Stable isotope record of benthic and planktonic foraminifera in sediment cores of ODP Leg 177, Southern Ocean
Fuente:
PANGAEA
Enregistré dans:
| Auteurs principaux: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2003
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1867168551944585216 |
|---|---|
| author | Hodell, David A Charles, Christopher D Curtis, Jason H Mortyn, P Graham Ninnemann, Ulysses S Venz, Kathryn A |
| author_facet | Hodell, David A Charles, Christopher D Curtis, Jason H Mortyn, P Graham Ninnemann, Ulysses S Venz, Kathryn A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | While onboard ship during Leg 177, we used variations in sediment physical properties (mainly percent color reflectance) in conjunction with biomagnetostratigraphy to correlate among sites and predict the position of marine isotope stages (MISs) (e.g., see fig. F11 in Shipboard Scientific Party, 1999, p. 45). Our working assumption was that physical properties of Leg 177 sediments are controlled mainly by variations in carbonate content. Previous studies of Southern Ocean sediment cores have shown that carbonate concentrations are relatively high during interglacial stages and low during glacial stages at sites located within the Polar Frontal Zone (PFZ). Today, the PFZ marks a lithologic boundary in underlying sediment separating calcareous oozes to the north and silica-rich facies to the south (Hays et al., 1976). Although there is debate whether the position of the "physical" PFZ actually moved during glacial-interglacial cycles (Charles and Fairbanks, 1990; Matsumoto et al., 2001), the "biochemical" PFZ, as expressed by the CaCO3/opal boundary in sediments, certainly migrated north during glacials and south during interglacials. This gave rise to lithologic variations that are useful for stratigraphic correlation. At Leg 177 sites located north of the PFZ and at sublysoclinal depths, we expected the same pattern of carbonate variation because cores in the Atlantic basin are marked by increased carbonate dissolution during glacial periods and increased preservation during interglacials (Crowley, 1985). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_701432 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope record of benthic and planktonic foraminifera in sediment cores of ODP Leg 177, Southern Ocean Hodell, David A Charles, Christopher D Curtis, Jason H Mortyn, P Graham Ninnemann, Ulysses S Venz, Kathryn A 177-1088B; 177-1089; 177-1090; 177-1093; 177-1094; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg177; Ocean Drilling Program; ODP; PC; Piston corer; South Atlantic Ocean; TN057-6-PC4 While onboard ship during Leg 177, we used variations in sediment physical properties (mainly percent color reflectance) in conjunction with biomagnetostratigraphy to correlate among sites and predict the position of marine isotope stages (MISs) (e.g., see fig. F11 in Shipboard Scientific Party, 1999, p. 45). Our working assumption was that physical properties of Leg 177 sediments are controlled mainly by variations in carbonate content. Previous studies of Southern Ocean sediment cores have shown that carbonate concentrations are relatively high during interglacial stages and low during glacial stages at sites located within the Polar Frontal Zone (PFZ). Today, the PFZ marks a lithologic boundary in underlying sediment separating calcareous oozes to the north and silica-rich facies to the south (Hays et al., 1976). Although there is debate whether the position of the "physical" PFZ actually moved during glacial-interglacial cycles (Charles and Fairbanks, 1990; Matsumoto et al., 2001), the "biochemical" PFZ, as expressed by the CaCO3/opal boundary in sediments, certainly migrated north during glacials and south during interglacials. This gave rise to lithologic variations that are useful for stratigraphic correlation. At Leg 177 sites located north of the PFZ and at sublysoclinal depths, we expected the same pattern of carbonate variation because cores in the Atlantic basin are marked by increased carbonate dissolution during glacial periods and increased preservation during interglacials (Crowley, 1985). |
| title | Stable isotope record of benthic and planktonic foraminifera in sediment cores of ODP Leg 177, Southern Ocean |
| topic | 177-1088B; 177-1089; 177-1090; 177-1093; 177-1094; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg177; Ocean Drilling Program; ODP; PC; Piston corer; South Atlantic Ocean; TN057-6-PC4 |
| url | https://doi.org/10.1594/PANGAEA.701432 |