A unique annually laminated maar lake sediment record shows orbital control of Southern Hemisphere midlatitude climate across the Oligocene-Miocene boundary

B. R.S. Fox, G. S. Wilson, D. E. Lee

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The Foulden Maar deposit, a finely laminated lacustrine diatomite from the South Island of New Zealand, is the first high-resolution Oligocene-Miocene terrestrial climate record from the midlatitudes of the Southern Hemisphere. We use the presence of orbital and solar cycles within the physical properties records from the deposit to infer that the laminations are annual varves and that the deposit spans ~100 k.y. When combined with magnetostratigraphy and 40Ar/39Ar data, we can assign the diatomite to chron C6Cn.2n (23.033-22.931 Ma), coeval with the rapid deglaciation of Antarctica during the second half of the Mi-1 transient glaciation event. Both obliquity and precession cycles occur in the physical properties records from the site, indicating a strong ocean-atmosphere coupling in the Southern Hemisphere and influence from both low and high latitudes. The appearance of a strong obliquity component, in particular, may indicate a transient incursion of the Subtropical Front onto the Campbell Plateau during the Mi-1 deglaciation.

LanguageEnglish
Pages609-626
Number of pages18
JournalBulletin of the Geological Society of America
Volume128
Issue number3-4
DOIs
Publication statusPublished - 1 Mar 2016
Externally publishedYes

Fingerprint

maar
Southern Hemisphere
lacustrine deposit
Oligocene
diatomite
obliquity
Miocene
deglaciation
climate
physical property
atmosphere-ocean coupling
varve
magnetostratigraphy
lamination
precession
solar cycle
glaciation
plateau

Cite this

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abstract = "The Foulden Maar deposit, a finely laminated lacustrine diatomite from the South Island of New Zealand, is the first high-resolution Oligocene-Miocene terrestrial climate record from the midlatitudes of the Southern Hemisphere. We use the presence of orbital and solar cycles within the physical properties records from the deposit to infer that the laminations are annual varves and that the deposit spans ~100 k.y. When combined with magnetostratigraphy and 40Ar/39Ar data, we can assign the diatomite to chron C6Cn.2n (23.033-22.931 Ma), coeval with the rapid deglaciation of Antarctica during the second half of the Mi-1 transient glaciation event. Both obliquity and precession cycles occur in the physical properties records from the site, indicating a strong ocean-atmosphere coupling in the Southern Hemisphere and influence from both low and high latitudes. The appearance of a strong obliquity component, in particular, may indicate a transient incursion of the Subtropical Front onto the Campbell Plateau during the Mi-1 deglaciation.",
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T1 - A unique annually laminated maar lake sediment record shows orbital control of Southern Hemisphere midlatitude climate across the Oligocene-Miocene boundary

AU - Fox, B. R.S.

AU - Wilson, G. S.

AU - Lee, D. E.

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N2 - The Foulden Maar deposit, a finely laminated lacustrine diatomite from the South Island of New Zealand, is the first high-resolution Oligocene-Miocene terrestrial climate record from the midlatitudes of the Southern Hemisphere. We use the presence of orbital and solar cycles within the physical properties records from the deposit to infer that the laminations are annual varves and that the deposit spans ~100 k.y. When combined with magnetostratigraphy and 40Ar/39Ar data, we can assign the diatomite to chron C6Cn.2n (23.033-22.931 Ma), coeval with the rapid deglaciation of Antarctica during the second half of the Mi-1 transient glaciation event. Both obliquity and precession cycles occur in the physical properties records from the site, indicating a strong ocean-atmosphere coupling in the Southern Hemisphere and influence from both low and high latitudes. The appearance of a strong obliquity component, in particular, may indicate a transient incursion of the Subtropical Front onto the Campbell Plateau during the Mi-1 deglaciation.

AB - The Foulden Maar deposit, a finely laminated lacustrine diatomite from the South Island of New Zealand, is the first high-resolution Oligocene-Miocene terrestrial climate record from the midlatitudes of the Southern Hemisphere. We use the presence of orbital and solar cycles within the physical properties records from the deposit to infer that the laminations are annual varves and that the deposit spans ~100 k.y. When combined with magnetostratigraphy and 40Ar/39Ar data, we can assign the diatomite to chron C6Cn.2n (23.033-22.931 Ma), coeval with the rapid deglaciation of Antarctica during the second half of the Mi-1 transient glaciation event. Both obliquity and precession cycles occur in the physical properties records from the site, indicating a strong ocean-atmosphere coupling in the Southern Hemisphere and influence from both low and high latitudes. The appearance of a strong obliquity component, in particular, may indicate a transient incursion of the Subtropical Front onto the Campbell Plateau during the Mi-1 deglaciation.

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