@misc{9225037,
  abstract     = {{The Canary Islands, an archipelago in the Atlantic Ocean belonging to Spain and formed
about 25 million years ago, have a complex geological history characterized by intense magmatic activity from an underlying so-called hotspot. Under the hotspot, extraordinarily hot mantle material has been transported up to the base of the lithosphere, which has partially been melted. Tenerife, is one of the best-known islands in the archipelago, was formed about 11–12 million years ago. The island's geological development has been characterized by volcanism, rifting and extensive landslides. The rock ankaramite, a porphyritic and basic gangue rock with a high proportion of phenocrysts (streak grains), occurs here. The magma there has a high density and viscosity. These physical properties should make it difficult for the magma to reach the surface.
There are two main hypotheses that can explain the occurrence of ankaramite as a gangue rock on the surface. The first suggests that new magma filled a magma chamber, which pushed older magma up towards the surface. The second hypothesis is based on the fact that the big landslides that did occur led to a decrease in lithostatic pressure, which in turn allowed the magma to push upwards. There are indications that landslides occurred at about the same time as the ankaramites formed. The possibility of determining the exact time is made difficult by the lack of reliable geochronological dating methods.
The aim of this study has been to conduct a petrographic and petrological investigation of anchoramite from Tenerife. The petrographic analysis focused on the composition and texture of the rock, while the petrological part aimed to shed light on the possible formation processes.
The results of the petrographic analysis showed that the ankaramite consists of approximately 48% matrix and 52% phenocrysts, of which 30% is olivine and 22% is clinopyroxene. A clear difference could be noted between the olivine in the hand sample and in the thin section: in the hand sample the olivine was heavily transformed to iddingsite, while only partial transformation was seen in the thin section, limited to the edges of the crystals. In addition, some zoning was noted in the olivine. The differences are assumed to be due to the samples coming from different parts of the same rift zone.}},
  author       = {{Corshammar, Johannes}},
  language     = {{swe}},
  note         = {{Student Paper}},
  series       = {{Examensarbeten i geologi vid Lunds universitet}},
  title        = {{Petrologisk-petrografisk studie av ankaramit-bergarter på Teneriffa}},
  year         = {{2026}},
}