Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 150 for “"shear zone"”.
-
Fault Behavior and Kinematic Evolution of the Eastern California Shear Zone
… deformation history of the Eastern California shear zone (ECSZ), a wide and complex network of right-lateral strike-slip faults, is not well understood, despite hosting three large (>Mw 7.0) earthquake ruptures in recent decades. The low-net slip faults of the ECSZ (each with <10 km) offer a …
-
Structural study of the auriferous Santoy shear zone, northeastern Glennie domain, Saskatchewan
… 125 km northeast of LaRonge, SK. The Santoy shear zone hosts the Santoy 7, Santoy 8/8 East, and “Santoy Gap” gold deposits. This shear zone was studied using a structural and geochronological (ID-TIMS) approach in order to decipher its complex relationship with plutonism, deformation, …
-
Kinematics and timing of the Pinto shear zone, New York Mountains, northeastern Mojave Desert, California
New studies of the Pinto shear zone, New York Mountains, California, improve our understanding of the importance of Mesozoic extension in Mojave Desert and also contribute to the growing body of evidence for syncontractional extension in the Mesozoic Sevier orogen. The Pinto shear zone has a …
-
The Proterozoic ancestry of the Colorado Mineral Belt : ca. 1.4 Ga shear zone system in central Colorado
… higher-temperature Paleoproterozoic high strain zones of similar orientation. In this thesis, I distinguish the Colorado Mineral Belt itself from a Proterozoic 'Colorado Mineral Belt shear zone system' that includes the Homestake, Gore Range, St. Louis Lake, and Idaho Springs-Ralston shear zone …
-
Mechanisms of Shear Zone Localization and Raman Thermobarometry in Spinel Peridotites from the Alpine Fault, New Zealand
… suggests the presence of a narrow-localized shear zone within a zone of weaker deformation. Grain size reduction through brittle deformation would aid in the process of weakening and localization but depth constraints are required to properly interpret these and other microstructures.</p> <p> …
-
Geometry, kinematics and age of the northern half of the White Mountain shear zone, eastern California and Nevada
The White Mountain shear zone (WMSZ) is a zone of intense penetrative deformation that lies along the western front of the northern White-Inyo Range in eastern-most California and western-most Nevada. The northern half of the WMSZ is characterized by a NNE to NNW-striking steeply dipping foliation …
-
Earthquakes in complex fault settings: Examples from the Oregon Cascades, Eastern California Shear Zone, and San Andreas fault
… basin, strike-slip faulting within a wide shear zone, and creeping fault behavior all manifest differently and require a variety of techniques for analysis. In this dissertation I studied three different actively deforming regions across a variety of geologic settings. First, I explored the …
-
Quartz-kyanite pods in Proterozoic rocks in northern New Mexico : shear zone formation along an older hydrothermal alteration horizon
… are discontinuous, lenticular, symmetrically zoned, and are stratiform within a map-scale sericitic horizon. Previous studies have not resolved whether the high-Al bulk composition of the quartz-kyanite pods was the result of weathering, hydrothermal alteration, or shearing. Geochemical …
-
Geologic Mapping in the Black Mountain Area, Northern Eastern California Shear Zone: Testing a Kinematic and Geometric Fault Slip Transfer Model
… Black Mountain area, northern eastern California shear zone, are used to test a kinematic fault slip transfer model for the Owens Valley fault-Mina deflection transition. In the Black Mountain area, range bounding ~NNW- to ~NS-striking and lesser NW- to NE-striking normal faults cut Mesozoic, …
-
Polyphase tectonics and metamorphism and their relation to movement on the Monte Largo shear zone in the Manzano Mountains, central New Mexico
… Largo Canyon, which contains the Monte Largo shear zone, and rocks from Monte de Abajo Canyon ~3km south of the shear zone. These studies were done to help constrain the timing of the movement on the shear zone as well as to explain the deformation and metamorphism related to movement. From …
-
Analysis of the Cabin Canyon shear zone in the Virgin Mountains : implications for an early accretionary province boundary and later transpressional zone.
A newly discovered northeast-trending subvertical shear zone, up to 3 kilometers wide, forms the backbone of the Virgin Mountains in southern Nevada. This zone, named for excellent exposure in Cabin Canyon, contains a well-developed mylonitic foliation that records a complex history of movement and …
-
Proterozoic history of the Idaho Springs-Ralston shear zone: evidence for a widespread ca. 1.4 Ga orogenic event in central Colorado, The
The Idaho Springs-Ralston shear zone (IRSZ) is one of several Proterozoic NE-trending zones within the central-eastern Colorado Front Range. The zone is composed of multiple mylonitic strands of a few meters to several kilometers in width and is mapped from ~16 km NNW of Denver, CO to ~26 km to the …
-
I. Paleomagnetism and crustal rotations along a shear zone, Las Vegas range, Southern Nevada ; II. Seismotectonics of the Tien Shan, Central Asia
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1988.
-
Microstructural, geochronologic and thermochronologic evidence for both Paleo- and Mesoproterozoic displacement across the Gneiss Canyon shear zone : lower Granite Gorge, Grand Canyon, Arizona
The Gneiss Canyon shear zone (GCSZ) in north-western Arizona sits between high grade migmatites on the west and lower amphibolite grade schists on the east. This 13 km-wide zone, contains domains of intense D2 strain up to 100m wide that separate blocks of preserved northwest-striking D1 fabric. …
-
A coming together: The juxtaposition of the Rae and Hearne cratons along the Virgin River shear zone (Snowbird tectonic zone), Saskatchewan, Canada, and the implications for proto-Laurentia
The Snowbird tectonic zone of western Laurentia remains an enigmatic feature; some researchers have suggested that it represents a Paleoproterozoic suture, whereas others have proposed that it represents a reactivated Archean intracratonic fault zone. The Virgin River shear zone is the most …
-
The interaction between chemical and mechanical processes during metamorphism: a microstructural and petrologic study of amphibolite shear zones, Cheyenne Belt, Southeastern Wyoming
Shear zones which deform margins of amphibolite boudins in the Cheyenne Belt, SE Wyoming, record a full strain transition from relatively undeformed amphibolite which has relict igneous textures to mylonitic amphibolite with a strongly developed L-S tectonic fabric. The strain transition is marked …
-
The Day Nui Con Voi mylonitic belt in Southwestern China and Its implications for the early Cenozoic extrusion of Indochina
… from the Eastern Himalayan syntaxis, with large shear zones at their boundaries that could have accommodated displacements of hundreds to perhaps a thousand kilometers. Along the northeastern edge of the Indochina extruded fragment, the belt of mylonitic metamorphic rocks generally referred to as …
-
Structural and metamorphic evolution of a gneiss terrain in the Namaqua Belt near Onseepkans, South West Africa
… is represented by a northwest trending dextral shear zone - the Pofadder ZAHNCAFS. The zone of reorientation associated with this shear zone controls the geometry of the western part of the area. The shear zone varies in width from 20 to 40 km and the core contains a 2 km - 7 km wide belt of …
-
Structure and geochronological constraints on the ductile deformation observed along the Gaoligong Shan and Chong Shan Shear Zones, Yunnan (China)
… area within the India-Eurasia collision zone, a region known as the Three Rivers area, and presents the first structural and geochronological data from several transects across two poorly documented linear metamorphic belts located in between the Sagaing fault and the Ailao Shan Shear …
Page 1 of 8