A Review on the Geology and Basin Evolution History of the Myogok Formation

초록

The Myogok Formation, exposed in limited areas of the northern Yeongyang Sub-basin of the Gyeongsang Basin, represents the only stratigraphic unit deposited between the Daedong and Gyeongsang Supergroups in the southern Korean Peninsula. This unique stratigraphic position makes the formation crucial for understanding the Mesozoic crustal evolution of the Korean Peninsula. Comprehensive paleontological data and absolute age dating results have recently constrained the depositional age of this formation to the Early Cretaceous (Berriasian or younger). The formation exhibits distinctive contractional structures that are notably absent in the overlying Gyeongsang Supergroup, indicating a significant deformation that affected the Myogok Formation prior to the deposition of the Gyeongsang Supergroup. This review synthesizes previous studies on sedimentological, petrological, and structural characteristics, depositional timing, and basin evolution of the Myogok Formation. We examine its potential relationship with the Daebo Orogeny, and suggest directions for future research.

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