983 Works

Geochemistry on interstitial water of 5 sediment profiles from the Persian Gulf, supplement to: de Groot, K (1973): Geochemistry of tidal flat brines at Umm Said, SE Quatar, Persian Gulf. In: Purser, B H; The Persian Gulf, Holocene carbonate sedimentation and diagenesis in a shallow epicontiental sea. Springer-Verlag, Berlin, 377-394

K de Groot
The landward part of the 7 km wide sabkha at Umm Said, SE Qatar, is filled with a stagnant brine virtually saturated with halite. Recent dolomite occurs in the sabkha sediments, the quantity being fully accounted for by the amount of Mg++ ions lost from the interstitial brine.The existence of a reflux system in the seaward parts of the sabkha was established. It was not, however, possible to gi ve any unequivocal demonstration of the...

Neogene diatoms from the western Antarctic Peninsula, supplement to: Iwai, Masao; Winter, Diane M (2002): Data report: Taxonomic notes of Neogene diatoms from the western Antarctic peninsula: Ocean Drilling Program Leg 178. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-57

Masao Iwai & Diane M Winter
During Ocean Drilling Program Leg 178 we cored nine sites on the continental rise (Sites 1095, 1096, and 1101), continental shelf (Sites 1097, 1100, 1102, and 1103), and in an inner shelf basin, Palmer Deep (Sites 1098 and 1099), along the Pacific margin of the Antarctic Peninsula. Fossil diatoms are a key group that provides age constraint for these shelf site sediments to allow reconstruction of Antarctic Peninsula glacial history. This paper provides the systematic...

Diatom abundance in ODP Leg 178 holes, supplement to: Winter, Diane M; Iwai, Masao (2002): Data report: Neogene diatom biostratigraphy, Antarctic Peninsula Pacific margin, ODP Leg 178 rise sites. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-25

Diane M Winter & Masao Iwai
This paper documents the biostratigraphic distribution and abundance of diatoms from sites drilled during Ocean Drilling Program Leg 178, off the Pacific margin of the Antarctic Peninsula. Drift sediments cored on the continental rise at Sites 1095, 1096, and 1101 have good recovery and a well-defined paleomagnetic record. Well-preserved diatoms are present throughout the upper Miocene to middle Pliocene and in the upper Quaternary section of these sites. The stratigraphic occurrence of diatom species through...

Ice thickness measurements in the Lincoln Sea and adjacent Arctic Ocean, supplement to: Haas, Christian; Hendricks, Stefan; Doble, M (2006): Comparison of the sea ice thickness distribution in the Lincoln Sea and adjacent Arctic Ocean in 2004 and 2005. Annals of Glaciology, 44(1), 247-252

Christian Haas, Stefan Hendricks & M Doble
Results of helicopter-borne electromagnetic measurements of total (ice plus snow) sea-ice thickness performed in May 2004 and 2005 in the Lincoln Sea and adjacent Arctic Ocean up to 86° N are presented. Thickness distributions south of 84° N are dominated by multi-year ice with modal thicknesses of 3.9 m in 2004 and 4.2 m in 2005 (mean thicknesses 4.67 and 5.18 m, respectively). Modal and mean snow thickness on multi-year ice amounted to 0.18 and...

Calcareous nannofossils, pollen and spores from ODP Leg 178 sites, supplement to: Iwai, Masao; Kameo, Koji; Miyake, N (2001): Calcareous nannofossils, pollen, and spores from Leg 178 Sites 1095, 1097, 1100, and 1103, western Antarctic Peninsula: age constraints and environmental implications. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-22

Masao Iwai, Koji Kameo & N Miyake
Calcareous nannofossils, pollen, and spores were examined on samples from Ocean Drilling Program Leg 178 Site 1095 on the continental rise and Sites 1097, 1100, and 1103 on the outer continental shelf of the western Antarctic Peninsula. Stratigraphically useful specimens of calcareous nannofossils occur in Site 1095 sediments assigned to Zones CN15, CN13b, and CN11. Calcareous nannofossils are rare but occur throughout the sedimentary sequences from seismic Units S1 to S3 on the continental shelf....

Reconstruction of sea-surface temperatures from asseblages of planktonic foraminifera, supplement to: Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Stephen; Waelbroeck, Claire (2005): Reconstruction of sea-surface temperatures from assemblages of planktonic foraminifera: multi-technique approach based on geographically constrained calibration datasets and its application to glacial Atlantic and Pacific Oceans. Quaternary Science Reviews, 24(7-9), 951-998

Michal Kucera, Mara Weinelt, Thorsten Kiefer, Uwe Pflaumann, Angela Hayes, Martin Weinelt, Min-Te Chen, Alan C Mix, Timothy T Barrows, Elsa Cortijo, Josette M Duprat, Stephen Juggins & Claire Waelbroeck
We present a conceptual framework for a new approach to environmental calibration of planktonic foraminifer census counts. This approach is based on simultaneous application of a variety of transfer function techniques, which are trained on geographically constrained calibration data sets. It serves to minimise bias associated with the presence of cryptic species of planktonic foraminifera and provides an objective tool for assessing reliability of environmental estimates in fossil samples, allowing identification of adverse effects of...

Carbon cycle change in the Eocene, supplement to: Tripati, Aradhna K; Backman, Jan; Elderfield, Henry; Ferretti, Patrizia (2005): Eocene bipolar glaciation associated with global carbon cycle changes. Nature, 436, 341-346

Aradhna K Tripati, Jan Backman, Henry Elderfield & Patrizia Ferretti
The transition from the extreme global warmth of the early Eocene 'greenhouse' climate ~55 million years ago to the present glaciated state is one of the most prominent changes in Earth's climatic evolution. It is widely accepted that large ice sheets first appeared on Antarctica ~34 million years ago, coincident with decreasing atmospheric carbon dioxide concentrations and a deepening of the calcite compensation depth in the world's oceans, and that glaciation in the Northern Hemisphere...

Chemistry of sediment profile GeoB4906, supplement to: Pfeifer, Kerstin; Hensen, Christian; Adler, M; Wenzhöfer, Frank; Weber, Bettina; Schulz, Horst D (2002): Modeling of subsurface calcite dissolution - including the respiration and re-oxidation processes of marine sediments in the region of equatorial upwelling off Gabon. Geochimica et Cosmochimica Acta, 66(24), 4247-4259

Kerstin Pfeifer, Christian Hensen, M Adler, Frank Wenzhöfer, Bettina Weber & Horst D Schulz
Mineralization of organic matter and the subsequent dissolution of calcite were simulated for surface sediments of the upper continental slope off Gabon by using microsensors to measure O2, pH, pCO2 and Ca2+ (in situ), pore-water concentration profiles of NO3-, NH4+, Fe2+, and Mn2+ and SO42- (ex situ), as well as sulfate reduction rates derived from incubation experiments. The transport and reaction model CoTReM was used to simulate the degradation of organic matter by O2, [NO3]-,...

Age models for ODP Leg 172 sites, supplement to: Gruetzner, Jens; Giosan, Liviu; Franz, Sven-Oliver; Tiedemann, Ralf; Cortijo, Elsa; Chaisson, William P; Flood, Roger D; Hagen, Sveinung; Keigwin, Lloyd D; Poli, Maria-Serena; Rio, Domenico; Williams, Trevor (2002): Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055-1063). Marine Geology, 189(1-2), 5-23

Jens Gruetzner, Liviu Giosan, Sven-Oliver Franz, Ralf Tiedemann, Elsa Cortijo, William P Chaisson, Roger D Flood, Sveinung Hagen, Lloyd D Keigwin, Maria-Serena Poli, Domenico Rio & T Williams
Ten ODP sites drilled in a depth transect (2164-4775 m water depth) during Leg 172 recovered high-deposition rate (>20 cm/kyr) sedimentary sections from sediment drifts in the western North Atlantic. For each site an age model covering the past 0.8-0.9 Ma has been developed. The time scales have a resolution of 10-20 kyr and are derived by tuning variations of estimated carbonate content to the orbital parameters precession and obliquity. Based on the similarity in...

Stable isotope record and composition of planktonic foraminifera from ODP Site 172-1056, supplement to: Chaisson, William P; Poli, Maria-Serena; Thunell, Robert C (2002): Gulf Stream and Western Boundary Undercurrent variations during MIS 10-12 at Site 1056, Blake-Bahama Outer Ridge. Marine Geology, 189(1-2), 79-105

William P Chaisson, Maria-Serena Poli & Robert C Thunell
The stable isotopic composition of two planktonic foraminifer species (Globigerinoides sacculifer and Neogloboquadrina dutertrei) and two benthic foraminifer species (Cibicidoides wuellerstorfi and Uvigerina peregrina) was measured at sub-orbital resolution through the marine isotope stages (MISs) 10, 11, and 12 (345-460 ka) at Site 1056 on the Blake-Bahama Outer Ridge. Planktonic foraminifers were counted for the interval 405-450 ka at 2-4-kyr resolution. Site 1056 (32°29'N, 76°20'W) is located on the continental slope (water depth: 2167 m)...

X-ray analysis of sediment cores from cruise MD-01

David Van Rooij, Thomas Richter, Dominique Blamart & Audrey Lutringer
Tis datasets presents X-ray analysis of sediment cores from cruise MD-01.

Sea surface temperature estimation of sediment core 86014-12PC51, supplement to: Sikes, Elisabeth L; Keigwin, Lloyd D (1994): Equatorial Atlantic sea surface temperature for the last 30 kyr: A comparison of Uk37, d18O and foraminiferal assemblage temperature estimates. Paleoceanography, 9(1), 31-46

Elisabeth L Sikes & Lloyd D Keigwin
A recently developed technique for determining past sea surface temperatures (SST), based on an analysis of the unsaturation ratio of long chain C37 methyl alkenones produced by Prymnesiophyceae phytoplankton (U37 k' ), has been applied to an upper Quaternary sediment core from the equatorial Atlantic. U37 k' temperature estimates were compared to those obtained from delta18O of the planktonic foraminifer Globigerinoides sacculifer and of planktonic foraminiferal assemblages for the last glacial cycle. The alkenone method...

Age deterimation of sediment cores from the Atlantic Ocean, supplement to: Vidal, Laurence; Schneider, Ralph R; Marchal, Olivier; Bickert, Torsten; Stocker, Thomas F; Wefer, Gerold (1999): Link between the North and South Atlantic during the Heinrich events of the last galcial period. Climate Dynamics, 15(12), 909-919

Laurence Vidal, Ralph R Schneider, Olivier Marchal, Torsten Bickert, Thomas F Stocker & Gerold Wefer
High resolution benthic oxygen isotope records combined with radiocarbon datings, from cores retrieved in the North, Equatorial, and South Atlantic are used to establish a reliable cronostratigraphy for the last 60 ky. This common temporal framework enables us to study the timing of the sub-Milankovitch climate variability in the entire surface Atlantic during this period, as reflected in planktonic oxygen isotope records. Variations in sea surface temperatures in the Equatorial and South Atlantic reveal two...

Pollen analyses of sediment core GeoB1711-4 in the eastern South Atlantic, supplement to: Shi, Ning; Schneider, Ralph R; Beug, Hans-Jürgen; Dupont, Lydie M (2001): Southeast trade wind variations during the last 135 kyr: evidence from pollen spectra in eastern South Atlantic sediments. Earth and Planetary Science Letters, 187(3-4), 311-321

Ning Shi, Ralph R Schneider, Hans-Jürgen Beug & Lydie M Dupont
Influx of aeolian pollen trapped in marine sediments off Namibia provides a wind variation record for the last 135 kyr. The influx of major pollen components is derived from the southwest African desert/semi-desert zone and shows six periods during which enhanced southeast trade winds contributed to strong upwelling and reduced sea surface temperatures. The most prominent of these occurred during 17-23 cal. kyr, 42-56 kyr and before 130 kyr B.P. Correspondence between the pollen influx...

Age determination of sediment cores from the Weddell Sea, supplement to: Anderson, John B; Andrews, John T (1999): Radiocarbon constrains on ice sheet advance and retreat in the Weddell Sea, Antarctica. Geology, 27(2), 179-182

John B Anderson & John T Andrews
We report here the results of a study aimed at providing radiometric age control on glacial events in the Weddell Sea during the late Quaternary. Sediment cores from the eastern continental shelf, where the East Antarctic ice sheet was grounded, have recovered glacial-marine sediments resting on tills and the latter deposits predate the isotope stage 2 last glacial maximum. Sediment cores from the continental slope and rise sampled a prominent ice-rafted debris layer, and radiocarbon...

Late Quaternary sediment accumulation in the Baffin Bay, supplement to: Andrews, John T (1987): Late Quaternary marine sediment accumulation in fjord-shelf-deep-sea transects, Baffin Island to Baffin Bay. Quaternary Science Reviews, 6(3-4), 231-243

John T Andrews
Piston cores from fiords, shelf troughs, and the deep-sea off eastern Baffin Island, N.W.T., Canada, have been sampled for texture and detrital carbonate in the <2 mm fraction. The sediments consist primarily of silty clays usually containing <5% sand. Estimates are made for sediment accumulation (kg/m**2/ka) over the last ca. 10 ka. Three sets, of two cores each, lie on a fiord-shelf transect and thus define variations in sediment accumulation gradients. These continental margin data...

Nd, Pb, and Be isotopes of ferromanaganese crusts of the South Pacific, supplement to: van de Flierdt, Tina; Frank, Martin; Halliday, Alex N; Hein, James R; Hattendorf, Bodo; Günther, Detlef; Kubik, Peter W (2004): Deep and bottom water export from the Southern Ocean to the Pacific Ocean over the past 38 million years. Paleoceanography, 19(1), PA1020

Tina van de Flierdt, Martin Frank, Alex N Halliday, James R Hein, Bodo Hattendorf, Detlef Günther & Peter W Kubik
The application of radiogenic isotopes to the study of Cenozoic circulation patterns in the South Pacific Ocean has been hampered by the fact that records from only equatorial Pacific deep water have been available. We present new Pb and Nd isotope time series for two ferromanganese crusts that grew from equatorial Pacific bottom water (D137-01, 'Nova', 7219 m water depth) and southwest Pacific deep water (63KD, 'Tasman', 1700 m water depth). The crusts were dated...

Nd, Pb, and Be isotopes of ferromanaganese crusts of the Atlantic Ocean, supplement to: Frank, Martin; van de Flierdt, Tina; Halliday, Alex N; Kubik, Peter W; Hattendorf, Bodo; Günther, Detlef (2003): Evolution of deep water mixing and wathering inputs in the central Atlantic Ocean over the past 33 Myr. Paleoceanography, 18(4), 1091

Martin Frank, Tina van de Flierdt, Alex N Halliday, Peter W Kubik, Bodo Hattendorf & Detlef Günther
The isotopic composition of Nd in present-day deep waters of the central and northeastern Atlantic Ocean is thought to fingerprint mixing of North Atlantic Deep Water with Antarctic Bottom Water. The central Atlantic Romanche and Vema Fracture Zones are considered the most important pathways for deep water exchange between the western and eastern Atlantic basins today. We present new Nd isotope records of the deepwater evolution in the fracture zones obtained from ferromanganese crusts, which...

Nd and Sr isotopic compositions and isotope dilution trace element concentrations from 7 sediment cores along the southeast Greenland margin, supplement to: Verplanck, Emily P; Farmer, G Lang; Andrews, John T; Dunhill, Gita; Millo, Christian (2009): Provenance of Quaternary glacial and glacimarine sediments along the southeast Greenland margin. Earth and Planetary Science Letters, 286(1-2), 52-62

Emily P Verplanck, G Lang Farmer, John T Andrews, Gita Dunhill & Christian Millo
The Nd and Sr isotopic compositions of Quaternary glacial and glacimarine siliciclastic sediments deposited along the margin of southeast Greenland were determined to assess the roles of the Greenland, Iceland, and more distal ice sheets in delivering detritus to this portion of the northern North Atlantic. The isotopic compositions of detritus generated by portions of the southern Greenland Ice Sheet were defined through measurements of till and trough mouth fan sediments. Massive diamicts from the...

Rare earth elements of ROV sample GeoB12338-2 from the Makran accretionary complex, supplement to: Himmler, Tobias; Bach, Wolfgang; Bohrmann, Gerhard; Peckmann, Jörn Ludwig (2010): Rare earth elements in authigenic methane-seep carbonates as tracers for fluid composition during early diagenesis. Chemical Geology, 277(1-2), 126-136

Tobias Himmler, Wolfgang Bach, Gerhard Bohrmann & Jörn Ludwig Peckmann
Authigenic carbonates forming at an active methane-seep on the Makran accretionary prism mainly consist of aragonite in the form of microcrystalline, cryptocrystalline, and botryoidal phases. The d13Ccarbonate values are very negative (-49.0 to -44.0 per mill V-PDB), agreeing with microbial methane as dominant carbon source. The d18Ocarbonate values are exclusively positive (+ 3.0 to + 4.5 per mill V-PDB) and indicate precipitation in equilibrium with seawater at bottom water temperatures. The content of rare earth...

Reconstruction of sea-surface conditions at middle to high latitudes of the Northern Hemisphere, supplement to: de Vernal, Anne; Eynaud, Frédérique; Henry, Maryse; Hillaire-Marcel, Claude; Londeix, Laurent; Mangin, Sylvie; Matthiessen, Jens; Marret, Fabienne; Radi, Taoufik; Rochon, André; Solignac, Sandrine; Turon, Jean-Louis (2005): Reconstruction of sea-surface conditions at middle to highlatitudes of the Northern Hemisphere during the Last Glacial Maximum(LGM) based on dinoflagellate cyst assemblages. Quaternary Science Reviews, 24(7-9), 897-924

Anne de Vernal, Frédérique Eynaud, Maryse Henry, Claude Hillaire-Marcel, Laurent Londeix, Sylvie Mangin, Jens Matthiessen, Fabienne Marret, Taoufik Radi, André Rochon, Sandrine Solignac & Jean-Louis Turon
A new calibration database of census counts of organic-walled dinoflagellate cyst (dinocyst) assemblages has been developed from the analyses of surface sediment samples collected at middle to high latitudes of the Northern Hemisphere after standardisation of taxonomy and laboratory procedures. The database comprises 940 reference data points from the North Atlantic, Arctic and North Pacific oceans and their adjacent seas, including the Mediterranean Sea, as well as epicontinental environments such as the Estuary and Gulf...

Micropaleontology and stable isotope record of ODP Hole 178-1098C, supplement to: Osterman, Lisa Ellen; Poore, Richard Z; Barron, John A (2001): Climate variability of the Holocene, Site 1098, Palmer Deep, Antarctica. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-45

Lisa Ellen Osterman, Richard Z Poore & John A Barron
Detailed study of four Holocene sediment intervals from Ocean Drilling Program Site 1098 (Palmer Deep, Antarctic Peninsula) reveals that in situ dissolution of calcareous foraminifers in the core repository has significantly altered and in some cases eliminated calcareous foraminifers. Despite dissolution, the foraminifer and supporting diatom data show that the most open-ocean and reduced sea-ice conditions occurred in the early Holocene. The influence of Circumpolar Deep Water was greatest during the early Holocene but continued...

Sea-surface temperature reconstruction of sediment cores from the Skagerrak, supplement to: Emeis, Kay-Christian; Struck, Ulrich; Blanz, Thomas; Kohly, Alexander; Voss, Maren (2003): Salinity changes in the central Baltic Sea (NW Europe) over the last 10000 years. The Holocene, 13(3), 411-421

Kay-Christian Emeis, Ulrich Struck, Thomas Blanz, Alexander Kohly & Maren Voss
We attempt a reconstruction of salinity levels of the central Baltic Sea based on diatom assemblages, the isotopic composition of organic matter and sedimentological expression of anoxia over the last 10 000 years. We use the data to investigate the dependence of salinity levels on climate evolution and isostasy. Changes in salinity of surface and deep waters were most pronounced from 8400 to approximately 5000 cal. BP. Density stratification between salty deep and fresher surface...

Geochemical and palynological results of IODP Hole 302-M0004A from Lomonosov Ridge, Arctic Ocean, supplement to: Sluijs, Appy; Schouten, Stefan; Donders, Timme H; Schoon, Petra L; Röhl, Ursula; Reichart, Gert-Jan; Sangiorgi, Francesca; Kim, Jung-Hyun; Sinninghe Damsté, Jaap S; Brinkhuis, Henk (2009): Warm and wet conditions in the Arctic region during Eocene Thermal Maximum 2. Nature Geosciences, 2, 777-780

Appy Sluijs, Stefan Schouten, Timme H Donders, Petra L Schoon, Ursula Röhl, Gert-Jan Reichart, Francesca Sangiorgi, Jung-Hyun Kim, Jaap S Sinninghe Damsté & Henk Brinkhuis
Several episodes of abrupt and transient warming, each lasting between 50,000 and 200,000 years, punctuated the long-term warming during the Late Palaeocene and Early Eocene (58 to 51 Myr ago) epochs**1,2. These hyperthermal events, such as the Eocene Thermal Maximum 2 (ETM2) that took place about 53.5 Myr ago**2, are associated with rapid increases in atmospheric CO2 content. However, the impacts of most events are documented only locally**3,4. Here we show, on the basis of...

Silicoflagellates in ODP Leg 108 holes, supplement to: Bukry, David (1989): Tropical Atlantic silicoflagellates from Leg 108 cores off Africa. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling PrograM; Scientific Results, College Station, TX (Ocean Drilling Program), 108, 487-489

David Bukry
The occurrence of Cenozoic silicoflagellates at three Ocean Drilling Program (ODP) Holes (660A, 662A, and 667A) was investigated to determine biostratigraphic and relative paleotemperature relations in the tropical Atlantic Ocean. This report presents the data obtained from a study of 37 samples and some preliminary comments on the data. The age of the single sparse assemblage at Hole 660A is late middle Eocene or late Eocene (Dictyocha hexacantha Zone); the sparse to common assemblages of...

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