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Controls on Diagenetic Mineralogy of Sandstones and Mudrocks from the Lower Hayang Group (Cretaceous) in the Daegu Area, Korea  

Shin, Young-Sik (Muhak High School)
Choo, Chang-Oh (Department of Geology, Kyungpook National University)
Lee, Yoon-Jong (Department of Earth Science, Kyungpook National University)
Lee, Yong-Tae (Dongbuk High School)
Koh, In-Seok (Department of Geology, Kyungpook National University)
Publication Information
Journal of the Korean earth science society / v.23, no.7, 2002 , pp. 575-586 More about this Journal
Abstract
Authigenic minerals found in sandstones and mudrocks of the Lower Hayang Group (Cretaceous) in the central part of the Kyungsang Basin are carbonate minerals (calcite, dolomite), clay minerals (illite, chlorite, C/S, I/S and kaolinite), albite, quartz and hematite. Characteristic diagenetic mineral assemblages are as follows: albite-chlorite (including C/S)-hematite in the Chilgog Formation, albite-illite-calcite in the Silla Conglomerate, illite-chlorite-hematite in the Haman Formation and albite-chlorite-dolomite in the Panyawol Formation, respectively. Among clay minerals reflecting the physical and chemical change of the diagenetic process, illite, the dominant clay mineral, occurs in every formation in the study area. Chlorite occurs mainly in green or gray sandstones and mudrocks, or in sandstones and mudrocks of the Chilogok Formation which contains a high content of volcanic materials. Based on the mineral assemblage, diagenetic minerals are strongly related with source rocks. Judging from the illite crystallinity, diagenesis of sandstones and mudrocks in the study area reached the late diagenetic stage or low grade metamorphisim. The diagenetic process was much influenced by intrusion of the Bulguksa granite, content of organic materials, grain size, and depositional environment rather than burial depth.
Keywords
Lower Hayang Group; sandstone; mudrock; diagenetic mineral; diagenesis;
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