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 55 for “"Batholith"”.
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MULTISCALE GEOCHEMICAL STUDY OF THE CORNO ALTO COMPLEX (ADAMELLO BATHOLITH)
Granitoid batholiths are important end products of the Earth’s long-term compositional differentiation, representing either the addition of juvenile material to the crust or the reworking of older crustal components. The nature and composition of crustal granitoids significantly changed at the …
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Petrogenesis and thermal history of the Kunlun Batholith, Northern Tibet
… Plateau. Geochronological data from the Kunlun batholith defines three distinct periods of intrusion at 390 Ma, 250 Ma and 190 Ma. A model is presented whereby the Devonian intrusions are considered to be related to a collision event between the Kunlun and Tarim Terranes, which were part of …
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Conduction Plus Convection Heat Flow Modeling for the Linga Complex, Peruvian Coastal Batholith
… in the Ica-Pisco area of the Peruvian Coastal Batholith were studied using field work, petrography, geochemistry data, and computer modeling. Field work and petrography involved collecting samples for geochemical analysis and documenting widespread propylitic and potassic hydrothermal …
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LITHIUM ENRICHMENT IN ANATECTIC PEGMATITES: NEW INSIGHTS FROM THE THERMOMETAMORPHIC AUREOLE OF THE ADAMELLO BATHOLITH
… and directly linked to the Adamello batholith, clearly marking the lack of direct relationship existing between this magmatic intrusion and pegmatites featuring Li enrichment in its contact aureole. The data from this study shows that cordierite, or the absence of it, plays a key role …
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Compositional Diversity in Arcs: A Record of Magmatic Processes in the Peru Coastal Batholith, Ica
<p>Peruvian granitic plutons display evidence for crustal recycling and magma mixing. Evidence of physical and chemical processes operating during the formation of the Ica-Pisco complexes involves magma mixing and mingling as result of felsic and mafic interactions. Evidence of crustal recycling …
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Rare-earth distributions in some rocks and associated minerals of the batholith of southern California
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1963.
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The geochemistry of the Atlanta Lobe of the Idaho Batholith in the western United States, Cordillera
… granitoids of the Atlanta lobe of the Idaho batholith in the western United States cordillera have led to new. insights on the nature of the lower crust and have placed constraints on granitoid magma genesis during a transition from a compressional to an extensional regime. The Cretaceous …
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Timing and emplacement of the Philipsburg batholith, SW Montana, and a comparison of two magnetic fabric techniques
… flow to local structures in the Philipsburg Batholith, a Late Cretaceous intrusion that cross-cuts the Georgetown-Princeton Thrust in the Flint Creek Range of southwest Montana. Well defined, mostly subhorizontal AMS fabrics were measured from 119 sites in the Philipsburg Batholith. Areas …
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Petrogenesis of Mesoarchean high-K rocks in the Kaapvaal Craton: Investigating the Boesmanskop Alkaline Complex and Salisbury Kop batholith
… Alkaline Complex (BAC) and Salisbury Kop batholith (SB) are two contrasting units of the large ca. 3105 Ma Granodiorite-Monzogranite-Syenogranite (GMS) suite, situated on the eastern margin of the Kaapvaal Craton. The BAC consists of small intrusions at the southern end of the Barberton …
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Evaluation of Paleo-climate for the Boise Area, Idaho, from the last Glacial Maximum to the Present Based on delta 2H and delta 18O Groundwater Composition
… Boise area, Idaho, U.S.A., identified as modern batholith, thermal batholith, Boise frontal fault, and Nampa-Caldwell systems (Figure 1). Modern batholith and thermal batholith groundwaters are located in Tertiary to Cretaceous aged granites and granodiorites of the Atlanta lobe of the Idaho …
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Geophysical investigations in the English Lake District
… form and evolution of the Lake District granite batholith and structures within the Skiddaw and Borrowdale Volcanic groups. <br></br><br></br>The modelling studies indicate that Lake District batholith may comprise up to nine separate deep-seated components, and there may be a further five high …
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Strain Analysis Across the Margins of the Elkahatchee and Coley Creek Plutons, Alabama Eastern Blue Ridge: Implications for the Alexander City Fault
… observed along the margin of the Elkahatchee batholith have been attributed to a major ductile shear zone associated with the Alexander City fault. This ductile shear zone, along the southeastern margin of the batholith where it borders Wedowee Group graphitic schist, is projected by some …
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Petrogenesis of Sierran plutons : a petrologic and geochemical investigation into the origin and differentiation of granodioritic plutons of the central Sierra Nevada batholith, California.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Paleogeography of Western North America: Insights from Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry
… North American Cordilleran arc: Coast Mountains batholith, North Cascades Range, Idaho batholith, Sierra Nevada batholith, Transverse Ranges, Peninsular Ranges, Sierra Madre Occidental, and the Porphyry Copper Province. Identifying changes in sediment provenance from Sevier thin-skinned thrusting …
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Pan-African magmatism and regional tectonics of South Brazil
… two major tectonic domains; the Pelotas Batholith and the Santana Metamorphic Belt, striking NNE-SSW parallel to the major foliation of the belts. The two belts are separated by a Triassic basin with flat lying red beds and interbedded andesites and rhyolites. The Santana Metamorphic Belt …
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Geology of the Ajax East and Ajax West, silica-saturated alkalic copper-gold porphyry deposits, Kamloops, South-Central British Columbia
… by the silica-saturated alkaline Iron Mask batholith, in the southern part of Quesnellia. The northwesterly trending batholith is an Early Jurassic composite intrusion emplaced in the Nicola Group, a well defined volcanic island arc package. Pit mapping delineated eleven significantly …
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