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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 5 | Geoscience Letters

Fig. 5

From: Bromo activity over the last decade: consistent passive degassing and source magma evolution

Fig. 5

Bulk analysis results from ash samples collected during eruptive events. The total alkaline vs SiO2 indicates a basaltic-andesite to basalt trachy-andesite source (top) with a clear transition from medium-K to high-K melt source in the very recent period of Bromo activity (middle). The AFM diagram (bottom) (Irvine and Baragar 1971) highlights the transition between the tholeiitic and calc-alkaline sources. Data from Van Gervan and Pitchler (1995) and Carn and Pyle (2001) are plotted as references. Note that there are no data from the 2004 eruption

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