 |
| Titel |
The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean |
| VerfasserIn |
C. J. Hollis, B. R. Hines, K. Littler, V. Villasante-Marcos, D. K. Kulhanek, C. P. Strong, J. C. Zachos, S. M. Eggins, L. Northcote, A. Phillips |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 7 ; Nr. 11, no. 7 (2015-07-31), S.1009-1025 |
| Datensatznummer |
250117363
|
| Publikation (Nr.) |
 copernicus.org/cp-11-1009-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Re-examination of sediment cores from Deep Sea Drilling Project (DSDP) Site
277 on the western margin of the Campbell Plateau (paleolatitude of
~65° S) has identified an intact Paleocene–Eocene
(P–E) boundary overlain by a 34 cm thick record of the Paleocene–Eocene Thermal
Maximum (PETM) within nannofossil chalk. The upper part of the PETM is
truncated, either due to drilling disturbance or a sedimentary hiatus. An
intact record of the onset of the PETM is indicated by a gradual decrease in
δ13C values over 20 cm, followed by a 14 cm interval in which
δ13C is 2 ‰ lighter than uppermost Paleocene values. After
accounting for effects of diagenetic alteration, we use δ18O and
Mg/Ca values from foraminiferal tests to determine that intermediate
and surface waters warmed by ~5–6° at the onset of the PETM
prior to the full development of the negative δ13C excursion. After
this initial warming, sea temperatures were relatively stable through the
PETM but declined abruptly across the horizon that truncates the event at
this site. Mg/Ca analysis of foraminiferal tests indicates peak
intermediate and surface water temperatures of ~19 and
~32 °C, respectively. These temperatures may be influenced by
residual diagenetic factors and changes in ocean circulation, and surface water
values may also be biased towards warm-season temperatures. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|