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Cabboic Xenoliths in Alkaline Basalts from Jeju Island  

Eom, Young-Bo (Division of Earth Environmental System, College of Natural Sciences, Pusan National University)
Nam, Bok-Hyun (Division of Earth Environmental System, College of Natural Sciences, Pusan National University)
Hwang, Byoung-Hoon (Division of Earth Environmental System, College of Natural Sciences, Pusan National University)
Kim, Jin-Seop (Division of Earth Environmental System, College of Natural Sciences, Pusan National University)
Yang, Kyung-Hee (Division of Earth Environmental System, College of Natural Sciences, Pusan National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.2, 2007 , pp. 103-114 More about this Journal
Abstract
Gabbroic xenoliths in poikilitic and equigrnular textures and plagioclase megacrysts, up to 15 cm in size, are trapped in alkaline basalts from Sinsanri and Sangeumburi, Jeju island. Gabbroic xenoliths are gabbro norite in composition. Plagioclase is the most dominantly present $(42{\sim}94vol%)$, while olivine crystals are absent. Pokilitic xenoliths, interpreted as cumulates, include euhedral opx+cpx in oikocryst plagioclase. Equigranular xenoliths include subhedral to anhedral opx+cpx+pl. Based on the textural and geochemical natures, occurrence mode at the outcrops, poikiltic and equigranular xenoliths and plagioclase megacrysts were from rigid zone, mushy zone and crystal-suspended zone of the magma chamber, respectively. The gabbroic xenoliths in alkaline basalts of the Juju island represent crystallization products of relatively evolved basaltic magma at the Jeju magma reservoir beneath the Jeju Island. They are gabbro fragments that represent crystallization-isolation-capture processes associated with magma batches temporarily occupying reservoirs.
Keywords
Jeju Island; gabbroic xenoliths; poikilitic; cumulate; magma chamber;
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