Дисертації з теми "Magma emplacement"
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Roman, Alberto M. "Emplacement and Post-Emplacement Dynamics of Magma Reservoirs." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC179.
Повний текст джерелаThe evolved bulk composition of the continental crust suggests that a large mafic portion has been lost during the geological time. However, mafic and ultramafic bodies, such as the Bushveld complex, South Africa, and the Great Dyke Zimbabwe, have been preserved in the crust for billions of years. The implied question, then, is how mafic cumulates are lost and, more specifically, what is the long-term evolution of a magma reservoir, possibly including post-emplacement and post-crystallization processes. This work aims at this question with the following approach. First , we perform laboratory experiments with viscous fluids to investigate the instability associated to a buoyancy reversai and derive simple scaling laws governing the different dynamical regimes. Many mafic intrusions preserve flow structures, proving that they were affected by gravitational instabilities consistent with the regimes observed in the laboratory. In a second part, we investigate the physical conditions under which mafic intrusions become unstable using extensive numerical simulations which reproduce crustal flows. The mort important finding is that the main control on the instability is the emplacement depth. The results of this work thus suggests that many of the mafic intrusions we obsei:ve4today at the outcrop are the vestiges of much larger systems that became unstable. Consequently foundering and sinking of mafic cumulates through the crust may be a very common process in volcanic regions. This mechanism should shed light on the processes governing the formation and differentiation of the Barth crust
Plankell, Eric Thomas. "Magma emplacement models for the Jurassic Ferrar Dolerite Province, Antarctica /." Connect to resource, 1997. http://hdl.handle.net/1811/28549.
Повний текст джерелаEngland, Richard W. "The ascent and emplacement of granitic magma : the Northern Arran granite." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6609/.
Повний текст джерелаLiss, Dirk. "Emplacement processes and magma flow geometries of the Whin Sill complex." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403441.
Повний текст джерелаMcGowan, Ellen. "Magma emplacement and deformation in rhyolitic dykes : insight into magmatic outgassing." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/81586/.
Повний текст джерелаEmblin, S. R. "The Reinfjord ultramafic complex, Seiland province : emplacement history and magma chamber model." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355634.
Повний текст джерелаRisby, Olle. "Crystallization and Emplacement of the Monte Amarelo Dikes: Magma Storage Assessment on Fogo, Cape Verde Islands." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316988.
Повний текст джерелаVulkanön Fogo är en del av ögruppen Kap Verde i Atlanten. Ögruppen bildar en två delad arkipelag positionerad 500 km väster om det afrikanska fastlandet. Ön, tillika vulkanen Fogo har på senare tid varit en av de mest aktiva vulkanerna i världen med 10 utbrott under de senaste 250 åren. Ön byggdes upp av sköldvulkanen Monte Amarelo nådde 3500 m ö h innan delar av den kollapsade ned i Atlanten. Det massiva skredet som skedde mellan 86 och 124 tusen år sedan skapade högplatån Cha das Caldeiras samt den omringande klippsektionen Bordeira. Vi har samlat stenprover från de plutoniska bergarter som har trängt in sig i klippsektionen Bordeira. Målet med vår studie är att skapa en modell för hur magma lagringen fungerar under Fogo. Vi ämnar kartlägga magmalagringsdjupet med hjälp av kemiska variation i mineral som kan användas för att kartlägga kristalliseringstryck och temperatur som i t.ex. klinopyroxen. Vi är samtidigt intresserade av att veta vilka processer som sker i det magmatiska systemet och sambandet mellan vulkanska bergarter t.ex. lava och plutoniska bergarter. Tidigare studier av Fogos magmalagring har använt vulkaniska bergarter, som kristalliserar sig mellan 0.45 till 0.68 GPa när man undersökt kemin på kristallkanter av klinopyroxen. 20 prover har analyserats från Bordeiraklipporna och de innehåller låga kiselhalter, mellan 37 till 47% samt höga mängder alkaliska oxider så som kalium och natrium. Provernas mineralinnehåll består främst av större kristaller av silikatmineralen klinopyroxen ± olivin± fältspat ± främmande amfibolkristaller. De större kristallerna är omringande av en mikrokristallin grundmassa bestående av järn-titanoxider, apatit och fältspatoider. Klinopyroxen har en relativt stor kemisk variation, med Mg#37 till Mg#85, med ett medelvärde på Mg#71. Vi har även två olika sorter av fältspat, en grupp med ett kalciumrik rikt innehåll klassificeras som anortit, och en annan med ett kaliumrikt innehåll, som ortoklas. Vår analys av klinopyroxen-smälta har gett oss kristalliseringstryck som sträcker sig mellan 0.02 till 0.85 GPa med ett medelvärde på 0.47 GPa. Detta innebär att den dominerande processen i magmalagringssystemet är fraktionerad kristallisering då vi kan se ett linjärt avtagande för många ämnen när de jämförs mot magnesiumhalten. Vår magmalagringsmodell för vulkanen Fogo visar att klinopyroxenkrystallisering påbörjas i den litosfäriska manteln, mellan 15 och 28 km djup. Kristallisering av kanter på klinopyroxenkristaller samt mindre kristaller i grundmassan sker ytligare och visar på att det finns en eller flera magmalagringsnivåer i den oceaniska jordskorpan, mellan 9 till 12 km djup. Vulkaniska och plutoniska bergarter vittnar om ett delat magmasystem, vilket indikerar att skillnaden mellan de två bergarterna främst är tiden de befinner sig på respektive lagringsnivå. Vår strukturgeologiska data samt 3D modell visar att den intrusiva aktiviteten var primärt orienterad NV-SO, N-NO och O-Vriktning. Monte Amarelo-vulkanens skred och kollaps orsakades av intruderande gångar med en generell N-S orientering vilket ledde till ett skred på östsidan.
MICHAIL, Maria. "Emplacement of the Middle Triassic Monzoni Intrusive Complex (Dolomites, Italy): Insights from Analogue Models and Field Observations." Doctoral thesis, Università degli studi di Ferrara, 2018. http://hdl.handle.net/11392/2488199.
Повний текст джерелаLe Dolomiti formano la parte centro-orientale delle Alpi meridionali, nel Nord Italia. L’organizzazione stratigrafica dell'area dolomitica comprende principalmente terreni dal Permiano al Cretaceo, mentre è in gran parte dominata dalle magnifiche piattaforme carbonatiche triassiche e dai relativi bacini. L'area delle Dolomiti ha registrato numerosi eventi tettonici e magmatici, dal Permiano fino al Cretaceo. Durante la tettonica transtensionale del Triassico medio, associata a subsidenza differenziale, la parte sud-occidentale delle Dolomiti è stata soggetta a un evento tettonico-magmatico Ladinico (Medio Triassico) di breve durata, sviluppando una serie di rilevanti strutture magmatiche. I complessi intrusivi di Monzoni, Predazzo e Cima Pape sono situati nelle Dolomiti sud-occidentali e rappresentano le principali espressioni intrusive del magmatismo Ladinico. Questo progetto di dottorato offre nuove conoscenze sui meccanismi di messa in posto del Complesso Intrusivo dei Monzoni, combinando dati sul campo e modelli analogici su postazioni di magma. Il plutone dei Monzoni, che si trova parallelo alla Valle di San Pellegrino, appare allungato, con orientamento NE-SO, coprendo un'area di circa 4,0 km2. Le principali caratteristiche del plutone dei Monzoni, la forma allungata e l'affinità shoshonitica orogenica, suggeriscono una potenziale correlazione e controllo della messa in posto da parte di strutture trascorrenti ereditate o medio-triassiche. La generazione, l'ascesa e la messa in posto del plutone dei Monzoni e il suo rapporto con le strutture trascorrenti, sono ancora oggetto di dibattito. La mancanza di osservazioni dirette sul campo attribuite all'attività vulcano-tettonica, rende difficile la comprensione dei meccanismi di interazione tra faglie e magmatismo. Le mappe geologiche aggiornate basate sui nuovi dati di terreno, forniscono nuove informazioni sui limiti di intrusione controllati da faglie e sul modello deformativo delle formazioni incassanti e del plutone. Inoltre, indagini su anisotropia di suscettività magnetica (AMS) sull’intrusione dei Monzoni, rivelano la zonazione all'interno del plutone e indicano la presenza di un condotto di alimentazione principale nella parte nord-orientale dell'intrusione. Infine, la modellazione geologica 3D del complesso intrusivo dei Monzoni, coerente con i dati geologici, limita il volume del plutone a 4.35 km3 e offre una visione - semplificata dei rapporti tra plutone e rocce incassanti. Il Complesso Intrusive di Monzoni, grazie alla sua eccellente esposizione tridimensionale, è particolarmente adatto allo studio di sistemi vulcano-tettonici, permettendo anche l'applicazione e il confronto con modelli analogici. Durante questo progetto, sono stati condotti esperimenti di modellazione analogica di tipo sandbox, su lungo zone di taglio trascorrenti a scala crostale. Sono stati distinti due regimi tettonici, trascorrenza pura e transtensione, e tre relazioni temporali tra magmatismo e tettonica; intrusione pre-tettonica, sin-tettonica e post-tettonica. I risultati sperimentali mostrano che esiste una forte interazione tra le strutture tettoniche, in evoluzione o ereditate, ed il magmatismo e che le caratteristiche geometriche dei plutoni sperimentali rappresentano un buon indicatore per la classificazione dei plutoni, definendo i tempi e l'ambiente tettonico della messa in posto. La combinazione di tutte le metodologie applicate, suggerisce la messa in posto del plutone durante un regime tettonico transtensionale con due possibili scenari cinematici; una transtensione sinistra - direzione N70° o una transtensione destra lungo faglie N30°.
Wiegand, Miriam [Verfasser], and R. [Akademischer Betreuer] Greiling. "Magmatism and rifting at the South Atlantic margin: Magma transport and emplacement mechanisms of mafic dykes from magnetic studies / Miriam Wiegand ; Betreuer: R. Greiling." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/113116900X/34.
Повний текст джерелаBlacic, Tanya Marie. "Magma supply and storage in volcanic systems : shallow crustal emplacement processes and causes of the large axial high along the western Galápagos Spreading Center, and relation of earthquakes to tectonic and magmatic features near Lassen Peak, northern California /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Повний текст джерелаkavanagh, Janine Lynsey. "Ascent and emplacement of Kimerlite magmas." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528061.
Повний текст джерелаWei, Wei. "Characteristics of the late Mesozoic tectonic evolution of the South China block and geodynamic implications : Multi-approach study on the Qingyang-Jiuhua, Hengshan and Fujian coastal granitic massifs." Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-01058791.
Повний текст джерелаTang, Eng Hoo Joseph. "The Petrogenesis Of The Station Creek Igneous Complex And Associated Volcanics, Northern New England Orogen." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15902/1/Joseph_Tang_Thesis.pdf.
Повний текст джерелаTang, Eng Hoo Joseph. "The Petrogenesis Of The Station Creek Igneous Complex And Associated Volcanics, Northern New England Orogen." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15902/.
Повний текст джерелаLénat, Jean-François. "Structure et dynamique internes d'un volcan basaltique intraplaque oceanique : le piton de la fournaise (ile de la reunion)." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2E394.
Повний текст джерелаBurchardt, Steffi. "Mechanisms of magma emplacement in the upper crust." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B282-1.
Повний текст джерелаBurchardt, Steffi [Verfasser]. "Mechanisms of magma emplacement in the upper crust / vorgelegt von Steffi Burchardt." 2009. http://d-nb.info/1009513575/34.
Повний текст джерелаPluckhahn, D. "The Palmer Granite: geochronology, geochemistry and genesis." Thesis, 1993. http://hdl.handle.net/2440/87543.
Повний текст джерелаVarious igneous bodies have intruded the Palmer area throughout the Delamerian Orogeny. The earliest, the Rathjen Gneiss, intruded either before or during D1 which gave it the prominent foliation. D1 was also responsible for crenulations in migmatite veins throughout the area. These crenelated migmatite veins are in areas folded by D2 mesoscale folds. Some pegmatite veins are also folded by D2 folds. The Palmer Granite intruded during D2 as is seen by shearing in a semi-crystalline state and a tectonic foliation that has been folded. The ballooning of the granite during emplacement deforms the surrounding sediments and the pre-granite folds hence their axes lie parallel to the contact of the granite. The effect of the granite intruding during the deformation has lead to the axis of the D2 folds forming after the granite to have a degree of randomness about their axis. Migmatite grade was reached again after the intrusion of the granite causing melt veins to develop to disrupt the foliation. D3 formed a regional syncline of the area combined with some small scale folding within the granite, however a foliation did not form. The emplacement of the granite and some other igneous bodies throughout the area has been controlled by using the bedding plane of the Kanmantoo. The geochemical trends throughout the Palmer Granite is formed by two different groups fractionally crystallising zircon, amphibole and biotite. This results in a decrease of normally incompatible elements. The two groups form by one group from a homogeneous source and the other a heterogeneous source. The xenoliths crystallised from a mafic magma. The amphibolites form two groups according to their differentiation and genetic relationship. They both form by fractional crystallisation however U and Pb are decreasing cannot be explained by this. Another possible mechanism is liquid un-mixing. To tie all of the groups together a model of a mafic pluton that crystallises the xenoliths as a chilled margin. The mafic magma evolves some of the Palmer Granite whilst turbulently convecting hence homogenising the magma. A magma recharge forms the more evolved mafic and this forms more Palmer Granite which convects in a laminar fashion forming heterogeneities. Part of the mafics evolve enough to be caught up in the Palmer Granite and as it does not crystallise zircons all the fractional crystallisation of the Palmer Granite must have occurred in the mafic plution.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1993
Slagel, Matthew M. "Experimental melting of phlogopite-calcite assemblages : applications to the evolution and emplacement of silicocarbonatite magmas in the crust /." 1999. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:9943118.
Повний текст джерела