Troll, V. R. et al. (2013) Magmatic differentiation processes at Merapi Volcano: inclusion petrology and oxygen isotopes. Journal of Volcanology and Geothermal Research, 261, 38 - 49. (doi: 10.1016/j.jvolgeores.2012.11.001)
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Abstract
Indonesian volcano Merapi is one of the most hazardous volcanoes on the planet and is characterised by periods of active dome growth and intermittent explosive events. Merapi currently degasses continuously through high temperature fumaroles and erupts basaltic-andesite dome lavas and associated block-and-ash-flows that carry a large range of magmatic, coarsely crystalline plutonic, and meta-sedimentary inclusions. These inclusions are useful in order to evaluate magmatic processes that act within Merapi's plumbing system, and to help an assessment of which phenomena could trigger explosive eruptions. With the aid of petrological, textural, and oxygen isotope analysis we record a range of processes during crustal magma storage and transport, including mafic recharge, magma mixing, crystal fractionation, and country rock assimilation. Notably, abundant calc-silicate inclusions (true xenoliths) and elevated δ18O values in feldspar phenocrysts from 1994, 1998, 2006, and 2010 Merapi lavas suggest addition of limestone and calc-silicate materials to the Merapi magmas. Together with high δ13C values in fumarole gas, crustal additions to mantle and slab-derived magma and volatile sources are likely a steady state process at Merapi. This late crustal input could well represent an eruption trigger due to sudden over-pressurisation of the shallowest parts of the magma storage system independently of magmatic recharge and crystal fractionation. Limited seismic precursors may be associated with this type of eruption trigger, offering a potential explanation for the sometimes erratic behaviour of Merapi during volcanic crises.
| Item Type: | Articles |
|---|---|
| Additional Information: | The authors thank the Mineralogical Society of Great Britain and Ireland (Min Soc), Enterprise Ireland (EI), the Swedish Science Foundation (VR), the European Commission (EC), the Deutsche Forschungsgemeinschaft (DFG), the UK Natural Environmental Research Council (NERC), the National Research Foundation of South Africa, and the Centre for Natural Disaster Sciences (CNDS) at Uppsala University for their generous financial support. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Preece, Dr Katie |
| Authors: | Troll, V. R., Deegan, F. M., Jolis, E. M., Harris, C., Chadwick, J. P., Gertisser, R., Schwarzkopf, L. M., Borisova, A. Y., Bindeman, I. N., Sumarti, S., and Preece, K. |
| College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
| Journal Name: | Journal of Volcanology and Geothermal Research |
| Publisher: | Elsevier |
| ISSN: | 0377-0273 |
| Published Online: | 09 November 2012 |
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