Abstract
We present results from analyses of the redox-sensitive metals Mo, V, Mn, and Fe in sediment recovered from the Cariaco Basin (Ocean Drilling Program Leg 165, site 1002). Results are interpreted in the context of previous studies of δ15N, export production (percent total organic carbon), eolian input, and hemipelagic deposition in the basin. Variations in redox metal ratios over the past ∼578,000 years were compared to variations in δ18O at Milankovitch frequencies and show a strong relationship between glacial-interglacial cycles in sea level, governed by the shallow sills encircling Cariaco Basin, and bottom water oxygen content. During 100 kyr and 41 kyr cyclicity, enrichments of Mo and V occur during highly productive interglacials, indicating bottom water anoxia. During glacials, sediments are less depleted or enriched in Mn and Fe relative to the interglacials, reflecting oxic conditions. During 23 kyr and 19 kyr cyclicity, however, these redox metal patterns are not observed, indicating that the Cariaco Basin responds differently to the higher-frequency climate changes.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 593-604 |
| Number of pages | 12 |
| Journal | Paleoceanography |
| Volume | 15 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2000 |
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ASJC Scopus subject areas
- Oceanography
- Palaeontology
Cite this
Oxygenation history of bottom waters in the Cariaco Basin, Venezuela, over the past 578,000 years : Results from redox-sensitive metals (Mo, V, Mn, and Fe). / Yarincik, K. M.; Murray, R. W.; Lyons, T. W.; Peterson, Larry C; Haug, G. H.
In: Paleoceanography, Vol. 15, No. 6, 2000, p. 593-604.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Oxygenation history of bottom waters in the Cariaco Basin, Venezuela, over the past 578,000 years
T2 - Results from redox-sensitive metals (Mo, V, Mn, and Fe)
AU - Yarincik, K. M.
AU - Murray, R. W.
AU - Lyons, T. W.
AU - Peterson, Larry C
AU - Haug, G. H.
PY - 2000
Y1 - 2000
N2 - We present results from analyses of the redox-sensitive metals Mo, V, Mn, and Fe in sediment recovered from the Cariaco Basin (Ocean Drilling Program Leg 165, site 1002). Results are interpreted in the context of previous studies of δ15N, export production (percent total organic carbon), eolian input, and hemipelagic deposition in the basin. Variations in redox metal ratios over the past ∼578,000 years were compared to variations in δ18O at Milankovitch frequencies and show a strong relationship between glacial-interglacial cycles in sea level, governed by the shallow sills encircling Cariaco Basin, and bottom water oxygen content. During 100 kyr and 41 kyr cyclicity, enrichments of Mo and V occur during highly productive interglacials, indicating bottom water anoxia. During glacials, sediments are less depleted or enriched in Mn and Fe relative to the interglacials, reflecting oxic conditions. During 23 kyr and 19 kyr cyclicity, however, these redox metal patterns are not observed, indicating that the Cariaco Basin responds differently to the higher-frequency climate changes.
AB - We present results from analyses of the redox-sensitive metals Mo, V, Mn, and Fe in sediment recovered from the Cariaco Basin (Ocean Drilling Program Leg 165, site 1002). Results are interpreted in the context of previous studies of δ15N, export production (percent total organic carbon), eolian input, and hemipelagic deposition in the basin. Variations in redox metal ratios over the past ∼578,000 years were compared to variations in δ18O at Milankovitch frequencies and show a strong relationship between glacial-interglacial cycles in sea level, governed by the shallow sills encircling Cariaco Basin, and bottom water oxygen content. During 100 kyr and 41 kyr cyclicity, enrichments of Mo and V occur during highly productive interglacials, indicating bottom water anoxia. During glacials, sediments are less depleted or enriched in Mn and Fe relative to the interglacials, reflecting oxic conditions. During 23 kyr and 19 kyr cyclicity, however, these redox metal patterns are not observed, indicating that the Cariaco Basin responds differently to the higher-frequency climate changes.
UR - http://www.scopus.com/inward/record.url?scp=0034450358&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034450358&partnerID=8YFLogxK
U2 - 10.1029/1999PA000401
DO - 10.1029/1999PA000401
M3 - Article
AN - SCOPUS:0034450358
VL - 15
SP - 593
EP - 604
JO - Paleoceanography and Paleoclimatology
JF - Paleoceanography and Paleoclimatology
SN - 2572-4517
IS - 6
ER -