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The enigmatic origin and emplacement of the Samosir Island lava domes, Toba Caldera, Sumatra, Indonesia

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Abstract

The 60 × 20-km Samosir resurgent dome within the 74-ka Toba Caldera features several clusters of rhyolitic lava domes. Because the previously known Tuk-Tuk and Samosir Fault lava domes occur near the base of a major resurgent dome fault, they appear associated with resurgent uplift, and dating them could provide constraints on the timing of resurgence. Towards that goal, we mapped and sampled the Tuk-Tuk and Samosir Fault lava domes, discovered two additional lava dome clusters in the uplifted interior of Samosir Island, then determined modal mineralogy, major and trace element geochemistry, and 40Ar/39Ar sanidine ages on several samples from each cluster. These quartz-bearing rhyolite lava domes have SiO2 contents ranging from ~ 70-76 wt%, crystallinities of 28-54%, and 40Ar/39Ar ages (~ 74-76 ka) that overlap with those of the Youngest Toba Tuff (YTT), ~ 74-75 ka. Our field observations and the remarkable similarity in mineralogy, geochemistry, and ages among the dome clusters and YTT support the interpretation that these domes represent remnant YTT magma that erupted shortly after the climactic YTT eruption. Later, during resurgence, these pre-resurgent lava domes were uplifted to their present locations, some near current lake level, others up to 440 m above lake level.

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Acknowledgments

We would like to thank the EIU students that assisted with field and laboratory work on the Samosir lava domes, including Mike Dolan, Brad Sporleder, Del Bohnenstiehl, and Patrick Manselle. Field logistics were arranged by Indyo Pratomo, Gagarin Sembiring, and Gustam Lubis. David Karatson and an anonymous reviewer provided constructive reviews of this manuscript.

Funding

Funding for this study was provided by several small grants from Eastern Illinois University.

Author information

Correspondence to Craig A. Chesner.

Additional information

Editorial responsibility: R.J. Brown

Electronic supplementary material

ESM 1

Samosir lava dome modal analyes (XLSX 12 kb)

ESM 2

Samosir lava dome major and trace analyses (XLSX 21 kb)

ESM 3A

40Ar/39Ar sanidine analyses and complete data (XLSX 632 kb)

ESM 3B

40Ar/39Ar sanidine spectra and ideograms (PDF 353 kb)

ESM 4A

40Ar/39Ar biotite and hornblende analyses and complete data (XLSX 311 kb)

ESM 4B

40Ar/39Ar biotite and hornblende spectra (PDF 130 kb)

ESM 5

Radiocarbon ages (XLSX 10 kb)

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Chesner, C.A., Barbee, O.A. & McIntosh, W.C. The enigmatic origin and emplacement of the Samosir Island lava domes, Toba Caldera, Sumatra, Indonesia. Bull Volcanol 82, 26 (2020). https://doi.org/10.1007/s00445-020-1359-9

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Keywords

  • Super-eruption
  • Resurgent caldera
  • Rhyolite
  • 40Ar/39Ar
  • Caldera lake sediments