A5101769743- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Geological Studies and Exploration
- Marine and environmental studies
- Hydraulic Fracturing and Reservoir Analysis
- Archaeology and Natural History
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Geological Formations and Processes Exploration
- Paleontology and Stratigraphy of Fossils
- Geophysical and Geoelectrical Methods
- Weed Control and Herbicide Applications
- Leaf Properties and Growth Measurement
- Image Processing and 3D Reconstruction
- Geological and Geophysical Studies
- Botany and Geology in Latin America and Caribbean
- Archaeological Research and Protection
- Sunflower and Safflower Cultivation
- Mine drainage and remediation techniques
- Coal Properties and Utilization
Central Connecticut State University
2009-2024
Planetary Science Institute
1989-2004
University of Pittsburgh
1989-2004
Abstract Fracture pattern development has been a challenging area of research in the Earth sciences for more than 100 years. Much learned about spatial and temporal complexity inherent to these systems, but severe challenges remain. Future advances will require new approaches. Chemical processes play larger role opening‐mode fracture hitherto appreciated. This review examines relationships between mechanical geochemical that influence patterns recorded natural settings. For fractures formed...
Outcrops of the middle Eagle Ford Formation in south-central Texas reveal well-developed joint networks subhorizontal competent carbonate (chalk) beds and less well developed interlayered incompetent calcareous mudrock beds. Northeast-striking bed-perpendicular joints have longest trace lengths are abutted by northwest-striking joints. All observed terminate vertically Normal faults common but abundant than joints; dominantly dip north, northwest, or southeast; sets and, thus, predated...
Research Article| December 01, 1999 Fluid inclusion and stable isotope analyses of veins from the central Appalachian Valley Ridge province: Implications for regional synorogenic hydrologic structure fluid migration Mark A. Evans; Evans 1Department Geology Planetary Science, University Pittsburgh, Pennsylvania 15260 Search other works by this author on: GSW Google Scholar Denise Battles 2Department Geography, Georgia Southern University, Statesboro, 30460 Author Article Information...
Research Article| March 01, 1989 The structural geometry and evolution of foreland thrust systems, northern Virginia MARK A. EVANS 1Department Geology Planetary Science, University Pittsburgh, Pennsylvania 15260 Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Geological Society America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print 0016-7606 GSA Bulletin (1989) 101 (3): 339–354....
Mesostructures in subhorizontal thinly bedded calcareous mudstones of the Permian Bell Canyon Formation western Delaware Basin (Guadalupe Mountains foothills, west Texas) include vertical tectonic stylolites kinematically linked with low-angle thrust faults. Schmidt rebound is high (38–70) for all but a few beds, indicating competent rock. Competent beds exhibit contrasting behavior ranging from (i) no visible and numerous small-displacement (<1 cm) faults, to (ii) rare Thrust fault...
In the central Appalachians, fluid inclusion microthermometry and oxygen carbon stable isotope analysis vein minerals from Middle Devonian shale section show that conditions (pressure, temperature, composition) are constantly changing during deformation vary spatially across fold-thrust belt. The earliest fractures in region formed prior to folding, early Alleghenian orogeny as rocks were buried into oil generation window. They contain degraded hydrocarbon inclusions basinal brine...
During an earthquake, physical and chemical transformations lead to alteration formation of minerals in the gouge layer. Altered neoformed can be used as tracers some earthquake processes. In this study, we investigate pyrite magnetic within host Chinshui siltstone 16‐cm‐thick gouge. This hosts principal slip zone Chi‐Chi (M w 7.6, 1999). siltstone, framboids various sizes euhedral are observed. The mineral assemblage comprises stoichiometric magnetite, greigite, fine‐grained pyrrhotite....
SUMMARY Palaeomagnetic and geochemical studies on Devonian sedimentary rocks in the Valley Ridge province West Virginia indicate that hypothesized relationship between orogenic fluids remagnetization is not straightforward. The Helderberg Group, an aquitard, Oriskany Formation, a palaeoaquifer, both contain similar, synfolding late Palaeozoic chemical remanent magnetizations (CRMs) residing magnetite. results from Formation are consistent with by because unit contains evidence for migration...
Faults are commonly the largest fractures in a fracture network, forming backbone of permeability system low-permeability rocks. outcrops Austin Chalk — an important oil and gas reservoir south Texas, Louisiana, westernmost Mississippi exemplify deformation fluid histories subseismic-scale faults mechanically layered chalk-dominated strata. Exposures near-horizontal southwest Texas contain northwest- southeast-dipping normal with exposed heights meters to tens displacements centimeters...
Palaeomagnetic, rock magnetic, geochemical and strain studies of the Helderberg Group Tonoloway Formation in Valley Ridge province West Virginia were performed to test origin syntilting magnetizations mechanisms chemical remanent magnetization (CRM) acquisition. The for a connection between remagnetization was by comparing types levels with magnetic properties generally coarse-grained, thickly bedded thinly finer-grained Tonoloway. Standard tilt tests as well optimal differential untilting...
Field observations and structural analysis of a 50-m-wavelength gentle anticline document bed-parallel fibrous gypsum veins ("beef") calcite associated with contractional folding in the Boquillas Formation, east Langtry, west Texas. Gypsum beef bed-perpendicular fibers accommodated vertical extension 13% anticline, diminishing to 0% adjacent synclines. Bed-parallel 0–4% across structure, no clear correspondence vein distribution position. Homogenization temperatures from two-phase fluid...
Abstract Fluid inclusion microthermometry of synkinematic veins is used to estimate the maximum syntectonic load that was deposited on wedge top in central Appalachians (northeastern United States) during Alleghanian orogeny. The restored loads indicate two major depocenters orogeny: one above Broadtop synclinorium, with as much 7 km Pennsylvanian–Permian probably sourced by erosion rocks uplifted growing Blue Ridge massif and emplacement North Mountain thrust sheet; other Anthracite belt,...
Abstract Observations over the last few decades from a number of orogenic systems have highlighted possible importance tectonic exhumation, i.e., ductile thinning and normal faulting, in exhuming rocks once buried high-pressure conditions. Taiwan is one active orogens world where that experienced metamorphism (> 50 km) are exposed at Earth’s surface, providing natural laboratory for advancing our understanding exhumation processes. We integrate previously published studies orogen with new...