(Table 2) Stable carbon and oxygen isotope ratios of foraminifera of DSDP Holes 29-277 and 31-292
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1980
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| _version_ | 1867172317736468480 |
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| author | Keigwin, Lloyd D |
| author_facet | Keigwin, Lloyd D |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Oxygen isotopic studies both of benthic formanifera (Emiliani, 1954, doi:10.1126/science.119.3103.853; Savin et al., 1975, doi:10.1130/0016-7606(1975)86<1499:TMP>2.0.CO;2; Shackleton and Kennett, 1975, doi:10.2973/dsdp.proc.29.117.1975; Savin, 1977, doi:10.1146/annurev.ea.05.050177.001535) and shallow-marine carbonates ( Dorman, 1966; Devereux, 1967; Buchart, 1978, doi:10.1038/275121a0) have provided a useful monitor of marine palaeotemperatures. The Deep Sea Drilling Project (DSDP) has provided cores from many ocean basins to conduct detailed stable isotopic and palaeoceanographic studies of the Cenozoic and late Mesozoic. DSDP Sites 277 and 292, separated by ~60° latitude in Palaeogene times, each record an 18O enrichment in benthic foraminifera of nearly 1 per mil beginning at the Eocene-Oligocene boundary. Planktonic foraminiferal trends are similar to benthic trends in the high latitude southwest Pacific Ocean, but tropical planktonics show only a minor (~0.3 per mil) increase which may reflect a change in seawater composition. These results suggest a sudden cooling of Pacific deep waters and high latitude surface waters forms a useful stratigraphic marker for the Eocene-Oligocene boundary. This boundary is particularly important because of its association with several worldwide palaeo-oceanographic and biogeographic changes. These include a sudden drop in the calcite compensation depth of 1–2 km (van Andel et al., 1975; van Andel, 1975, doi:10.1016/0012-821X(75)90086-2); a decrease in planktonic microfossil diversity (Lipps, 1970, 10.2307/2406711; Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2); a change in planktonic biogeographic patterns (Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2; Haq and Lohmann, 1976, doi:10.1016/0377-8398(76)90008-6); and increased erosion of deep-sea sediments over wide areas (Kennet et al., 1972; Moore et al., 1978). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_770309 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 2) Stable carbon and oxygen isotope ratios of foraminifera of DSDP Holes 29-277 and 31-292 Keigwin, Lloyd D 29-277; 31-292; Antarctic Ocean/PLATEAU; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Globigerina ampliapertura, δ13C; Globigerina ampliapertura, δ18O; Globigerina angiporoides, δ13C; Globigerina angiporoides, δ18O; Glomar Challenger; Isotope ratio mass spectrometry; Leg29; Leg31; North Pacific/Philippine Sea/CONT RISE; Oridorsalis sp., δ13C; Oridorsalis sp., δ18O; Sample code/label Oxygen isotopic studies both of benthic formanifera (Emiliani, 1954, doi:10.1126/science.119.3103.853; Savin et al., 1975, doi:10.1130/0016-7606(1975)86<1499:TMP>2.0.CO;2; Shackleton and Kennett, 1975, doi:10.2973/dsdp.proc.29.117.1975; Savin, 1977, doi:10.1146/annurev.ea.05.050177.001535) and shallow-marine carbonates ( Dorman, 1966; Devereux, 1967; Buchart, 1978, doi:10.1038/275121a0) have provided a useful monitor of marine palaeotemperatures. The Deep Sea Drilling Project (DSDP) has provided cores from many ocean basins to conduct detailed stable isotopic and palaeoceanographic studies of the Cenozoic and late Mesozoic. DSDP Sites 277 and 292, separated by ~60° latitude in Palaeogene times, each record an 18O enrichment in benthic foraminifera of nearly 1 per mil beginning at the Eocene-Oligocene boundary. Planktonic foraminiferal trends are similar to benthic trends in the high latitude southwest Pacific Ocean, but tropical planktonics show only a minor (~0.3 per mil) increase which may reflect a change in seawater composition. These results suggest a sudden cooling of Pacific deep waters and high latitude surface waters forms a useful stratigraphic marker for the Eocene-Oligocene boundary. This boundary is particularly important because of its association with several worldwide palaeo-oceanographic and biogeographic changes. These include a sudden drop in the calcite compensation depth of 1–2 km (van Andel et al., 1975; van Andel, 1975, doi:10.1016/0012-821X(75)90086-2); a decrease in planktonic microfossil diversity (Lipps, 1970, 10.2307/2406711; Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2); a change in planktonic biogeographic patterns (Kennett, 1978, doi:10.1016/0377-8398(78)90017-8; Sancetta, 1979, doi:10.1016/0377-8398(79)90025-2; Haq and Lohmann, 1976, doi:10.1016/0377-8398(76)90008-6); and increased erosion of deep-sea sediments over wide areas (Kennet et al., 1972; Moore et al., 1978). |
| title | (Table 2) Stable carbon and oxygen isotope ratios of foraminifera of DSDP Holes 29-277 and 31-292 |
| topic | 29-277; 31-292; Antarctic Ocean/PLATEAU; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Globigerina ampliapertura, δ13C; Globigerina ampliapertura, δ18O; Globigerina angiporoides, δ13C; Globigerina angiporoides, δ18O; Glomar Challenger; Isotope ratio mass spectrometry; Leg29; Leg31; North Pacific/Philippine Sea/CONT RISE; Oridorsalis sp., δ13C; Oridorsalis sp., δ18O; Sample code/label |
| url | https://doi.org/10.1594/PANGAEA.770309 |