Millimeter-scale profiling of abyssal marine-sediments - role of bioturbation in early sterol diagenesis
Conte, MH; Madureira, LAS; Eglinton, G; Keen, D; Rendall, C
HERO ID
4936628
Reference Type
Journal Article
Year
1994
Language
English
| HERO ID | 4936628 |
|---|---|
| In Press | No |
| Year | 1994 |
| Title | Millimeter-scale profiling of abyssal marine-sediments - role of bioturbation in early sterol diagenesis |
| Authors | Conte, MH; Madureira, LAS; Eglinton, G; Keen, D; Rendall, C |
| Journal | Organic Geochemistry |
| Volume | 22 |
| Issue | 6 |
| Page Numbers | 979-990 |
| Abstract | Near surface sediments from an abyssal northeast Atlantic site were sectioned using a newly designed Precision Core Extruder (PCE). Downcore profiles of excess Pb-210 and sterols showed pronounced millimeter-scale variability reflecting specific degradation and bioturbation processes. Excess Pb-210 and sterol concentrations decreased sharply in the uppermost 5 mm, and pronounced subsurface maxima were present. Stanol/stenol ratios, and the relative abundance of cholesterol, increased below 10 mm, indicating biodegradation involving Delta(5) double bond hydrogenation, C-24 dealkylation and/or de novo synthesis. Sterol profiles indicate that early diagenesis of labile compounds is dominated by processes operating near the sediment/water interface, and that the penetration of labile material into oxic sediments is largely controlled by advective processes, associated with infaunal feeding rather than diffusive-like mixing. |
| Doi | 10.1016/0146-6380(94)90032-9 |
| Wosid | WOS:A1994QT59000007 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | SURFACE SEDIMENTS; STEROLS; BIOTURBATION; EARLY DIAGENESIS; NORTH ATLANTIC; PB-210 |