Sökning: "Xenoliths"

Visar resultat 1 - 5 av 8 uppsatser innehållade ordet Xenoliths.

1. 1. Origin of Silicic Magmatism at the Katla Volcano, South Iceland

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Caroline Svanholm; [2021]
   Nyckelord :Katla volcano; Iceland; high-silica rocks; oxygen isotopes; AFC processes; Vulkanen Katla; Island; kiselrika bergarter; syreisotoper; AFC-processer;

   Sammanfattning : Katla volcano, South Iceland, is a bimodal volcanic system hosting an unusual high number of silicic rocks within a basaltic rift setting. The petrogenesis of silica-rich rocks at Katla is controversial and two end-member hypotheses have been suggested. LÄS MER

3. 2. Implications of Magma and Bedrock Interaction, a Study of Xenopumice from La Palma, the Canary Islands

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Beatrice Jägerup; [2019]
   Nyckelord :La Palma; xenopumice; phreatomagmatism; whole rock geochemistry; oxygen isotopes; La Palma; felsiska xenoliter; explosiv vulkanism; geokemi; syreisotoper;

   Sammanfattning : This thesis focuses on frothy, felsic xenoliths called ‘xenopumice’, that were retrieved from La Palma during a 10–day field campaign in December 2018. There are only few descriptions of these frothty xenoliths, and a consensus on their origin has not yet been achieved. LÄS MER

4. 3. The Origin of the Gran Canarian Xenoliths

   Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Beatrice Jägerup; [2016]
   Nyckelord :Gran Canaria; Xenoliths; Oxygen Isotope Value; Thin Section Analysis; EPM;

   Sammanfattning : Xenoliths are pieces from the surrounding bedrock, brought to the surface of the earth by host magma. On Gran Canaria, the largest island in the Canary Islands archipelago, strange xenoliths have been found. They are light in color, porous and very different from the basaltic magma carrying them. LÄS MER

5. 4. Determining the depth of magma storage by investigation of samples from the eruption on La Palma 1971

   Kandidat-uppsats, Institutionen för geovetenskaper

   Författare :Anna Svensson; [2013]
   Nyckelord :canary islands; volcanism; magma storage;

   Sammanfattning : The Canary islands are formed by a slow moving hotspot, from Fuerteventura 20 Ma to el Hierro 1.2Ma years old and La Palma is in the shield building stage of evolution. La Palma had its last eruption 1971 and has had seven eruptions since 1430, which makes it the most active of the islands in our times. LÄS MER

7. 5. Magmatic Stoping and a Case Study from the Åva Ring Complex, Finland

   Kandidat-uppsats, Institutionen för geovetenskaper

   Författare :Hanna Lagergren; [2012]
   Nyckelord :;

   Sammanfattning : Magmatic stoping is a term that has been controversial almost since it was first mentioned over a century ago. Scientists have been arguing whether it plays an important part as an emplacement process of magma chambers, or whether it takes place at all. LÄS MER