caa a22 4500 477062369 CHVBK 20180405111404.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/s004450050126 doi (NATIONALLICENCE)springer-10.1007/s004450050126 Mixed deposits of complex magmatic and phreatomagmatic volcanism: an example from Crater Hill, Auckland, New Zealand [Elektronische Daten] [B. F. Houghton, C. J. N. Wilson, M. D. Rosenberg, I. E. M. Smith, R. J. Parker]  A series of alternating phreatomagmatic ("wet") and magmatic ("dry") basaltic pyroclastic deposits forming the Crater Hill tuff ring in New Zealand contains one unit (M1) which can only be interpreted as the products of mixing of ejecta from simultaneous wet and dry explosions at different portions of a multiple vent system. The principal characteristics of M1 are (a) rapid lateral changes in the thicknesses of, and proportions in juvenile components in individual beds, and (b) wide ranges of juvenile clast densities in every sample. M1 appears to have been associated with an elongate source of highly variable and fluctuating magma : water ratios and magma discharge rates. This contrasts with the only other documented mixed (wet and dry) basaltic pyroclastic deposits where mixing from two point sources of quite different but stable character has been inferred. Springer-Verlag Berlin Heidelberg, 1996 Key words Explosive volcanism nationallicence Magmatic nationallicence Phreatomagmatic nationallicence Crater Hill nationallicence Basalt nationallicence Houghton B. F. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut Wilson C. J. N. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut Rosenberg M. D. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut Smith I. E. M. Department of Geology, University of Auckland, Private Bag 92019, Auckland, New Zealand, NZ aut Parker R. J. Department of Geology, University of Auckland, Private Bag 92019, Auckland, New Zealand, NZ aut https://doi.org/10.1007/s004450050126 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450050126 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Houghton B. F. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut NATIONALLICENCE 700 1- Wilson C. J. N. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut NATIONALLICENCE 700 1- Rosenberg M. D. Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand, NZ aut NATIONALLICENCE 700 1- Smith I. E. M. Department of Geology, University of Auckland, Private Bag 92019, Auckland, New Zealand, NZ aut NATIONALLICENCE 700 1- Parker R. J. Department of Geology, University of Auckland, Private Bag 92019, Auckland, New Zealand, NZ aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer