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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5597

Authors: Venuti, A.*
Verosub, K. L.*
Title: Paleomagnetic record of basaltic volcanism from Pukaki and Onepoto maar lake cores, Auckland Volcanic Field, New Zealand
Title of journal: New Zealand Journal of Geology and Geophysics
Publisher: Royal Society of New Zealand
Issue Date: 2009
Keywords: Environmental magnetism
Pukaki
Onepoto
Auckland Volcanic Field
maars
ash deposits
Abstract: The Auckland Volcanic Field contains several maars that formed after the last interglacial and subsequently filled with sediment. Two of these maars, Pukaki and Onepoto, were recently cored as part of the Auckland Maar Lakes Project. The tephra stratigraphy of the cores indicates that sediment accumulated relatively slowly in both maars until the Holocene when ocean waters breached the craters and they filled up quite rapidly. Using u-channels, we collected 23 m of pre-Holocene lacustrine sediment from the Pukaki 1-01 core and 15 m from the Onepoto core. Paleomagnetic measurements were performed on these at the University of California, Davis. Environmental magnetic records from both cores provide insights in particular about the eruptive history of the Auckland Volcanic Field. The lack of a tephrostratigraphic control in the lower portion of the cores, and the lack of similar trends in the magnetic parameters, prevented a complete core correlation. The main finding is that local basaltic tephra layers visible in the cores show up as spikes in the concentration dependent magnetic parameters, suggesting that other spikes represent tephra layers that are not as easily discerned.
Appears in Collections:04.05.09. Environmental magnetism
04.08.08. Volcanic risk
Papers Published / Papers in press

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