Hobro hookers, Fractures in these sandstones formed under different temperatures and in different structural settings, but similar but not identical quartzose composition and grain size simplify comparison of cement patterns.

Estibalitz Ukar, Stephen E. Laubach, Randall Marrett; Quartz c-axis orientation patterns in fracture cement as a measure of fracture opening rate and a validation tool for fracture pattern models. Geosphere ;; 12 2 : — We evaluate a published model for crystal growth patterns in quartz cement in sandstone fractures by comparing crystal fracture-spanning predictions to quartz c-axis orientation distributions measured by electron backscatter diffraction EBSD of spanning quartz deposits. Samples from eight subvertical opening-mode fractures in four sandstone formations, the Jurassic—Cretaceous Nikanassin Formation, northwestern Alberta Foothills CanadaCretaceous Mesaverde Horny pamela montreal USA; Cozzette Sandstone Member of the Iles FormationPiceance Basin, Colorado USAand upper Jurassic—lower Cretaceous Cotton Valley Group Taylor sandstone and overlying Travis Peak Formation, east Texas, have similar quartzose composition and grain size but contain fractures with different temperature histories and opening rates based on fluid inclusion assemblages and burial history.

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