Microscale and nanoscale strain mapping techniques applied to creep of rocks

Alejandra Quintanilla-Terminel, Mark E. Zimmerman, Brian Evans, David L. Kohlstedt

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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 highpressure, 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-beam 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 300MPa and homologous temperatures, T =Tm, 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.

Original languageEnglish (US)
Pages (from-to)751-765
Number of pages15
JournalSolid Earth
Volume8
Issue number4
DOIs
StatePublished - Jul 10 2017

Bibliographical note

Funding Information:
Support through NSF grants EAR-1520647 (UMN) and 145122 (MIT) is gratefully acknowledged.

Publisher Copyright:
© Author(s) 2017.

Fingerprint Dive into the research topics of 'Microscale and nanoscale strain mapping techniques applied to creep of rocks'. Together they form a unique fingerprint.

Cite this