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 7 of 7 for “"Mafic lower crust"”.
-
Towards using seismic anisotropy to interpret ductile deformation in mafic lower crust
The lower crust forms an important geodynamic control in continental tectonics and the communication and coupling of kinematics between surface and deep-Earth processes. An understanding of the relationship between seismic properties, finite strain and fabric orientation thus provides a useful tool …
-
Deformation Mechanisms and Strain Localization in the Mafic Continental Lower Crust
The rheology and strength of the lower crust play a key role in lithosphere dynamics, influencing the orogenic cycle and how plate tectonics work. Despite their geological importance, the processes that cause weakening of the lower crust and strain localization are still poorly understood. Through …
-
Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
… a compositionally stratified continental crust characterized by a silicic upper crust and a mafic lower crust. This thesis explores outstanding questions associated with fractional crystallization through detailed field, petrological, and geochemical studies of the Dariv Igneous Complex in …
-
Chemical, isotopic, and temporal variations during crustal differentiation : insights from the Dariv Igneous Complex, Western Mongolia
… a compositionally stratified continental crust characterized by a silicic upper crust and a mafic lower crust. This thesis explores outstanding questions associated with fractional crystallization through detailed field, petrological, and geochemical studies of the Dariv Igneous Complex in …
-
Impact of accessory minerals on the distribution of trace elements in the continental crust: an integrated petrologic and phase equilibria modeling study of migmatites, The
Partial melting of the lower continental crust and subsequent melt emplacement at higher structural levels is an important crustal differential process that is predicted to produce an enriched granitic upper crust and depleted, more mafic lower crust. However, the common occurrence of accessory …
-
Crustal structure of rifted and convergent margins : the U.S. East Coast and Aleutian margins
… processes that create and modify continental crust occur at continental margins, but recently has the scientific community acquired the necessary intrumentation to image crustal structure across margins in detail. In this thesis we investigate the crustal structure across the U.S. East Coast …
-
Uranium-series isotope constraints on magma generation and differentiation in the central Oregon Cascades
… intra-arc extension is highly focused, young mafic volcanism is particularly abundant, and eruption of true rhyolite is unusually common also. This dissertation seeks to address the generation and differentiation of young (< 20 ka) magmas in the central Oregon Cascades through application of …