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.

Appendix A Raw Electron Microprobe Data.xlsx (426 kB)
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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