage of this marine-target impact structure, are distinguished on the basis of vertical trends in sorting, grain size, and counts of clasts per meter in comparison with other well-known marine-target impact structures, namely Lockne, Tvaren, and Chesapeake Bay. The lower part is interpreted to represent mainly slump deposits, and the middle part is interpreted to represent a stage intermediate between slump and marine resurge, that is, a traction flow driven by overriding suspension flow. The upper part (size graded, and relatively well sorted and fine grained) is interpreted to represent marine resurge flow only. The upper part is capped by a relatively thin and relatively fine-grained calcarenite to calcisiltite deposit.

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