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Title: Heterogeneity of inelastic strain during creep of Carrara marble: Microscale strain measurement technique: MICROSCALE STRAIN MEASUREMENT TECHNIQUE
Authors:
;
Award ID(s):
1451022
Publication Date:
NSF-PAR ID:
10028813
Journal Name:
Journal of Geophysical Research: Solid Earth
Volume:
121
Issue:
8
Page Range or eLocation-ID:
5736 to 5760
ISSN:
2169-9313
Sponsoring Org:
National Science Foundation
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  1. Usually several deformation mechanisms interact to accommodate plastic deformation. Quantifying the contribution of each to the total strain is necessary to bridge the gaps from observations of microstructures, to geomechanical descriptions, to extrapolating from laboratory data to field observations. Here, we describe the experimental and computational techniques involved in microscale strain mapping (MSSM), which allows strain produced during high-pressure, high-temperature deformation experiments to be tracked with high resolution. MSSM relies on the analysis of the relative displacement of initially regularly spaced markers after deformation. We present two lithography techniques used to pattern rock substrates at different scales: photolithography and electron-beammore »lithography. Further, we discuss the challenges of applying the MSSM technique to samples used in high-temperature and high-pressure experiments. We applied the MSSM technique to a study of strain partitioning during creep of Carrara marble and grain boundary sliding in San Carlos olivine, synthetic forsterite, and Solnhofen limestone at a confining pressure, Pc, of 300 MPa and homologous temperatures, TTm, of 0.3 to 0.6. The MSSM technique works very well up to temperatures of 700 °C. The experimental developments described here show promising results for higher-temperature applications.« less