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Dissertations / Theses on the topic 'Volcanoes'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Bell, Andrew Forbes. "Patterns of volcano-tectonic seismicity at basaltic volcanoes." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1444163/.

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Accelerating rates of volcano-tectonic (VT) earthquakes are a common precursor to volcanic eruptions and reflect fracture growth within the edifice. Theoretical models interpret the patterns in terms of failure of the volcanic edifice under the magmatic load and promise improved eruption forecasting. However, many eruptions at frequently active basaltic volcanoes are reported to begin with little change in the rate of VT earthquakes, apparently in conflict with edifice failure models. This thesis investigates the spatial and temporal patterns of VT earthquakes associated with eruptive and intr
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2

Gulmammadov, Rashad. "Seismic geomechanics of mud volcanoes." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/seismic-geomechanics-of-mud-volcanoes(e579a3af-0881-4f52-b14a-dd360304f337).html.

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Mud volcanoes constitute an important component of petroliferous basins and their understanding is essential for successful exploration and development of hydrocarbon fields. They occur in both extensional and compressive tectonic settings, along with passive and active continental margins. Although extensive research exists on the geochemistry, geomorphology and stratigraphic evolution of these localized fluid flow structures, little is known about their geomechanical characteristics. This research investigates the geomechanics of mud volcanoes from the South Caspian Basin and West Nile Delta
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3

Auer, Sara Lynn. "Diverse oxygen isotope values and high magmatic water contents within the volcanic record of Klyuschevskoy Volcano, Kamchatka, Russia /." Connect to title online (Scholars' Bank), 2007. http://handle.net/1794/6054.

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4

Burrell, Rhian. "Volcanic instability and associated uncertainties at Soufrière Hills Volcano, Montserrat and other volcanoes." Thesis, Lancaster University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435873.

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5

Lane, Lucille Richards. "Hazard Vulnerability in Socio-Economic Context: An Example from Ecuador." [Tampa, Fla. : s.n.], 2003. http://purl.fcla.edu/fcla/etd/SFE0000076.

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6

Beachly, Matthew William 1986. "The Upper Crustal P-wave Velocity Structure of Newberry Volcano, Central Oregon." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11475.

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xii, 98 p. : ill. (some col.)<br>The upper-crustal seismic-velocity structure of Newberry volcano, central Oregon, is imaged using P-wave travel time tomography. The inversion combines a densely-spaced seismic line collected in 2008 with two USGS seismic experiments from the 1980s. A high-velocity ring (7 km EW by 5 km NS) beneath the inner caldera faults suggests an intrusive ring complex 200 to 500 m thick. Within this ring shallow low velocities (<2 km depth) are interpreted as caldera fill and a subsided block. High velocities below 2 km depth could be intrusive complexes. There appears to
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7

Jolis, 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.

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The focus of this work is magma-crust interaction processes and associated crustal volatile release in subduction zone volcanoes, drawing on rock, mineral, and gas geochemistry as well as experimental petrology. Understanding the multitude of differentiation processes that modify an original magma during ascent to the surface is vital to unravel the contributions of the various sources that contribute to the final magmas erupted at volcanoes. In particular, magma-crust interaction (MCI) processes have been investigated at a variety of scales, from a local scale in the Vesuvius, Merapi, and Kel
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8

Palma, Lizana José Luis. "Degassing of open-vent low-silica volcanoes." Thesis, Open University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499458.

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Open-vent activity at volcanoes of low-silica composition, such as Stromboli (Italy), Villarrica (Chile), Mt. Erebus (Antarctica), Masaya (Nicaragua), is characterised by persistent passive gas emission and recurrent mild explosive outgassing. Four styles of bubble bursting activity have been recognised in such volcanoes: seething magma, small short-lived lava fountains, strombolian explosions and gas puffing. Whilst strombolian explosions are perhaps the most common among these volcanoes, seething magma and small lava fountains have been observed only at the surface of active lava lakes. At V
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9

Allen, Daniel R. "Temperature and Variability of Three Ionian Volcanoes." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2591.

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Cassini spacecraft images of Io obtained during its flyby of Jupiter in late 2000 and early 2001 were used to determine the lava composition and eruption style of three faint hotspots, Pillan, Wayland, and Loki. We found a maximum color temperature of 1130+/-289 K for Pillan and maximum color temperatures of 1297+/-289 K and 1387+/-287 K for Wayland and Loki, respectively. These temperatures are suggestive of basaltic lava. The temperatures with the best signal-to-noise ratios also suggested basaltic lava and were found to be 780+/-189 K, 1116+/-250 K, and 1017+/-177 K for Pillan, Wayland, and
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10

Woog, Friederike. "Ecology and behavior of reintroduced Hawaiian geese." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=959320423.

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11

Garrison, Jennifer Marie. "Magmatic processes at Cotopaxi Volcano, Ecuador geochemical and petrological constraints and interferences for continental arc volcanoes /." Diss., Restricted to subscribing institutions, 2004. http://proquest.umi.com/pqdweb?did=795958281&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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12

Roberts, Nick Stuart. "Earthquake distributions at volcanoes : models and field observations." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/23653.

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Volcanic earthquakes can provide significant insight into physical processes acting at volcanoes, such as magma accumulation and the mechanisms of deformation of the volcanic edifice. At the same time a statistical analyses of volcanic seismicity prior to an eruption (for example variations in the Gutenberg-Richter b-value – a measure of the proportion of large and small events) are a key component of the practical problem of forecasting eruptions. This thesis aims to tackle two key areas of research that are closely related to these important overall goals, by comparing seismic data obtained
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13

Llewellyn, Huw Richard. "Facies modelling of a low angle shield volcano and associated extrusive volcanics within the North Atlantic Igneous Province." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230048.

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14

Davies, Mark Andrew. "Application of gravity techniques to volcanic studies." Thesis, Open University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251382.

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15

Jones, Joshua Robert. "Investigating volcano tectonic interactions in the Natron Rift of the East African Rift System." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103780.

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Continental rifting, like other plate tectonic processes, plays a large role in shaping the Earth's crust. Active rift zones evolve from repeated tectonic and magmatic events including volcanic activity. Through investigations of currently and previously active rifts, scientists have discovered considerable interactions between these tectonic and magmatic processes during a rift's evolution; however questions remain about these interactions especially in youthful stages of rifts. We investigate an early phase magma-rich section of the East African Rift System (EARS), named the Eastern Branch t
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16

Fournier, Nicolas. "Shallow volcanic processes at persistently active volcanoes : evidence from a multidisciplinary study at Poás volcano, Costa Rica." Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411251.

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17

Mahony, Susan Helen. "The spatial and temporal distribution of volcanoes in Japan." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505756.

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Japan is located on the westem edge of the Pacific plate, in one of the most dynamic areas on Earth, with approximately 80 active volcanoes and considerable tectonic activity. The Japanese Nuclear Waste Management Organisation (NUMO) will construct a deep geological repository for high level nuclear waste somewhere in Japan. Potential hazard posed by a new volcanic event occurring and disrupting this facility during its operational lifetime need to be thoroughly assessed.
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18

Rowlands, Daniel. "Seismic investigations of active volcanoes in extensional tectonic settings." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436641.

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19

Spampinato, Letizia. "Thermal monitoring of active volcanoes using portable infrared imagers." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609816.

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20

Bredemeyer, Stefan [Verfasser]. "Monitoring gas emissions of active volcanoes - identification of natural degassing variations and combination of volcano monitoring techniques / Stefan Bredemeyer." Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/112814932X/34.

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21

Sawyer, Nuni-Lyn E. "Systematic geochemical and eruptive relations in the late stage evolution of volcanoes from the Hawaiian plume : with case studies of Waianae and East Molokai volcanoes /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6704.

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22

Daniels, Katherine Anne. "Modelling magma transport : a study of dyke injection." Thesis, University of Bristol, 2013. http://hdl.handle.net/1983/b32d1ddc-a0ae-437e-8d7c-11d08c2cc72f.

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Dyke injection transports large volumes of magma over great distances, controlling the supply of magma to volcanoes and effectively releasing tensional stress at divergent plate margins. This thesis aims to improve understanding of dyke injection processes on different scales. Dyke shapes measured on the Isle of Rum have been analysed and show a mismatch between the currently accepted theory used to describe their shape, and the measured data. The measured dykes show wider edges than expected, consistent with wedging and cooling of magma in the dyke tips; wedged dykes can act as conduits for l
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23

Moore, Lowell. "The volatile contents of melt inclusions and implications for mantle degassing and ocean island evolution." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93345.

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The amount of volatile elements dissolved in silicate melts is a controlling factor in a range of geologic processes, which include hazardous volcanic eruptions, economically-significant ore-forming systems, and global-scale volatile fluxes, which contribute to planetary evolution. While melt volatile contents are important, estimating the origin and fate of volatiles distributed within magmas is challenging because volatiles exsolve from the melt during eruption and are transferred into the atmosphere. Therefore, the stratigraphic record of volcanic and intrusive deposits does not contain dir
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24

Witter, Jeffrey Bruce. "Convection of magma in volcanic conduits as a degassing mechanism at active volcanoes /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6721.

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25

Walwer, Damian. "Dynamique non linéaire des systèmes volcaniques à partir des données géodésiques." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE004/document.

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Nous étudions dans un premier temps l'intérêt de l'utilisation de la "multichannel singular spectrum analysis" (M-SSA) sur des séries temporelles de positionnements GPS. Cette méthode permet de simultanément analyser un ensemble de séries temporelles et d'en extraire des modes de variabilités communs sans utiliser d'information a priori sur les structures spatiales et temporelles des champs géophysiques. Ces modes correspondent à des tendances non linéaires, des oscillations ou du bruit. Nous l'appliquons à des données enregistrées sur le volcan Akutan en Alaska. Nous y extrayons deux types de
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26

Stone, Jonathan. "The roles of participatory monitoring in reducing risk around volcanoes." Thesis, University of East Anglia, 2015. https://ueaeprints.uea.ac.uk/61697/.

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This thesis examines the roles of participatory monitoring in reducing disaster risk around volcanoes, by the production of knowledge, enhancing the provision of early warnings, and stimulating risk reducing adaptations. Citizen participation in processes that manage and reduce risk is thought to be essential for building resilient and sustainable development. This thesis addresses gaps in theoretical and practical understanding of the roles of citizens in the production and use of knowledge through participatory monitoring, and the roles of participatory monitoring in reducing risk. Findings
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27

Yassir, Najwa A. "Mud volcanoes and the behaviour of overpressured clays and silts." Thesis, University College London (University of London), 1989. http://discovery.ucl.ac.uk/1349596/.

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Mud volcanoes are a poorly understood phenomenon whereby overpressured, fine-grained sediments extrude to the surface from depths of up to several kilometres. They are observed worldwide, usually in areas of tectonic compression and thick, rapidly-deposited sedimentary sequences. This research is aimed at achieving a better understanding of the type of sediment behaviour leading to mud volcanoes. The study combines a geological investigation of the origin of mud volcanoes with a geotechnical investigation of their behaviour. As part of the geological study, the mud volcano examples around the
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28

Harris, Andrew John Lang. "Thermal monitoring of volcanoes from space at low spatial resolution." Thesis, Open University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309863.

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29

Hornby, A. J. "Fracture, friction and fragmentation : brittle processes at lava dome volcanoes." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3005862/.

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The extent to which transitions from dominantly viscous to dominantly brittle magma deformation regulate eruptive activity has not been widely explored in volcanology. Within this thesis, investigations combining experiments, petrology and geophysical signals are presented to help decipher and understand the role of brittle deformation during lava dome eruptions. Lava domes are commonly associated with explosions and dome collapse events, both of which generate volcanic ash. In order to recognise and discriminate fragmentation mechanisms from ash samples, the physical properties and mineralogy
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30

Salem, Lois Claire. "Magmatic processes at basaltic volcanoes : insights from the crystal cargo." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277726.

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A plethora of magmatic processing occurs in magma reservoirs, where melts are stored prior to eruption. Magma reservoirs are complex, open systems, and often multiple reservoirs are partially inter-connected from source to surface, giving rise to the term 'volcanic plumbing system'. Parental melts feeding these reservoirs can have diverse and distinct geochemical and petrological characteristics, and be variably evolved or enriched. These melts can also bring with them a crystal cargo that may remain in equilibrium in the magma reservoir, but may also be modified by reaction, resorption, cryst
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31

Zoghbi, Christiane A. (Christiane Antoine). "Rural groundwater supply for the Volcanoes National Park region, Rwanda." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39272.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2007.<br>Includes bibliographical references (leaves 81-83).<br>Water scarcity is a major issue faced by both developed and developing countries. According to the Millennium Development Goals set by the United Nations, the number of people that do not have access to an improved water supply should be halved by the year 2015. Rwanda is a Sub-Saharan developing country where water scarcity is an issue. This thesis presents results from a preliminary evaluation of possible groundwater supply to
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32

Alfaro, Raimon. "Seismic studies of active volcanoes under the Vatnajökull icecap, Iceland." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620170.

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33

McNeilage, Alastair John. "Mountain gorillas in the Virunga volcanoes : ecology and carrying capacity." Thesis, University of Bristol, 1995. http://hdl.handle.net/1983/13bb843d-3c07-4c18-838f-15aa71d766b4.

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34

Rodrigues, Clara Lúcia Ferreira. "Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz." Doctoral thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/981.

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Doutoramento em Biologia<br>Desde a descoberta em 1999 do primeiro vulcão de lama no Golfo de Cádis, cerca de 40 locais, de profundidade variável entre os 200 e os 3900 m, com diferentes graus de emissão de hidrocarbonetos foram localizados e amostrados dentro do programa IOC-UNESCO “Training Through Research (TTR) “ e mais recentemente dentro do projecto europeu HERMES. Neste estudo investigamos as comunidades da macrofauna dos vulcões de lama do Golfo de Cádis utilizando uma diversidade de equipamento de amostragem quantitativo e não quantitativo. Mais de 14550 espécimes foram examinados e
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35

Karl, Sandra. "The source mechanisms of low frequency seismic events on volcanoes." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/8406/.

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Volcanoes generate a variety of seismic signals. One specific type, the so-called low frequency (LF) event, has proven to be crucial for understanding the internal dynamics of the volcanic system. While many endeavours have concentrated on the nature and cause of the seismic coda, the actual trigger mechanism of these events is still poorly understood. Several conceptual source models have been developed, ranging from magma-water interaction, stick-slip motion of magma plugs, magma flow instabilities, repeated release of gas-ash mixtures into open cracks, magma wagging, to brittle fracturing o
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36

Stevenson, David Stacey. "Heat transfer in active volcanoes : models of crater lake systems." Thesis, Open University, 1992. http://oro.open.ac.uk/57398/.

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Heat transfer in active volcanoes was investigated in this thesis. A general model of a crater lake system was developed that takes inputs of lake temperature, volume, chemical content, and meteorological conditions, and outputs the mass, energy, and chemical flows to and from the lake. The model was applied to lakes at Pods (Costa Rica) and Ruapehu (New Zealand), yielding volcanic power outputs of -102-103 MW, and heat fluxes of -102-104 W m-2. Heat is added to the lakes by hot brine and steam, derived from lake seepage and magmatic gas. The heat source is magma crystallising, cooling, and de
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37

Deardorff, Nicholas D. 1980. "Eruptive Processes of Mafic Arc Volcanoes – Subaerial and Submarine Perspectives." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11969.

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xviii, 179 p. : ill. (some col.). Includes 3 video files.<br>Mafic arc volcanoes have eruption styles that range from explosive to effusive. In a broad sense, eruption style is controlled by the rate of magma supply to the vent. In this dissertation I examine relationships between eruption rate and style in two separate studies: (1) an investigation of ongoing activity at NW Rota-1, a submarine volcano in the Mariana arc, and (2) a morphologic study of the Collier Cone lava flow field in the Central Oregon Cascades. The eruptions of NW Rota-1 range from effusive to moderately explosive; eru
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38

Ohlschlager, Justin George. "Glacier Change on the Three Sisters Volcanoes, Oregon: 1900-2010." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2448.

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A glacier responds to changes in climate by subsequent retreat and advance as a result of changes in snow inputs and outputs. Understanding these changes is important because shrinking glaciers limit and diminish local water resources. They contribute to alpine runoff in the late-summer months by delaying the maximum runoff until late in the melt season. A comprehensive glacier and perennial snowfield inventory has not been completed for the Three Sisters in Central Oregon. Using aerial photography, Digital Elevation Models (DEMs), previous studies, and historical ground based photographs thes
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39

Wooten, Rebecca Dyanne. "Statistical environmental models : hurricanes, lightning, rainfall, floods, red tide and volcanoes." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001824.

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40

Beckett, F. M. "Exchange flow experiments and implications for degasing processes at basaltic volcanoes." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573419.

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Persistently active basaltic volcanoes are characterised by Strombolian eruptions that punctuate continuous passive degassing. Persistent passive degassing can be driven by an exchange flow of magma within the conduit. To interpret persistent gas emissions and changes in activity requires some knowledge of the flow regime and an understanding of how its volume flux depends on the physical properties of the magma and the conduit geometry. This thesis presents an experimental study of buoyancy-driven, low Reynolds number, (Re < 6) exchange flow of two Newtonian fluids in a vertical cylindrical p
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41

Collins, S. J. "Degassing of volatiles and semi-volatile trace elements at basaltic volcanoes." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597860.

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At Mt. Etna, Italy, vigorous gas-rich eruptions in 2001, 2002 and 2003 were followed by gas-poor eruptions in 2004, 2006 and 2007. Contrary to expectation, melt inclusion compositions indicate that magmas erupted between 2004 to 2007 did not follow similar degassing paths as recorded in 2001 and 2002 and that are expected from the solubility laws of CO<sub>2</sub> and H<sub>2</sub>O. Instead melts stored in the plumbing system since 2002 reequilibrated with CO<sub>2</sub>-rich gases from depth. Sustained gas percolation caused loss of water and enhancement of CO<sub>2</sub> in the evolving mel
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42

Edwards, James Anthony. "Modelling stresses around the volcanoes of Kilauea, Hawaii and NW Scotland." Thesis, University of Leeds, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431895.

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43

Brian, Antony William. "A study of large volcanoes and their geological settings on Venus." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268441.

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44

Tuyisingize, Deogratias. "Terrestrial small mammal community composition in the Volcanoes National Park, Rwanda." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/4763.

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Bone, B. D. "The geological evolution of the S.W. Naivasha volcanic complex." Thesis, Lancaster University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379196.

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46

Wooster, Martin John. "Spaceborne monitoring of high temperature volcanic thermal features : studies using the ERS Along Track Scanning Radiometer." Thesis, Open University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264468.

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47

Woods, Jennifer. "Dyke-induced earthquakes during the 2014-15 Bárðarbunga-Holuhraun rifting event, Iceland." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289448.

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Understanding dykes is vital as they serve both as bodies that build the crust and as conduits that feed eruptions. The 2014-15 Bárðarbunga-Holuhraun rifting event comprised the best-monitored dyke intrusion to date and the largest eruption in Iceland in 230 years. Over a 13 day period magma propagated laterally from the subglacial Bárðarbunga volcano, Iceland, along a 48 km path before erupting in the Holuhraun lava field on 29 August 2014. A huge variety of seismicity was produced, including over 30,000 volcano-tectonic earthquakes (VTs) associated with the dyke propagation at ∼ 6 km depth
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48

McCormick, Brendan Thomas. "Measuring volcanic sulphur dioxide degassing with the satellite-based Ozone Monitoring Instrument." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648608.

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49

Contreras, Vargas María Angélica. "The control of magmatic system properties on volcano dimensions and building: The cases of Lascar, Lonquimay and Llaima volcanoes, Andes of Chile." Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/149095.

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Magíster en Ciencias, Mención Geología<br>Los estratovolcanes son la manifestación en superficie de complejos sistemas magmáticos profundos. En el presente trabajo, se ha desarrollado un modelo cuyo objetivo es contribuir a la comprensión de la influencia de las propiedades del sistema magmático de un estratovolcán, en el perfil topográfico y dimensiones del mismo. Se asume un volcán construido por la acumulación de flujos de lava emitidos desde un centro de emisión único, excluyendo otros procesos que pueden afectar el crecimiento tales como erosión, avalanchas, volcanismo adventicio, acumu
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50

Giuffrida, Marisa. "Magma storage, ascent and degassing histories traced by textures and chemical zoning in crystals: application to the C02-Rich basaltic system of Mt. Etna Volcano." Doctoral thesis, Università di Catania, 2018. http://hdl.handle.net/10761/3632.

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An extensive compositional dataset of plagioclase and olivine crystals from lavas emitted between the 2011 and 2013 at Mt. Etna has been used to constrain modes and timescales of magma storage and transfer to the surface. Plagioclase crystals display either near-equilibrium or disequilibrium textures at the core and rim that indicate complex histories of magma crystallization under variable chemical and physical conditions. Crystals with different textures have been characterized for major (An), minor (Fe and Mg) and trace elements (Sr/Ba). The Sr /Ba ratio in oscillatory-zoned plagioclase rev
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