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http://dx.doi.org/10.22807/KJMP.2021.34.4.277

Crystal Populations Within a Porphyritic Dike in Ulleung Island: Are All Clinopyroxenes in the Stage I Dodong Basalt Sectored?  

Munkhbayar, Enkhjin (Department of Geology, Kyungpook National University)
Park, Jongkyu (Department of Geology, Kyungpook National University)
Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.34, no.4, 2021 , pp. 277-291 More about this Journal
Abstract
A mineral phase contained in a rock sample can be categorized into several crystal populations with distinct origins and crystal growth histories. A detailed textural and mineralogical investigation on a clinopyroxene megacryst-bearing porphyritic dike with glassy chilled margins (tachylyte) in the southeastern Ulleung Island was conducted to decipher its crystal populations. During this study, we have measured glass and mineral major element compositions using electron microprobe analyzer. Tachylyte has a homogeneous trachyandesitic composition without any significant alteration characteristics, suggesting that its composition may represent the original melt composition of the dike. Clinopyroxene and plagioclase larger than 0.5 mm are antecrysts equilibrated with a more primitive melt composition than trachyandesitic tachylyte. Meanwhile, clinopyroxene and plagioclase microlites (<0.5mm) are regarded as primocrysts crystallized in-situ. According to our results, all clinopyroxenes in the Stage I Dodong Basalt are sectored into basal and prismatic parts, whose compositional ranges systematically vary: [Mg+Si+Fe]basal ↔ [Al+Ti+Na]prism. Therefore, we suggest that the effect of the elemental partitioning caused by the clinopyroxene sector zonation in Stage I volcanism should be considered in the future works.
Keywords
Crystal population; Clinopyroxene; Plagioclase; Dodong basalt; Ulleung island;
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