Temporal chemical variations in late Cenozoic volcanic rocks around The Bandung Basin, West Java, Indonesia.

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  • SUNARDI Edy
    Department Geosciences, Geoscience Faculty of Science, Osaka City University<br>On leave from Depatment Geology, Faculty of Mathematics and Natural Sciences, Padjadjaran University
  • KIMURA Jun-ichi
    Geoenvironmental Research Laboratory, Department of Geology, Faculty of Education, Fukushima University<br>Present address: Department of Geoscience, Faculty of Science & Engineering

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  • インドネシア共和国，西ジャワ，バンドン盆地周辺に分布する後期新生代火山岩類の化学組成の時間変遷
  • Temporal chemical variations in late Ce

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Abstract

The Bandung Basin is located on axis of the Sunda arc in the West Java, Indonesia. This basin is underlain by dominant late Cenozoic volcanics. Lava samples were corrected from Quaternary Sunda and Tangkuban Perahu volcanoes and volcanics underlying these. Age of the lavas have been dated by K-Ar method to be ca. 4.1 Ma-ca. 0.04 Ma. Lavas are basalt to dacite in composition, and SiO2 contents range 51-63 wt.%. Both tholeiitic and calc-alkaline suites exist, and K2O 1evel covers medium-K to high-K suites. We used trace element for the estimation of primary basalt compositions. Model calculations using primary magma incompatible element contents examined the degree of partial melting of the source mantle occurred over the life of the suites. Continuous cooling of the mantle wedge was estimated, and a resurgence of degree of melting seems to have occurred between ca. 1.1 and ca. 0.6 Ma. Axial uplift took place in the Sunda arc during the period. This tectonic event may have been induced by a kinematic change in the subduction of the Indian-Australian Plate beneath the Sunda arc, which also affected the melting state of the upper mantle beneath the area.

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