Citation:

0377-8398(83)90008-7

Name: Stable oxygen and carbon isotope ratios of foraminifera from Oligocene to Miocene sediments of DSDP Hole 39-354 from Ceara Rise, West Altlantic (Table 1)
Creator: Milena Biolzi
Published: 1983
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The oxygen- and carbon-isotope compositions of planktic and benthic foraminifera and calcareous nannofossils from Middle Oligocene-Early Miocene Equatorial Atlantic sediments (DSDP Site 354) indicate two important paleoceanographic changes, in the Late Oligocene (foraminiferal Zone P.21) and in the Early Miocene (foraminiferal Zone N.5). The first change, reflected by a delta18O increase of 1.45‰ in Globigerina venezuelana, affected only intermediate pelagic and not surface, deep or bottom waters. The second change affected surface and intermediate waters, whereas deep and bottom waters showed only minor fluctuations. In the case of the former the isotope effect of the moderate ice accumulation on the Antarctic continent is amplified in the Equatorial Atlantic by changes in the circulation pattern. The latter paleoceanographic change, reflected by a significant increase in 18O in both planktic and benthic forms (about 1.0‰ and 0.5‰, respectively), may have been caused by ice volume increase and temperature decrease. Both oxygen- and carbon-isotope compositions indicate a marked depth-habitat stratification for planktic foraminifera and calcareous nannofossils. Three different dwelling groups are recognized: shallow Globigerinoides, Globoquadrina dehiscens, Globorotalia mayeri and nannofossils; intermediate Globigerina venezuelana; and deep Catapsydrax dissimilis. The comparison of foraminifera and calcareous nannofossils suggests that the isotopic compositions of nannofossils are generally controlled by the same parameters which control the isotopic composition of shallow-dwelling foraminifera, but the former are more enriched in 18O.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Latitude: 5.899200 * Longitude: -44.196300

Date/Time Start: 1974-10-27T00:00:00 * Date/Time End: 1974-10-27T00:00:00

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 29

Event(s):

39-354 * Latitude: 5.899200 * Longitude: -44.196300 * Date/Time: 1974-10-27T00:00:00 * Elevation: -4045.0 m * Penetration: 900 m * Recovery: 119 m * Location: North Atlantic/CONT RISE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 211 m cored; 0 m drilled; 56.4 % recovery

Comment:

Analyzed specimens: planktic foraminifera 20-30, benthic foraminifera 5-12

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	ORDINAL NUMBER	Ord No				Geocode
2	Sample code/label	Sample label		Biolzi, Milena	DSDP/ODP/IODP sample designation
3	Planktic foraminifera zone	Plank foram zone		Biolzi, Milena		Zonation of Blow (1969)
4	Globigerina venezuelana, δ18O	G. venezuelana δ18O	‰ PDB	Biolzi, Milena
5	Globigerina venezuelana, δ13C	G. venezuelana δ13C	‰ PDB	Biolzi, Milena
6	Catapsydrax dissimilis, δ18O	C. dissimilis δ18O	‰ PDB	Biolzi, Milena
7	Catapsydrax dissimilis, δ13C	C. dissimilis δ13C	‰ PDB	Biolzi, Milena
8	Globigerinoides ruber, δ18O	G. ruber δ18O	‰ PDB	Biolzi, Milena
9	Globigerinoides ruber, δ13C	G. ruber δ13C	‰ PDB	Biolzi, Milena
10	Globigerinoides trilobus, δ18O	G. trilobus δ18O	‰ PDB	Biolzi, Milena
11	Globigerinoides trilobus, δ13C	G. trilobus δ13C	‰ PDB	Biolzi, Milena
12	Globoquadrina dehiscens, δ18O	G. dehiscens δ18O	‰ PDB	Biolzi, Milena
13	Globoquadrina dehiscens, δ13C	G. dehiscens δ13C	‰ PDB	Biolzi, Milena
14	Globoquadrina globularis, δ18O	G. globularis δ18O	‰ PDB	Biolzi, Milena
15	Globoquadrina globularis, δ13C	G. globularis δ13C	‰ PDB	Biolzi, Milena
16	Globorotalia mayeri, δ18O	G. mayeri δ18O	‰ PDB	Biolzi, Milena
17	Globorotalia mayeri, δ13C	G. mayeri δ13C	‰ PDB	Biolzi, Milena
18	Globorotalia kugleri, δ18O	G. kugleri δ18O	‰ PDB	Biolzi, Milena
19	Globorotalia kugleri, δ13C	G. kugleri δ13C	‰ PDB	Biolzi, Milena
20	Globorotalia opima opima, δ18O	G. opima opima δ18O	‰ PDB	Biolzi, Milena
21	Globorotalia opima opima, δ13C	G. opima opima δ13C	‰ PDB	Biolzi, Milena
22	δ18O, carbonate	δ18O carb	‰ PDB	Biolzi, Milena		mixed nannofossil, < 28 µm
23	δ13C, carbonate	δ13C carb	‰ PDB	Biolzi, Milena		mixed nannofossil, < 28 µm
24	Cibicidoides pseudoungerianus, δ18O	C. pseudoungerianus δ18O	‰ PDB	Biolzi, Milena		for correction disequilibrium (difference to Uvigerina spp.) +0.40 per mil (Boersma and Shackleton, 1977a, b)
25	Cibicidoides pseudoungerianus, δ13C	C. pseudoungerianus δ13C	‰ PDB	Biolzi, Milena		for correction disequilibrium (difference to Uvigerina spp.) -0.76 per mil (N.J. Shackleton, pers. comm. 1982)
26	Globocassidulina subglobosa, δ18O	G. subglobosa δ18O	‰ PDB	Biolzi, Milena		for correction disequilibrium (difference to Uvigerina spp.) +0.10 per mil (Boersma and Shackleton, 1977a, b)
27	Globocassidulina subglobosa, δ13C	G. subglobosa δ13C	‰ PDB	Biolzi, Milena
28	Oridorsalis umbonatus, δ18O	O. umbonatus δ18O	‰ PDB	Biolzi, Milena
29	Oridorsalis umbonatus, δ13C	O. umbonatus δ13C	‰ PDB	Biolzi, Milena
30	Stilostomella spp., δ18O	Stilostomella spp. δ18O	‰ PDB	Biolzi, Milena
31	Stilostomella spp., δ13C	Stilostomella spp. δ13C	‰ PDB	Biolzi, Milena
32	Foraminifera, benthic δ18O	Foram benth δ18O	‰ PDB	Biolzi, Milena
33	Foraminifera, benthic δ13C	Foram benth δ13C	‰ PDB	Biolzi, Milena

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

415 data points

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