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Journal of the Geological Society; 1999; v. 156; issue.5; p. 865-868;
DOI: 10.1144/gsjgs.156.5.0865
© 1999 Geological Society of London

SPECIAL

Small and short-lived magma batches at composite volcanoes: time windows at Tongariro volcano, New Zealand

B.J. HOBDEN1,2, B.F. HOUGHTON3, J.P. DAVIDSON4 & S. D. WEAVER1

1 Department of Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
3 Institute of Geological & Nuclear Sciences, Private Bag 2000, Taupo, New Zealand
4Department of Earth & Planetary Sciences, University of California, Los Angeles, CA90095–1567, USA

Many are volcanoes are characterized by frequent eruptions of small (<0.1 km3) volume. A key question is do such small events represent discrete magma batches or do these magmas share a partial common history and to what depths? The last 1000 years of eruptions at Tongariro volcano, New Zealand, offer a series of time-calibrated 'snap shots' of an are magmatic system. Complex and abrupt changes in magma chemistry at Tongariro attest to the small size (<1 km3) and short life span (years to decades) of many magma batches and a powerful role for shallow level assimilation, fractional crystallization and mingling in modifying magma compositions on time scales as short as a year.

Key Words: Tongariro volcano • andesite • time scales • magmas • contamination




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