dc.contributor.author |
Shane, P. |
en |
dc.contributor.author |
Ingraham, N. |
en |
dc.date.accessioned |
2009-08-25T06:03:11Z |
en |
dc.date.available |
2009-08-25T06:03:11Z |
en |
dc.date.issued |
2002 |
en |
dc.identifier.citation |
New Zealand Journal of Geology and Geophysics 45 (4), 453-459. 2002 |
en |
dc.identifier.issn |
0028-8306 |
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dc.identifier.other |
eid=2-s2.0-0036961239 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/4881 |
en |
dc.description |
An open access copy of this article is available from the publishers website. |
en |
dc.description.abstract |
Tephra beds that are well drained and have been buried by thin paleosols become hydrated within 2-3000 yr on reaction with meteoric waters. Hence, the absorbed water within silicic volcanic glass shards provides a potential record of ?D values of ancient meteoric water. Such isotopic records have previously received little investigation. We demonstrate that 1.5-2 m thick tephra beds in central North Island, New Zealand, display uniform ?D values vertically through their profiles and laterally up to 250 m in outcrop. Reproducibility is not influenced by grain size or age of the tephra. We obtained an average ?D value of -48 ᄆ 3ノ for water within the 1.8 ka Taupo Tephra. This is similar to the composition of present-day surface waters. ?D values of -73 ᄆ 2 and -60 ᄆ 2ノ for the 25 ka Kawakawa and 30 ka Mangaone Tephra beds are significantly lower than present waters, indicating that they have been hydrated under different surficial conditions. This is consistent with other proxy paleoclimatic indicators that suggest a cooler, drier, and windier climate at the time of their eruption. Tephra beds are a potential source of paleoclimatic data in terrestrial environments that otherwise may lack proxy records. |
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dc.publisher |
Royal Society Of New Zealand |
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dc.relation.ispartofseries |
New Zealand Journal of Geology and Geophysics |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0028-8306/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.source.uri |
http://www.royalsociety.org.nz/publications/journals/nzjg/2002/027 |
en |
dc.title |
?D values of hydrated volcanic glass: A potential record of ancient meteoric water and climate in New Zealand |
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dc.type |
Journal Article |
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dc.subject.marsden |
Fields of Research::260000 Earth Sciences::260100 Geology |
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pubs.issue |
4 |
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pubs.begin-page |
453 |
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pubs.volume |
45 |
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dc.rights.holder |
Copyright: Royal Society of New Zealand |
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pubs.end-page |
459 |
en |