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000000089 0247_ $$a10.7936/q6bb-3786$$2DOI
000000089 037__ $$aRDM
000000089 041__ $$aeng
000000089 245__ $$aExperimental Results of Nanoindentation in Granitic Feldspar and Quartz
000000089 269__ $$a2021-11-02
000000089 270__ $$mmsly@wustl.edu$$pSly, Michael
000000089 300__ $$a205.5 MB
000000089 336__ $$aDataset
000000089 520__ $$aThe deformation of the Earth’s continental crust depends largely on the mechanical properties of quartz and feldspar, including both brittle and ductile mechanisms. However, viscoplastic deformation of these mineral phases is difficult to achieve in laboratory experiments at temperatures relevant to the upper crust without high confining pressures to suppress microcracking and brittle fracture. In this study we use instrumented nanoindentation to determine the plastic yield strength of quartz, and orthoclase and plagioclase feldspars at temperatures of 23 – 500 °C and at strain rates of ~10-2 s-1. The specimen investigated here is a medium-grained granite from southwestern Rhode Island, grains of which were characterized and oriented using scanning electron microscopy and electron backscatter diffraction (EBSD). Indentation hardness and modulus of oriented grains was measured directly using a diamond Berkovich nanoindenter; these quantities were then used to calculate yield stresses through several existing theoretical and numerical models. The calculated yield stresses are fit to constitutive flow laws for low-temperature plasticity. We find that at these deformation conditions yield stresses are significantly lower than the stresses predicted by the extrapolation of previous flow laws from higher temperatures. We also find that, in contrast to most observations from nature, quartz is systematically stronger than both feldspars.
000000089 536__ $$c1726165$$oNational Science Foundation Division of Earth Sciences$$qhttps://ror.org/05v01mk25$$1https://nsf.gov/awardsearch/showAward?AWD_ID=1726165
000000089 540__ $$aCreative Commons Attribution (CC BY) 4.0 International$$uhttps://creativecommons.org/licenses/by/4.0/
000000089 650__ $$aEarth and related environmental sciences
000000089 6531_ $$afeldspar
000000089 6531_ $$aquartz
000000089 6531_ $$agranite
000000089 6531_ $$ananoindentatoin
000000089 6531_ $$ayield stress
000000089 6531_ $$aflow law
000000089 655__ $$aTabular
000000089 7001_ $$aSly, Michael$$uWashington University in St. Louis$$4https://ror.org/01yc7t268$$5ROR
000000089 7001_ $$aPadilla, Katharine$$uWashington University in St. Louis$$4https://ror.org/01yc7t268$$5ROR
000000089 7001_ $$aFlores, Katharine$$1https://orcid.org/0000-0002-5853-0878$$uWashington University in St. Louis$$4https://ror.org/01yc7t268$$5ROR
000000089 7001_ $$aSkemer, Philip$$1https://orcid.org/0000-0002-6702-1098$$uWashington University in St. Louis$$4https://ror.org/01yc7t268$$5ROR
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000000089 904__ $$akatharinepadilla@wustl.edu
000000089 904__ $$afloresk@wustl.edu
000000089 904__ $$apskemer@wustl.edu
000000089 909CO $$ooai:data.library.wustl.edu:89$$pdataset
000000089 980__ $$aWashU Researcher Data