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Strain Localization Mechanisms in the Scituate Granite, Rhode Island

Krasner, Paul
http://rave.ohiolink.edu/etdc/view?acc_num=akron1497285708350254

Abstract Details

2017, Master of Science, University of Akron, Geology.
The Scituate Granite is a common crustal rock that is found in Rhode Island. This granite has undergone ductile deformation and strain localized forming several smallscale shear zones. Optical and SEM microscopy have been utilized to determine how these shear zones formed. The host rock surrounding these shear zones is composed of coarse (>3500 microns) porphyoclasts of quartz, microcline, and albite, and also biotite. Microstructures observed in these grains are porphyroclasts with rims made up of recrystallized grains, deformation lamellae, subgrain rotation of phases, and quartz grains that exhibit a sweeping undulatory extinction pattern consistent with deformation by dislocation creep. However, within the shear zone the recrystallized grains are much finer in size (~80 microns). Microstructures in the shear zone are mobile grain boundaries, pinned grains, lobate grain boundaries, and chessboard extinction of the quartz grains consistent with deformation by diffusion creep. Flow laws predict that the strength of the fine grained material within the shear zones is considerably weaker than the coarse grained material in the host rock. The low water content in quartz (~300 H/106Si) would imply that quartz is strong, however it is very weak at the conditions in the mid to lower continental crust. The presence of weak phases, phase reactions, grain boundary sliding, and a change of deformation mechanism from dislocation to diffusion creep enables the shear zone to form.
Caleb Holyoke, Dr. (Advisor)
Ira Sasowsky, Dr. (Committee Member)
John Senko, Dr. (Committee Member)
Geology
Geology, Structural Geology, Strain Localization, Shear Zones, Scituate Granite

Recommended Citations

Citations

  • Krasner, P. (2017). Strain Localization Mechanisms in the Scituate Granite, Rhode Island [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1497285708350254

    APA Style (7th edition)

  • Krasner, Paul. Strain Localization Mechanisms in the Scituate Granite, Rhode Island. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1497285708350254.

    MLA Style (8th edition)

  • Krasner, Paul. "Strain Localization Mechanisms in the Scituate Granite, Rhode Island." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1497285708350254

    Chicago Manual of Style (17th edition)

akron1497285708350254
469
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This open access ETD is published by University of Akron and OhioLINK.