Journal
TECTONOPHYSICS
Volume 690, Issue -, Pages 190-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2016.05.001
Keywords
Calcite; Carbonate rocks; Crack-seal texture; Dolomite; Fracture; Porosity; Vein
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Funding
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-03ER15430]
- Industry Associates of the Fracture Research and Application Consortium
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In calcite and dolomite deposits in fractures, transmitted light and optical cathodoluminescence methods detect crack-seal texture in some fractures, but scanning electron microscope-based cathodoluminescence (SEM-CL) combined with secondary-electron images and element maps, reveals crack-seal and cement growth textures where previous SEM-CL imaging methods found massive or featureless deposits. In a range of fractured carbonate rocks, patterns and textures of calcite and dolomite cements precipitated during and after fracture growth resemble complex accumulation patterns found in quartz in sandstone fractures, suggesting that some apparent differences between carbonate mineral and quartz deposits in fractures reflect the limits of previous imaging methods. Advances in delineating textures in widespread carbonate mineral deposits in fractures provide evidence for growth and occlusion of fracture porosity. (C) 2016 Elsevier B.V. All rights reserved.
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