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Barometry of Clinopyroxene in Xenoliths from the Anaga Region in Tenerife – Constraints on the Magmatic Plumbing System

Bjarkadóttir, Anna Bríet LU (2025) In Dissertations in Geology at Lund University GEOR02 20242
Department of Geology
Abstract
Cumulate xenoliths from beach boulders in Anaga, Tenerife were analyzed through optical microscopy, scanning electron microscopy (SEM), both EDS and EBSD, and barometric modelling to study the magmatic evolution and volcanic plumbing system of the Anaga massif.
Petrographic results indicate crystallization from hydrous basaltic magmas at equilibrium. This was further supported with chemical analysis on the SEM where no systematic chemical variation or zoning was observed. One of the samples studied, sample AN08E is texturally different to the others, leading to a hypothesis of magma resurging throughout its crystallization forming several generations of xenolith in the sample. Additionally, the sample is slightly different chemically as... (More)
Cumulate xenoliths from beach boulders in Anaga, Tenerife were analyzed through optical microscopy, scanning electron microscopy (SEM), both EDS and EBSD, and barometric modelling to study the magmatic evolution and volcanic plumbing system of the Anaga massif.
Petrographic results indicate crystallization from hydrous basaltic magmas at equilibrium. This was further supported with chemical analysis on the SEM where no systematic chemical variation or zoning was observed. One of the samples studied, sample AN08E is texturally different to the others, leading to a hypothesis of magma resurging throughout its crystallization forming several generations of xenolith in the sample. Additionally, the sample is slightly different chemically as it has higher silica composition, which is likely caused by further fractionation of the parental magma. Barometric modelling shows crystallization at around 1-9 kilometer depths which is more complex than previously thought where earlier research shows magma chambers at two distinct depths of less than 5 kilometers and over 30 kilometers. (Less)
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author
Bjarkadóttir, Anna Bríet LU
supervisor
organization
course
GEOR02 20242
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Anaga, Tenerife, Cumulate xenoliths, Petrographic analysis, SEM analysis, Clinopyroxene barometry
publication/series
Dissertations in Geology at Lund University
report number
720
language
English
id
9213756
date added to LUP
2025-10-10 16:00:30
date last changed
2025-10-10 16:00:30
@misc{9213756,
  abstract     = {{Cumulate xenoliths from beach boulders in Anaga, Tenerife were analyzed through optical microscopy, scanning electron microscopy (SEM), both EDS and EBSD, and barometric modelling to study the magmatic evolution and volcanic plumbing system of the Anaga massif. 
Petrographic results indicate crystallization from hydrous basaltic magmas at equilibrium. This was further supported with chemical analysis on the SEM where no systematic chemical variation or zoning was observed. One of the samples studied, sample AN08E is texturally different to the others, leading to a hypothesis of magma resurging throughout its crystallization forming several generations of xenolith in the sample. Additionally, the sample is slightly different chemically as it has higher silica composition, which is likely caused by further fractionation of the parental magma. Barometric modelling shows crystallization at around 1-9 kilometer depths which is more complex than previously thought where earlier research shows magma chambers at two distinct depths of less than 5 kilometers and over 30 kilometers.}},
  author       = {{Bjarkadóttir, Anna Bríet}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{Dissertations in Geology at Lund University}},
  title        = {{Barometry of Clinopyroxene in Xenoliths from the Anaga Region in Tenerife – Constraints on the Magmatic Plumbing System}},
  year         = {{2025}},
}