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Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology

Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology
Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent mis-identification of the depth to the Gauss-Matuyama (G/M) polarity chronozone reversal boundary (2.581Ma) based on preliminary shipboard paleomagnetic data and offers a new chronology which includes a hiatus between ?3.2 and 3Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ?2.7Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology is not valid. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age-model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982.
1814-9332
2391-2397
Lawrence, K.T.
2599fed9-2703-4d9a-97b9-3e392c1ca367
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Raymo, M.E.
244bec37-8d84-4bed-bd32-d1b38d326ce4
Lawrence, K.T.
2599fed9-2703-4d9a-97b9-3e392c1ca367
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Raymo, M.E.
244bec37-8d84-4bed-bd32-d1b38d326ce4

Lawrence, K.T., Bailey, Ian and Raymo, M.E. (2013) Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology. Climate of the Past, 9, 2391-2397. (doi:10.5194/cp-9-2391-2013).

Record type: Article

Abstract

Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent mis-identification of the depth to the Gauss-Matuyama (G/M) polarity chronozone reversal boundary (2.581Ma) based on preliminary shipboard paleomagnetic data and offers a new chronology which includes a hiatus between ?3.2 and 3Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ?2.7Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology is not valid. We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age-model than that which arises from the published revision. We strongly recommend the use of the original chronology for all future work at Site 982.

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Published date: 25 October 2013
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 352114
URI: https://eprints.soton.ac.uk/id/eprint/352114
ISSN: 1814-9332
PURE UUID: 70d3dbaf-82fb-4d59-8d3c-ae81f6c2c448

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Date deposited: 02 May 2013 11:58
Last modified: 18 Jul 2017 04:18

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