Paleoceanography

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Zinc concentrations in benthic foraminifera reflect seawater chemistry
Paleoceanography - Tập 15 Số 3 - Trang 299-306 - 2000
Thomas M. Marchitto, William B Curry, Delia W Oppo
We have measured Zn/Ca ratios in two taxa of Holocene‐aged benthic foraminifera from throughout the world's oceans. Zn/Ca is controlled by bottom water dissolved Zn concentration and, like Cd/Ca and Ba/Ca, by bottom water saturation state with respect to calcite. Measurements on “live‐collected” foraminifera suggest that the saturation effect occurs during growth and is not a postdepositio...... hiện toàn bộ
High‐amplitude variations in North Atlantic sea surface temperature during the early Pliocene warm period
Paleoceanography - Tập 24 Số 2 - 2009
K. T. Lawrence, Timothy D. Herbert, Catherine Brown, Maureen E. Raymo, Alan M. Haywood
We provide the first continuous, orbital‐resolution sea surface temperature (SST) record from the high‐latitude North Atlantic, a region critical to understanding the origin of the Plio‐Pleistocene ice ages and proximal to regions that became frequently glaciated after ∼2.7 Ma. We analyzed sediments from Ocean Drilling Program Site 982 over the last 4 Ma for their alkenone unsaturation ind...... hiện toàn bộ
A core top assessment of proxies for the ocean carbonate system in surface‐dwelling foraminifers
Paleoceanography - Tập 22 Số 3 - 2007
Yunyan Ni, Gavin L. Foster, T. R. Bailey, Tim Elliott, Daniela N. Schmidt, Paul N. Pearson, Brian A. Haley, Christopher D. Coath
We have assessed the reliability of several foraminifer‐hosted proxies of the ocean carbonate system (δ11B, B/Ca, and U/Ca) using Holocene samples from the Atlantic and Pacific oceans. We examined chemical variability over a range of test sizes for two surface‐dwelling foraminifers (Globigerinoides sacculifer and ... hiện toàn bộ
Possible roles of pH, temperature, and partial dissolution in determining boron concentration and isotopic composition in planktonic foraminifera
Paleoceanography - Tập 18 Số 4 - 2003
Michael W. Wara, M. L. Delaney, Thomas D. Bullen, Ana Christina Ravelo
We present the first continuous records from 0 to 5 Ma (in 0.333 m.y. integrated time steps) of paired boron/calcium (B/Ca) ratios and boron isotopes (δ11B) in the planktonic foraminifera Globogerinoides sacculifer (without sacc) from a site in the western equatorial Pacific Ocean (Ocean Drilling Program Site 806). These measurements, the fir...... hiện toàn bộ
Vital effects in foraminifera do not compromise the use of δ11B as a paleo‐pH indicator: Evidence from modeling
Paleoceanography - Tập 18 Số 2 - 2003
Richard E. Zeebe, Dieter Wolf‐Gladrow, Jelle Bijma, Bärbel Hönisch
The stable boron isotope composition (δ11B) of fossil foraminiferal shells is used as a paleo‐pH recorder and is therefore one of the most promising paleocarbonate chemistry proxies (“paleoacidimetry”). One crucial question regarding this proxy is whether foraminifera record the pH of the bulk seawater or the ... hiện toàn bộ
Determination of δ18O of Seawater in the Deep Ocean during the Last Glacial Maximum
Paleoceanography - Tập 8 Số 1 - Trang 1-6 - 1993
D. P. Schrag, Donald J. DePaolo
We present a method for determining the δ18O of seawater in the deep ocean during the last glacial maximum from the measured δ18O values of deep sea pore fluids. Using data from Deep Sea Drilling Project (DSDP) site 576 in the Western Pacific, this method yields a glacial to interglacial change in δ18Osw of...... hiện toàn bộ
Miocene isotope reference section, Deep Sea Drilling Project Site 608: An evaluation of isotope and biostratigraphic resolution
Paleoceanography - Tập 6 Số 1 - Trang 33-52 - 1991
Kenneth G. Miller, Mark D. Feigenson, James D. Wright, Bradford M Clement
We developed an isotope (87Sr/86Sr, δ18O) reference section for the uppermost Oligocene to lower upper Miocene (ca. 25–8 Ma) at Site 608 in the northeastern North Atlantic. This site contains the least ambiguous magnetostratigraphic record of Miocene polarity changes available, providing direct correlations to the Geomagnetic P...... hiện toàn bộ
Oligocene‐Miocene strontium isotopes: Stratigraphic revisions and correlations to an inferred glacioeustatic record
Paleoceanography - Tập 9 Số 3 - Trang 427-443 - 1994
Jeffrey S Oslick, Kenneth G. Miller, Mark D. Feigenson, James D. Wright
This study tests and improves on previously published early and middle Miocene 87Sr/86Sr marine correlations, presents Sr isotopic age correlations for this interval using the new timescale of Cande and Kent [1992], and evaluates Sr isotopic changes against an inferred glacioeustatic proxy. We generated a latest Oligocene...... hiện toàn bộ
Evidence from authigenic uranium for increased productivity of the glacial subantarctic ocean
Paleoceanography - Tập 16 Số 5 - Trang 468-478 - 2001
Zanna Chase, Robert F. Anderson, Martin Q. Fleisher
Authigenic uranium is precipitated in reducing sediments and therefore responds both to changes in particulate organic carbon flux to the sediment and to changes in the oxygen concentration of bottom waters. By examining a large number of cores over a wide latitudinal and depth range in the Atlantic sector of the Southern Ocean, we hope to distinguish between a predominantly productivity‐d...... hiện toàn bộ
Reconstruction of paleo–particulate organic carbon fluxes for the Campbell Plateau region of southern New Zealand using the zinc content of sponge spicules
Paleoceanography - Tập 20 Số 3 - 2005
Michael J. Ellwood, Michelle Kelly, Helen L Neil, Scott D. Nodder
The zinc concentration of siliceous sponge spicules was determined from spicules recovered from four sediment cores spanning the last 160 kyr, from the Campbell Plateau region southeast of New Zealand. Zinc/Si results showed little difference between Holocene and glacial aged spicules. An increase in Zn/Si was observed for core Y14, where Zn/Si peaked at about 0.6 μmol/mol during marine is...... hiện toàn bộ
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