Är vulkanismen på Kanarieöarna till följd av en hetfläck?
(2025) In Examensarbeten i Geologi vid Lunds universitet GEOL01 20221Department of Geology
- Abstract (Swedish)
- Kanarieöarna är en vulkaniskt bildad ögrupp och trots att området har studerats enormt finns det fortfarande diskussion kring dess bildningsprocess, framför allt var magman kommer ifrån. Det största skälet till denna diskussion är den vulkaniska aktiviteten som kvarstår på äldre öar, något som inte förekommer i liknande miljöer som Hawaii. Ankaramit är en vanligt förekommande berggrundsart i Teno-massivet på Teneriffa och innehåller mineralet olivin. Med hjälp av olivintermometri går det att retroaktivt bestämma smältans originaltemperatur baserat på förhållandet mellan forsterit och fayalit. Förhållandet reflekterar temperaturen vilket olivinen bildades vid och kan indikera ifall kristallisation tog plats i manteln eller ytligare.... (More)
- Kanarieöarna är en vulkaniskt bildad ögrupp och trots att området har studerats enormt finns det fortfarande diskussion kring dess bildningsprocess, framför allt var magman kommer ifrån. Det största skälet till denna diskussion är den vulkaniska aktiviteten som kvarstår på äldre öar, något som inte förekommer i liknande miljöer som Hawaii. Ankaramit är en vanligt förekommande berggrundsart i Teno-massivet på Teneriffa och innehåller mineralet olivin. Med hjälp av olivintermometri går det att retroaktivt bestämma smältans originaltemperatur baserat på förhållandet mellan forsterit och fayalit. Förhållandet reflekterar temperaturen vilket olivinen bildades vid och kan indikera ifall kristallisation tog plats i manteln eller ytligare. Olivintermometri utfördes på tre tunnslip av ankaramiter och indikerade ett temperaturintervall mellan 1400–1500 °C. Detta strider mot tidigare mätningar som indikerar högre temperaturer. Den troliga anledningen till denna avvikelse är på grund av den fraktionella kristallisationen som proverna har gått igenom, indikerat av zonerade pyroxenfenokrister och en mellanmassa som har bildats ur en annan komposition. Men även en metodik som inte tog i hänsyn fler faktorer som kan påverka uppsmältnings- och kristallisationstemperatur som tryck, andelen fluider, och syrefugacitet. (Less)
- Abstract (Swedish)
- The Canary Islands are an island chain created by volcanic activity, despite extensive studies of the region there is not a clear consensus of their process of creation, primarily there is a question concerning the origin of the magmas which has built up this chain of islands. The largest contributor to these uncertainties is the continued volcanic activity on older islands, something which does not occur in similar instances of island chains such as Hawaii. Ankaramites are commonly found in the Teno-massif on Tenerife and this rock contains the mineral olivine. Utilising olivine thermometry it is possible to determine the crystallisation temperature, based of the relation between forsterite and fayalite within the olivine crystals. This... (More)
- The Canary Islands are an island chain created by volcanic activity, despite extensive studies of the region there is not a clear consensus of their process of creation, primarily there is a question concerning the origin of the magmas which has built up this chain of islands. The largest contributor to these uncertainties is the continued volcanic activity on older islands, something which does not occur in similar instances of island chains such as Hawaii. Ankaramites are commonly found in the Teno-massif on Tenerife and this rock contains the mineral olivine. Utilising olivine thermometry it is possible to determine the crystallisation temperature, based of the relation between forsterite and fayalite within the olivine crystals. This can in turn indicate if the process took place in temperatures expected in the mantle or lower. Olivine thermometry was conducted on three thin sections of ankaramite and the results indicated a temperature range of 1400-1500 °C, substantially lower than that of previous studies. The likely cause for the discrepancy is the fractional crystallisation and a disequilibrium between the phenocrysts of olivine and pyroxene and the fine-grained mass in between. Additionally, the methodology used did not take into consideration several factors affecting melt- and crystallisation-temperature such as pressure, the fraction of fluids as well as oxygen fugacity. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9215453
- author
- Patel Grönberg, Joel LU
- supervisor
- organization
- alternative title
- Is vulcanism on the Canary Islands due to a hotspot?
- course
- GEOL01 20221
- year
- 2025
- type
- M2 - Bachelor Degree
- subject
- keywords
- hetfläck, Kanarieöarna, Teneriffa, vulkanism, olivintermometri, hotspot, Canary islands, Tenerife, vulcanism, olivine thermometry
- publication/series
- Examensarbeten i Geologi vid Lunds universitet
- report number
- 721
- language
- Swedish
- id
- 9215453
- date added to LUP
- 2025-11-17 09:32:35
- date last changed
- 2025-11-17 09:32:35
@misc{9215453,
abstract = {{The Canary Islands are an island chain created by volcanic activity, despite extensive studies of the region there is not a clear consensus of their process of creation, primarily there is a question concerning the origin of the magmas which has built up this chain of islands. The largest contributor to these uncertainties is the continued volcanic activity on older islands, something which does not occur in similar instances of island chains such as Hawaii. Ankaramites are commonly found in the Teno-massif on Tenerife and this rock contains the mineral olivine. Utilising olivine thermometry it is possible to determine the crystallisation temperature, based of the relation between forsterite and fayalite within the olivine crystals. This can in turn indicate if the process took place in temperatures expected in the mantle or lower. Olivine thermometry was conducted on three thin sections of ankaramite and the results indicated a temperature range of 1400-1500 °C, substantially lower than that of previous studies. The likely cause for the discrepancy is the fractional crystallisation and a disequilibrium between the phenocrysts of olivine and pyroxene and the fine-grained mass in between. Additionally, the methodology used did not take into consideration several factors affecting melt- and crystallisation-temperature such as pressure, the fraction of fluids as well as oxygen fugacity.}},
author = {{Patel Grönberg, Joel}},
language = {{swe}},
note = {{Student Paper}},
series = {{Examensarbeten i Geologi vid Lunds universitet}},
title = {{Är vulkanismen på Kanarieöarna till följd av en hetfläck?}},
year = {{2025}},
}