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.
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Showing 1 to 20 of 23 for “"EXTENSIONAL TECTONICS"”.
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Processes of extensional tectonics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982.
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Thermal-modelling of extensional tectonics
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1986.
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Style of volcanism and extensional tectonics in the eastern Basin and Range Province: Northern Mohave County, Arizona
… system marks the easternmost boundary of the extensional allochthon in the Basin and Range Province and the eastern limit of exposure of mid-Tertiary igneous rocks at the latitude of Lake Mead. The upper plate of this fault system is exposed only in the northern White Hills, Mohave County, …
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The roof of the cyclades : a structural, stratigraphic, and paleomagnetic study of Neogene extensional tectonics in Central Greece
… overall geometric and tectonic evolution of an extensional system that is largely governed by the dynamics of a retreating subducting slab. I document a newly-described low-angle normal fault, termed the Octonii Detachment, that accommodated NE-SW directed crustal extension and controlled the …
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Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen
… of mid-crustal plutons during Late Cretaceous extensional tectonics. U/Pb zircon and 40Ar/39Ar ornblende ages indicate intrusion, crystallization, and geologically instantaneous cooling through 500°C at ∼75 Ma. K-feldspar multi-diffusion domain modeling indicates a cooling rate gradient from …
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Tectonic implications of mantle source changes recorded by Eocene-Oligocene basalts from the Dillon volcanic field southwest Montana (USA)
… record the change from dominantly compression to extensional tectonics, within the northern Rocky Mountains and accordingly, also present across the North American Cordillera. The Dillon volcanic field is composed of lavas and intrusives that crop out across southwestern Montana, but most …
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U/Pb Zircon Ages of Plutons from the Central Appalachians and GIS-Based Assessment of Plutons with Comments on Their Regional Tectonic Significance
… are world-class examples of collisional and extensional tectonics, where multiple episodes of mountain building and rifting from the pre-Cambrian to the present are preserved in the geologic record. These orogenic events produced plutonic rocks, which can be used as probes of the thermal …
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Receiver function studies of crustal structure, composition, and evolution beneath the Afar Depression, Ethiopia
… beneath the Afar Depression in Ethiopia where extensional tectonics dominates. In this study, measurements of crustal thickness (H), crustal mean Vp/Vs [which is related to Poisson's ratio (Σ)], and the sharpness of the Moho (R) were determined using teleseismic data from 18 broadband seismic …
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Using 3D geodynamic slab models in tectonic reconstruction
… this thesis, two regions of convergent Cenozoic tectonics are investigated, and recent subduction is reconstructed using 3D models that map the surface of subducted slabs in the mantle. In Iran, the subduction of the Neotethys ocean prior to the collision of the Arabian continent with Eurasia is …
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Using 3D geodynamic slab models in tectonic reconstruction
… this thesis, two regions of convergent Cenozoic tectonics are investigated, and recent subduction is reconstructed using 3D models that map the surface of subducted slabs in the mantle. In Iran, the subduction of the Neotethys ocean prior to the collision of the Arabian continent with Eurasia is …
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Geology of the Tierras Blancas Area in the Southeastern Acambay Graben, Central Mexico
… Pliocene-Pleistocene sediments, and intra-arc extensional tectonics caused basin subsidence. Blockage of stream drainages by lava flows or perhaps increased basin subsidence contributed to the appearance of and fluctuations in the lacustrine system during the late Pliocene. Diatom assemblages …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
… the complex interactions between contemporaneous tectonics and magmatism. Determining the age of the EFDS at LTP, and the LTP pluton into which the dikes are emplaced, further constrains the timing of regional extensional tectonics during the Eocene. Classifying variations in lithology and …
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PETROLOGY, GEOCHEMISTRY, AND AGE OF EXTENSION IN THE LOST TRAIL PASS DIKE SWARM, SOUTHWEST MONTANA
… the complex interactions between contemporaneous tectonics and magmatism. Determining the age of the EFDS at LTP, and the LTP pluton into which the dikes are emplaced, further constrains the timing of regional extensional tectonics during the Eocene. Classifying variations in lithology and …
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A model of the crust and upper mantle structure of the Hellenic and Cyprus subduction zones constrained by gravity and seismic data
… induced by upwelling hot asthenosphere and extensional tectonics related to the Southwest retreating Hellenic trench and westward movement of the Anatolian micro plate. The magmatic centers and high geothermal gradients in the Menderes Massif Complex are indicative of an upwelling …
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Geochemistry, Thermochronometry, Petrogenesis, and Geometry of Igneous Dikes in Central Arkansas: Implications for Mississippi Embayment Evolution
… (MVG) and serves as a natural laboratory for extensional tectonics. The Arkansas Alkaline Province (AAP) lies along the ME’s western border in central Arkansas and was emplaced in the mid-Cretaceous Period as a suite of intrusive bodies. The relationship between the ME and AAP, and a mechanism …
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INTEGRATING SEDIMENTOLOGY, STRATIGRAPHY, GEOCHEMISTRY AND 3D GEOLOGICAL MODELLING: CONTRIBUTION TO GEOLOGICAL MAPPING FOR LAND KNOWLEDGE (CARG SHEET 081 ¿ROVERETO¿)
… a platform-scale erosional surface. Subsequent extensional tectonics caused platform subsidence at depths still above the effective wave base, which evolved into a submerged current swept paleostructural high. The relative sea-level rise and the consequent marine transgression resulted in the …
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Geochemistry and origin of the Asimotrypes carbonate hosted mesothermal gold deposit, Pangeon mountain, N. Greece
… Pangeon Mt and it was ascribed to Late Cainozoic extensional tectonics.<br/><br/>The Asimotrypes ore, of replacement and shear-zone style consists mainly of arsenopyrite, pyrite and gold, with subordinate sphalerite, galena, chalcopyrite, pyrrhotite, tetrahedrite-tennantite, marcasite, covellite …
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Plio-pleistocene tectonic evolution of Southern Sardinia
… the kinematic related to the Plio-Pleistocene tectonics in southern Sardinia, although tectonic activity during the latest million years is long since known in the Island. Then, the general aim of this research is to improve the understanding of the recent geological evolution of the southern …
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Characterization of a blind geothermal prospect through LiDAR analysis and shallow temperature survey, Gabbs Valley, Nye and Mineral Co., NV
… WNW-ESE extension in the Basin and Range. The tectonics at the prospect site were investigated using Quaternary fault mapping from LiDAR and low sun-angle aerial photos. Reconnaissance geochemistry from a spring seep on a Holocene fault scarp, and a two-meter temperature survey were used to …
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Large-scale hydrothermal dolomitisation in the southwestern Cantabrian Zone (NW Spain) : causes and controls of the process and origin of the dolomitising fluids
… during the Early Permian, when predominantly extensional tectonics followed the main Variscan compression. During this period the Cantabrian Zone underwent crustal thinning, possibly accompanied by increased heat flow from the basement. Shallow water sedimentation in semiarid climatic …
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