Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand
Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits near the base of the cored sedimentary sequence yielded two new ⁴⁰Ar/³⁹Ar dates of 24....
Published in: | Geochemistry, Geophysics, Geosystems |
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AGU (American Geophysical Union)
2015
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Online Access: | https://oceanrep.geomar.de/id/eprint/30201/ https://oceanrep.geomar.de/id/eprint/30201/1/2015%20fox%20wartho%20wilson%20lee%20nelson%20kaulfuss%20Geopchemistry,%20Geophysics,%20Geosystems.pdf https://doi.org/10.1002/2014GC005534 |
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ftoceanrep:oai:oceanrep.geomar.de:30201 2023-05-15T13:40:53+02:00 Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand Fox, B. R. S. Wartho, J.-A. Wilson, G. S. Lee, D. E. Nelson, F. E. Kaulfuss, U. 2015-01 text https://oceanrep.geomar.de/id/eprint/30201/ https://oceanrep.geomar.de/id/eprint/30201/1/2015%20fox%20wartho%20wilson%20lee%20nelson%20kaulfuss%20Geopchemistry,%20Geophysics,%20Geosystems.pdf https://doi.org/10.1002/2014GC005534 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/30201/1/2015%20fox%20wartho%20wilson%20lee%20nelson%20kaulfuss%20Geopchemistry,%20Geophysics,%20Geosystems.pdf Fox, B. R. S., Wartho, J. A. , Wilson, G. S., Lee, D. E., Nelson, F. E. and Kaulfuss, U. (2015) Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand. Geochemistry, Geophysics, Geosystems, 16 (1). pp. 59-76. DOI 10.1002/2014GC005534 <https://doi.org/10.1002/2014GC005534>. doi:10.1002/2014GC005534 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2015 ftoceanrep https://doi.org/10.1002/2014GC005534 2023-04-07T15:21:40Z Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits near the base of the cored sedimentary sequence yielded two new ⁴⁰Ar/³⁹Ar dates of 24.51 ± 0.24 and 23.38 ± 0.24 Ma (2σ). The younger date agrees within error with a previously published ⁴⁰Ar/³⁹Ar date of 23.17 ± 0.19 Ma from a basaltic dyke adjacent to the maar crater. The diatomite is inferred to have been deposited over several tens of thousands of years in the latest Oligocene/earliest Miocene, and may have been coeval with the period of rapid glaciation and subsequent deglaciation of Antarctica known as the Mi-1 event. Sediment magnetic properties and SEM measurements indicate that the magnetic signal is dominated by pseudo-single domain pyrrhotite. The most likely source of detrital pyrrhotite is schist country rock fragments from the inferred tephra ring created by the phreatomagmatic eruption that formed the maar. Variations in magnetic mineral concentration indicate a decrease in erosional input throughout the depositional period, suggesting long-term (tens of thousands of years) environmental change in New Zealand in the latest Oligocene/earliest Miocene. Article in Journal/Newspaper Antarc* Antarctica OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) New Zealand Geochemistry, Geophysics, Geosystems 16 1 59 76 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits near the base of the cored sedimentary sequence yielded two new ⁴⁰Ar/³⁹Ar dates of 24.51 ± 0.24 and 23.38 ± 0.24 Ma (2σ). The younger date agrees within error with a previously published ⁴⁰Ar/³⁹Ar date of 23.17 ± 0.19 Ma from a basaltic dyke adjacent to the maar crater. The diatomite is inferred to have been deposited over several tens of thousands of years in the latest Oligocene/earliest Miocene, and may have been coeval with the period of rapid glaciation and subsequent deglaciation of Antarctica known as the Mi-1 event. Sediment magnetic properties and SEM measurements indicate that the magnetic signal is dominated by pseudo-single domain pyrrhotite. The most likely source of detrital pyrrhotite is schist country rock fragments from the inferred tephra ring created by the phreatomagmatic eruption that formed the maar. Variations in magnetic mineral concentration indicate a decrease in erosional input throughout the depositional period, suggesting long-term (tens of thousands of years) environmental change in New Zealand in the latest Oligocene/earliest Miocene. |
format |
Article in Journal/Newspaper |
author |
Fox, B. R. S. Wartho, J.-A. Wilson, G. S. Lee, D. E. Nelson, F. E. Kaulfuss, U. |
spellingShingle |
Fox, B. R. S. Wartho, J.-A. Wilson, G. S. Lee, D. E. Nelson, F. E. Kaulfuss, U. Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
author_facet |
Fox, B. R. S. Wartho, J.-A. Wilson, G. S. Lee, D. E. Nelson, F. E. Kaulfuss, U. |
author_sort |
Fox, B. R. S. |
title |
Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
title_short |
Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
title_full |
Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
title_fullStr |
Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
title_full_unstemmed |
Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand |
title_sort |
long-term evolution of an oligocene/miocene maar lake from otago, new zealand |
publisher |
AGU (American Geophysical Union) |
publishDate |
2015 |
url |
https://oceanrep.geomar.de/id/eprint/30201/ https://oceanrep.geomar.de/id/eprint/30201/1/2015%20fox%20wartho%20wilson%20lee%20nelson%20kaulfuss%20Geopchemistry,%20Geophysics,%20Geosystems.pdf https://doi.org/10.1002/2014GC005534 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://oceanrep.geomar.de/id/eprint/30201/1/2015%20fox%20wartho%20wilson%20lee%20nelson%20kaulfuss%20Geopchemistry,%20Geophysics,%20Geosystems.pdf Fox, B. R. S., Wartho, J. A. , Wilson, G. S., Lee, D. E., Nelson, F. E. and Kaulfuss, U. (2015) Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand. Geochemistry, Geophysics, Geosystems, 16 (1). pp. 59-76. DOI 10.1002/2014GC005534 <https://doi.org/10.1002/2014GC005534>. doi:10.1002/2014GC005534 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2014GC005534 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
16 |
container_issue |
1 |
container_start_page |
59 |
op_container_end_page |
76 |
_version_ |
1766142719225233408 |