Chlorine degassing constrained by cosmogenic 36Cl and radiocarbon dating of early Holocene rhyodacitic lava domes on Erciyes stratovolcano, central Turkey

Mehmet Akif Sarıkaya, Attila Çiner, Marek G Zreda, Erdal Şen, Orkun Ersoy

Research output: Contribution to journalArticle

Abstract

The Erciyes stratovolcano in central Turkey has several young rhyodacite lava domes that show evidence of clear exposure histories but have hitherto unknown ages. We collected 27 surface samples from three volcanic domes namely Karagüllü Perikartın and Dikkartın for cosmogenic 36Cl dating. The Perikartın eruption generated a pyroclastic flow, which buried trees that were converted to charcoal. The radiocarbon (14C) dating yielded an average age of 9728 ± 110 cal. years B.P. (calibrated using Calib 7.1). We analyzed the cosmogenic 36Cl ages, however, were found that they were probably affected by Cl degassing of the magma. Our study suggests that the radiocarbon age indeed lies between the 0% Cl degassing (6.8 ± 0.5 ka, under nucleogenic 36Cl equilibrium) and the 100% degassing conditions (9.9 ± 0.6 ka, under nucleogenic 36Cl disequilibrium), which implies a partial Cl degassing (93%) during the eruption. This value is somewhat higher than earlier estimates and the difference may result from the miscalculated nucleogenic and/or low-energy neutron production of 36Cl, uncertainties arising from the corrections due to hydrogen-rich cover (i.e., snow) of lava surfaces or due to unconsidered geological complications. Our findings provide a novel approach to estimate the Cl degassing on young lavas and deliver a new evidence of the Holocene volcano-chronology of the central Anatolia.

Original languageEnglish (US)
Pages (from-to)263-275
Number of pages13
JournalJournal of Volcanology and Geothermal Research
Volume369
DOIs
StatePublished - Jan 1 2019

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lava dome
stratovolcano
degassing
Turkey
Degassing
Chlorine
Domes
radiocarbon dating
lava
domes
dating
chlorine
Holocene
volcanic eruptions
volcanic eruption
snow cover
charcoal
Volcanoes
chronology
Charcoal

Keywords

  • Anatolian volcanism
  • Cappadocia
  • Cl degassing
  • Cosmogenic Cl
  • Nucleogenic Cl
  • Radiocarbon

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Chlorine degassing constrained by cosmogenic 36Cl and radiocarbon dating of early Holocene rhyodacitic lava domes on Erciyes stratovolcano, central Turkey. / Sarıkaya, Mehmet Akif; Çiner, Attila; Zreda, Marek G; Şen, Erdal; Ersoy, Orkun.

In: Journal of Volcanology and Geothermal Research, Vol. 369, 01.01.2019, p. 263-275.

Research output: Contribution to journalArticle

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abstract = "The Erciyes stratovolcano in central Turkey has several young rhyodacite lava domes that show evidence of clear exposure histories but have hitherto unknown ages. We collected 27 surface samples from three volcanic domes namely Karag{\"u}ll{\"u} Perikartın and Dikkartın for cosmogenic 36Cl dating. The Perikartın eruption generated a pyroclastic flow, which buried trees that were converted to charcoal. The radiocarbon (14C) dating yielded an average age of 9728 ± 110 cal. years B.P. (calibrated using Calib 7.1). We analyzed the cosmogenic 36Cl ages, however, were found that they were probably affected by Cl degassing of the magma. Our study suggests that the radiocarbon age indeed lies between the 0{\%} Cl degassing (6.8 ± 0.5 ka, under nucleogenic 36Cl equilibrium) and the 100{\%} degassing conditions (9.9 ± 0.6 ka, under nucleogenic 36Cl disequilibrium), which implies a partial Cl degassing (93{\%}) during the eruption. This value is somewhat higher than earlier estimates and the difference may result from the miscalculated nucleogenic and/or low-energy neutron production of 36Cl, uncertainties arising from the corrections due to hydrogen-rich cover (i.e., snow) of lava surfaces or due to unconsidered geological complications. Our findings provide a novel approach to estimate the Cl degassing on young lavas and deliver a new evidence of the Holocene volcano-chronology of the central Anatolia.",
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