The study of volcanic architecture in several selected areas in the Spanish Iberian Pyrite Belt (IPB) has been correlated with the chemical variation of the volcanic rocks. Results have been compared with those recently reported in the literature, both at a regional and at a local scale, in order to assess the spatio-temporal relationships of the bimodal IPB volcanism, generally agreed to consist of a basic series and a roughly continuous dacite-rhyolite series. In the studied areas, however, dacitic and rhyolitic rocks occur as clearly separate volcanic pulses, which can be distinguished by their petrographic and geochemical features. In areas such as that of the Odiel river, it is also shown that chemical composition, either dacitic or rhyolitic, is characteristic of entire volcanic packages, irrespective of the volcanic mechanisms. Variations within each of the two felsic groups also occur, partly overlapping the differences between them. We propose that the IPB felsic volcanic series may consist of two separate pulses, respectively dacitic and rhyolitic. Accordingly, we suggest that in VHMS areas where separate volcanic episodes occur, each of these may have a characteristic age and relation with the interbedded VHMS deposits.
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- Local and regional geochemical variations in VHMS-related felsic volcanic series in the Iberian Pyrite Belt
- Springer Berlin Heidelberg
- Chapter 6-19
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