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Is There any Change from Magma Mixing in Kelud Characteristics?

International Journal of Scientific and Technical Research in Engineering (IJSTRE). 2017.

English

Jurnal

Kelud volcano is located in East Java Province, Indonesia. According to Geochemical study of Kelud Volcano, it could be divided into 3 periods which are Kelud I (older than 100 ky BP), Kelud II (40 – 100 ky BP), and Kelud III (younger than 40 ky BP). A specific petrogenesis of Kelud are dominatad by magma mixing and fractional crystalization. New petrological data from Kelud volcano was taken through products of the eruption in 1990 (Vulkanian type), 2007 (Lava plug forming) and 2014 (Plinian type). Petrographic study on these rocks showed that reverse and oscilatory zoning on plagioclases, Shieve-like and corroded textures on plagioclases and pyroxenes are common. However, normal zoning textures were also found on plagioclases and pyroxenes. Whole rock study on these rocks showed all rocks were classified into Basalt to Andesite in composition with calc-alkaline group. The study indicated that their magma origin derrived from slab with fractional crystallization during in the magma reservoir, and magma mixing processes are dominant expecially in magma pockets. Concequently, the magma origin and petrogenesis of Kelud magma after the 1966 eruption are still the same as those of old magma of Kelud