Sample collection was restricted to pumice from plinian fallout, from thin distal ignimbrite, and from

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1 DATA REPOSITORY APPENDIX 1. ANALYTICAL TECHNIQUES Sample collection was restricted to pumice from plinian fallout, from thin distal ignimbrite, and from proximal lithic breccias deposits (Fig. DR1 and following table) Table. Samples of CI eruption studied for this work Pumice sample Eruptive unit Sampling site Position in eruptive unit PCF0033 plinian fall Acqua Fidia lower fallout, bottom PCF0035 plinian fall Acqua Fidia upper fallout, top PCF0031 ignimbrite Mondragone lower pyroclastic flow PCF0032 ignimbrite Mondragone upper pyroclastic flow PCFOF3D ignimbrite Caserta upper pyroclastic flow BM001 lithic-rich breccia Procida Pozzo Vecchio breccia BM002 lithic-rich breccia Procida Pozzo Vecchio breccia PCF005 lithic-rich breccia Procida Pozzo Vecchio breccia PCF009 lithic-rich breccia S.Arpino breccia PCF0010 lithic-rich breccia Trefola quarry breccia, bottom PCF0012 lithic-rich breccia Trefola quarry breccia, top PCF001 lithic-rich breccia Monte di Procida Acquamorta upper flow PCF0025 lithic-rich breccia Procida harbour upper flow The juvenile fractions show variable crystal content. Pumices from the Plinian fallout have a crystal content of ~5% vol., while the juvenile fraction of the ignimbritic phase has a very low crystal content (<< 5% vol.). In the lithic-rich breccia unit, subaphyric pumice (80% vol. of the juvenile fraction) coexists with porphyritic pumice, scoriae, and vitrophyre that are characterized by a relatively high crystal content (~30% vol.). K-feldspar (Or ) is the dominant mineral phase, followed by clinopyroxene, plagioclase (Ab 60 An 30 ), biotite, and minor Fe Ti oxides and apatite (Tables DR1 and DR2). Clinopyroxene is present as unzoned salite crystals (Wo 48 Fs 12 Wo 50 Fs 14 ). A few crystals are characterized by a diopsidic core (Wo 47 Fs 5 ) and a sharp transition to thick salitic rims (Wo 49 Fs 13 ). Rare unzoned diopsidic clinopyroxene is only found in products from the lithic-rich breccia. Bulk rock samples were analyzed by XRF spectrometer ARL 9400 XP. SEM-EDS microanalysis was carried out on individual minerals, on MIs in phenocrysts, and on matrix glasses using a Philips XL30 EDAX

2 Genesis apparatus. Operating conditions were 20 kv and about 0.1 na beam current. A raster area of about 100 µm2 was employed for glass analysis to reduce the light element loss. The analyses were normalized to 100 wt% due to the EDAX software used. All MIs selected for analysis had a glassy appearance. The major element compositions of MIs (Table DR5) do not show any significant depletion or enrichment of elements that would indicate posttrapping crystallization of the host mineral. H 2 O content in MIs was determined by FTIR, using a Nicolet Magna-IR560 spectrometer coupled with a NicPlan infrared microscope. Typical analyses employed 512 scans. At least three spectra for different areas were collected for each MI. The concentrations C were calculated according to the Beer-Lambert law: C=100xAxM/[εxρxd], where A (absorbance) is the height of the IR absorption peaks, M the molar mass (g.mol -1 ), ε the molar absorptivity (lxmol -1 cm), ρ the density (g.cm -3 ) of glass (CI trachytic obsidian fragment) measured with a pycnometer (2390 g/l), and d the thickness measured by visual determination under a calibrated microscope with an error of 2-3 µm depending on the proximity of a given inclusion to the edge of the wafer. The quantitative procedure and the absorption band assignements described in Silver et al. (1990) and Wallace et al. (1999) were followed in this work. The molar absorptivity values chosen were: 62 for the 3570 cm -1, 1.36 for 5200 cm -1, and 1.58 for 4500 cm -1 bands, according to Di Matteo et al. (2004). The relative proportions of the two hydrous species (Fig. DR2) confirm the high cooling rate (Silver et al., 1990) hypothesized for MIs from fallout deposits. No C peak is observable above the background, indicating the CO 2 is below detection limit (about 50 ppm, depending on MI thickness). It has to be noted that H 2 O contents measured in this work are higher than the ones reported by Signorelli et al. (2001) on the same eruptive units (H 2 O 1.5 wt%). This discrepancy is due to the different method used in measuring the thickness of the glass inclusions. We maintain that the direct measurement performed in this study, although more time consuming, gives more reliable water concentration data. Homogenization experiments were carried out on doubly polished wafers of cystals separated from the pumice clasts. Only glassy MI, with a clear shrinkage bubble and no evidences of heterogeneous trapping

3 [Roedder, 1984], were chosen. For the high-temperature experimental study of MI a modified Leitz 1350 heating stage was used. The temperature was measured with a Pt-Pt90Rh10 thermocouple. The accuracy of measurement was around ±10 C, controlled by the melting point of gold and silver. Experiments were performed in a He atmosphere. The rate of heating was varied as a function of the rate of transformation in the inclusions and ranged from 2 to 40 C/min to the point of complete homogenization of MI, i.e., disappearance of bubbles. Pilot runs were carried out in order to define the correct heating/step procedure before the starting of thermometric data collection. Vapor loss can be excluded due to the reproducibility of experiments on the same MI. The whole data set is available from the authors upon request. DR Figure Captions Fig DR1 Schematic map of the Campi Flegrei area (Rosi et al., 1999, modified). Location of the outcrops sampled in this work (see Appendix 1): plinian fallout: AF = Aquafidia; ignimbrite: MG=Mondragone, CS=Caserta; lithic-rich breccia: PR= Procida Island, MP= Monte di Procida, TF= Trefola quarry, SA= S. Arpino). Fig. DR2 Concentrations of water dissolved as molecules of H 2 O (open symbols) and as OH (filled symbols) as function of total water content in upper (sample PCF0035, circles) and lower (sample PCF0033, triangles) fallout deposits. Fig. DR3 Sulfur v. H 2 O content of MI. The S content is unrelated to the H 2 O content.

4 Marianelli et al., Fig. DR Volturno River ITALY 41 20' Roccamonfina Rome Calore River MG CS 41 N AF Campi Flegrei caldera MP PR TF SA Vesuvius Napoli Procida I ' Ischia I. Salerno 14 E Capri I. 20 Km 15 E

5 wt% molecular H2O and OH wt% H2O tot

6

7 Table DR1 Selected SEM-EDS analyses of K-feldspar and plagioclase in CI products K-feldspar Eruptive unit plinian fall plinian fall plinian fall plinian fall ignimbrite ignimbrite lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia Pumice sample PCF0033 PCF0033 PCF0035 PCF0035 PCF0032 PCF0032 BM001 BM001 PCF0010* PCF005 PCF005 K-fds1 core K-fds1 rim K-fds1 core K-fds1 rim K-fds1 core K-fds1 rim k-fds1core k-fds1rim K-fds1 unzoned K-fds1core k-fds1rim SiO Al 2 O FeO CaO Na 2 O K 2 O BaO <ld An Ab Or plagioclase Eruptive unit plinian fall plinian fall plinian fall plinian fall ignimbrite ignimbrite lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia Pumice sample PCF0035 PCF0035 PCF0035 PCF0035 PCF0032 PCF0032 PCF005 PCF005 BM001 BM001 plg1core plg1rim plg5 core plg5rim plg7core plg7rim plg1core plg1rim plg1core plg1rim SiO Al 2 O FeO CaO Na 2 O K 2 O An Ab Or SEM-EDS microanalysis was carried out on individual minerals using a Philips XL30 EDAX Genesis apparatus. Operating conditions were 20 kv and about 0.1 na beam current. The analyses were normalized to 100 wt% due to the EDAX software used.all Fe as FeO. dl= detection limit; nd= not determined; *= K-feldspar crystal clusters.

8 Table DR2 Selected SEM-EDS analyses of clinopyroxenes of CI products Eruptive unit plinian fall plinian fall plinian fall plinian fall ignimbrite ignimbrite lithic-rich breccialithic-rich breccialithic-rich breccialithic-rich breccialithic-rich breccialithic-rich breccia Pumice sample PCF0033 PCF0033 PCF0035 PCF0035 PCF0032 PCF0032 BM001 BM001 PCF001 PCF001 BM001 BM001 cpx1core cpx1rim cpx1core cpx1rim cpx6core cpx6rim cpx1core cpx1rim cpx2core cpx2rim cpx3core cpx3rim SiO TiO Al 2 O FeO MnO MgO CaO Na 2 O Cr 2 O 3 <dl <dl 0.25 <dl <dl <dl <dl <dl Wo En Fs Mg* SEM-EDS microanalysis was carried out on individual minerals using a Philips XL30 EDAX Genesis apparatus. Operating conditions were 20 kv and about 0.1 na beam current. The analyses were normalized to 100 wt% due to the EDAX software used.mg*= Mg/(Mg+Fetot); All Fe as FeO. Clinopyroxene structural formula have been calculated following Papike (1987). dl= detection limit.

9 Table DR3 Representative analysis of CI whole rocks Eruptive unit plinian fall plinian fall ignimbrite lithic-rich breccia lithic-rich breccia lithic-rich breccia Pumice sample PCF0033 PCF0035 PCF0032 PCF005 PCF0010 PCF001 SiO TiO Al 2 O Fe 2 O MnO MgO CaO Na 2 O K 2 O P 2 O Bulk rock samples were analyzed by XRF.

10 Table DR Selected SEM-EDS analyses of groundmass of CI products Eruptive unit plinian fall plinian fall ignimbrite ignimbrite lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia Pumice sample PCF0033 PCF0035 PCF0031 PCF0032 BM001 PCF005 PCF009 BM002 PCF001 n=30 σ n=25 σ n=25 σ n=26 σ n=25 σ n=20 σ n=25 σ n=5 σ n=24 σ SiO TiO Al 2 O FeO MnO MgO CaO Na 2 O K 2 O P 2 O nd nd nd nd nd nd Cl S nd nd nd nd nd nd Each analysis represents the average of n analyses made on a single pumice for the groundmass. σ = standard deviation All Fe as FeO. SEM-EDS microanalysis was carried out on matrix glasses using a Philips XL30 EDAX Genesis apparatus. Operating conditions were 20 kv and about 0.1 na beam current. A raster area of about 100 µm2 was employed for glass analysis to reduce the light element loss. The analyses were normalized to 100 wt% due to the EDAX software used

11 Table DR5 Selected SEM-EDS analyses of glass inclusions from CI pumices Eruptive unit plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall plinian fall Pumice sample PCF0033 PCF0033 PCF0033 PCF0033 PCF0033 PCF0033 PCF0033 PCF0035 PCF0035 PCF0035 PCF0035 SiO TiO Al 2 O FeO MnO MgO CaO Na 2 O K 2 O P 2 O <dl 0.03 <dl <dl 0.04 Cl S Eruptive unit ignimbrite ignimbrite ignimbrite lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich breccia lithic-rich brec Pumice sample PCF0032 PCF0032 PCF0032 BM001 BM001 BM001 BM001 BM001 BM001 PCF0025 PCF0025 SiO TiO Al 2 O FeO MnO MgO CaO Na 2 O K 2 O P 2 O <dl 0.02 <dl 0.09 <dl 0.05 Cl nd nd nd S nd nd nd Each analyses represents the average of at least 3 analyses on a single melt inclusion. All Fe as FeO. dl = detection limit. nd= not determined. SEM-EDS microanalysis was carried out on MIs in phenocrysts using a Philips XL30 EDAX Genesis apparatus. Operating conditions were 20 kv and about 0.1 na beam current. A raster area of about 100 µm2 was employed for glass analysis to reduce the light element loss. The analyses were normalized to 100 wt% due to the EDAX software used.

12 Table DR6 Selected FT-IR data on MI. Eruptive unit Pumice sample spessore (µm) ABS H2O (3500cm -1 ) H 2 O wt% ABS H2O (5200cm -1 ) H 2 O mol 5200 wt% ABS OH (4500cm - plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF plinian fall PCF ignimbrite PCF ignimbrite PCF ignimbrite PCF Only analyses for which water speciation data are available are reported here. The whole data set of H2O tot of MI is available upon request. The analythical procedure is described in Appendix 1

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