Healed microcrack orientations in granite from Illinois borehole UPH-3 and their relationship to the rock's stress history |
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| Institution: | 1. Department of Geology, Brigham Young University, Provo, UT 84602 U.S.A.;2. Department of Geology and Geophysics, University of Wisconsin, Madison, WI 53706 U.S.A.;1. Physics Department, Faculty of Science, Al-Azhar University, Assiut 71452, Egypt;2. Chemistry Department, Faculty of Science, Al-Azhar University, Assiut, 71524, Egypt;3. Physics Department, Faculty of Science, Al-Azhar University, Girls Branch, Cairo, Egypt;1. Shell Petroleum Development Company, Port Harcourt, Nigeria;2. Memorial University of Newfoundland, St. John''s, Canada;1. Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, Bethesda, MD 20892, USA;2. Section on Directed Gene Transfer, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, Bethesda, MD 20892, USA |
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| Abstract: | Oriented granite cores from the Illinois borehole UPH-3 contain planes of secondary fluid inclusions, which represent healed microcracks. They record the orientation of a paleostress field, with the maximum stress in the horizontal plane oriented to the NNW about 90° from the present stress field orientation. These bubble planes probably formed while the granite was still quite warm (> 400° C) during initial cooling, uplift, and unroofing of the granite prior to deposition of younger overlying Cambrian sediments. The bubble planes have a much more uniform orientation than the open microcracks, which formed by stress-relief when the core was removed from the borehole. |
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