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Re-evaluation of the Age Model for North Atlantic Ocean Site 982 – Arguments for a Return to the Original Chronology : Volume 9, Issue 5 (25/10/2013)

By Lawrence, K. T.

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Book Id: WPLBN0004006559
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Re-evaluation of the Age Model for North Atlantic Ocean Site 982 – Arguments for a Return to the Original Chronology : Volume 9, Issue 5 (25/10/2013)  
Author: Lawrence, K. T.
Volume: Vol. 9, Issue 5
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Raymo, M. E., Bailey, I., & Lawrence, K. T. (2013). Re-evaluation of the Age Model for North Atlantic Ocean Site 982 – Arguments for a Return to the Original Chronology : Volume 9, Issue 5 (25/10/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Lafayette College, Department of Geology and Environmental Geosciences, 102 Van Wickle Hall, Easton, PA 18042, USA. 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 misidentification of the depth to the Gauss–Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data, and offers a new chronology that includes a hiatus between ~3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ~2.7 Ma 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 no longer exists. 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.

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

Excerpt
Bailey, I., Hole, G. M., Foster, G. L., Wilson, P. A., Storey, C. D., Trueman, C. N., and Raymo, M. E.: An alternative suggestion for the Pliocene onset of major northern hemisphere glaciation based on geochemical provenance of North Atlantic Ocean ice-rafted debris, Quaternary Sci. Rev., 75C, 181–194, <a href=http://dx.doi.org/10.1016/j.quascirev.2013.06.004>doi:10.1016/j.quascirev.2013.06.004, 2013.; Bartoli, G., Sarnthein, M., Weinelt, M., Erlenkeuser, H., Garbe-Schonberg, D., and Lea, D.: Final closure of Panama and the onset of northern hemisphere glaciation, Earth Planet. Sc. Lett., 237, 33–44, 2005.; Bartoli, G., Hoenisch, B., and Zeebe, R. E.: Atmospheric CO2 decline during the Pliocene intensification of Northern Hemisphere Glaciation, Paleoceanography, 26, PA4213, <a href=http://dx.doi.org/10.1029/2010PA002055>doi:10.1029/2010PA002055, 2011.; Baumann, K. H. and Huber, R.: Sea-Surface Gradients Between the North Atlantic and the Norwegian Sea During the Last 3.1 M.Y.: Comparison of Sites 982 and 985, in: Proceedings of the Ocean Drilling Program, Scientific Results, edited by: Raymo, M. E., Jansen, E., Blum, P., and Herbert, T. D., Vol. 162, College Station, Texas, Ocean Drilling Program, 179–190, 1999.; Bolton, C. T., Lawrence, K. T., Gibbs, S. J., Wilson, P. A., and Herbert, T. D.: Biotic and geochemical evidence for a global latitudinal shift in ocean biogeochemistry and export productivity during the late Pliocene, Earth Planet. Sc. Lett., 308, 200–210, 2011.; Channell, J. E. T. and Guyodo, Y.: THe Matuyama Chronozone at ODP 982 (Rockall Bank): Evidence for Decimeter-Scale Magnetization Lock-in Depths, in: Timescales of the Internal Geomagnetic Field, edited by: Channell, J. E. T., Kent, D. V., Lowrie, W., and Meert, J., Vol. 145, AGU Geophysical Monograph, 205–219, 2004.; Channell, J. E. T. and Lehman, B.: Magnetic stratigraphy of North Atlantic Sites 980–984, in: Proceedings of Ocean Drilling Program, Scientific Results, edited by: Raymo, M. E., Jansen, E., Blum, P., and Herbert, T. D., Vol. 162: Colege Station, Texas, Ocean Drilling Program, 113–130, 1999.; Flower, B. P., Oppo, D. W., McManus, J. F., Venz, K. A., Hodell, D. A., and Cullen, J. L.: North Atlantic intermediate to deep water circulation and chemical stratification during the past 1 Myr, Paleoceanography, 15, 388–403, 2000.; Hayashi, T., Ohno, M., Acton, G., Guyodo, Y., Evans, H. F., Kanamatsu, T., Komatsu, F., and Murakami, F.: Millennial-scale iceberg surges after intensification of Northern Hemisphere Glaciation, Geochem. Geophy. Geosys., Qo9Z20, <a href=http://dx.doi.org/10.1029/2010GC003132>doi:10.1029/2010GC003132, 2010.; Khélifi, N., Sarnthein, M., and Naafs, B. D. A.: Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited, Clim. Past, 8, 79–87, <a href=http://dx.doi.org/10.5194/cp-8-79-2012>doi:10.5194/cp-8-79-2012, 2012.; Kleiven, H. F., Jansen, E., Fronval, T., and Smith, T. M.: Intensification of Northern Hemisphere glaciations in the circum Atlantic region (3.5–2.4 Ma) – ice-rafted detritus evidence, Palaeogeogr. Palaeocl., 184, 213–223, 2002.; Lawrence, K. T., Herbert, T. D., Brown, C. M., Raymo, M. E., and Haywood, A. M.: High-amplitude variations in North Atlantic sea surface temperature during the early Pliocene warm Period, Paleoceanography, 24, PA2218, <a href=http://dx.doi.org/10.1029/2008PA001669>doi:10.1029/2008PA001669, 2009.; Lawrence, K. T., Sosdian, S., White, H. E., and Rosenthal, Y.: North Atlantic Climate Evolution Through the Plio-Pleistocene Climate Transitions, Earth Planet. Sc. Lett., 300, 329–342, 2010.; Lisiecki, L. E. and Raymo, M. E.: A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records, Paleoceanography, 20, PA1003, <a href=http://dx.doi.org/10.1029/2004PA001071>doi:10.1029/2004PA001071, 2005.; Naafs, D. A., Hefter


 

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