Abstract
Magmatic conditions prior to explosive eruption are often investigated using geochemical signatures in glassy components of pyroclastic deposits and related to magmatic processes at depth. One important process is fractional crystallization, which causes systematic changes to the SiO2/Al2O3 ratio of the residual melt that can be determined by observation of the mineralogy of fully crystallized lavas, by experimental petrology, and by magmatic modeling. However, for many alkaline-mafic pyroclastic deposits, the record of residual melt compositions is obscured by alteration, commonly affecting more than 50% of pyroclastic rock components including reactive glass and some susceptible minerals. In this study, melt signatures of SiO2/Al2O3 represented heterogeneously by the scarce fresh glass and abundant, zeolitized proxy-glass in the alkaline deposits of a major, caldera-forming eruption were used in conjunction with a model system (Rhyolite-MELTS) to reconstruct residual melt compositions and characteristics that existed immediately prior to explosive eruption. Through the model, full major oxide compositions of residual melts and fractionally crystallizing minerals become accessible, with associated constraints on volatiles and physical characteristics (melt temperature, density, viscosity). The use of zeolitized proxy-glass signatures relies on established and deposit-specific evidence for “hydrologically closed” systems that suggests the SiO2/Al2O3 ratio is closely retained through initial alteration reactions and therefore closely representative of SiO2/Al2O3 in the precursor glass (erupted melt). The relationship is supported by a review of available, paired data (R2 = 0.94). Therefore, magmatic system data for the abundant and pervasive fine ash fraction of pyroclastic deposits can be investigated using this method and can progress more deeply beyond the widely used simple affiliation to igneous rock classification. Model-predicted magmatic mineral compositions (clinopyroxene, spinel, and nepheline as demonstrated here) serve to validate a case study reconstruction by comparison with compositions reported from natural and experimental samples. This predictive capability of the novel procedure is demonstrated in the case of a major caldera-forming eruption, the 355 ka Villa Senni event of the quiescent Colli Albani volcano, Rome, Italy, and its pervasively zeolitized Tufo Lionato deposit (>50 km3). The key finding is that a more-evolved residual melt fraction has been revealed, based on a reconstructed SiO2/Al2O3 ratio of 2.05 relative to that of the parent magma at 2.68, with implications for a reappraisal of pre-eruptive conditions and eruption mechanisms, and potentially for similar patterns across the volcanic stratigraphy and for other alkaline volcanoes.

Funding
Funding sources supporting the development of this work include NERC grant NE/L002418/1 (L.C. and D. Polya, Manchester University), the Erasmus Staff Training program (L.C.), a Junior Research Fellowship (Christ’s College Cambridge, M. S.), Indiana University (Bloomington) (D.B., L.C.), and the University of Milan (D.G., L.C.).
Acknowledgments
Field assistance and discussions with S. Conticelli (University of Florence) and several other members of the CARG team (Colli Albani Research Group), plus technical assistance with the microprobe analyses (A. Risplendente and J. Charnock), and loan of thin sections (G. Vignaroli and L. Melluso) are gratefully acknowledged. L.C. thanks A. Dyer, C.M.B. Henderson, and J. Blundy for open and supportive discussions relevant to this work. An earlier version of the manuscript benefitted from expert consideration and welcome suggestions by the editorial and reviewer teams.
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Articles in the same Issue
- Highlights and Breakthroughs
- Iron carbide in the core
- Reconstruction of residual melts from the zeolitized explosive products of alkaline-mafic volcanoes
- Inefficient high-temperature metamorphism in orthogneiss
- Nitrogen incorporation in silicates and metals: Results from SIMS, EPMA, FTIR, and laser-extraction mass spectrometry
- Activation of [100](001) slip system by water incorporation in olivine and the cause of seismic anisotropy decrease with depth in the asthenosphere
- In-situ high-temperature vibrational spectra for synthetic and natural clinohumite: Implications for dense hydrous magnesium silicates in subduction zones
- Stability of the hydrous phases of Al-rich phase D and Al-rich phase H in deep subducted oceanic crust
- Minerals in cement chemistry: A single-crystal neutron diffraction study of ettringite, Ca6Al2(SO4)3(OH)12·27H2O
- Nature of hydrogen defects in clinopyroxenes from room temperature up to 1000 °C: Implication for the preservation of hydrogen in the upper mantle and impact on electrical conductivity
- Phase transition boundary between fcc and hcp structures in Fe-Si alloy and its implications for terrestrial planetary cores
- Cathodoluminescence features, trace elements, and oxygen isotopes of quartz in unidirectional solidification textures from the Sn-mineralized Heemskirk Granite, western Tasmania
- Controls on cassiterite (SnO2) crystallization: Evidence from cathodoluminescence, trace-element chemistry, and geochronology at the Gejiu Tin District
- Anomalous elastic behavior of phase egg, AlSiO3(OH), at high pressures
- “Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of diamond formed by gas phase condensation or chemical vapor deposition
- An example of high-T, high-symmetry crystallization: Spherical (Mg,Fe)-oxides formed by particle attachment in the shocked martian meteorite Northwest Africa 7755
- Letter
- Zinc transport in hydrothermal fluids: On the roles of pressure and sulfur vs. chlorine complexing
- Book Review
- Book Review: Infrared and Raman Spectroscopies of Clay Minerals
Articles in the same Issue
- Highlights and Breakthroughs
- Iron carbide in the core
- Reconstruction of residual melts from the zeolitized explosive products of alkaline-mafic volcanoes
- Inefficient high-temperature metamorphism in orthogneiss
- Nitrogen incorporation in silicates and metals: Results from SIMS, EPMA, FTIR, and laser-extraction mass spectrometry
- Activation of [100](001) slip system by water incorporation in olivine and the cause of seismic anisotropy decrease with depth in the asthenosphere
- In-situ high-temperature vibrational spectra for synthetic and natural clinohumite: Implications for dense hydrous magnesium silicates in subduction zones
- Stability of the hydrous phases of Al-rich phase D and Al-rich phase H in deep subducted oceanic crust
- Minerals in cement chemistry: A single-crystal neutron diffraction study of ettringite, Ca6Al2(SO4)3(OH)12·27H2O
- Nature of hydrogen defects in clinopyroxenes from room temperature up to 1000 °C: Implication for the preservation of hydrogen in the upper mantle and impact on electrical conductivity
- Phase transition boundary between fcc and hcp structures in Fe-Si alloy and its implications for terrestrial planetary cores
- Cathodoluminescence features, trace elements, and oxygen isotopes of quartz in unidirectional solidification textures from the Sn-mineralized Heemskirk Granite, western Tasmania
- Controls on cassiterite (SnO2) crystallization: Evidence from cathodoluminescence, trace-element chemistry, and geochronology at the Gejiu Tin District
- Anomalous elastic behavior of phase egg, AlSiO3(OH), at high pressures
- “Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of diamond formed by gas phase condensation or chemical vapor deposition
- An example of high-T, high-symmetry crystallization: Spherical (Mg,Fe)-oxides formed by particle attachment in the shocked martian meteorite Northwest Africa 7755
- Letter
- Zinc transport in hydrothermal fluids: On the roles of pressure and sulfur vs. chlorine complexing
- Book Review
- Book Review: Infrared and Raman Spectroscopies of Clay Minerals