International audience41 obsidian from geological sources of SW Colombia and Ecuador were analysed by ICP-AES and ICP-MS to contribute to the build-up of a database for obsidian provenience studies. It is shown that obsidians from the Colombian Paletara caldera (Río Hondo and Río Granates compositional groups), the Ecuadorian sierra de Guamaní (Mullumica/Callejones and Quiscatola/Yanaurcu groups) and North Cotopaxi volcano (Quebrada Colorada group) can be easily distinguished from each other. It is also shown that obsidians with a given chemical composition may be found over a large distance, up to >100 km from volcanic structures (e. g. from ignimbrites to calites in NW of Paletara caldera)
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