Broecker, Wallace S; Matsumoto, Katsumi; Clark, Elizabeth (1999): (Table 1) Radiocarbon ages of foraminifera from a Piston and a Trigger Weight from Ceara Rise [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856705, Supplement to: Broecker, WS et al. (1999): Radiocarbon age differences between coexisting foraminiferal species. Paleoceanography, 14(4), 431-436, https://doi.org/10.1029/1999PA900019
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Abstract:
Radiocarbon-age measurements on single species of foraminifera from a core on the Ceara Rise demonstrate the importance of the joint effect of bioturbation and variable rain abundance of foraminifera. The relatively high mixed layer ages for Pulleniatina obliquiloculata reflect, at least in part, an early Holocene peak in its abundance while the relatively young ages for Globorotalia menardii reflect the delay until mid Holocene of its reappearance in the Atlantic Ocean. These results clearly demonstrate that core-top sediment samples need not be representative foraminifera falling from today's surface ocean. Rather, at least on the Ceara Rise, such samples consist of a composite of changing species groupings. These results also reconfirm the pitfalls associated with attempts to reconstruct the radiocarbon age of deep ocean water on the basis of benthic-planktonic foraminiferal age differences.
Coverage:
Latitude: 4.000000 * Longitude: -43.000000
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 1.17 m
Comment:
The 14C ages on planktonic foraminifcra have been reservoir-corrected by subtracting 400 years (Bard, 1988) from the measured age, and those on benthic foraminifera have been corrected by subtracting 800 years. The reservoir-age of 800 years for the deep water at the core site is based on the 70/30 mixture of northern and southern source waters, as deduced from the silicate content at Geochemical Ocean Sections Study (GEOSECS) station 40, with initial I4C ages of 550 and 1400 years, respectively. In addition to the ages listed, three others were obtained for the piston core sample from 3 cm depth: Globorotalia tumida, 4350 years; <63 µm CaCO3, 3115 years; and 63-150 µm CaCO3, 3635 years.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Broecker, Wallace S | Geocode | |
| 2 | Core | Core | Broecker, Wallace S | |||
| 3 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | Neogloboquadrina dutertrei |
| 4 | Neogloboquadrina dutertrei | N. dutertrei | #/g | Broecker, Wallace S | ||
| 5 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | Globorotalia menardii |
| 6 | Globorotalia menardii | G. menardii | #/g | Broecker, Wallace S | ||
| 7 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | Globigerinoides sacculifer |
| 8 | Globigerinoides sacculifer | G. sacculifer | #/g | Broecker, Wallace S | ||
| 9 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-400 yr) | Pulleniatina obliquiloculata |
| 10 | Pulleniatina obliquiloculata | P. obliquiloculata | #/g | Broecker, Wallace S | ||
| 11 | Age, dated | Age dated | ka | Broecker, Wallace S | Age, 14C milieu/reservoir corrected (-800 yr) | mixed benthic foraminifera |
| 12 | Foraminifera, benthic | Foram benth | #/g | Broecker, Wallace S |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
128 data points