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Chemical analysis of scaly fabric : subduction zone deformation structures from the Shimanto Belt, Japan

Author
Taylor, Jennifer
Published
[University Park, Pennsylvania] : Pennsylvania State University, 2017.
Physical Description
1 electronic document
Additional Creators
Fisher, Donald and Schreyer Honors College
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Open Access.
Summary
Scaly fabrics in rocks from accretionary prisms provide insight into mechanical processes occurring in subduction fault zones. Nonetheless, the extent to which chemical processes contribute to the formation of scaly fabrics, and how these processes may vary with depth, has been poorly studied to date. Mlange shales from two different paleo-depths in the ancient subduction fault zones of the Shimanto Belt, Japan, were analyzed by electron microprobe to determine chemical differences between the host rock and shear zones. Structural and mineralogical differences were observed between samples from different paleo-depths. Shear zones in all samples were found to be depleted in silica, while quartz veins may provide a mass balance to silica loss. Silica dissolution and precipitation may contribute to the development of shear zones and scaly fabrics in subducted sediments from the accretionary prism. This process is a potential mechanism for frictional healing of the subduction fault zone, with implications for earthquake mechanics.
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Dissertation Note
B.S. Pennsylvania State University, 2017.
Technical Details
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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