 |
| Titel |
Re-evaluation of the age model for North Atlantic Ocean Site 982 – arguments for a return to the original chronology |
| VerfasserIn |
K. T. Lawrence, I. Bailey, M. E. Raymo |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 5 ; Nr. 9, no. 5 (2013-10-25), S.2391-2397 |
| Datensatznummer |
250085237
|
| Publikation (Nr.) |
 copernicus.org/cp-9-2391-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|