The use of biotite trace element compositions for fingerprinting magma batches at Las Cañadas volcano, Tenerife
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Date
2017-01
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
Accurate identification of individual volcanic events in the field is crucial for constraining eruption volumes and calculating recurrence intervals between eruptive episodes. Due to complexities of pyroclastic transport and deposition and intra-unit textural variability, such identification can be challenging. We present a novel method for fingerprinting ignimbrites via trace element chemistry (V, Co, Nb) in biotite by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Using samples from the alkaline magmatic series of Tenerife, we are able to demonstrate (1) clustering of previously characterized units into distinct, homogeneous groups based on V, Co, and Nb concentrations in biotite, despite the presence of extreme variation and zonation in other trace elements (Ba, Sr, Rb) that indicate complex petrogenetic processes, and (2) biotite compositions are similar throughout a deposit and relatively independent of stratigraphic height or juvenile clast texture (crystal-rich vs crystal-poor). Our results show that trace elements in biotite can be used to fingerprint eruptions and correlate geographically separated volcanic deposits, including those preserved in offshore turbidite records.
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published
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Journal / series
Volume
79 (1)
Pages / Article No.
1
Publisher
Springer
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Subject
Stratigraphy; Tenerife; Alkaline magmatism; Trace element chemistry; Biotite
Organisational unit
03958 - Bachmann, Olivier / Bachmann, Olivier
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
Funding
166281 - Understanding eruptive and post-eruptive processes in rhyolites via lithium (Li) isotopes (SNF)