Geology and age of Solander Volcano, Fiordland, New Zealand

N. Mortimer*, P. B. Gans, F. V. Foley, M. B. Turner, N. Daczko, M. Robertson, I. M. Turnbull

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Solander Islands are the eroded remnants of a once much larger volcanic complex, the only known subduction-related magmatism on the Pacific-Australia plate boundary south of New Zealand. The largest island, Hautere, preserves an eruptive sequence of subaerial adakitic andesite domes and related block and ash flows, followed by a phase of phreatomagmatic deposits. Ar-Ar plagioclase ages, detrital U-Pb zircon ages, and magnetostratigraphic data from Hautere indicate that magmatism probably occurred in the interval 100-350 ka. In contrast, an andesite dome on nearby Little Solander Island gives an age of 20-50 ka. Local hydrothermal activity is manifested as orange-colored alteration and tuffisite dikes. There is no evidence, at least in the small preserved remnants of the Solander Islands, for tectonic uplift or subsidence; most of Solander Volcano was eroded away during Late Pleistocene marine planation.

Original languageEnglish
Pages (from-to)475-487
Number of pages13
JournalJournal of Geology
Volume121
Issue number5
DOIs
Publication statusPublished - Sep 2013

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