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Publications (25)
Thin-skinned extension detached on salt is mostly well understood. Faults may dip basinward or landward (counterregional) and intersect the top salt or equivalent weld at cusps/rollers. The polarity of faulting may switch over time, and with sufficient extension, the oldest suprasalt strata separate into rafts with intervening younger depocenters....
This Special Publication is a celebration of research into the Folding and Fracturing of Rocks to mark the 50th anniversary of the publication of the seminal textbook by J. G. Ramsay. Folding and Fracturing of Rocks summarised the key structural geology concepts of the time. Through his numerical and geometric focus John pioneered and provided solu...
John G. Ramsay's book Folding and Fracturing of Rocks was first published in 1967. It set the research agenda for, and the approaches to, modern structural geology. It is recognized as one of the most influential texts in the subject area and was underpinned by significant research publications by the author; its weight added to by later texts and...
Outcropedia is an online public database sponsored by TecTask, the Commission on Tectonics and Structural Geology of the International Union of Geological Sciences (IUGS). The project was initiated by three structural geologists, Prof. Dr. C.W. Passchier, Prof. M. Jessell, and H. Lebit. The website was initially launched in 2010 under the outcroped...
Marine fold-and-thrust complexes form extensive belts along ocean basin slopes, and are associated
with prolific hydrocarbon provinces particularly in the Atlantic Basin, including the Gulf of Mexico
(figure 1). These systems have common boundary conditions as they are located along passive
continental margins sometimes with syn/post-rift evaporite...
The Cascades crystalline core forms part of the Cretaceous magmatic belt of western North America and exposes a crustal section composed of primarily tonalitic plutons that intruded siliciclas-tic metasediments of an arc-derived accretional system, and local meta-basalt/chert sequences. This study is the first attempt to correlate the well-understo...
The Tonga Formation, on the westernmost boundary of the Cascades crystalline core, records Cretaceous plutonism, contact to regional metamorphism, and multiple episodes of folding related to intense east-west contractional deformation. The Tonga Formation is exposed in a fault-bounded, north-south elongate tectonic domain that comprises pelite-psam...
The origin of broadly orogen-parallel (NW–SE) mineral lineations in Cretaceous and Paleogene arc plutons and amphibolite–facies metamorphic rocks (paleodepths of <10–40 km) of the North Cascades (Cascades core) is controversial, particularly the kinematic significance of these lineations and their relationship to regional displacement fields. Outcr...
Shear zones from the Piedmont Province in the Southern Appalachian Mountains have progressively modified a pre-existing fabric in biotite-hornblende gneisses. In the pre-deformed gneiss a sub-horizontal L-fabric of varying intensity is found. This fabric changes progressively to an S-fabric towards the center of the localized ductile shear zones. T...
The Martinsburg Formation at Lehigh Gap, Pennsylvania, undergoes a transition from shales to slates, reflecting local progressive deformation on an outcrop scale. The anisotropy of magnetic susceptibility (AMS) was measured in low and high fields. The high-field measurements show that the magnetic susceptibility is controlled by the paramagnetic mi...
Magnetic and mineral fabrics in slates reflect intensity of cleavage and the cleavage forming mechanisms and can therefore be used to determine regional deformation gradients. Slate samples have been analyzed in two study areas, in the low-grade Cambro-Ordovician sediments of SW-Sardinia and in the Martinsburg Formation at Lehigh Gap, PA in the cen...
Quartz fabric analyses along the basal thrust of the Dent Blanche nappe and in the footfall Pennine units indicate south directed thrusting for the last stage of Austro-alpine/Pennine nappe emplacement. Quartz fabrics—in particular, those from the Pennine Mischabel backfold—imply complex spatial and temporal texture developments with crystallograph...
Neutron texture analyses of quartz-bearing and quartz-free amphibolite mylonites from the Windy Pass thrust, Cascades Crystalline Core (Washington/USA) reveal pronounced textures of plagioclase and clino-amphiboles (hornblende, cummingtonite) but no preferred orientation of quartz. A reliable strategy for amphibolite fabric analysis is presented by...
Although some empirical relationships have been established between the anisotropy of magnetic susceptibility (AMS) and the state of finite strain in studies from specific geologic areas, the mechanisms governing correlations are not well understood. A comparative study has been made in order to elucidate the AMS-strain relationship by investigatin...
Structural investigations in the Variscan fold interference pattern of SW Sardinia (Italy) document an intriguing example of the relationship between cleavage, folding and finite strain. Although Palaeozoic sediments were affected by two major folding events, both under identical low-grade metamorphic conditions, only a single penetrative cleavage...
