Abstract
A section of borehole 210-020-RST1 was sampled and thin sections were cut in order to investigate the occurrence of microcracks within the borehole. The petrology of the sample was described and the presence of microcracks was noted. In total, 1894 microcracks were recorded during the investigation. Microcrack sets were defined on the basis of filling type (or lack of filling) and three-dimensional orientations attributed to the microcrack sets based on structural observations. Many microcrack sets are shown to have similar orientations to mesoscopic fractures observed within the Underground Research Laboratory (URL) lease area and within the URL subsurface. The relative age of observed microcracks, in terms of fillings, is from oldest to youngest: fluid-inclusion-filled fractures; unknown filled fractures; chlorite-filled fractures; and coeval in formation, chlorite-, hematite- and sericite-filled fractures. Fractures without filling are considered the youngest. Plates documenting some observed fractures are included. Biases in the generation and interpretation of the data are discussed and alternatives are mentioned. (auth)
Citation Formats
McGregor, R. G.
A preliminary investigation of microcracks in the overcored borehole 210-020-RST1, 240 level of the Underground Research Laboratory.
Canada: N. p.,
1992.
Web.
McGregor, R. G.
A preliminary investigation of microcracks in the overcored borehole 210-020-RST1, 240 level of the Underground Research Laboratory.
Canada.
McGregor, R. G.
1992.
"A preliminary investigation of microcracks in the overcored borehole 210-020-RST1, 240 level of the Underground Research Laboratory."
Canada.
@misc{etde_10156292,
title = {A preliminary investigation of microcracks in the overcored borehole 210-020-RST1, 240 level of the Underground Research Laboratory}
author = {McGregor, R. G.}
abstractNote = {A section of borehole 210-020-RST1 was sampled and thin sections were cut in order to investigate the occurrence of microcracks within the borehole. The petrology of the sample was described and the presence of microcracks was noted. In total, 1894 microcracks were recorded during the investigation. Microcrack sets were defined on the basis of filling type (or lack of filling) and three-dimensional orientations attributed to the microcrack sets based on structural observations. Many microcrack sets are shown to have similar orientations to mesoscopic fractures observed within the Underground Research Laboratory (URL) lease area and within the URL subsurface. The relative age of observed microcracks, in terms of fillings, is from oldest to youngest: fluid-inclusion-filled fractures; unknown filled fractures; chlorite-filled fractures; and coeval in formation, chlorite-, hematite- and sericite-filled fractures. Fractures without filling are considered the youngest. Plates documenting some observed fractures are included. Biases in the generation and interpretation of the data are discussed and alternatives are mentioned. (auth)}
place = {Canada}
year = {1992}
month = {May}
}
title = {A preliminary investigation of microcracks in the overcored borehole 210-020-RST1, 240 level of the Underground Research Laboratory}
author = {McGregor, R. G.}
abstractNote = {A section of borehole 210-020-RST1 was sampled and thin sections were cut in order to investigate the occurrence of microcracks within the borehole. The petrology of the sample was described and the presence of microcracks was noted. In total, 1894 microcracks were recorded during the investigation. Microcrack sets were defined on the basis of filling type (or lack of filling) and three-dimensional orientations attributed to the microcrack sets based on structural observations. Many microcrack sets are shown to have similar orientations to mesoscopic fractures observed within the Underground Research Laboratory (URL) lease area and within the URL subsurface. The relative age of observed microcracks, in terms of fillings, is from oldest to youngest: fluid-inclusion-filled fractures; unknown filled fractures; chlorite-filled fractures; and coeval in formation, chlorite-, hematite- and sericite-filled fractures. Fractures without filling are considered the youngest. Plates documenting some observed fractures are included. Biases in the generation and interpretation of the data are discussed and alternatives are mentioned. (auth)}
place = {Canada}
year = {1992}
month = {May}
}