watt_supporting_fig1.pdfPDF document1361KStratigraphic columns for the Ap1, Ho1 and Palena deposits, at representative proximal sites. Sample names and positions are indicated in italics, for all analysed samples (melt inclusions and bulk compositions). Site coordinates are given in Table S1. A column is not provided for South Minchinmávida, since this unit was sampled from a single exposure in the scoria cone itself, rather than from a locally dispersed fall deposit.
watt_supporting_fig2.pdfPDF document1365KData plotted as in Figure 2a, but for a wider range of MgO contents, and discriminating between individual arc stratovolcanoes (Osorno to Maca) [López-Escobar et al., 1992, 1993, 1995; D'Orazio et al., 2003; Naranjo and Stern, 2004; Gutierrez et al., 2005; Watt, 2010; Watt et al., 2011a]. Also shown are compositions of degassed melt inclusions, following correction for post-entrapment olivine crystallisation. Degassed inclusions required large corrections; note their wide scatter, in contrast to the clustered data of their undegassed counterparts.
watt_tables1.pdfPDF document24KMelt inclusion major element, trace element, H2O, and CO2 contents, and host olivine forsterite number. Each line refers to an analysis of a single melt inclusion. For each sample, several melt inclusions were analysed from multiple olivine crystals. Olivine and glass compositions (major elements) were measured by electron microprobe (JEOL8600, University of Oxford, U.K.); selected trace elements, CO2 and H--2O were measured by ion microprobe using secondary-ion mass spectrometry (Cameca-ims-4f, University of Edinburgh, U.K.) (see supplementary text for details).
watt_tables2.pdfPDF document25KThe same data provided in Table S1, corrected for post-entrapment crystallisation of olivine. Corrections were made using PETROLOG [Danyushevsky, 2011] (see text for details). Inclusions defined as degassed, on the basis of their low CO2 contents, are labelled.
watt_tables3.pdfPDF document18KCalculated primary melt compositions and melting parameters (melt fraction, mantle source water concentration, melt equilibrium temperature, melt equilibrium pressure, slab surface temperature) for undegassed melt inclusions.
watt_tables4.pdfPDF document24KCompositions of whole rock samples for the scoria examined in this study, measured by XRF at the Open University, Milton Keynes, U.K., and by solution ICP-MS at Oxford University, U.K. (see text for details).
watt_tables5.pdfPDF document21KICP-MS whole rock data for the same trace elements as were measured by ion-probe in olivine-hosted melt inclusions. Data are for coarse, proximal scoria samples, which are the equivalent to the samples analysed in the melt inclusion dataset. XRF data are also provided for the same group of elements, for comparison. The percentage difference between mean ICP-MS and melt-inclusion values is provided to indicate the relative consistency between the two datasets; the two are not expected to be identical due to evolution of the melt between entrapment in olivine grains and final eruption.
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