Document Type
Thesis
Date of Degree Completion
Summer 2012
Degree Name
Master of Science (MS)
Department
Geological Sciences
Committee Chair
Wendy Bohrson
Second Committee Member
Chris Mattinson
Third Committee Member
Michael Rowe
Abstract
Documenting the physiochemical processes that influence magma composition is critical for forecasting eruption styles and managing volcanic hazards. Compositional diversity of magmas develops through recharge, assimilation, and fractional crystallization (RAFC) within subvolcanic magma reservoirs. Integration of MELTS modeling, whole rock, plagioclase textural and in situ elemental and isotopic data from Filicudi Island, Italy allow documentation of the roles and relative chronology that RAFC played in the magmatic evolution and elucidates aspects of the magma plumbing system structure.
Results indicate a polybaric magma plumbing system with deeper (3.5-4 kilobars) and shallower (0.5-1.2 kilobars) storage regions. Within the deeper system, FC acted to differentiate magma, while water contents acted to suppress plagioclase growth. Differentiated magma intruded to shallower levels, where plagioclase crystallized rapidly resulting in monotonous textures and high anorthite contents. Within the shallower system, recharge from the deeper system and continued FC contributed to the compositional diversity observed on Filicudi Island.
Recommended Citation
Harris, Michelle, "Documenting Magnatic Processes at Filicudi Island, Aeolian Arc, Italy: Integrating Quantitative Modeling and Plagioclase Textural and in situ Compositional Data" (2012). All Master's Theses. 1450.
https://digitalcommons.cwu.edu/etd/1450
Appendix A Raw Electron Microprobe Data
Appendix B Raw Trace Element Data.xlsx (375 kB)
Appendix B Raw Trace Element Data
Appendix C NDIC Images and Major-Trace Traverses.pdf (97889 kB)
Appendix C NDIC Images and Major-Trace Traverses
Appendix E NDIC Images and Major-87Sr-86Sr Traverse.pdf (96126 kB)
Appendix E NDIC Images and Major-87Sr-86Sr Traverse
Appendix F Petrology.pdf (712 kB)
Appendix F Petrology
Feb15_2012 Sr 1.xls (8944 kB)
Appendix D: Raw Sr Isotope Data 1
Feb15_2012 Sr 2.xls (9975 kB)
Appendix D: Raw Sr Isotope Data 2
Feb15_2012 Sr 2-1.xls (9650 kB)
Appendix D: Raw Sr Isotope Data 3
Feb16_2012 Sr 1.xls (9506 kB)
Appendix D: Raw Sr Isotope Data 4
Feb16_2012 Sr 2.xls (10636 kB)
Appendix D: Raw Sr Isotope Data 5
Feb16_2012 Sr 3.xls (4542 kB)
Appendix D: Raw Sr Isotope Data 6
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