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 173 for “"orogenic"”.
-
The orogenic evolution of the Central Kyrgyz Tien Shan
… mountain belt has a distinctive morphology and orogenic evolution that is highly dependent on the unique distribution and geometries of inherited structures and other crustal weaknesses. In this thesis, I have investigated the complex and irregular Cenozoic orogenic evolution of the Central …
-
Tectonic and climatic controls on orogenic processes : the Northwest Himalaya, India
… Thus, tectonic processes can affect the entire orogenic system, while potential feedbacks between erosion and tectonics appear to be limited to the windward sides of an orogenic systems.
-
An analysis of pressure-temperature-time histories of eroding orogenic belts
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.
-
Evolution of continental crust in the Proterozoic : growth and reworking in orogenic systems
… on three different Palaeo- to Meso-Proterozoic orogenic belts; in Fennoscandia, in North American Grenville and in the Birimian terrane of the West African craton. The eastern part of the Sveconorwegian Province, located in the southwestern part of the Fennoscandian Shield, is made up of …
-
Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… In this dissertation the evolution of post-orogenic topography and the effect of glaciations on denuding landscapes along the North Atlantic Passive Margin, in the White Mountains of New Hampshire and the western Scottish Highlands, was investigated. Background exhumation rates averaged over …
-
Granite petrogenesis and crustal evolution studies in the Damara Pan-African orogenic belt, Namibia
Major and trace element data for Damara granitoids distinguish three geochemically distinct granitoid groups, - crustal-melt granitoids, calc-alkaline granitoids and within-plate granitoids. The overwhelming majority of the Oamara granitoids are peraluminous crustal-melt leucogranites which have …
-
Post-Orogenic Thermal History and Exhumation of the Northern Appalachian Basin: Low-Temperature Thermochronologic Constraints
… used to constrain the tectonic history of orogenic belts and the thermal history within sedimentary basins for hydrocarbon resource assessment. Collisional tectonics in the Paleozoic which formed of the Appalachian Orogen and the foreland basin has been a subject of considerable study. The …
-
Lithological and climatic controls on fluvial landscape evolution of a post-orogenic dryland mountain belt
Many mountain ranges in the world are in post-orogenic decay, a stage in which erosion is dominant over crustal thickening. The dominance of regional isostatic and mantle controls on rock uplift over localised fault uplift means climatic changes and intrinsic properties such as drainage capture and …
-
Tectonic and climatic forcing in orogenic processes : the foreland basin point of view, Alborz mountains, N Iran
Systeme von Vorlandbecken repräsentieren bedeutende geologische Archive und dienen dem Verständnis von Rückkopplungen zwischen oberflächennahen und tektonischen Prozessen. Außerdem dokumentieren sie die Entwicklung unmittelbar angrenzender Bergketten. Die sedimentären Abfolgen in Vorlandbecken …
-
The contact relationship between an large orogenic ultramafic massif and its surrounding units: Beni Bousera northern Morocco
Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2009.
-
A Thermochronological Investigation of Orogenic Architecture, Kinematics, and Tectonic-Climatic Interactions within the St. Elias Orogen, Alaska
The kinematics and architecture of orogenic systems may be heavily influenced by climate, but little research has focused on the long-term effects of glacial erosion on orogenesis. Low-temperature thermochronometry and subsidiary structural, earthquake relocation, and offshore seismic reflection …
-
Mineral Ridge: A Late Cretaceous Orogenic Gold System in the Miocene Silver Peak-Lone Mountain Metamorphic Core Complex
… to ~300°C. Mineral Ridge is interpreted as an orogenic gold system associated with a brittle-ductile shear that formed at depths as much as 11-20 km during the waning stages of Late Cretaceous Sevier contraction. Major exhumation occurred in the late Miocene in association with detachment and …
-
Behavior of Hybrid Thick- and Thin-Skinned Orogenic Wedges in the Western Interior USA and South-Central Andes
… convergence and the construction of Cordilleran orogenic systems. These systems are at dramatically different stages in their tectonic evolution, enabling a comparison of the actively forming Andes with their ancient counterpart in North America. Despite this advantageous geologic situation, …
-
Mineral, fluid and thermal evolution in veins from late orogenic coal basins of the Cantabrian Zone (Variscan, NW Spain)
The detailed study of syn-tectonic mineral veins and textural features of fluid inclusions is a useful approach for reconstructing the fluid and thermal evolution in diagenetic and very low-grade metamorphism environments. Here, mineralised fissures within the clastic sedimentary rocks of the …
-
The development of orogenic plateaus : Plateaus: case studies examining relationships between tectonics, crustal strength, surface deformation, and plateau morphology
… with the uplift, deformation, and erosion of orogenic plateaus. The timing and mechanisms of uplift of the Tibetan Plateau and the Altiplano are the subject of ongoing debate. Central issues include the strength of the lower crust and the role of lower crustal flow, the relative importance of …
-
The sedimentology and diagenesis of copper-bearing rocks of the southern margin of the Damaran Orogenic Belt, Namibia and Botswana
… outcrop on the southern foreland of the Damaran Orogenic Belt, and contain stratiform copper ore deposits. This thesis presents sedimentological, diagenetic and isotopic studies of these sediments, defines the controls on copper mineralization and presents a model for ore genesis. The …
-
Genesis and structure of the San Albino orogenic gold deposit, NW Nicaragua with implications for Mesozoic tectonic and metallogenic processes
… the genesis and tectonic framework for orogenic gold deposits is critical for guiding exploration vectoring and understanding the geometry of ore zones within these systems. Thus, structural investigations are needed to establish a holistic deformational framework encompassing the …
-
The structural geology of the Naukluft Nappe Complex and its relationship to the Damara Orogenic Belt, South West Africa/Namibia
… close to the southern margin of the Damara orogenic belt, it provides a key to the persistent controversy over the correlation of the "geosynclinal" Damara Supergroup with the Nama Group on the Kalahari craton. It also contains critical evidence bearing on the timing and large-scale …
-
Association of S-type and I-type granitoids in the Neoproterozoic Cameroon orogenic belt, Bafoussam area, West Cameroon : geology, geochemistry and petrogenesis
… is located within the Cameroon Neoproterozoic orogenic belt (north of the Congo craton) which is part of the Central African Fold Belt (CAFB).The evolution of the CAFB is related to the collision between the convergent West African craton, the São Francisco – Congo cratons and the Sahara …
-
Multi-stage orogenic gold mineralization of the Pine Lake greenstone belt: evidence from the Seabee Gold Operation, Trans-Hudson orogen, northern Saskatchewan
… and Santoy alteration minerals, typical of orogenic gold systems. Empirical geothermobarometric calculations of gold-associated vein-adjacent and vein-hosted chlorite and biotite exhibit orogenic-style formation conditions (~320-330 °C, 3 kbar, ~9 km depth). In conjunction with microprobe …
Page 1 of 9