Dissertations / Theses on the topic 'Island arc magmatism'
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Saunders, Katharine Emma. "Micro-analytical studies of the petrogenesis of silicic arc magmas in the Taupo Volcanic Zone and southern Kermadec Arc, New Zealand : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Doctor of Philosophy in Geology /." ResearchArchive@Victoria e-Thesis, 2009. http://hdl.handle.net/10063/943.
Full textMcCarron, Joseph John. "Evolution and tectonic implications of late Cretaceous - early Tertiary fore-arc magmatism : Alexander Island, Antarctica." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389878.
Full textTurnbull, Rose Elizabeth. "Mafic-Felsic interaction in a high level magma chamber - The Halfmoon Pluton, Stewart Island, New Zealand: Implications for understanding arc magmatism." Thesis, University of Canterbury. Geological Sciences, 2009. http://hdl.handle.net/10092/3503.
Full textBignold, Stella Mary. "The initiation and magmatic evolution of a juvenile island arc : the Kohistan arc, Pakistan Himalaya." Thesis, Kingston University, 2001. http://eprints.kingston.ac.uk/20671/.
Full textFinney, Benjamin Mark. "Magmatic differentiation at an island-arc caldera : a stratigraphically constrained multi-isotope study of Okmok Volcano, Aleutian Islands, Alaska." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417639.
Full textWainwright, Alan John. "Volcanostratigraphic framework and magmatic evolution of the Oyu Tolgoi porphyry Cu-Au district, South Mongolia." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2760.
Full textPaulson, Benjamin D. DeBari Susan M. "Magmatic processes in the Jurassic Bonanza arc : insights from the Alberni region of Vancouver Island, Canada /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=331&CISOBOX=1&REC=3.
Full textKraus, Stefan. "Magmatic dyke systems of the South Shetland Islands volcanic arc (West Antarctica) reflections of the geodynamic history /." Diss., [S.l.] : [s.n.], 2005. http://edoc.ub.uni-muenchen.de/archive/00003827/.
Full textMendoza, Talavera Oscar. "Les formations orogéniques mésozoiques du Guerrero (Mexique méridional) : contribution à la connaissance de l'évolution géodynamique des cordillères mexicaines." Grenoble 1, 1993. http://www.theses.fr/1993GRE10037.
Full textDesmet, Alain. "Ophiolites et séries basaltiques crétacées des régions caraïbes et nordandines : bassins marginaux, dorsales ou plateaux océaniques ?" Nancy 1, 1994. http://www.theses.fr/1994NAN10313.
Full textFackler-Adams, Benjamin Nickolas. "Volcanic and sedimentary facies, processes, and tectonics of intra-arc basins Jurassic continental arc of California and Cretaceous oceanic arc of Baja California /." 1997. http://catalog.hathitrust.org/api/volumes/oclc/40816898.html.
Full textRasmussen, Daniel J. "The Aleutian arc through and through: Subduction dynamics and the generation, storage, and eruption of hydrous magmas." Thesis, 2019. https://doi.org/10.7916/d8-vmrb-pf70.
Full textTurnbull, Rose E. "Mafic-felsic interaction in a high level magma chamber - the Halfmoon Pluton, Stewart Island, New Zealand : implications for understanding arc magmatism : a thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy in Geology at the University of Canterbury /." 2009. http://hdl.handle.net/10092/3503.
Full textMeegan, N. K. "The 1300AD dacite pumice eruption, Rinjani Volcano, East Sunda Arc: petrology, petrogenesis and plumbing." Thesis, 2009. http://hdl.handle.net/2440/129335.
Full textPhysical controls on fractional crystallisation in subduction settings around the globe are the focus of much discussion within academia. It is frequently observed that the typical magma to be erupted in arc settings is andesite from the differentiation of partially melted peridotite mantle wedge. It is less common in these settings to see more felsic end member magmas such as dacite or rhyolite being erupted in cataclysmic events. Discussion has arisen into what physical process or processes can drive a volcano, or set of volcanoes, within an arc to produce dacite or rhyolite magmas where fractional crystallisation is known to be the process of initial crystallisation. Research into these processes can be applied to Mount Rinjani (Lombok) within the Sunda Arc system, where the normally composite andesite volcano produced a cataclysmic eruption of dacite magma known as the Rinjani Pumice at 1300AD. Data is presented here in order to investigate processes within the sub-volcanic magma plumbing at Rinjani, primarily using volatiles from melt inclusions, coupled with petrology, pressure, temperature and water saturation estimates. It is theorised that ascent-driven crystallisation from a parent basalt drove fractional crystallisation to andesite composition beneath Rinjani volcano. Water undersaturated conditions induced ascent of the andesite magma to a shallow reservoir at ~3 kbar at temperatures ~1015 °C, with water saturation ~3.7 weight percent. Melt inclusion data from these same crystals reveals the interstitial liquid in the andesite magma to be of evolved dacite composition (~66 wt % SiO2) compared to the andesite (~50-54 wt % SiO2). Critical crystallinity is the physical process believed to have acted upon fractional crystallisation where the percentage of crystals forming exceeded the ability of the magma chamber to convect within this reservoir and therefore physical separation of the evolved dacite liquid from the andesite magma occurred. The buoyant dacitic liquid ascends to another shallow reservoir directly beneath Rinjani volcano and reaches its saturation pressure at 1.8 kbar at a temperature of ~900 °C, with water saturation increased to ~5 wt %. Sub-plinian cataclysmic eruption of the 1300AD Rinjani Pumice occurred due to pressure increase involved in saturation of the dacite, and syn-eruptive degassing aids in excavating the western flank of the Rinjani stratocone leaving a caldera. Subsequent volcanism occurs where the magma ascent path migrates west producing more cataclysmic eruptions increasing the volume of the edifice. Today, resurgent volcanism can be seen in the central eastern part of Segara Anak lake at Gunung Baru within the Rinjani caldera to produce basalt and andesite lavas. The application of physical mechanisms acting upon fractional crystallisation proposed here may be applied to other arc settings around the globe, where fractional crystallisation is found to be the primary driving force of felsic end member cataclysmic eruptions at what is typically an andesitic arc.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2009
Cox, G. M. "Jebel Tays ophiolitic thrust sheet, Saudi Arabia: tectonic setting, petrogenesis and geochronological framework." Thesis, 2009. http://hdl.handle.net/2440/128700.
Full textThe Arabian Nubian Shield (ANS) records multiple episodes of terrane amalgamation associated with the closure of the Mozambique Ocean and the amalgamation of Gondwana. Evidence for such amalgamation events are recorded by repeated ophiolite decorated sutures across the ANS. The Jebel Tays ophiolite is situated in the eastern portion of the ANS, within the Ad Dawadimi Basin and surrounded by the Abt Schist. This basin separates the Afif and Ar Rayn arc terranes and represents one of the last terrane amalgamation events affecting the exposed ANS. I identify mafic magmatism associated with Jebel Tays as a low titanium island arc tholeiite with forearc affinity (boninitic) in contrast to the island arc tholeiite magmatism of the nearby Halaban ophiolite. Furthermore, I place robust zircon ages on mafic magmatism of 678 ± 5.1 Ma for the gabbros of Jebel Tays and 674.4 ± 5.7 Ma for the Halaban ophiolite. Based on the stratigraphy and structure of Jebel Tays and the sub-greenschist nature of the thrust contacts I propose that Jebel Tays represents a forearc ophiolitic thrust sheet. Its obduction was associated with extensive serpentinite mud volcanism within a forearc environment associated with a west dipping subducting slab. From detrital zircons obtained from the Abt Formation I constrain deposition of the Ad Dawadimi basin sediments to ca 600 Ma, making them Ediacaran in age, a date that coincides with a new LA-ICP-MS monazite metamorphic age of 599.8 ± 5.8 Ma obtained from a trondhjemite that cross cuts the Jebel Tays body. This is in agreement with previously published 40Ar/39Ar ages which I interpret as metamorphism associated with final basin closure and the amalgamation of the Afif and Ar Rayn Terranes.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2009
Robinson, Frank Alexander. "Geochronological and geochemical constraints on the lithospheric evolution of the Arabian shield, Saudi Arabia: understanding plutonic rock petrogenesis in an accretionary orogen." Thesis, 2014. http://hdl.handle.net/2440/84674.
Full textThesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2014
Kraus, Stefan [Verfasser]. "Magmatic dyke systems of the South Shetland Islands volcanic arc (West Antarctica) : reflections of the geodynamic history / von Stefan Kraus." 2005. http://d-nb.info/975570803/34.
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