Essays about: "plagioclase"

Showing result 16 - 20 of 33 essays containing the word plagioclase.

  1. 16. Crystallization and Emplacement of the Monte Amarelo Dikes: Magma Storage Assessment on Fogo, Cape Verde Islands

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Olle Risby; [2017]
    Keywords : Fogo; magma storage model; thermobarometry; clinopyroxene; intrusion landslide.; Fogo; magmalagringsdjup; termobarometri; klinopyroxen; intrusion; skred;

    Abstract : The volcanic island of Fogo belongs to the Cape Verde archipelago, a two-tiered chain of islands situated 500 km west of the African coast. Fogo is regarded as one of the most active volcanoes in the world with 10 eruptions during the last 250 years. The former shield volcano Monte Amarelo reached 3500 m.a. READ MORE

  3. 17. [87]Sr/[86]Sr in plagioclase, evidence for a crustal origin of the Hakefjorden Complex, SW Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Alexandra Glommé; [2015]
    Keywords : Plagioclase; Älgön; Sr-isotopes; Sweden; MC-ICP-MS; Hakefjorden complex; geochemistry; SEM; Earth and Environmental Sciences;

    Abstract : The studied intrusion, the Hakefjorden Complex on Älgön is a norite-anorthosite complex situated in the archipelago on the west coast of Sweden. The origin of the intrusion will be deduce through in situ Sr-isotope analysis by MC-ICP-MS (multiple collector- inductively coupled plasma- mass spectrometry) on plagioclase, together with petrographic description and chemical analysis. READ MORE

  4. 18. Understanding igneous processes through zircon trace element systematics : prospects and pitfalls

    University essay from Lunds universitet/Geologiska institutionen

    Author : Marín Ósk Hafnadóttir; [2014]
    Keywords : plagioclase fractionation. zirkon; hydrothermal alteration; precambrian; zircon; Ghana; hydrotermal-omvandling; plagioklasfraktionering; Earth and Environmental Sciences;

    Abstract : Zirkon från magmatiska bergarter extraherades från fem granitoider i Birimianterrängen i Ghana., och detritala zirkoner provtogs från sex platser i centrala Västgrönland. Av dessa härrör en population från palaeoproterozoikum i Prøvens magmatiska komplex. READ MORE

  5. 19. Petrographic study of high-grade gneisses, Halland area

    University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

    Author : Diana Carlsson; [2014]
    Keywords : ;

    Abstract : This is a petrographic study of high-grade gneisses in the Halland area, Sweden. During bedrock mapping by the Swedish Geological Survey, three principal petrographically distinct gneiss domains have been recognized: the Skene, Varberg, and Halmstad domain. READ MORE

  6. 20. Characterising the magma supply system of Agung and Batur volcanoes on Bali, Indonesia

    University essay from Uppsala universitet/Berggrundsgeologi

    Author : Harri Geiger; [2014]
    Keywords : Bali; Batur; Agung; thermobarometry; clinopyroxene; plagioclase;

    Abstract : Volcanic and magmatic processes are controlled by the composition of the magmas involved and the nature and structure of their underlying plumbing systems. To understand and predict volcanic behaviour, it is of critical importance to characterize the associated magmatic plumbing and supply system. READ MORE