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http://dx.doi.org/10.22807/KJMP.2021.34.4.293

Petrology of the Cretaceous Volcanic Rocks in Yeongdo island, Busan  

Kim, Dohyoung (Department of Earth Science, Pusan National University)
Yun, Sung-Hyo (Department of Earth Science, Pusan National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.34, no.4, 2021 , pp. 293-311 More about this Journal
Abstract
The volcanic rocks that make up Yeongdo island, an administrative district located on the southern coast of Busan, are composed of andesitic and rhyolitic rocks. Andesitic rock is mainly composed of volcanic breccia has a phenorysts of plagioclase and contains rock fragments. The rhyolitic rock is composed of volcanic angular rock at the base of Mt. Bongnae, and welded tuff forms the main mass of Mt. Bongnae. The fiamme structure can be easily observed with the naked eye, and the higher the altitude, the weaker the welded structure develops and the less the amount of rock fragments and crystals constituting the welded tuff. It is indicated that the magma that formed this study area is related to the tectonic environment of the continental margin related to subduction, and that it erupted after undergoing fractional cystallization at the same time with some contaminant in the continental crust. As a result of analyzing the main elements by altitude, it is believed to be the result of mixing at least 4 times or more of magma batches.
Keywords
Yeongdo island; volcanic breccia; welded tuff; subduction; magma batches;
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