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• W3048379724 abstract "Petrologic and geochemical databases of erupted products are critical for monitoring and predicting the evolution of active volcanoes. To monitor the activity of one of the most dangerous volcanoes in the world, Merapi Volcano in Indonesia, in the framework of the new instrumental site VELI (Volcans Explosifs - Laboratoires Indonesiens labelled by INSU in 2009 in France), we generated MERAPIDATA, a complete database of available petrologic and geochemical data published in the literature on pyroclastic flows, tephra, lavas and xenoliths coupled with the exact ages of historical flows [1] or estimated ages based on 14C geochronology [2]. MERAPIDATA permits to access complete petrologic, geochemical, and geochronological information (e.g., major, trace element and Sr-Nd-Pb-O isotopic composition of the bulk volcanic rocks, xenoliths, minerals and glasses; textural information; type of eruption; classification) of a given volcanic product or series. In addition to ~300 published volcanic products, new data on 2 pyroclastic flows, 1 tephra and 4 ash samples collected on northern and western slopes of the volcano in October and November 2010 during subplinian type eruption have been added to MERAPIDATA. The 2010 ash sample chemistry allows classifying them as high-K basaltic andesite. The ash samples demonstrate major and trace element compositions typical for the high-K series. For the first time, we obtained complete data on the Merapi ash samples which characterized by low L.O.I. ≤ 0.58 wt%, CO2total ≤ 0.05 wt%, H2Ototal = 0.3 - 0.5 wt%, Stotal ≤ 0.13 wt% and moderate Cl (550 - 1120 ppm) contents. The ash-leachates produced by leaching experiments demonstrate constant F/Cl ratios (0.05 ± 0.01) and Ca-Na-K enrichment (Ca/Na= 3 - 7, Na/K = 1 - 5). Sr-Nd-Pb-O isotopic analyses on the 2010 Merapi products are in progress. New petrologic (e.g., melt and fluid inclusion data, T - P - fO2 - aH2O - aCO2) and geochemical (e.g., volatile, major, trace element and isotopic composition of the bulk volcanic rocks and glassy matrix) data will permit to explain unexpected subplinian type of the 2010 eruption. The complete MERAPIDATA programmed with MS Access 2007 will be available in English version for open access at the website of the Observatory of Midi-Pyrenees (Toulouse, France): http://www.get.obs-mip.fr/index.php/Annuaire/Borisova-Anastassia/MERAPIDATA. [1] Camus et al., (2000). JVGR 100, 139-163. [2] Gertisser & Keller (2003). JVGR 123, 1-23." @default.
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• W3048379724 date "2011-12-01" @default.
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• W3048379724 title "MERAPIDATA: New Petrologic and Geochemical Database of the Merapi Volcano, Central Java, Indonesia" @default.
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