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Experimental Deformation of O+ Oriented Synthetic Quartz Single Crystals

Poston, Edward J
http://rave.ohiolink.edu/etdc/view?acc_num=akron1491569717148234

Abstract Details

2017, Master of Science, University of Akron, Geology.
A Griggs rig apparatus was used to perform a number of strain rate stepping and pressure stepping experiments of O+ oriented synthetic quartz crystals. These samples were annealed at 1 atm and 900°C for 24 hours to convert the gel type water inclusions to free water inclusions similar to those that are found in natural milky quartz. Strain rate stepping experiments were performed at temperatures from 1000°C to 750°C, and strain rates from 1.6 X 10-4 s-1 to 1.6 X 10-6s-1, while confining pressure was held constant at 1.5 GPa. These samples were observed to yield over a range of <10 to ~300 MPa in many cases, though under some of the conditions tested samples did not yield. Two pressure stepping experiments were performed, one at 800°C and one at 750°C, with a strain rate of 1.6 X 10-6s-1 and confining pressures between 0.6 GPa and 1.5 GPa. The sample strengths measured in the pressure stepping experiments were between ~30 MPa and ~60 MPa. Microstructures observed within deformed samples include undulatory extinction and deformation lamellae. The mechanical data from those experiments that were consistent with dislocation creep fit the flow law: ε′=0.00177*CH2O1.9*fH2O* σdiff3.29* e(-268.6/(R*T)) Under natural conditions, this suggests plastic yielding of quartz occurs at ~9 km (~225°C) deep in the crust.
Caleb Holyoke, III (Advisor)
LaVerne Friberg (Committee Member)
John Peck (Committee Member)
76 p.
Geology; Geophysical; Geophysics
Quartz; rock deformation; flow law; deformation; mineral physics

Recommended Citations

Citations

  • Poston, E. J. (2017). Experimental Deformation of O+ Oriented Synthetic Quartz Single Crystals [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491569717148234

    APA Style (7th edition)

  • Poston, Edward. Experimental Deformation of O+ Oriented Synthetic Quartz Single Crystals. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1491569717148234.

    MLA Style (8th edition)

  • Poston, Edward. "Experimental Deformation of O+ Oriented Synthetic Quartz Single Crystals." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491569717148234

    Chicago Manual of Style (17th edition)

akron1491569717148234
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© 2017, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.