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The Cenozoic history of the Lomonosov Ridge; palynology a go go!

The Cenozoic history of the Lomonosov Ridge; palynology a go go!
The Cenozoic history of the Lomonosov Ridge; palynology a go go!
In September 2004, the first-ever drilling of the Lomonosov Ridge (Arctic Coring Expedition, ACEX, aka IODP Expedition 302) recovered unprecedented climate records of the Arctic Ocean spanning the past ~56 Ma. Initial, mainly dinoflagellate based age-assessments include the recognition of some ~200m each of upper Neogene, and middle Paleogene deposits, with a conspicuous ~25 Ma hiatus separating these units. The Neogene record appears one of slow sedimentation rates and frequent glacial conditions – contrasting the Paleogene, which is a story of waxing and waning of freshwater influence, warm conditions, and relatively high accumulation rates of organic-rich sediments.
Paleogene highlights include the early–middle Eocene transition (~50 Ma) yielding stunning concentrations of remains of the freshwater fern Azolla suggesting that at least episodically, completely fresh surface water settings characterized the Arctic Basin. Moreover, although predictions had placed the base of the sediment column at 50 Ma, palynology revealed the successful recovery of the Paleocene–Eocene transition. During this time of super-greenhouse conditions, ~55.5 Ma ago, our records show the Arctic to be subtropical. ACEX also penetrated into some 30m of 'basement', the underlying tectinized sedimentary bedrock. Palynology confirmed the hypothesis that the top of the Lomonosov Ridge 'basement' is of shallow-water origin, and has a Campanian age.
p.10
Geological Society of London
Brinkhuis, H.K.
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Sluijs, A.
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Backman, J.
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Moran, K.
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Eynaud, F.
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King, J.
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Matthiessen, J.
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Takahashi, K.
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Watanabe, M.
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Yamamoto, M.
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Brinkhuis, H.K.
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Sluijs, A.
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Backman, J.
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Moran, K.
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McInroy, D.
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Dickens, G.R.
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Eynaud, F.
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Gattacceca, J.
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Jordan, R.W.
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Kaminski, M.
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King, J.
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Koç, N.
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Martinez, N.C.
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Matthiessen, J.
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Moore, T.C.
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Onodera, J.
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O'Regan, M.
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Pälike, H.
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Sakamoto, T.
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Stein, R.
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Suto, I.
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Suzuki, N.
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Takahashi, K.
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Watanabe, M.
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Yamamoto, M.
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Brinkhuis, H.K., Sluijs, A., Backman, J., Moran, K., McInroy, D., Clemens, S., Cronin, T., Dickens, G.R., Eynaud, F., Gattacceca, J., Jakobsson, M., Jordan, R.W., Kaminski, M., King, J., Koç, N., Martinez, N.C., Matthiessen, J., Moore, T.C., Onodera, J., O'Regan, M., Pälike, H., Rea, B.R., Rio, D., Sakamoto, T., Smith, D.C., Stein, R., St. John, K.E.K., Suto, I., Suzuki, N., Takahashi, K., Watanabe, M. and Yamamoto, M. (2005) The Cenozoic history of the Lomonosov Ridge; palynology a go go! In Palaeoclimate Change: High Latitudes and Ocean Circulation Abstract Volume. Geological Society of London. 27 pp, p.10.

Record type: Conference or Workshop Item (Paper)

Abstract

In September 2004, the first-ever drilling of the Lomonosov Ridge (Arctic Coring Expedition, ACEX, aka IODP Expedition 302) recovered unprecedented climate records of the Arctic Ocean spanning the past ~56 Ma. Initial, mainly dinoflagellate based age-assessments include the recognition of some ~200m each of upper Neogene, and middle Paleogene deposits, with a conspicuous ~25 Ma hiatus separating these units. The Neogene record appears one of slow sedimentation rates and frequent glacial conditions – contrasting the Paleogene, which is a story of waxing and waning of freshwater influence, warm conditions, and relatively high accumulation rates of organic-rich sediments.
Paleogene highlights include the early–middle Eocene transition (~50 Ma) yielding stunning concentrations of remains of the freshwater fern Azolla suggesting that at least episodically, completely fresh surface water settings characterized the Arctic Basin. Moreover, although predictions had placed the base of the sediment column at 50 Ma, palynology revealed the successful recovery of the Paleocene–Eocene transition. During this time of super-greenhouse conditions, ~55.5 Ma ago, our records show the Arctic to be subtropical. ACEX also penetrated into some 30m of 'basement', the underlying tectinized sedimentary bedrock. Palynology confirmed the hypothesis that the top of the Lomonosov Ridge 'basement' is of shallow-water origin, and has a Campanian age.

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More information

Published date: 2005
Venue - Dates: Palaeoclimate Change: High Latitudes and Ocean Circulation, 2005-06-02 - 2005-06-03

Identifiers

Local EPrints ID: 41921
URI: http://eprints.soton.ac.uk/id/eprint/41921
PURE UUID: a5c4f96e-6287-489d-ab09-ceb646426520

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Date deposited: 16 Oct 2006
Last modified: 17 Jul 2017 15:25

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Contributors

Author: H.K. Brinkhuis
Author: A. Sluijs
Author: J. Backman
Author: K. Moran
Author: D. McInroy
Author: S. Clemens
Author: T. Cronin
Author: G.R. Dickens
Author: F. Eynaud
Author: J. Gattacceca
Author: M. Jakobsson
Author: R.W. Jordan
Author: M. Kaminski
Author: J. King
Author: N. Koç
Author: N.C. Martinez
Author: J. Matthiessen
Author: T.C. Moore
Author: J. Onodera
Author: M. O'Regan
Author: H. Pälike
Author: B.R. Rea
Author: D. Rio
Author: T. Sakamoto
Author: D.C. Smith
Author: R. Stein
Author: K.E.K. St. John
Author: I. Suto
Author: N. Suzuki
Author: K. Takahashi
Author: M. Watanabe
Author: M. Yamamoto

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