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

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 me...

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Veröffentlicht in:Gankō : Ganseki Kōbutsu Kōshō Gakkai shi PETROLOGY AND ECONOMIC GEOLOGY, 1998, Vol.93(4), pp.103-128
Hauptverfasser: SUNARDI, Edy, KIMURA, Jun-ichi
Format: Artikel
Sprache:eng ; jpn
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Zusammenfassung: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.
ISSN:0914-9783
1881-3275
DOI:10.2465/ganko.93.103