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http://dx.doi.org/10.7854/JPSK.2018.27.3.121

Multiple Magmas and Their Evolutions of the Cretaceous Volcanic Rocks in and around Mireukdo Island, Tongyeong  

Hwang, Sang Koo (Department of Earth and Environmental Science, Andong National University)
Lee, So Jin (Department of Earth and Environmental Science, Andong National University)
Ahn, Ung San (World Natural Heritage Office, Jeju Special Self-Governing Province)
Song, Kyo-Young (Korea Institute of Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of the Petrological Society of Korea / v.27, no.3, 2018 , pp. 121-138 More about this Journal
Abstract
We have examined the petrotectonic setting and magmatic evolution from petrochemical characteristics of major and trace elements for the Cretaceous volcanic rocks in and around the Mireukdo Island. The volcanic rocks, can be devided into Jusasan, Unmunsa, Yokji and Saryang subgroups on the ascending order, are classified as basalt, basaltic andesite, andesite, dacite and rhyolite on TAS diagram. Petrochemical data show that the rocks are calc-alkaline series, and suggest that erupted earlier medium-K series and later high-K series. The volcanic rocks provide a case in which the calc-alkaline magma are formed, not only from separate protoliths, but following separate paths from source to surface. Earlier and later subgroups take different paths to the surface respectively, and are emplaced in the shallow crust as a series of discrete magma chambers through the volcanic processes. After emplacement, each chamber evolves indepently through fractional crystallization with a little assimilation of wall rock. The volcanic rocks have close petrotectonic affinities with orogenic suite and subduction-related volcanic arc. The rhyolitic magma can be derived from calc-alkaline andesitic magma by fractional crystallization with crustal assimilation, which may be derived from a partial melt of peridotite in the upper mantle.
Keywords
Mireukdo Island; Volcanic rocks; Calc-alkaline series; Volcanic arc; Separate path; Fractional crystallization; Assimilation;
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