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http://dx.doi.org/10.7854/JPSK.2016.25.1.1

Petrological Study on the Volcanic Rocks in Namoo and Namhyeongje Island, Off the Southern Coast of Busan City, Korea  

Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.25, no.1, 2016 , pp. 1-12 More about this Journal
Abstract
This study reports the results about the petrography of volcanic rocks in Namoo island and Namhyeongje island, off the southern coast of Busan City. The rocks in the Namhyeongje island composed of dacitic crystal-vitric welded tuff, showing phenocrysts of plagioclase, rock fragment with flow structure of elongated and flattened pumice fragments. In thin section it shows pyroclastic texture. The volcanic rocks in Namoo island are mainly dark grey-bluish dacite with phenocrysts of plagioclase and gradually changed to pink-greyish rhyodacite with auto-brecciated. In the northeastern part of the island, the volcanic rocks occurred as aggromerate with a poorly sorted mixture of blocks, lappili and ash and felsic feeder dike intrude the aggromerate. Major element composition of the volcanic rocks in Namhyeongje island and Namoo island are $SiO_2$ 73.6~74.4 wt.% and 65.5~68.3 wt.%, respectively. The volcanic rocks in these island are felsic volcanic rocks.
Keywords
Namoo island; Namhyeongje island; dacite; rhyolitic crystal vitric tuff; agglomerate; feeder dike;
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1 Chang, T.W., Kang, P.J., Park, B.H., Hwang, S.K., and Lee, D.W., 1983, Explanation text and geologic map(1:50,000) of Pusan and Gadeok sheet. KIGAM, 53p.
2 Cho, H.S., Kim, J.S., Son, M., Sohn, Y.K., and Kim, I.S., 2011, Petrography and $^{40}Ar/^{39}Ar$ ages of the volcanic rocks in the Cretaceous Daedaepo basin, Busan: Accumulation time and correlation of the Dadaepo Formation. Journal of Geological Society of Korea, 47, 1-18.
3 Hwang, S.K., 2012, Tectonic setting and arc volcanisms of the Gyeongsang arc in the southeastern Korean peninsula. Journal of Petrological Society of Korea, 21, 367-383.   DOI
4 KIGAM, 1996, Geological map of Busan sheet(1:250,000), Korea Institute of Geology, Mining and Materials, Korea
5 Kim, S.W., Lee, J.Y., Kim, Y.K., and Koh, I.S., 1991, Petrology of Cretaceous volcanic rocks in southern Yuchon minor basin. Journal of Geological Society of Korea, 27, 24-39.
6 Kim, H.M., Kim, J.S., and Son, J.D., 2006, Report of the volcanic geology of Yeongdo lighthouse and Mokdo island, activation of marine culture and uninhabited Islands tourism linkages research. Busan Regional Maritime Affairs and Fisheries Office, 271-274.
7 Koh, J.S., Kim, E.H., and Yun, S.H., 2004, Petrology of the Cretaceous igneous rocks in Gadeog island, Busan, Korea. Journal of Petrological Society of Korea, 13, 47-63.
8 Le Bas, M.J., Le Maitre, R.W., Streckeisenm A., Zanettin, B., and IUGS, 1986, A chemical classification of volcanic rocks based on the Total Alkali-Silica Diagram. Journal of Petrology, 27, 745-750.   DOI
9 Lee, S.M., Kim, S.W., and Jin, M.S., 1987, Igneous activities of the Cretaceous to the Early Tertiary and their tectonic implications in South Korea. Journal of Geological Society of Korea, 23, 338-359.
10 Min, K.D., Kim, O.J., Yun, S.K., Lee, D.S., and Joo, S.W., 1982, Applicability of plate tectonics to the post-late Cretaceous igneous activities and mineralization in the southern part of South Korea(I). Mining Geology, 15, 123-154.
11 Son, M., Kim, J.S., Hwang, B.H., Lee, I.H., Kim, J.M., Song, C.W., and Kim, I.S., 2007, Paleogene dyke swarms in the eastern Geoje Island, Korea: their absolute ages and tectonic implications. Journal of Petrological Society of Korea, 16, 82-99.
12 Sun, S.S. and McDonough, W.F., 1989, Chemical and isotopic systematics of oceanic basalts; implications for mantle composition and processes. In: Magmatism in the ocean basins. Saunders, A.D. and Norry, M.J. (Editors), Geological Society of London, London, 42, 313-345.
13 Yun, S.H., Kim, J.S., and Kim, Y.L., 1994, Petrology of the Cretaceous volcanic rocks in Pusan area, Korea(II): - Petrogenesis and tectonic setting-. Journal of Korean Earth Science Society, 15, 356-365.
14 Winchester, J.A. and Floyd, P.A., 1977, Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology, 20, 325-343.   DOI
15 Wood, D.A., 1980, The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas on the British Tertiary Volcanic Province. Earth and Planetary Science Letters, 50, 11-30.   DOI
16 Yun, S.H., 1998, Volcanic activiy and petrology of the Cretaceous volcanic complex in Yuchon volcanic field of southeastern Korea. Journal of Korean Earth Science Society, 19, 408-424.
17 Yun, S.H., Koh, J.S., and Kim, Y.L., 1996, Petrology of the Cretaceous andesiic volcanic rocks in southern Pusan area:- with special reference to Songdo-Tadaepo area-. Journal of Korean Earth Science Society, 17, 472-488.