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K-Ar Ages of Illite from Clay Veins Distributed in Granitic Rocks in the Korean Peninsula  

KITAGAWA Ryuji (Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University)
NISHIDO Hirotsugu (Hizene Research Institute, Okayama University of Science)
HWANG Jin-Yeon (Geological Environmental Science Major, Division of Earth Environmental System, Pusan National University)
JIGE Mayumi (Department of Environmental Security Systems, Faculty of Risk and Crisis Management, Chiba Institute of Science)
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.3, 2005 , pp. 215-225 More about this Journal
Abstract
Numerous clay veins along fractures such as fault, joints, cracks and small fissures are found in granitic rocks in the Korean Peninsula. Granitic rocks of three geological stages (Jurassic, Cretaceous and Paleogene) occur in the Korean Peninsula, and are known as the Daebo, Bulguksa and Hoam granites, respectively. Specimens from clay veins composed or mainly mica clay mineral (illite) were dated using the K-Ar method with the hosted granitoids. The respective ages were as follows. Jurassic: granites 143.7 Ma and 160 Ma, clay mineral veins 104 Ma and 107 Ma: Cretaceous: granite 133.2 Ma, clay mineral veins 93.6 Ma, 84.2 Ma and 84.3 Ma: Paleogene: granite 39.7 Ma and 35.4Ma, clay mineral veins 27.1 Ma and 23.9 Ma. The ages of the clay veins in the Korean Peninsula are clearly much younger than those of their hosted granitoids. This contrasts with data for similar clay veins in Cretaceous and Paleogene granitoids in southwest Japan, where the K-Ar ages of mica clay minerals are slightly younger than their host rocks, or are almost the same.
Keywords
K-Ar dating; clay vein; mica clay mineral; granite; hydrothermal activity;
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