Rapid bioturbation in Equatorial Pacific sediments: Evidence from excess super(234)Th measurements

Rapid bioturbation in Equatorial Pacific sediments: Evidence from excess super(234)Th measurements

In order to evaluate bioturbation in Equatorial Pacific sediments, profiles of excess super(234)Th were measured in cores collected during November and December 1992, at six abyssal sites along the JGOFS Equatorial Pacific 140 degree W transect, from 5 degree S to 9 degree N. Excess super(234)Th (ha...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 1996-01, Vol.43 (4-6), p.1339-1364
Hauptverfasser: Pope, R H, Demaster, D J, Smith, C R, Seltmann, H Jr
Format: Artikel
Sprache:eng
Schlagworte:
Marine
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:In order to evaluate bioturbation in Equatorial Pacific sediments, profiles of excess super(234)Th were measured in cores collected during November and December 1992, at six abyssal sites along the JGOFS Equatorial Pacific 140 degree W transect, from 5 degree S to 9 degree N. Excess super(234)Th (half-life = 24.1 days) was detected at all sites. Mean inventories ranged from a low of 0.25 dpm cm super(-2) at 9 degree N, to a high of 2.6 dpm cm super(-2) at 2 degree N. Eddy-diffusive models of the excess super(234)Th profiles suggest that, on 100-day timescales, particle mixing is slow at 5 degree S and 2 degree S (eddy diffusion coefficient, D sub(b),
ISSN:0967-0645