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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 21 to 30 of 2079 (0.031 seconds)Spelling suggestions: "subject:"plate"" "subject:"slate""
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Evolution of eclogite facies metamorphism in the St. Cyr klippe, Yukon-Tanana terrane, Yukon, CanadaPetrie, Meredith Blair 13 April 2016 (has links)
<p> The St. Cyr klippe hosts well preserved to variably retrogressed eclogites found as sub-meter to hundreds of meter scale lenses within quartzofeldspathic schists in the Yukon-Tanana terrane, Canadian Cordillera. The St. Cyr area consists of structurally imbricated, polydeformed, and polymetamorphosed units of continental arc and oceanic crust. The eclogite-bearing quartzofeldspathic schists form a 30 by 6 kilometer thick, northwest-striking, coherent package. The schists consist of metasediments and felsic intrusives that are intercalated on the tens of meter scale. The presence of phengite and Permian age zircon crystallized under eclogite facies metamorphic conditions indicates that the eclogite was metamorphosed <i>in situ</i> with its quartzofeldspathic host. </p><p> I investigated the metamorphic evolution of the eclogite-facies rocks in the St. Cyr klippe using isochemical phase equilibrium thermodynamic (pseudosection) modeling. I constructed <i>P-T</i> pseudosections in the system Na<sub>2</sub>O-K<sub>2</sub>O-CaO-FeO-O<sub>2</sub>-MnO-MgO-Al<sub>2</sub>O<sub> 3</sub>-SiO<sub>2</sub>-TiO<sub>2</sub>-H<sub>2</sub>O for the bulk-rock composition of an eclogite and a host metatonalite. In combination with petrology and mineral compositions, St. Cyr eclogites followed a five-stage clockwise <i> P-T</i> path. Peak pressure conditions for the eclogites and metatonalites reached up to 3.2 GPa, well within the coesite stability field, indicating the eclogites reached ultrahigh-pressure conditions. Decompression during exhumation occurred with a corresponding temperature increase. </p><p> SHRIMP-RG zircon dating shows that the protolith of the eclogites formed within the Yukon-Tanana terrane during early, continental arc activity, between 364 and 380 Ma, while the metatonalite protolith formed at approximately 334 Ma, during the Little Salmon Cycle of the Klinkit phase of Yukon-Tanana arc activity. Both the eclogites and the metatonalites were then subducted to mantle depths and metamorphosed to ultrahigh-pressure conditions during the late Permian, between 266 and 271 Ma. The results of our study suggest portions of the Yukon-Tanana terrane were subducted to high-pressure and ultrahigh-pressure conditions. This is the first report of ultrahigh-pressure metamorphism in the accreted terranes of the North American Cordillera. Petrological, geochemical, geochronological, and structural relationships link the eclogites at St. Cyr to other eclogite localities in Yukon, indicating the high-pressure assemblages form a larger lithotectonic unit within the Yukon-Tanana terrane.</p>
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Tectonic and geochemical studies in palaeozoic rocks from part of the Polish Sudetes, south west of WroclawSeston, Rosemary January 1999 (has links)
No description available.
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| 23 |
Electrophoretic studies on matrix vesicles from rabbit growth plate cartilage梁志衡, Leung, Chi-hang, Wilfred. January 1996 (has links)
published_or_final_version / Biochemistry / Master / Master of Philosophy
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| 24 |
Theoretical investigations of stress concentrations in carbon fibre reinforced plastic structuresWu, C. M. L. January 1986 (has links)
No description available.
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| 25 |
A gravity interpretation of the continental margin and Coastal Batholith, PeruHaederle, J. M. January 1987 (has links)
No description available.
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| 26 |
Models of structural processes at oceanic plate boundariesTuckwell, George William January 1997 (has links)
No description available.
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| 27 |
Enhanced heat transfer to endothermic reactions by catalytic combustion in small channelsBabovicÌ, Mileta January 2003 (has links)
No description available.
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| 28 |
Interpretation of a seismic survey of crustal structure in western Scotland and the HebridesTsoumakos, Petros E. January 1986 (has links)
No description available.
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| 29 |
Teleseismic studies of large submarine earthquakesHenry, Chris January 2002 (has links)
No description available.
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| 30 |
Intraplate primary & subsidiary basin formation & deformation : an example from central SyriaWood, Barry G. M. January 2001 (has links)
No description available.
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