ABSTRACT: Cretaceous and Early Cenozoic Nonmarine Sedimentation and Tectonic History of Kyongsang Basin, Southeastern Korea

CHANG, KI-HONG, Department of Geology, Kyungpook National University, Daegu, Korea

A dextral motion about 35 km of the early Cenozoic Yangsan fault is deduced through a detailed stratigraphy of the complex crustal blocks adjacent to the fault, which was involved in the extensional tectonics prior to the opening of the Japan Sea. An Early Cretaceous paleocurrent analysis near the Japan Sea indicates a mean source area in the direction of N54E. Derived therefrom, reddish radiolarian chert pebbles occur in the late Early Cretaceous Hayang Group. The radiolarians secured from these chert pebbles range in age from the Middle Permian to Early Jurassic. Coeval radiolarites, not at all found on Korean peninsula, are widely distributed in the Tamba-Mino-Ashio and Chichibu belts of Japan. Some or all of these belts must have been the major source area of the Kyongsang basin.< P>

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)