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Showing 1 to 13 of 13 for “"pluton emplacement"”.
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Pluton emplacement, aureole deformation and metamorphism, and regional deformation within the central White-Inyo Range, Eastern California
… rocks which has been intruded by granitic plutons associated with the Mesozoic Sierra Nevada intrusive suites to the west. My dissertation involves a characterization of the pre-plutonic regional deformation within the central White-Inyo Range and an understanding of the deformation of the …
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Proterozoic thermal and deformational history and geochemical evolution of the 1.4 Ga Priest pluton and its aureole
… in the aureole of the 1.43 +/- 0.01 ga Priest pluton provide evidence for a polyphase Proterozoic metamorphic history in central New Mexico. This history involved pre-, syn-, and post-emplacement metamorphic mineral growth. The Priest pluton contact aureole is 1.2 kilometers wide and is …
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Spatially controlled Fe isotope variations at Torres Del Paine
… complex in southern Chile. The multi-composition pluton consists of a 1.5 km vertical exposure of homogenous granite overlying a contemporaneous and possibly cogenetic 0.5 km mafic gabbro suite. This first-of-its-kind spatially dependent Fe isotope investigation of a convergent margin related …
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Origin and geological significance of mylonitic shear zones, northern Lucy Gray Range, Clark County, Nevada
The Beer Bottle Pass pluton, at the northern end of the Lucy Gray Range, Nevada, is part of a continent-scale belt of 1.4 Ga intrusive rocks that extend from California to Labrador. These granites are conventionally interpreted as anorogenic; however, recent work has documented that some of these …
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Investigation of iron isotope variability in the bimodal Aztec Wash Pluton, Eldorado Mountains, Nevada
… of the past decade, our understanding of silicic plutons has undergone a fundamental shift, from envisioning pluton emplacement as one large magmatic intrusion to the concept of incremental emplacement, in which plutons form from multiple smaller injections of magma over hundreds of thousands to …
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Aspects of the structure, tectonic evolution and sedimentation of the Tygerberg terrane, southwestern Cape Province
… preparation and sedimentary data representation. Emplacement of the Cape Peninsula granite pluton led to significant tectonic shortening of the sediments, tightening of the pre-existing synclinal fold at Sea Point, and overprinting of the structure by a regional foliation. Strain determinations …
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Geologic and tectonic evolution of the Manzano Peak Quadrangle, central New Mexico
… (southward by current day coordinates). Regional plutonism occurred during accretion (ca. 1.65 Ga) and also in the Mesoproterozoic between 1.45 and 1.35 Ga; both sets of plutons intrude the older Proterozoic rocks. Within the Manzano Mountains, it is controversial whether the present fabrics and …
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The Proterozoic ancestry of the Colorado Mineral Belt : ca. 1.4 Ga shear zone system in central Colorado
… field studies of relative timing of shearing and pluton emplacement, demonstrate a ca. 100 Ma history of recurrent shearing. This history involves movement at 1.45 Ga along Idaho Springs-Ralston shear zones and possibly along Homestake shear zone, synchronous with emplacement of the Mt. Evans …
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⁴⁰Ar/³⁹Ar and U-Pb geochronological constraints on the thermal and tectonic evolution of the Connemara Caledonides, Western Ireland
… resetting or alteration related to post-orogenic pluton emplacement. This study shows that geochronologic data must be evaluated in the context of careful field mapping, structural and petrologic analysis. Geochronological data from Connemara suggest that arc magmatism related to the Grampian …
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On Ultra-High Temperature Metamorphism in the Mid-Lower Crust
… New York is a composite intrusion of six mafic plutons and contains pelitic xenoliths that experienced extensive interaction with Mg-rich basaltic melt. The complex is an excellent natural example of ultra-high temperature (UHT) metamorphic processes and country rock-magma interaction due to …
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Stratigraphic signatures of convergent orogenesis from the plate interior : studies from Tibet and the southern Rocky Mountains
… drainage integration during Laramide thrusting, pluton emplacement in the San Juan mountains, and the transition to south-directed continental drainage systems that terminate in the Gulf of Mexico. Together, these studies provide a framework for understanding the co-evolution of sedimentary …
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Shearing on the Great Glen Fault: Kinematic and Microstructural Evidence Preserved at Different Crustal Levels
… displacing c. 425 Ma isotopically dated granitic plutons. Stewart et al. (2001) argued that dikes fed by these plutons were sinistrally sheared by the GGF while in the sub-magmatic state, suggesting continuous strike-slip motion on the GGF by 425 Ma. Strike-slip offset post-dating overlying …
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Emplacement of the Santa Rita Flat pluton and kinematic analysis of cross cutting shear zones, eastern California
… the deformation history of the Santa Rita Flat pluton, eastern California, from the time of emplacement to post-emplacement transpressional shearing, and consists of manuscripts that make up three chapters. The first chapter addresses the emplacement of the Santa Rita Flat pluton using …