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 “"tectonic model"”.
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Tectonic model of the Malaŵi Rift, Africa
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1986.
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Re-evaluating the tectonic model for the Arbuckle Mountains, Oklahoma by spatial and geometric analysis of stratigraphic and structural trends
… features can allow for a more accurate tectonic timeline to be considered for not only the Arbuckle Mountains but for the assembly of modern North America. The Arbuckle Mountains in south central Oklahoma exhibit structurally complex stratigraphy associated with regional features like …
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Sedimentological constraints on Middle Miocene extensional tectonism of the southern Las Vegas Range, southern Nevada
A depositional-tectonic model is proposed for the reconstruction of a Miocene lacustrine basin in the southern Las Vegas Range, Nevada, that was fragmented during a period of extensional tectonism. The model suggests that the sediments were deposited in an isolated basin during initiation of normal …
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The Skiddaw Group of Cumbria : early Ordovician Turbidite sedimentation and provenance on an evolving microcontinental margin.
… collision in the Silurian. Three major tectonic events have been postulated in the earlier history of the microcontinent rifting from Gondwana, onset of subduction and subduction of the mid-ocean ridge. Evidence for such events may be sought in the contemporaneous sedimentary basins: …
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Pluton source varition over two magmatic pulses in the White-Inyo range, central-eastern California : implications for paleozoic and mesozoic tectonic reconstructions
… California, which is an important tectonic boundary as it is the easternmost extent of the Mesozoic Cordilleran arc and the western edge of Basin and Range extension. The main goal of this dissertation is to understand the lithospheric structure of this area in relation to the …
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Reconciling the structural and metamorphic record of orogeny in central western New Hampshire through microstructure and garnet isopleth thermobarometry
… within porphyroblast (FIA). Additionally, a tectonic model for central western New Hampshire is presented that explains several key geological features of the region that contradict many of the existing tectonic models.
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The Box Ankle and Ocmulgee shear zones of central Georgia: a study of geochemical response to Southern Appalachian deformation events
… data on the effects of Pb loss versus U gain models, dissolution processes, and overgrowth binary mixing models from within selected mylonitized bulk rock chemistries. In the Ocmulgee fault, zircon overgrowth associated with deformation dominates U/Pb age discordancy. Isotopic re-equilibration …
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Present day plate boundary deformation in the Caribbean and crustal deformation on southern Haiti
… use this velocity field as input to a kinematic model where surface velocities result from the rotation of rigid blocks bounded by locked faults accumulating inter- seismic strain, while allowing for partial locking along the Lesser Antilles, Puerto Rico, and Hispaniola subduction. This improved …
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Geology and Tectonic Significance of the Late Precambrian Eastern Blue Ridge Cover Sequence in Central Virginia
… cover sequence of the study area. The current tectonic models tend to view most of the mafic-ultramafic rocks and the host sedimentary rocks of the Lynchburg as ophiolitic melange, thus creating a suture, of Precambrian to Ordovician age. Detailed field mapping shows that the Lynchburg Group …
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Proterozoic Farwell Mountain-Lester Mountain suture zone, northern Colorado : subduction flip and progressive assembly of arcs
… as a northeast-trending belt of imbricated tectonic slivers between ca. 1.79-1.77 Ga Green Mountain rocks to the north and ca. 1.76-1.72 Ga rocks to the south. Marble, chert, mafic to ultramafic bodies, deformed pillow basalts, and sulfide deposits all outcrop along the zone and may …
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Bedrock geology of the seacoast region of New Hampshire, United States
… region of New Hampshire is underlain by two lithotectonic belts: the Rye Complex (RC), and the eastern portion of the Merrimack Group (MG). The Rye Formation and the Breakfast Hill member constitute the RC; the Kittery, Eliot, and Berwick Formations, the MG. The stratigraphic order interpreted in …
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Cenozoic stratigraphic and tectonic history of the Grenada and Tobago basins as determined from marine seismic data, wells, and onland geology
… thesis presents an integrated stratigraphic and tectonic evolution of the Grenada and Tobago basins using multi-channel seismic data collected in May, 2004, (BOLIVAR cruise), along with GULFREX seismic data collected by Gulf Oil Company in 1975. These reflection data, combined with UTIG OBS …
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Geodynamic Development of the South China Block from Precambrian to Cretaceous: Constraints from Geology Geochemistry and Geochronology
The geo-tectonic evolution of the South China block is subject to debate. Most articles tend to subdivide the South China block into two sub-ordinate blocks (Yangtze and Cathaysia), with a central Sibao (Jiangnan) Orogen, although there are also suggestions for a separate eastern (Tolo) block. …
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Mineralogical, chemical and isotopic diversity in plutonic rock suites from the Coastal Maine Magmatic Province:the role of source region heterogeneity, tectonic setting and magmatic processes
… rocks of the Coastal Maine Magmatic Province. A tectonic model is developed in which late Ordovician-Silurian bimodal magmatism is interpreted to reflect crustal melting as a result of intraplating of mantle melts at high crustal levels during a period of tension. Large scale melting of lower …
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Nature and Potential Origins of the Low-Rate Tectonics of the Hauraki Rift and North-Western New Zealand: A Geophysical Investigation
Little is known about the nature or origin of tectonic activity throughout north-western New Zealand, beyond that it is a stable environment (velocities ~1 mm/yr relative to Australia) and home to the Hauraki Rift, N-S trending, 250+ km long and 25 km wide on-shore/off-shore continental rift 40 km …
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THE TECTONIC EVOLUTION OF THE HATAY OPHIOLITE OF SOUTHEAST TURKEY
… eastern Mediterranean region and to produce a tectonic model for its evolution. The ophiolite comprises part of a prominent chain of southern Neotethyan ophiolites that stretches from the Troodos ophiolite of Cyprus eastwards to the Semail ophiolite of Oman. The Hatay ophiolite and the related …
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Cenozoic Sedimentary Evolution of the Helmville Basin, West-Central Montana
… contains. I also seek to test a rift shoulder tectonic model presented by Janecke (1994) for western Montana and Idaho by reconstructing the paleogeography of the Helmville basin and comparing those results against the model predictions. To accomplish these goals, I constructed a 1:24,000 scale …
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Cenozoic Sedimentary Evolution of the Helmville Basin, West-Central Montana
… contains. I also seek to test a rift shoulder tectonic model presented by Janecke (1994) for western Montana and Idaho by reconstructing the paleogeography of the Helmville basin and comparing those results against the model predictions. To accomplish these goals, I constructed a 1:24,000 scale …
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From the Appalachians to the Alps: Constraints on the Timing, Duration, and Conditions of Metamorphism at Convergent Margins
… inform our knowledge and understanding of plate tectonics. The characteristic timescales and length-scales of metamorphism vary by orders of magnitude, depending on the driving tectonic process. Two fundamental problems with the retrieval of this information from the metamorphic rock record are …
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