Essays about: "caldera"

Showing result 6 - 10 of 11 essays containing the word caldera.

  1. 6. The late Holoce 14C reservoir age in the Chukchi Sea as inferred from tephra in marine sediments

    University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

    Author : Aron Varhelyi; [2016]
    Keywords : Tephra; Aniakchak; Holocene; Chukchi Sea;

    Abstract : Volcanic ash, or tephra, blankets the local and regional landscape following a volcanic eruption. If this ash layer is preserved and identified, it can act as a time synchronous marker bed (isochron) for correlation between marine, terrestrial, glacial and lacustrine deposits. READ MORE

  3. 7. 3D Modelling of the Tejeda Cone-Sheet Swarm, Gran Canaria, Canary Islands, Spain

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Lisa K. Samrock; [2015]
    Keywords : Cone-sheet swarm; 3D modelling; Tejeda caldera; Gran Canaria; magma chamber reconstruction; sheet intrusions; Inverterade koniska intrusionssvärmar; 3D-modellering; Tejeda kaldera; Gran Canaria; rekonstruktion av magmakammare; magmatiska intrusioner;

    Abstract : Cone-sheet swarms are magmatic sheet intrusions and part of volcanic plumbing systems and are pathways for magma to the Earth’s surface, where they feed volcanic eruptions. The analysis of cone-sheets provides information on the geometry of the magmatic plumbing system of a volcano and allows to understand processes and dynamics of magma transport. READ MORE

  4. 8. Carbonatites at the Alnö Complex, Sweden and along the East African Rift : a literature review

    University essay from Lunds universitet/Geologiska institutionen

    Author : Alexandra Åhlén; [2015]
    Keywords : natrocarbonatite; East African Rift; carbonatite; Alnö Island; Earth and Environmental Sciences;

    Abstract : Carbonatite is an unusual type of rock that, for a long time, were not accepted for what they really are. This group of rocks is now considered to be of igneous origin and is classified after its content of carbonate minerals. If it exceed 50% the rock will be named a carbonatite. READ MORE

  5. 9. Probing the Toba super-eruption: Insights from oxygen isotope geochemistry and geobarometry

    University essay from Berggrundsgeologi

    Author : David Budd; [2011]
    Keywords : super-eruption; oxygen isotopes; geobarometry; Toba; magmatic plumbing; caldera;

    Abstract : The Toba caldera located in north Sumatra, Indonesia, is the source of the largest volcanic eruption in the Quaternary (Rose & Chesner 1987). Its enormous volume of 2800 km3 has been a matter of debate for decades and it is still unclear where and how the Toba magma was assembled. READ MORE

  6. 10. Investigating Magma Plumbing Beneath Anak Krakatau Volcano, Indonesia : Evidence for Multiple Magma Storage Regions

    University essay from Berggrundsgeologi

    Author : Börje Dahrén; [2010]
    Keywords : Anak Krakatau; thermobarometry; magma plumbing; clinopyroxene; plagioclase;

    Abstract : Improving our understanding of magma plumbing and storage remains one of the majorchallenges for petrologists and volcanologists today. This is especially true for explosivevolcanoes, where constraints on magma plumbing are essential for predicting dynamicchanges in future activity and thus for hazard mitigation. READ MORE