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<p>The Modryń Ramp is a rare Frasnian example of a tropical, shallow-water, heterozoan-dominated carbonate depositional system. It is unique due to its partly restricted cyclic sedimentation, characterized by recurring hypoxic and high-salinity conditions in the distal and central ramp zones. Its development has been reconstructed based on a continuous, fully-cored borehole profile Korczmin IG 1 (SE Poland). The chronostratigraphy was established using both archival and new conodont data, which made it possible to correlate most of the low-frequency regional transgressive-regressive cycles with Frasnian eustatic sea-level changes. Saw-cut cores, thin sections, wireline logs, magnetic susceptibility, and TOC data were instrumental in analyzing metre-scale cyclicity patterns characterizing the succession of facies zones, from distal to central and proximal ramp areas. Mid-Frasnian central and proximal ramp cycles are attributed mainly to tectonic controls, whereas lower and upper Frasnian distal ramp cyclicity was likely driven by astronomically-forced glacio-eustasy modified by autocyclic processes.</p>

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Cyclic deposition on a Frasnian heterozoan-dominated restricted ramp (Devonian Lublin Basin, SE-Poland)

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Marek Narkiewicz,
  • Katarzyna Narkiewicz,
  • Jacek Grabowski

摘要

The Modryń Ramp is a rare Frasnian example of a tropical, shallow-water, heterozoan-dominated carbonate depositional system. It is unique due to its partly restricted cyclic sedimentation, characterized by recurring hypoxic and high-salinity conditions in the distal and central ramp zones. Its development has been reconstructed based on a continuous, fully-cored borehole profile Korczmin IG 1 (SE Poland). The chronostratigraphy was established using both archival and new conodont data, which made it possible to correlate most of the low-frequency regional transgressive-regressive cycles with Frasnian eustatic sea-level changes. Saw-cut cores, thin sections, wireline logs, magnetic susceptibility, and TOC data were instrumental in analyzing metre-scale cyclicity patterns characterizing the succession of facies zones, from distal to central and proximal ramp areas. Mid-Frasnian central and proximal ramp cycles are attributed mainly to tectonic controls, whereas lower and upper Frasnian distal ramp cyclicity was likely driven by astronomically-forced glacio-eustasy modified by autocyclic processes.