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Lithology and Geology of Deokjeok Island, Western Gyeonggi Massif, Central Korea
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 Title & Authors
Lithology and Geology of Deokjeok Island, Western Gyeonggi Massif, Central Korea
Aum, Hyun Woo; Kim, Yoonsup; Cheong, Wonseok;
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 Abstract
We investigated the lithology and petrography of granites and metasedimentary rocks in Deokjeok Island at the western margin of the Gyeonggi massif. The major lithology comprises the biotite granite that intrudes all other types of rocks. A minor amount of mylonitized porphyritic granite crops out along the southeastern coast. Metasedimentary rocks in the north are further divided into: (1) sheared quartzite-schist to the northeast; and (2) relatively less-deformed, low-grade metasedimentary rocks to the northwest. The former contains quartz grains showing undulatory extinction and subgrain aggregates as well as minor amount of primary chlorite and biotite in the muscovite-rich matrix. Metamorphic condition belongs to the greenschist facies or the biotite zone. On the other hand, the latter unit consists of meta-conglomerate, meta-sandstone, meta-pelite, and black slate. Regardless of the lithology, the intensity of deformation apparently increases eastward to develop the flow banding of quartz in the shear zone.
 Keywords
Gyeonggi massif;Deokjeok Island;granites;meta-sedimentary rock;shear zone;
 Language
Korean
 Cited by
1.
An occurrence of the post-orogenic Triassic strata on Deokjeok Island, western Gyeonggi massif, Korea, Geosciences Journal, 2014, 18, 2, 137  crossref(new windwow)
2.
Petrological characteristics of the Yeongdeok granite, The Journal of the Petrological Society of Korea, 2014, 23, 2, 31  crossref(new windwow)