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Showing 1 to 20 of 142 for “"Lavas"”.

  1. MAGNETIC DATING OF VESUVIAN LAVAS

    Tiano, Pasquale2001

    … using magnetic information recorded by Vesuvian lavas to define the geomagnetic field direction and intensity at the time of their eruption. It is shown that numerous lava flows, outcropping on the W to S slopes of the volcano, must be associated to a large eruption in AD 1631, confirming some …

    plymouth Repository record

  2. Geochemistry of Hawaiian dredged lavas

    Gurriet, Philippe C. (Philippe Charles)Massachusetts Institute of Technology1988

    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.

    mit Repository record

  3. Constraints on the petrogenesis of lavas from large plumes : inferences from geochemical studies of lavas from Mauna Kea, Hawaii, and Mt. Bureau, Kerguelen archipelago

    Yang, Huai-Jen, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology1996

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.

    mit Repository record

  4. Petrogenesis of lavas from Volcano Azufre, Northern Chile: evidence for crustal input

    Lister, JamesDepartment of Geological Sciences2019

    … could both have had a major effect on erupting lavas. Elemental concentration and isotope data are used here to examine the role that the APMB has had on the evolution of Azufre. This data set is also compared to those of previously studied volcanoes of the APVC to further provide understanding …

    cape-town Repository record

  5. Aspects of the geochemistry of Onverwacht Group lavas from the Barberton Greenstone Belt

    Smith, Hudson StuartDepartment of Geological Sciences1980

    … 3540 million year old komatiitic and tholeiitic lavas in the Onverwacht Group (Barberton greenstone belt) crop out in the rugged terrain of the eastern Transvaal lowveld. The results of an investigation into the geochemistry of the lavas, mainly from the three lower Formations of the Onverwacht …

    cape-town Repository record

  6. Evolution of lavas at Mt. Shasta volcano, N. California : an experimental and petrologic study

    Baker, Michael BaldwinMassachusetts Institute of Technology1988

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.

    mit Repository record

  7. The geochemistry and petrogenesis of lavas from the Comores Archipelago, Western Indian Ocean (Volume 2)

    Spath, AndreasDepartment of Geological Sciences1994

    … 87Sr/86Sr and 143Nd/144Nd compositions for lavas from three of the four main islands of the archipelago are presented. The alkaline lavas of the Comores range in texture from sparsely to strongly porphyritic, containing phenocrysts of olivine, clinopyroxene, amphibole, feldspar, Fe-Ti oxide …

    cape-town Repository record

  8. The geochemistry and petrogenesis of lavas from the Comores Archipelago, Western Indian Ocean (Volume 1)

    Spath, AndreasDepartment of Geological Sciences1994

    … 87Sr/86Sr and 143Nd/144Nd compositions for lavas from three of the four main islands of the archipelago are presented. The alkaline lavas of the Comores range in texture from sparsely to strongly porphyritic, containing phenocrysts of olivine, clinopyroxene, amphibole, feldspar, Fe-Ti oxide …

    cape-town Repository record

  9. The geochemistry of undersaturated arc lavas from the Tabar-Feni island groups, Papua New Guinea

    Kennedy, Allen KenMassachusetts Institute of Technology1988

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.

    mit Repository record

  10. Enriched geochemical signatures in Aleutian and Indonesian arc lavas : an isotopic and trace element investigation

    Morris, Julie DianneMassachusetts Institute of Technology1984

    Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.

    mit Repository record

  11. Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

    Jackson, Matthew G.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2008

    … total Sr-isotope variability observed in Samoan lavas. Chapter 3 deals with the largest possible scales of mantle heterogeneity, and presents the highest magmatic 3He/4He (33.8 times atmospheric) discovered in Samoa and the southern hemisphere. Along with Samoa, the highest 3He/4He sample from …

    woods-hole Repository record

  12. Commonalities in the emplacement of cooling-limited lavas : insights from the 2011-2012 Cordón Caulle rhyolitic eruption

    Magnall, Nathan, James, Michael, Tuffen, Hugh, Vye-Brown, CharlotteLancaster University2018

    … of the emplacement of high-viscosity rhyolitic lavas. The 2011-2012 eruption of Puyehue-Cordón Caulle in southern Chile provided a unique opportunity to make scientific observations of an active rhyolitic lava flow. The thesis utilises a multiscale approach to draw comparisons between the …

    lancaster Repository record

  13. Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

    Jackson, Matthew G. (Matthew Gerald)Massachusetts Institute of Technology2008

    … total Sr-isotope variability observed in Samoan lavas. Chapter 3 deals with the largest possible scales of mantle heterogeneity, and presents the highest magmatic 3He/4He (33.8 times atmospheric) discovered in Samoa and the southern hemisphere. Along with Samoa, the highest 3He/4He sample from …

    mit Repository record

  14. TEMPORAL AND SPATIAL VARIATIONS IN THE GEOCHEMISTRY AND MINERAOLOGY OF THE YOUNGER HISTORIC LAVAS OF MOUNT ETNA, SICILY

    Gyopari, Mark Christopher1988

    … uniform temporal variation in the succession of lavas. Spatial variations in lava composition within individual flow fields are related to high-level magma mixing and crystal fractionation processes. The effects of mixing are demonstrated by incompatible trace element chemistry, phenocryst …

    plymouth Repository record

  15. Quantifying Crustal Assimilation in Historical to Recent (1329-2005) Lavas at Mt. Etna, Italy: Insights from Thermodynamic Modeling

    Takach, Marie2020

    … trends and mineral compositions for pre-1971 lavas are satisfactorily reproduced by fractional crystallization of a parental magma that is a high-Mg (~17 wt.% MgO) basalt to picrite composition. Such a magma is documented in Etna’s ~4 ka pyroclastic fallout deposit. The observed post-1971 …

    central-wash Repository record

  16. Geochemical and petrologic systematics in lavas from Haleakala volcano, East Maui : implications for the evolution of Hawaiian mantle

    Chen, Chu-YungMassachusetts Institute of Technology1983

    Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.

    mit Repository record

  17. B isotope variations at variable scales in arc volcanoes: a case study of lavas from Paniri and Toconce, Northern Chile

    Ncetani, SinethembaDepartment of Geological Sciences2024

    … volcanic vent. This suggest that first erupted lavas assimilated most of the 11B-depleted crustal material locally available, with lava δ11B compositions trending towards basement granitoids and metasediments δ11B values (-11 ‰ to -5 ‰). With continued eruption, lavas progressively contain more …

    cape-town Repository record

  18. Chemical stratification of the crust : isotope, trace element, and major element constraints from crustally contaminated lavas and lower crustal xenoliths

    Reid, Mary RuthMassachusetts Institute of Technology1987

    Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1987.

    mit Repository record

  19. Petrologic, geochemical and isotopic evolution of rhyolite lavas from the Okataina, Rotorua and Kapenga Volcanic Centres, Taupo Volcanic Zone, New Zealand

    Bowyer, Deborah AnnThe University of Waikato2001

    … and isotopic data that focuses on the rhyolite lavas erupted from the OVC. These data have been combined with existing geochronological data and knowledge of vent positions to identify magma types, and hence provide a model for the spatial and temporal evolution of the silicic magmatic system. …

    waikato-masters Repository record

  20. The petrogenesis of the Pliocene Araral stratovolcano in the Andean Central Volcanic Zone, Northern Chile

    Mashego, RamolokwaneDepartment of Geological Sciences2025

    … body – the Altiplano-Puna Magma Body (APMB). Lavas of the APVC and CVZ are compositionally heterogeneous with elevated Sr isotope ratios relative to mantle-derived lavas and the rest of the Andean Volcanic Arc. The lavas are produced by subduction-induced magmatism and magma differentiation …

    cape-town Repository record

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