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International Journal of Earth Sciences

, Volume 104, Issue 3, pp 749–751 | Cite as

The Ituwa Surge deposits of the Holocene Ngozi caldera, Mbeya Region, Tanzania

  • Nils Lenhardt
  • Gert-Jan Peeters
  • Athanas S. Macheyeki
GeoSites

The Ituwa Surge deposits belong to the Holocene Ngozi volcano (volcano number 222164 of the Smithsonian Institute Global Volcanism Program; Siebert et al. 2010) of the Rungwe Volcanic Province (RVP; Harkin 1960; Lenhardt and Oppenheimer 2014). They are named after their type locality and place of best exposure, the village of Ituwa in the Mbeya Region of southwestern Tanzania. Volcanism within the RVP started approximately 9 Ma ago and can be divided into a Late Miocene (~9.2–5.4 Ma), a Late Pliocene-Early Pleistocene (~3–1.6 Ma) and a Mid-Pleistocene-recent (<~0.6 Ma) phase (Ebinger et al. 1989, 1993; Ivanov et al. 1999).

The trachytic-to-phonolitic Ngozi volcano contains a 3-km-wide caldera with a 1.5 × 2.75 km lake in the southern part of the caldera. Ngozi lake is the second largest crater lake in Africa. The caldera is bounded by steep-walled cliffs 150–300 m high and could be of Holocene age due to its irregular shape (c.f. Fontijn et al. 2012). Only two of Ngozi’s deposits...

Keywords

Holocene Debris Flow Tephra Late Miocene Pyroclastic Density Current 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Nils Lenhardt
    • 1
  • Gert-Jan Peeters
    • 1
  • Athanas S. Macheyeki
    • 2
  1. 1.Department of GeologyUniversity of PretoriaPretoriaSouth Africa
  2. 2.Geological Survey of TanzaniaMinistry of Energy and MineralsDodomaTanzania

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