Unravelling a complex volcanic history from fine-grained, intricate Holocene ash sequences at the Tongariro Volcanic Centre, New Zealand

Publication year: 2011
Source: Quaternary International, In Press, Accepted Manuscript, Available online 13 June 2011

Anja, Moebis , Shane J., Cronin , Vincent E., Neall , Ian E., Smith

Holocene volcanism at the Tongariro Volcanic Centre (TgVC), at the south-western end of the Taupo Volcanic Zone (TVZ), New Zealand, involved eruptions from at least three centres and was dominated by numerous “small” eruptions of VEI 1-4. These produced very thin, grey to black, fine to coarse ash deposits of basaltic andesite to andesitic composition. Being unable to uniquely recognise and correlate these deposits presented a challenge in documenting the complete eruption record from the TgVC and to distinguish the periods of activity associated with each centre. Previous studies combined fine and poorly distinguishable tephras into mappable formations comprising many…