Present address: Department of Earth Sciences, The University ofWaikato, Private Bag 3105, Hamilton, New Zealand (e-mail: firstname.lastname@example.org)
B.J. HOBDEN, B.F. HOUGHTON, J.P. DAVIDSON, S. D. WEAVER; Small and short-lived magma batches at composite volcanoes: time windows at Tongariro volcano, New Zealand. Journal of the Geological Society ; 156 (5): 865–868. doi: https://doi.org/10.1144/gsjgs.156.5.0865
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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.