期刊
SOLID EARTH
卷 9, 期 1, 页码 223-231出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/se-9-223-2018
关键词
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资金
- Department of Geology, University of Otago, New Zealand
- Rutherford Discovery Fellowship [RDF-UOO0612]
- University of Otago by GNS Science [C05X1702]
- Grants-in-Aid for Scientific Research [26109004] Funding Source: KAKEN
Graphitization, or the progressive maturation of carbonaceous material, is considered an irreversible process. Thus, the degree of graphite crystallinity, or its structural order, has been calibrated as an indicator of the peak metamorphic temperatures experienced by the host rocks. However, discrepancies between temperatures indicated by graphite crystallinity versus other thermometers have been documented in deformed rocks. To examine the possibility of mechanical modifications of graphite structure and the potential impacts on graphite thermometry, we performed laboratory deformation experiments. We sheared highly crystalline graphite powder at normal stresses of 5 and 25 megapascal (MPa) and aseismic velocities of 1, 10 and 100 mu m s(-1). The degree of structural order both in the starting and resulting materials was analyzed by Raman microspectroscopy. Our results demonstrate structural disorder of graphite, manifested as changes in the Raman spectra. Microstructural observations show that brittle processes caused the documented mechanical modifications of the aggregate graphite crystallinity. We conclude that the calibrated graphite thermometer is ambiguous in active tectonic settings.
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