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http://dx.doi.org/10.9719/EEG.2019.52.5.381

Carbonate Breccias of the Middle Cambrian Daegi Formation, Taebaeksan Basin  

Jang, Hwimin (Department of Geology, College of Natural Sciences, Kyungpook National University)
Son, Mira (Department of Geology, College of Natural Sciences, Kyungpook National University)
Ryu, In-Chang (Department of Geology, College of Natural Sciences, Kyungpook National University)
Publication Information
Economic and Environmental Geology / v.52, no.5, 2019 , pp. 381-393 More about this Journal
Abstract
Carbonate breccias occur sporadically in the Middle Cambrian Daegi Formation on the southern limb of the Baegunsan Syncline, Taebaeksan Basin. These carbonate breccias have been largely interpreted either as sedimentary breccias or as tectonic, fault-related breccias. Recent study, however, indicates that the majority of these breccias are a solution-collapse breccia which is causally linked to the paleokarstification. Extensive karstification is attributed to prolonged subaerial exposure of the carbonate platform. The exposed surface is a record of interruption in sedimentation on the carbonate platform. In the stratigraphic record, such karst-related post-depositional features are recognized as meteoric diagenetic features, paleosols, and solution-collapse breccias. Solution-collapse breccias are particularly well preserved and most profound in the carbonate rocks below the major unconformities, which also are evidence of prolonged subaerial exposure. The Middle Cambrian Daegi Formation provides an example of solution-collapse breccias. The formation and preservation of the solution-collapse breccias imply that a stratigraphic discontinuity surface (unconformity) can be designated within the Daegi Formation.
Keywords
Daegi Formation; Middle Cambrian; solution-collapse breccia; paleokarst; stratigraphic discontinuity Surface (unconformity);
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