search for




 

Carbonate Breccias of the Middle Cambrian Daegi Formation, Taebaeksan Basin
태백산분지 캠브리아 중기 대기층 내의 탄산염 각력암
Econ. Environ. Geol. 2019 Oct;52(5):381-93
Published online October 31, 2019;  https://doi.org/10.9719/EEG.2019.52.5.381
Copyright © 2019 the Korean society of economic and environmental gelology.

Hwimin Jang, Mira Son and In-Chang Ryu*
장휘민 · 손미라 · 유인창*

Department of Geology, College of Natural Sciences, Kyungpook National University, Daegu 41566, Korea
경북대학교 자연과학대학 지질학과
Received September 28, 2019; Revised October 22, 2019; Accepted October 24, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 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)

 

December 2019, 52 (6)