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http://dx.doi.org/10.9727/jmsk.2012.25.4.249

Phlogopite-Bearing Orthopyroxenite in Andong Ultramafic Complex  

Jeong, Gi Young (Department of Earth and Environmental Sciences, Andong National University)
Lee, Seung Ryeol (Korea Institute of Geoscience and Mineral Resources)
Kwon, Seok-Ki (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.25, no.4, 2012 , pp. 249-261 More about this Journal
Abstract
Phlogopite-bearing orthopyroxenite occurs in Andong ultramafic complex in a planar body of about 1 meter thick, and consists mostly of coarse subhedral to euhedral orthopyroxene crystals. Minor minerals are clinopyroxene, phlogopite, and plagioclase with trace chromian spinel, pentlandite, apatite, and zircon. Clinopyroxene occurs as either exolution lamella or interstitial fillings with phlogopite and plagioclase. Electron microprobe analysis showed that orthopyroxenes are entatite, while clinopyroxenes are diopside with little chemical variation through samples. Hydrous alteration resulted in the formation of talc, amphibole, and serpentine from orthopyroxene, clinopyroxene, and plagioclase, respectively. The orthopyroxenite was probably formed by the fractional crystallization of the ultramafic magma. Radiogenic dating of phlogopite and zircon of the orthopyroxenite would reveal the age of the Andong ultramafic complex.
Keywords
Ultramafic; orthopyroxenite; Andong; phlogopite; zircon;
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Times Cited By KSCI : 10  (Citation Analysis)
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