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New thermoluminescence age estimates for the Nyos maar eruption (Cameroon Volcanic Line)

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1371/journal.pone.0178545

Title data

Schmidt, Christoph ; Tchouankoue, Jean Pierre ; Nkouamen Nemzoue, Peguy Noel ; Ayaba, Félicité ; Nformidah-Ndah, Siggy Signe ; Nformi Chifu, Emmanuel:
New thermoluminescence age estimates for the Nyos maar eruption (Cameroon Volcanic Line).
In: PLOS ONE. Vol. 12 (30 May 2017) Issue 5 . - e0178545.
ISSN 1932-6203
DOI: https://doi.org/10.1371/journal.pone.0178545

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Abstract

Nyos maar is located in the Cameroon Volcanic Line and generates a multitude of primary and secondary hazards to the local population. For risk assessment and hazard mitigation, the age of the Nyos maar eruption provides some vital information. Since previous dating efforts using a range of techniques resulted in vastly varying eruption ages, we applied thermoluminescence (TL) methods to obtain independent and direct chronological constraints for the time of maar formation. Target minerals were granitic quartz clasts contained in pyroclastic surge deposits. Thermoluminescence plateau results prove that heat and/or pressure during the phreatomagmatic eruption was sufficient to reset the inherited luminescence signal of granitic bedrock quartz. Parallel application of three TL measurement protocols to one of the two samples gave consistent equivalent doses for the quartz ultra-violet emission. Despite the robustness of our dose estimates, the assessment of the dose rate was accompanied by methodological challenges, such as estimation of the original size distribution of quartz grains in the pyroclastic deposits. Considering results from additional laboratory analyses to constrain these uncertainties, we calculate an average aximum TL age of 12.3 ± 1.5 ka for the Nyos maar eruption. Based on these new data, a more solid risk assessment can be envisaged.

Further data

Item Type: Article in a journal
Keywords: Luminescence; Thermoluminescence; Volcanic Eruption; Hazard
DDC Subjects: 500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Chair Geomorphology - Univ.-Prof. Dr. Ludwig Zöller
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Geomorphology
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Language: English
Originates at UBT: Yes
Date Deposited: 01 Jun 2017 09:46
Last Modified: 26 Feb 2019 10:55
URI: https://epub.uni-bayreuth.de/id/eprint/3781

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