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http://dx.doi.org/10.22807/KJMP.2020.33.2.87

Antirapakivi Mantled Feldspars from Sanbangsan Trachyte Lava Dome, Jeju Volcanic Field, Korea  

Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.2, 2020 , pp. 87-97 More about this Journal
Abstract
The compositions of the phenocrystic feldspars of the Sanbangsan trachyte range from labradorite(An53.6) to andesine(An35.4), and of the microphenocrysts and laths range from andesine(An31.2) to oligoclase(An18.7). Mantled feldspar which forms a thin rim around the phenocrysts and microphenocrysts, is anorthoclase(Or20.5An9.4) to sanidine(Or49.2An1.4). Phenocrystic plagioclase, which shows a distinct zonal structure, represents an oscillatory zoning in which the An content of the zone repeatedly increases or decreases between andesine (An39.3) and labradorite (An51.3) from the core toward the rim, and the rim of the phenocrysts is surrounded by alkali feldspar(Or31.9-39.4Ab63.2-57.0An4.9-3.7), showing the antirapakivi texture. Microphenocryst which does not represent the antirapakivi texture, shows the normal zoning with a decreasing An content (An36.4→An25.6) as it moves outward from the center of a crystal. As a result of X-ray mapping of K, Ca, and Na elements for the feldspar phenocrysts representing the typical zonal structure, shows the oscillatory zoning that six zones show the distinctive compositional differences, and the rims are mantled by alkali feldspar to indicate the antirapakivi texture. The groundmass is composed of K-enriched, Ca-poor alkali feldspar. The antirapakivi texture of feldspar which appears in Sanbangsan trachyte, may have been formed in mixing systems as a result of the juxtaposition of near liquidus melt, rich in alkali feldspar components(trachytic magma), with plagioclase phenocrysts and microphenocrysts already crystallized in a more mafic system.
Keywords
Sanbangsan; trachyte; feldspar; antirapakivi texture; magma mixing;
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Times Cited By KSCI : 2  (Citation Analysis)
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