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 19 of 19 for “"Melt Generation"”.
-
Hydrous melt generation in the Earth's mantle
… focuses on quantifying the role of H₂O in the generation and modification of mantle melts at shallow pressures in subduction zones. In the first and second chapters, two experimental studies are presented that investigate direct mantle melting and then subsequent reaction of deeper mantle melts …
-
Melt generation in the Earth's mantle at Convergent Plate Margins
… at subduction zones has a profound effect on the melting behavior of the Earth's mantle. Two experimental studies (Chapters 1 and 2) of the melting behavior of mantle peridotite demonstrate that the forefathers of arc magmas are formed at extremely low temperatures in the mantle wedge at …
-
Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges
… spreading centers and undergoes decompression melting. The melt segregates from the matrix and is focused to the rise axis, where it is eventually intruded and/or erupted to form the oceanic crust. This thesis combines surface observations with laboratory studies and geodynamic modeling to …
-
Modelling the controls on melt generation during continental extension and breakup
… of margin<br/>and mantle structure on the melt generated during continental extension and breakup.<br/>The central aim is to understand how melting affects the rifting of continents, especially<br/>in the North Atlantic. In order to understand the enigmatic melt production …
-
Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
-
A Geodynamic Investigation of Magma-Poor Rifting Processes and Melt Generation: A Case Study of the Malawi Rift and Rungwe Volcanic Province, East Africa
… 3 are focused on investigating the sources of melt beneath the Rungwe Volcanic Province (RVP), an anomalous volcanic center located at the northern tip of the Malawi Rift. In chapter 1, we use the lithospheric structure of the Malawi Rift derived from the World Gravity Model 2012 to constrain …
-
Experimental Constraints on Melting Processes in the Earth and Small Rocky Bodies
… bodies in the Solar System is determined by the melt generation and crystallization processes in their interiors. This thesis investigates large-scale igneous processes in the Earth, the Moon, and the Angrite Parent Body using a multidisciplinary approach that integrates high-pressure …
-
Geochemical Insights into Crustal Melting in the Bhutan Himalaya
Crustal melting and granitic intrusions are characteristics of many continental collision zones. The processes, sources and timing of melt generation in collision zones are critical to understanding crustal and tectonic evolution. In the Himalaya, multiple Oligocene-Miocene leucogranite bodies …
-
Mineral equilibria constraints on open-system melting and consequences of melt loss in metabasic rocks
… (a-x) relations for high T mineral and melt phases allows the processes of melt generation and segregation to be quantified using high-resolution mineral equilibria modelling for the first time. In this work, calculated Pressure-Temperature (P-T) and Temperature-Mol. % SiO₂ (T-MSiO₂) …
-
Petrological and rheological controls on volcanism to terrestrial planets
… petrology and geodynamic modeling, processes of melting under thick lithospheres on the Earth and the moon are investigated. Phase equilibrium experiments were carried out on Apollo 14B and 15C picritic glasses (Chapters 5 and 6) and on a Sierran high-potassium lava (Chapter 1). These, along with …
-
Crustal melting in the Himalayan orogen : field, geochemical and geochronological studies in the Everest region, Nepal
… timing and processes involved in leucogranite generation in the Everest region of the Himalayan orogen. Geochemical investigations focused on samples from three outcrops at different structural levels in the Himalayan metamorphic core where in situ crustal melting and multiple generations of …
-
Experimental studies of melting and crystallization processes in planetary interiors
Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's mantle, the Greenland ice sheet, and the Earth's crust. Experiments have been …
-
Quantifying Glacier-Derived Summer Runoff in Northwest Montana
… first attempt to quantify the volume of glacier meltwater entering local streams. We simulate glacier-melt generation during the summers of 2009 and 2010 using a modified temperature-index model that includes solar radiation as input. The model was calibrated with data from weather stations …
-
Quantifying Glacier-Derived Summer Runoff in Northwest Montana
… first attempt to quantify the volume of glacier meltwater entering local streams. We simulate glacier-melt generation during the summers of 2009 and 2010 using a modified temperature-index model that includes solar radiation as input. The model was calibrated with data from weather stations …
-
Experimental studies of melting and crystallization processes in planetary interiors
Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's mantle, the Greenland ice sheet, and the Earth's crust. Experiments have been …
-
Continental Magmatism and Dynamic Topography
… to calculate the depth and temperature of melt generation by inverse modelling. A sensitivity test of this modelling scheme is carried out. Lithospheric thickness and mantle temperature are independently determined from shear wave velocity models. Beneath western North America, a negative …
-
The thermal structure of collisional orogens – insights from the Grenville orogen in Canada and Scotland
… across the crustal section and show that melt generation was more modest than previously thought. A compilation of P–T data from across the orogen shows that the majority of analysed rocks recording syn- to post-collisional metamorphism (i.e. c. 1.1–1.0 Ga) yield temperatures of up to ~800 …
-
Dynamics of mantle plumes
… affect processes on a smaller scale, such as melt generation and transport and surface magmatism. When they reach the base of the lithosphere, they cause massive magmatism associated with the generation of large igneous provinces, and they can be related to mass extinction events (Wignall, …