Dissertations / Theses on the topic 'Arc Crust'
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Edwards, Caroline Marion Hawkey. "A comparison of arc evolution on continental and oceanic crust, Sunda Arc, Indonesia." Thesis, Royal Holloway, University of London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361452.
Full textMercer, Celestine Nicole. "Mineralogical indicators of magmatic and hydrothermal processes in continental arc crust /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2009. http://hdl.handle.net/1794/10250.
Full textMercer, Celestine Nicole 1979. "Mineralogical indicators of magmatic and hydrothermal processes in continental arc crust." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10250.
Full textThis dissertation explores several important consequences of H 2 O-rich fluids in magmatic and ore-forming systems within continental arc crust. North Sister, a stratovolcano in the Oregon High Cascades, provides a window into magma generation processes in the deep crust. Eruption of a remarkably limited basaltic andesite composition over the lifespan of this volcano may reflect last equilibration of mantle derived magma within a deep crustal hot zone. High pressure, water-undersaturated phase equilibrium experiments show that an anhydrous, augite-rich gabbro at ∼12 kbar (40 km depth) and ∼ 1175°C is the most probable lithology with which North Sister basaltic andesite with ∼3.5 wt% H 2 O last equilibrated within the deep crust before erupting. While magma often erupts at the planets surface as at North Sister, a greater volume never reaches the surface and solidifies within the upper crust. Exsolution of magmatic fluids is an inevitable consequence of crystallization of hydrous crustal magmas. The fate of these fluids is the focus of the remainder of this dissertation. Modeling of CO 2 and H 2 O variations during crystallization of granitic magma reveals that exsolution of a large mass of fluid occurs only after CO 2 is largely degassed, creating ideal conditions for hydrofracturing and formation of porphyry copper deposits. CO 2 and H 2 O solubility relations suggest that H 2 O-rich magma was required to produce the porphyry-Cu-Mo deposit at Butte, Montana, which may explain its distinctively deep generation. Electron microprobe analyses of Ti in quartz and Zr in rutile in samples from Butte yield porphyry magma temperatures (630-770°C) that overlap substantially with hydrothermal vein temperatures (<430-750°C). Veins display large temperature ranges (50-250°C) that signify variable degrees of cooling of hot magmatic fluids upon contact with cooler wall rock during vein growth. Modeling of Ti diffusion in quartz suggests that individual dikes and veins likely cooled over short timescales (10s-1000s years), indicating that porphyry systems may evolve by episodic magmatic fluid injections with discrete thermal spikes. Modeling of Ti diffusion in quartz combined with electron backscatter diffraction maps show that small hydrothermal quartz veins likely formed by epitaxial growth. This dissertation includes co-authored material both previously published and in preparation for submission.
Committee in charge: A. Dana Johnston, Chairperson, Geological Sciences; Mark Reed, Member, Geological Sciences; Paul Wallace, Member, Geological Sciences; Richard P. Taylor, Outside Member, Physics
Freymuth, Heye. "The role of the oceanic crust in the genesis of volcanic arc magmas." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.684749.
Full textAlvarado, Patricia Monica. "Crustal Seismicity in the Back-Arc Region of the Southern Central Andes from Historic to Modern Times." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195537.
Full textJolis, Ester M. "Magma-Crust Interaction at Subduction Zone Volcanoes." Doctoral thesis, Uppsala universitet, Berggrundsgeologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-198085.
Full textKlein, Benjamin Zachary. "Processes and rates of arc crust growth and differentiation in the Southern Sierra Nevada crustal section." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121759.
Full textCataloged from PDF version of thesis.
Includes bibliographical references.
This thesis presents a multidisciplinary investigation of the processes and timescales for the construction of arc crust, with a focus on the exposed crustal section in the southernmost Sierra Nevada Batholith, California. This section exposes plutons that were emplaced at pressures ranging from 3-10 kbars, as well as metamorphic wall rocks. Chapters 1 and 2 represent focused studies of the Bear Valley Intrusive Suite (BVIS), the dominant igneous component of the crustal section. Chapter 1 presents new magmatic structural data and whole rock geochemical data that highlight a discontinuity in the BVIS between a lower crust dominated by originally shallowly lying mafic cumulates and an upper crust dominated by steeply oriented felsic intrusives. These observations are used to constrain the thermal state of the arc during the emplacement of the BVIS. Chapter 2 is a high-precision CA-ID-TIMS U/Pb zircon geochronology study of the BVIS.
This study shows that the entire BVIS was emplaced within 1.1 million years, and thus represents the highest documented (intrusive) subduction zone magmatic flux. Chapter 3 focuses on the contribution of the metamorphic wall-rocks to the observed crustal section. Using detrital zircon geochronology, I argue that these wall-rocks preserve an inverted stratigraphy that is most easily explained if these sediments were first subducted and subsequently returned as relaminated material, which would make these materials the first in situ example of relaminated sediments. Chapters 4 and 5 present broader studies of subduction zone processes in space and time. In Chapter 4, I present a study based on a global compilation of modern arc lavas.
This study develops new proxies that use distinctive major element trends produced by fractionating magmas to qualitatively constrain the hydration state and initial fractionation pressure of differentiating magmas, and finds that magmas in continental arcs typically evolve at wetter and higher-pressure conditions compared to island arcs. Finally, Chapter 5 investigates the dynamics of subducted slabs through Earth's history and finds that, based on anticipated higher mantle temperatures and concomitant thicker, more mafic oceanic crust, subducted slabs in the Archean are unlikely to have stagnated within or immediately below the mantle transition zone.
by Benjamin Zachary Klein.
Ph. D. in Geology
Ph.D.inGeology Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences
Jones, Rosemary Ellen. "Subduction zone processes and continental crust formation in the southern Central Andes : insights from geochemistry and geochronology." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9672.
Full textPfänder, Jörg A. "Oceanic crust and island arc formation in Central Asia during late Neoproterozoic times evidence from petrological and geochemical studies /." [S.l.] : [s.n.], 2001. http://ArchiMeD.uni-mainz.de/pub/2002/0051/diss.pdf.
Full textMoyer, Griffin Amoss. "Strain Accommodation, Metamorphic Evolution, And 3d Kinematics Of Transpressional Flow Within The Lower Crust Of A Cretaceous Magmatic Arc In Fiordland, New Zealand." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1110.
Full textJohnson, Julie A. "A Geochemical Study of Crustal Plutonic Rocks from the Southern Mariana Trench Forearc: Relationship to Volcanic Rocks Erupted during Subduction Initiation." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1249.
Full textHolbik, Sven P. "Arc Crust-Magma Interaction in the Andean Southern Volcanic Zone from Thermobarometry, Mineral Composition, Radiogenic Isotope and Rare Earth Element Systematics of the Azufre-Planchon-Peteroa Volcanic Complex, Chile." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1524.
Full textRoell, Jennifer L. "Geochemical evidence for incremental emplacement of Palms pluton, southern California." Thesis, Connect to resource online, 2009. http://hdl.handle.net/1805/2061.
Full textTitle from screen (viewed on February 2, 2010). Department of Earth Sciences, Indiana University-Purdue University Indianapolis (IUPUI). Advisor(s): Andrew P. Barth, Gabriel M. Filippelli, Kathy Licht. Includes vitae. Includes bibliographical references (leaves 102-110).
Zelt, Colin Andrew. "Seismic structure of the crust and upper mantle in the Peace River Arch region." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29327.
Full textScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Desmet, 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 textLosa, Llabata Marta. "Gene regulation in embryonic development." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/gene-regulation-in-embryonic-development(8a9efb79-1ca9-409e-89b9-9d66213e593f).html.
Full textTurmina, Leonardo Balbinot. "O livre-arb?trio no pensamento de Tom?s de Aquino." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/5880.
Full textThis dissertation intends to investigates the arguments that the Saint and Doctor of the Roman Catholic Church, Thomas Aquinas introduces in his thinking concerning of free will and the way that he envisages the Divine Providence. It analyzes the development of these issues over the course of patristic, as well as some of the main ideas of the thinkers who were the pillars of the catholic saint. With reference to his magnum opus, the Summa Theologica, this dissertation looks for the dimension of free will that humans have in front of the divine will in many issues of his work.
A presente disserta??o procura investigar os argumentos que o santo e doutor da Igreja Cat?lica Apost?lica Romana, Tom?s de Aquino, apresenta no seu pensamento referente ao livre-arb?trio e como este encontra espa?o perante a Divina Provid?ncia. Para tanto, analisa-se o desenvolvimento dessas quest?es ao decorrer da patr?stica, bem como as principais ideias de alguns dos pensadores que foram pilares do pensamento do santo cat?lico. Tendo como refer?ncia sua obra m?xima, a Suma Teol?gica, a disserta??o procura em diversas quest?es da obra a dimens?o do livre-arb?trio que o ser humano possui perante a vontade divina.
Jeannolin, François. "Sédimentologie et hydrogéologie du néogène de l'Est valentinois et du bassin de Crest, Drome, France." Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb37594829z.
Full textWang, Jianhua. "Contribution à la connaissance sédimentologique des formations miocènes marines de deux bassins du sud-est de la France Sommières (Gard), Crest (Drôme) /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376017863.
Full textLarocque, Jeffrey Paul. "The role of amphibole in the evolution of arc magmas and crust: the case from the Jurassic Bonanza arc section, Vancouver Island, Canada." Thesis, 2008. http://hdl.handle.net/1828/1309.
Full textWang, Yu-Ju, and 王郁如. "Three dimensional S-wave attenuation model of the crust and uppermost mantle beneath arc-continent collision, Taiwan." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/32439179268305476460.
Full text國立中央大學
地球物理研究所
92
The S-wave attenuation structures (Qs) of Taiwan are imaged using the S-wave data from the dense deployed strong motion network of Taiwan. The image of 3-D Qs is essential in Taiwan because Qs is sensitivity to localized permeability and heterogeneity, which are important characters for interpreting active tectonic regions as Taiwan. The attenuation images of S-wave are obtained using t* values measured from S-wave spectra from Taiwan strong motion network for moderate size earthquakes (ML4.5-5.5) to avoid the source complexity. The time period used in this study is from 1993-1998. Over 2000 velocity spectra of S wave arrivals from 173 earthquakes were analyzed. A non-linear least square technique is applied to the spectra for t* by assuming a ��-2 model for the frequency band of 1-20Hz. A frequency-independent Qs was assumed in this study. Combined the existed three-dimensional S-wave velocity model, the three-dimensional Qs images were obtained. The Qs-tomography shows general consistent feature to geological structure. At shallow depth (4~9km), the Qs tomography separated the western Taiwan into high Qs and low Qs images to the north and south, respectively, along latitude of 23.5∘N. The low Qs image within southwestern Taiwan is related to its thicker sediment; while the high Qs image within northwestern Taiwan is related to the formation of foreland sequence. The image also reveals the variation across Longitudinal Valley, which is the suture zone of the arc-continent collision. At deeper depth, 27-38 km, a high Qs images extended from latitude of 24∘N to 25∘N, which is related to the subduting slab. A relative low Qs zone beneath the Central Range was found in the depths of 30-40 km. This low Qs zone is consistent with the low velocity zone obtained in Vp and Vs velocity images. The profile across the Chi-Chi hypocenter shows clear variation on Qs image across the ruptured Chelungpu fault. Our results show that the Qs images provide significant information for further understanding the tectonic structure of Taiwan.
Chan, Christine F. "Constructing a sheeted magmatic complex within the lower arc crust : insights from the Tenpeak pluton, North Cascades, Washington." Thesis, 2012. http://hdl.handle.net/1957/36070.
Full textGraduation Date: 2013
Pfänder, Jörg A. [Verfasser]. "Oceanic crust and island arc formation in Central Asia during late Neoproterozoic times : evidence from petrological and geochemical studies / Jörg A. Pfänder." 2001. http://d-nb.info/963931210/34.
Full text吳燕明. "Mineralogy and petrology of the rocks in the continental margin arc-oceanic crust contact zone in a backarc basin:as exemplified by the Laohushan raea, Eastern North Qilian Orogenic belt, NW China." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/32230691737276439714.
Full textIvey, Kathryn Nicole. "Transcriptional regulation of neural crest-derived pharyngeal arch artery development." 2004. http://edissertations.library.swmed.edu/pdf/IveyK121504/IveyKathryn.pdf.
Full textTumbleson, Danika M. "Treatment and genetic analysis of craniofacial deficits associated with down syndrome." Thesis, 2014. http://hdl.handle.net/1805/6432.
Full textDown syndrome (DS) is caused by trisomy of human chromosome 21 (Hsa21) and occurs in ~1 of every 700 live births. Individuals with DS present craniofacial abnormalities, specifically an undersized, dysmorphic mandible which may lead to difficulty with eating, breathing, and speech. Using the Ts65Dn DS mouse model, which mirrors these phenotypes and contains three copies of ~50% Hsa21 homologues, our lab has traced the mandibular deficit to a neural crest cell (NCC) deficiency in the first pharyngeal arch (PA1 or mandibular precursor) at embryonic day 9.5 (E9.5). At E9.5, the PA1 is reduced in size and contains fewer cells due to fewer NCC populating the PA1 from the neural tube (NT) as well as reduced cellular proliferation in the PA1. We hypothesize that both the deficits in NCC migration and proliferation may cause the reduction in size of the PA1. To identify potential genetic mechanisms responsible for trisomic PA1 deficits, we generated RNA-sequence (RNA-seq) data from euploid and trisomic E9.25 NT and E9.5 PA1 (time points occurring before and after observed deficits) using a next-generation sequencing platform. Analysis of RNA-seq data revealed differential trisomic expression of 53 genes from E9.25 NT and 364 genes from E9.5 PA1, five of which are present in three copies in Ts65Dn. We also further analyzed the data to find that fewer alternative splicing events occur in trisomic tissues compared to euploid tissues and in PA1 tissue compared to NT tissue. In a subsequent study, to test gene-specific treatments to rescue PA1 deficits, we targeted Dyrk1A, an overexpressed DS candidate gene implicated in many DS phenotypes and predicted to cause the NCC and PA1 deficiencies. We hypothesize that treatment of pregnant Ts65Dn mothers with Epigallocatechin gallate (EGCG), a known Dyrk1A inhibitor, will correct NCC deficits and rescue the undersized PA1 in trisomic E9.5 embryos. To test our hypothesis, we treated pregnant Ts65Dn mothers with EGCG from either gestational day 7 (G7) to G8 or G0 to G9.5. Our study found an increase in PA1 volume and NCC number in trisomic E9.5 embryos after treatment on G7 and G8, but observed no significant improvements in NCC deficits following G0-G9.5 treatment. We also observed a developmental delay of embryos from trisomic mothers treated with EGCG from G0-G9.5. Together, these data show that timing and sufficient dosage of EGCG treatment is most effective during the developmental window the few days before NCC deficits arise, during G7 and G8, and may be ineffective or harmful when administered at earlier developmental time points. Together, the findings of both studies offer a better understanding of potential mechanisms altered by trisomy as well as preclinical evidence for EGCG as a potential prenatal therapy for craniofacial disorders linked to DS.