02491nab a2200229 4500 20260520000317.0 260224s2014 xxu ing Inglés Deformation conditions for fracturing in the middle devonian sequence of the central Appalachians during the late paleozoic alleghnian orogeny nov. 2014 15/12/2014 ; 15/12/2014 36 p. ; 2263-2299 Transcripción del resumen del autor: In the central Appalachians, fluid inclusion microthermometry and oxygen and carbon stable isotope analysis vein minerals from the Middle Devonian shale section show that fluid conditions (pressure, temperature, and composition) are constantly changing during deformation and vary spatially across the fold-thrust belt. The earliest fractures in the region formed prior to folding, early during the Alleghenian orogeny as the rocks were buried into the oil generation window. They contain minerals that contain degraded hydrocarbon inclusions and basinal brine inclusions. During multiple vein reopening events, later mineral stages contain increasingly more mature hydrocarbon fluids. Late quartz mineralization is pervasive and typically contains the high-temperature brine inclusions. The vein opening history is related to changes in fluid connectivity associated with (1) burial by over-thrusting and/or syntectonic depositional loading and/or (2) folding during uplift and erosion. Initial fracture formation and fluid-trapping depths range from 3.5 km (2.2 mi) in the Plateau province and along the Appalachian structural front to 4.5 to 5.0 km (2.8 to 3.1 mi) in the Valley and Ridge province. Late-stage fracturing and fracture reopening is related to the maximum syntectonic burial, which varies from about 4 km (2.5 mi) in the Plateau to over 11 km (6.8 mi) in the Valley and Ridge. Fractures in the Valley and Ridge and western Pennsylvania Plateau provinces cannot be categorized into the simple BLTN13135eq1 and BLTN13135eq2 classification model. Burial history modeling indicates that fractures forming within and near the end of the oil window were NNW- and NW-striking, not ENE-striking, BLTN13135eq3 fractures. 11 AAPG Bulletin 98 ARTICULO Evans, Mark A. 54296 DeLisle, Amanda 54297 Leo, Jeremy 54298 Lafonte, Christopher J. 54299 188707 188707 0 0 0 0 256526 BAAB BAAB 2026-03-06 200060914 0 200060914 2026-03-06 00:18:47 2026-03-06 ARTICULO