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Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling

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Published/Copyright: January 7, 2016
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American Mineralogist
From the journal American Mineralogist Volume 92 Issue 8-9

Abstract

In the petrologic and geochemical study of volcanic rocks, microlites have become an important tool with which to determine magma decompression rate and ascent path prior to eruption. However, studies in experimental petrology and kinetic modeling indicate that growth of pre-existing phenocrysts will occur over a much wider range of decompression-induced undercoolings than microlite nucleation. Consequently, we have developed a method using secondary ion mass spectrometry (SIMS) depth profiling to measure geochemical trends recorded during the final stage of phenocryst growth.

To test and demonstrate the new method, we examined explosive and effusive eruptive products collected from Soufrière Hills volcano, Montserrat. Plagioclase feldspar crystals were removed from clasts of pyroclastic deposits. Phenocrysts were individually selected on the basis of euhedral morphology and a relatively homogeneous distribution of surface contamination, such as volcanic glass. Crystals were cleaned, embedded in In, and analyzed by SIMS in depth-profiling mode. We used an O2+ primary ion beam, which provides a faster sputtering rate than the typically utilized O- primary beam. A normal-incidence electron gun is used for charge compensation. Ten isotopes were examined over 2-10 h periods and the resulting crater depth was determined. Data show variable trends in An, K, and Fe that we interpret to represent late-stage physical variations within the magma prior to eruption. The continuous chronology of geochemical data obtained from the SIMS analyses presented here provide information with unprecedented (~0.1 μm) resolution, allowing researchers to determine physical conduit conditions during magma ascent from the chamber to eruption at the surface

Keywords: SIMS depth-profiling; plagioclase; phenocrysts; volcanic conduit; Montserrat
Received: 2006-9-30
Accepted: 2007-3-16
Published Online: 2016-1-7
Published in Print: 2007-8-1

© 2016 by Walter de Gruyter Berlin/Boston

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  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
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  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
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https://doi.org/10.2138/am.2007.2468
Keywords for this article
SIMS depth-profiling; plagioclase; phenocrysts; volcanic conduit; Montserrat

Articles in the same Issue

  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
  2. Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California: Evidences for the hydrothermal formation
  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
  4. Stress-induced redistribution of yttrium and heavy rare-earth elements (HREE) in garnet during high-grade polymetamorphism
  5. The role of volatile transport by diffusion and dispersion in driving biotite-forming reactions during regional metamorphism of the Gile Mountain Formation, Vermont
  6. Laser Raman microspectrometry of metamorphic quartz: A simple method for comparison of metamorphic pressures
  7. Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study
  8. Structural state of microcrystalline opals: A Raman spectroscopic study
  9. A Monte Carlo investigation of the thermodynamics of cation ordering in 2-3 spinels
  10. Modeling the plastic deformation of olivine by dislocation dynamics simulations
  11. Heat capacity of hydration in zeolites
  12. Imaging of dioctahedral 2:1 layers by high-resolution transmission electron microscopy (HRTEM): Possibility of recording the dehydroxylate
  13. Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling
  14. Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars
  15. Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas
  16. Microbial effects in promoting the smectite to illite reaction: Role of organic matter intercalated in the interlayer
  17. Microbial reduction of structural Fe3+ in nontronite by a thermophilic bacterium and its role in promoting the smectite to illite reaction
  18. Unique properties of lunar impact glass: Nanophase metallic Fe synthesis
  19. Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry
  20. Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature
  21. Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
  22. Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa
  23. Jarosite-hydronium jarosite solid-solution series with full iron site occupancy: Mineralogy and crystal chemistry
  24. Hydrogen bonded silanols in the 10 Å phase: Evidence from NMR spectroscopy
  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
  27. Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
  28. The crystal structure of meurigite
  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
  30. Letter. Novel 2:1 structure of phyllosilicates formed by annealing Fe3+, Mg-rich dioctahedral mica
  31. Letter. Experimental study of radium partitioning between anorthite and melt at 1 atm
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