TEXTURE, MICROSTRUCTURE, AND STRENGTH OF HEMATITE ORES EXPERIMENTALLY DEFORMED IN THE TEMPERATURE RANGE 600-1100 °C AND AT STRAIN RATES BETWEEN 10-4 AND 10-6S-1
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dc.contributor.author | Siemes H. | |
dc.contributor.author | Klingenberg B. | |
dc.contributor.author | Rybacki E. | |
dc.contributor.author | Naumann M. | |
dc.contributor.author | Schafer W. | |
dc.contributor.author | Jansen E. | |
dc.contributor.author | Rosiere C.A. | |
dc.date.accessioned | 2022-01-24T03:31:18Z | |
dc.date.available | 2022-01-24T03:31:18Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=1608225 | |
dc.identifier.citation | Journal of Structural Geology, 2003, 25, 9, 1371-1391 | |
dc.identifier.issn | 0191-8141 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34554 | |
dc.description.abstract | Polycrystalline hematite samples cored perpendicular and parallel to the foliation, i.e. perpendicular and parallel to a weak c-axis maximum, respectively, were deformed in triaxial compression experiments at confining pressures of 300 and 400 MPa, temperatures T between 600 and 1100 °C, and strain rates between 10-4 and 10-6s-1. The measured strength of hematite ranges from 890 to 67 MPa.The grain size of the main starting material is up to 175 μm. Grain boundaries are intensely serrated. At T=<800 °C the grain boundaries become increasingly lobate and the number of r-twins decreases. Dynamic recrystallization starts above 800 °C and a foam structure with grain sizes up to 150 μm develops at T=<900 °C.Neutron diffraction measurements show a distinct change of the preferred orientation (texture) in compression parallel to the foliation. Below 800 °C a {300}-maximum developed due to {a}<m> slip. At 800 and 900 °C a c-axis maximum evolved, probably due to (c)<a> slip. The original texture is preferentially preserved but with lower densities at T=<1000 °C, presumably caused by increasing diffusional flow processes. Perpendicular to the foliation only minor changes of the texture occurred.The experimentally determined textures allow a better understanding of the natural preferred orientation of hematite ores. The extrapolation of experimental strength data of hematite, quartz, and carbonates to geological conditions are compatible with field observations. | |
dc.subject | HEMATITE ORE | |
dc.subject | EXPERIMENTAL DEFORMATION | |
dc.subject | RECRYSTALLIZATION | |
dc.subject | TEXTURE | |
dc.subject | MICROSTRUCTURE | |
dc.subject | POWER LAW CREEP | |
dc.title | TEXTURE, MICROSTRUCTURE, AND STRENGTH OF HEMATITE ORES EXPERIMENTALLY DEFORMED IN THE TEMPERATURE RANGE 600-1100 °C AND AT STRAIN RATES BETWEEN 10-4 AND 10-6S-1 | |
dc.type | Статья |
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