| PALEOCEANOGRAPHY |
Miocene-Pliocene Biogenic Bloom Atlantic Paleoproductivity Data
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Diester-Haass, L., K. Billups, and K.C. Emeis. 2005. In search of the late Miocene-early Pliocene "biogenic bloom" in the
Atlantic Ocean (Ocean Drilling Program Sites 982, 925, and 1088). Paleoceanography 20, PA4001.
| Data Coverage |
North: 57.52 * South: -41.13 |
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West: -43.48 * East: 13.57 |
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Altitude: -3042 m |
Start Year: 8943771 14C yr BP
* End Year: 3168480 14C yr BP
Data: Please Cite Data Contributors!
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Summary: We reconstruct paleoproductivity at three sites in the Atlantic Ocean (Ocean Drilling Program Sites 982, 925, and 1088) to
investigate the presence and extent of the late Miocene to early Pliocene "biogenic bloom" from 9 to 3 Ma. Our approach involves
construction of multiple records including benthic foraminiferal and CaCO3 accumulation rates, Uvigerina counts, dissolution
proxies, and geochemical tracers for biogenic and detrital fluxes. This time interval also contains the so-called late Miocene
carbon isotope shift, a well-known decrease in benthic foraminiferal d13C values. We find that the timing of paleoproductivity
maxima differs among the three sites. At Site 982 (North Atlantic), benthic foraminifera and CaCO3 accumulation were both
at a maximum at ~5 Ma, with smaller peaks at ~6 Ma. The paleoproductivity maximum was centered earlier (~6.6-6.0 Ma) in the
tropical Atlantic (Site 925). In the South Atlantic (Site 1088), paleoproductivity increased even earlier, between 8.2 Ma
and 6.2 Ma, and remained relatively high until ~5.4 Ma. We note that there is some overlap between the interval of maximum
productivity between Sites 925 and 1088, as well as the minor productivity increase at Site 982. We conclude that the paleoproductivity
results support hypotheses aiming to place the biogenic bloom into a global context of enhanced productivity. In addition,
we find that at all three sites the d13C shift is accompanied by carbonate dissolution. This observation is consistent with
published studies that have sought a relationship between the late Miocene carbon isotope shift and carbonate preservation.
More Info on Paleoceanography Data |
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Parameters: Depth below surface (cm); Aluminum oxide accumulation rate (mg/cm^2*kyr); Sand(>63 micron) fraction percent; Uvigerina sp. accumulation rate (no./cm^2*kyr); Dry Bulk Density (g/cm^3); radiocarbon years before 1950AD; Titanium oxide weight percent; Barium ppm; Uvigerina sp. per gram; Phosphorus/Aluminum ratio; Barium/Aluminum ratio; Sedimentation rate (cm/kyr); Benthic Foraminifers per gram; Planktonic foraminifers accumulation rate (mg/cm^2*kyr); Aluminum oxide weight percent; Calcium carbonate weight percent; delta O18 PDB (Benthic Foraminifers); Benthic foraminifers accumulation rate (>150um); Fragments percent; Planktonic foraminifers percent; Pyrite fraction percent (>63 micron); Phosphorus oxide weight percent; Benthics to Planktonics+Benthics percent (250-500um); Calcium carbonate mass accumulation rate (g/cm^2/kyr); Paleoproductivity (gC/cm^2*kyr); Benthics to Planktonics+Benthics percent; delta C13 PDB (Benthic Foraminifers); Fragmentation percent (250-500um)
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Complete XML Record: noaa-ocean-2626
(Last Revised: 2009-02-13 )
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