2,966 Works

Neogene planktonic foraminifera from the southern Kerguelen Plateau, supplement to: Berggren, William A (1992): Neogene planktonic foraminifer magnetostratigraphy of the southern Kerguelen Plateau (Sites 747, 748, 751). In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 631-647

William A Berggren
With the exception of a brief (2 m.y.) late Miocene-early Pliocene hiatus, an essentially complete Neogene record was recovered on the Kerguelen Plateau in a calcareous biofacies. The stratigraphic distribution of about 30 taxa of Neogene planktonic foraminifers recovered at Sites 747, 748,and 751 (Central and Southern Kerguelen plateaus; approximately 54°-58°S) is recorded. Faunas are characterized by low diversity and high dominance and exhibit a gradual decline in species numbers (reflecting a concomitant increase in...

Diatom biostratigraphy of sediments from the Kerguelen Plateau, Southern Ocean, supplement to: Harwood, David M; Maruyama, Toshiaki (1992): Middle Eocene to Pleistocene diatom biostratigraphy of Southern Ocean sediments from the Kerguelen Plateau, Leg 120. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 683-733

David M Harwood & Toshiaki Maruyama
The biostratigraphic distribution and abundance of lower Oligocene to Pleistocene diatoms is documented from Holes 747A, 747B, 748B, 749B, and 751A drilled during Ocean Drilling Program Leg 120 on the Kerguelen Plateau in the southeast Indian Ocean. The occurrence of middle and upper Eocene diatoms is also documented, but these are rare and occur in discrete intervals. The recovery of several Oligocene to Pleistocene sections with minimal coring gaps, relatively good magnetostratigraphic signatures, and mixed...

Neogene Radiolarians from the Kerguelen Plateau, supplement to: Lazarus, David B (1992): Antarctic Neogene radiolarians from the Kerguelen Plateau, Legs 119 and 120. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 785-809

David B Lazarus
Abundant, generally well-preserved radiolarians from Sites 737, 744, 745, 746, 747, 748, and 751 were used in stratigraphic analysis of Neogene, and particularly middle Miocene to Holocene, Kerguelen Plateau sediments. The composite Kerguelen section is more complete than the Weddell Sea sections recovered by Leg 113, and the radiolarians are better preserved. Leg 113 radiolarian zonations of Weddell Sea sites were applicable with only slight modification, and three new zones - Siphonosphaera vesuvius, Acrosphaeral labrata,...

Silicoflaggelates from ODP Leg 120 on the Kerguelen Plateau, supplement to: McCartney, Kevin; Harwood, David M (1992): Silicoflagellates from Leg 120 on the Kerguelen Plateau, Southeast Indian Ocean. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 811-831

Kevin McCartney & David M Harwood
The biostratigraphic distribution and abundance of Eocene to Pleistocene silicoflagellates is documented from Ocean Drilling Program Leg 120 Holes 747A, 748A, 748B, 749B, and 751A on the Central Kerguelen Plateau. Well-preserved silicoflagellates are reported here from the middle Eocene Dictyocha grandis Zone to the Pleistocene Distephanus speculum speculum Zone. Assemblage diversity and abundance is variable, with many intervals either barren of silicoflagellates or containing only limited numbers.

Methane and sulfide fluxes in permanent anoxia: in situ studies at the Dvurechenskii mud volcano (Sorokin Trough, Black Sea)

Anna Lichtschlag, Janine Felden, Frank Wenzhöfer, Florence Schubotz, Tobias F Ertefai, Antje Boetius & Dirk de Beer
The Dvurechenskii mud volcano (DMV), located in permanently anoxic waters at 2060 m depth (Sorokin Trough, Black Sea), was visited during the M72/2 cruise with the RV Meteor to investigate the methane and sulfide release from mud volcanoes into the Black Sea hydrosphere. We studied benthic fluxes of methane and sulfide, and the factors controlling transport, consumption and production of both compounds within the sediment. The pie shaped mud volcano showed temperature anomalies as well...

Sea-floor images from ROV transects during POLARSTERN cruise ANT-XVII/3 (EASIZ III) to the Weddell Sea, Antarctica

Julian Gutt, Andreas Starmans & Núria Teixidó
Transects of a Remotely Operated Vehicle (ROV) providing sea-bed videos and photographs were carried out during POLARSTERN expedition ANT-XVII/3 focussing on the ecology of benthic assemblages on the Antarctic shelf in the South-Eastern Weddell Sea. The ROV-system sprint 103 was equiped with two video- and one still camera, lights, flash-lights, compass, and parallel lasers providing a scale in the images, a tether-management system (TMS), a winch, and the board units. All cameras used the same...

(Table 22-30) Revised composite depth scales of IODP Sites 320-U1331, U1332, U1333, U1334 and ODP Sites 199-1218, 199-1219, 199-1220, supplement to: Westerhold, Thomas; Röhl, Ursula; Wilkens, Roy H; Pälike, Heiko; Lyle, Mitchell W; Dunkley Jones, Tom; Bown, Paul R; Moore, Ted; Kamikuri, Shin-Ichi (2012): Revised composite depth scales and integration of IODP Sites U1331, U1332, U1333, U1334 and ODP Sites 1218, 1219, 1220. Proc. IODP: Tokyo (Integrated Ocean Drilling Program Management International, Inc.), 320/321

Thomas Westerhold, Ursula Röhl, Roy H Wilkens, Heiko Pälike, Mitchell W Lyle, Tom Dunkley Jones, Paul R Bown, Ted Moore & Shin-Ichi Kamikuri
Integrated Ocean Drilling Program (IODP) Expedition 320 recovered high-quality paleomagnetic records with over 800 dated reversals and decimeter-scale cyclic sediments which provide an outstanding framework to inter-calibrate major fossil groups and refine magnetic polarity chrons for the early Miocene, the entire Oligocene and the late Eocene Epoch. In order to reconstruct the climate history of the Equatorial Pacific one of the major objectives of the Pacific Equatorial Age Transect (PEAT) is the compilation of a...

Age model, lipids, and iron/calcium-ratios of sediment core GeoB9307-3, supplement to: Schefuß, Enno; Kuhlmann, Holger; Mollenhauer, Gesine; Prange, Matthias; Pätzold, Jürgen (2011): Forcing of south-east African wet phases during the last 17,000 years. Nature, 480(7378), 509-512

Enno Schefuß, Holger Kuhlmann, Gesine Mollenhauer, Matthias Prange & Jürgen Pätzold
Hide Intense debate persists about the climatic mechanisms governing hydrologic changes in tropical and subtropical southeast Africa since the Last Glacial Maximum, about 20,000 years ago. In particular, the relative importance of atmospheric and oceanic processes is not firmly established. Southward shifts of the intertropical convergence zone (ITCZ) driven by high-latitude climate changes have been suggested as a primary forcing, whereas other studies infer a predominant influence of Indian Ocean sea surface temperatures on regional...

Hexachlorocyclohexanes concentration in air and ocean water, supplement to: Xie, Zhiyong; Koch, Boris P; Möller, A; Sturm, R; Ebinghaus, Ralf (2011): Transport and fate of hexachlorocyclohexanes in the oceanic air and surface seawater. Biogeosciences, 8(9), 2621-2633

Z Xie, Boris P Koch, A Möller, R Sturm & Ralf Ebinghaus
Hexachlorocyclohexanes (HCHs) are ubiquitous organic pollutants derived from pesticide application. They are subject to long-range transport, persistent in the environment, and capable of accumulation in biota. Shipboard measurements of HCH isomers (a-, b- and g-HCH) in surface seawater and boundary layer atmospheric samples were conducted in the Atlantic and the Southern Ocean in October to December of 2008. SumHCHs concentrations (the sum of a-, g- and b-HCH) in the lower atmosphere ranged from 12 to...

Data on the biogeochemical cycle of methane in the ocean, supplement to: Lein, Alla Yu; Ivanov, Mikhail V (2009): Biogeokhimicheskii Tsikl Metana v Okeane (Biogeochemical Cycle of Methane in the Ocean). Nauka Publ. (Moscow); Lisitzin, A.P. (Ed.), 576 pp.

Alla Yu Lein & Mikhail V Ivanov
Geological, mineralogical and microbiological aspects of the methane cycle in water and sediments of different areas in the oceans are under consideration in the monograph. Original and published estimations of formation- and oxidation rates of methane with use of radioisotope and isotopic methods are given. The role of aerobic and anaerobic microbial oxidation of methane in production of organic matter and in formation of authigenic carbonates is considered. Particular attention is paid to processes of...

Radionuclides in ice cores I and II from Vernagferner, Austria, supplement to: von Gunten, Hans R; Rössler, Elfriede; Gäggeler, Heinz (1982): Dating of ice cores from Vernagtferner (Austria) with fission products and lead-210. Zeitschrift für Gletscherkunde und Glazialgeologie, 18(1), 37-45

Hans R von Gunten, Elfriede Rössler & Heinz Gäggeler
Fission product (90Sr-90Y, 137Cs, total beta) and 21OPb-210Po activities were measured in core samples from the temperate vernagtferner (3150 m altitude, Oetztal Alps, Austria). The results show that the investigated fission products are transported with water resulting from melting processes, and are sorbed on dust or dirt horizons. These products are, therefore, not suited for dating temperate glaciers.210Pb is also transported with water and displaced from its original deposition. However, despite large fluctuations, the specific...

Mineralogy and stable oxygen isotope ratios of the Cretaceous-Tertiary boundary, supplement to: Kastner, Miriam; Asaro, Frank; Michel, Helen V; Alvarez, Walter; Alvarez, Luis W (1984): The precursor of the Cretaceous-Tertiary boundary clays at Stevns Klint, Denmark, and DSDP Hole 465A. Science, 226(4671), 137-143

Miriam Kastner, Frank Asaro, Helen V Michel, Walter Alvarez & Luis W Alvarez
Results of detailed mineralogical, chemical, and oxygen isotope analyses of the clay minerals and zeolites from two Cretaceous-Tertiary (K/T) boundary regions, Stevns Klint, Denmark, and Deep Sea Drilling Project (DSDP) Hole 465A in the north central Pacific Ocean, are presented. In the central part of the Stevns Klint K/T boundary layer, the only clay mineral detected by x-ray diffraction is a pure smectite with > 95 percent expandable layers. No detrital clay minerals or quartz...

Planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of ODP Hole 175-1078C, supplement to: Hessler, Ines; Steinke, Stephan; Groeneveld, Jeroen; Dupont, Lydie M; Wefer, Gerold (2011): Impact of abrupt climate change in the tropical southeast Atlantic during Marine Isotope Stage (MIS) 3. Paleoceanography, 26, PA4209

Ines Hessler, Stephan Steinke, Jeroen Groeneveld, Lydie M Dupont & Gerold Wefer
High resolution planktonic foraminifera Mg/Ca paleotemperatures and oxygen isotopes of seawater of Ocean Drilling Program (ODP) Site 1078 (off Angola) have been reconstructed and reveal insights into the seasonal thermal evolution of the Angola Current (AC), the Angola-Benguela Front (ABF), and the Benguela Current (BC) during the last glacial (50-23.5 ka BP). Special emphasis is put on time intervals possibly associated with the North Atlantic Heinrich Stadials (HS), which are thought to lead to an...

Age determination and Argon geochemistry of Hawaiian Emperor seamounts, supplement to: Sharp, Warren D; Clague, David A (2006): 50-Ma initiation of Hawaiian-Emperor bend records major change in Pacific Plate motion. Science, 313(5791), 1281-1284

Warren D Sharp & David A Clague
The Hawaiian-Emperor bend has played a prominent yet controversial role in deciphering past Pacific plate motions and the tempo of plate motion change. New ages for volcanoes of the central and southern Emperor chain define large changes in volcanic migration rate with little associated change in the chain's trend, which suggests that the bend did not form by slowing of the Hawaiian hot spot. Initiation of the bend near Kimmei seamount about 50 million years...

Geochemistry of ODP Leg 125 peridotites, supplement to: Parkinson, Ian J; Pearce, Julian A (1998): Peridotites from the Izu-Bonin-Mariana forearc (ODP Leg 125): Evidence for mantle melting and melt-mantle interaction in a supra-subduction zone setting. Journal of Petrology, 39(9), 1577-1618

Ian J Parkinson & Julian A Pearce
Ocean Drilling Program Leg 125 recovered serpentined harzburgites and dunites from a total of jive sites on the crests and flanks of two serpen finite seamounts, Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu-Bonin forearc. These are some of the first extant forearc peridotites reported in the literature and they provide a window into oceanic, supra-subduction zone (SSZ) mantle processes. Harzbutrgites from both seamounts are very refractory with low modal...

Ecological investigations in the wadden area off Borkum, East Frisian Islands, Germany, supplement to: Günther, Carmen-Pia (1990): Zur Ökologie von Muschelbrut im Wattenmeer. PhD Thesis, Fachbereich 2 (Biologie/Chemie) der Universität Bremen, Germany, 183 pp

Carmen-Pia Günther
Die Bodentiergemeinschaft des Wattenmeeres ist von Frühjahr bis Herbst eines jeden Jahres durch extrem hohe Dichten von Jungtieren charakterisiert. Die Kenntnisse über die Ansiedlung von fplanktischen Larven im Wattenmeer, sowie die Dynamik postlarvaler Stadien sind aufgrund der üblicherweise verwendeten, großen Siebmaschenweiten gering. Gerade aber diesen Altersstadien kommt möglicherweise eine besondere Stellung im Energiefluß des Wattenmeeres zu.An 5 Stationen (von NWL bis HWL, B1-B5) im Rückseitenwatt der ostfriesischen Insel Borkum wurden 1986 Ansiedlung, räumliche Verteilung, Wachstum,...

Aerosols in the Arctic, supplement to: Shevchenko, Vladimir P (2006): Vliyanie Aerozoley na Sredu i Morskoe Osadkonakoplenie v Arktike (Influence of Aerosols on Environment and Marine Sedimentation in the Arctic). Nauka Publ. (Moscow): in Russian, 226 pp

Vladimir P Shevchenko
In this monograph on the basis of materials obtained by the author and his colleagues in Arctic expeditions of 1991-2005 and of published data results of studies effect of aerosols on environmental conditions and marine sedimentation in the Arctic are summarizes. Processes of aeolian transport and transformation of sedimentary material from sources to places of its accumulation in bottom sediments are described. Results of this study can be used to assess current state of ecosystem...

Sulfur in oceans and seas, supplement to: Volkov, Igor I (1984): Geokhimiya Sery v Osadkakh Okeana (Geochemistry of Sulfur in Ocean Sediments). Nauka Publ. (Moscow): in Russian, 272 pp

Igor I Volkov
The book summarizes results of long-term studies of sulfur geochemistry in bottom sediments of seas and oceans. Processes of hydrogen sulfide formation in bacterial reduction of sulfates, its transformation into transient and stable compounds of reduced sulfur in liquid and solid phases of sediments are under consideration. Regularities of distribution of sulfate and reduced sulfur in ocean sediments are shown. Problems of sulfur budget in the modern oceans are discussed.

Geochemical parameters of sediments and waters in areas of ocean barrier zones, supplement to: Emelyanov, Emelyan M (1998): Bar'ernye Zony v Okeane (Barrier Zones in the Ocean). Yantarny Skaz (Kaliningrad), 416 pp

Emelyan M Emelyanov
Geochemical barrier zones play an important role in determining various physical systems and characteristics of oceans, e.g. hydrodynamics, salinity, temperature and light. In the book each of more than 30 barrier zones are illustrated and defined by physical, chemical and biological parameters. Among the topics discussed are processes of inflow, transformation and precipitation of the sedimentary layer of the open oceans and more restricted areas such as the Baltic, Black and Mediterranean Seas.

Stable oxygen isotope ratios in zircons from oceanic crust, supplement to: Grimes, Craig B; Ushikubo, Takayuki; John, Barbara E; Valley, John W (2011): Uniformly mantle-like d18O in zircons from oceanic plagiogranites and gabbros. Contributions to Mineralogy and Petrology, 161(1)

Craig B Grimes, Takayuki Ushikubo, Barbara E John & John W Valley
Lower ocean crust is primarily gabbroic, although 1-2% felsic igneous rocks that are referred to collectively as plagiogranites occur locally. Recent experimental evidence suggests that plagiogranite magmas can form by hydrous partial melting of gabbro triggered by seawater-derived fluids, and thus they may indicate early, high-temperature hydrothermal fluid circulation. To explore seawater-rock interaction prior to and during the genesis of plagiogranite and other late-stage magmas, oxygen-isotope ratios preserved in igneous zircon have been measured by...

High-pressure experiments on a natural olivine gabbro from ODP Hole 176-735B, supplement to: Yaxley, G M; Sobolev, Alexander V (2007): High-pressure partial melting of gabbro and its role in the Hawaiian magma source. Contributions to Mineralogy and Petrology, 154(4), 371-383

G M Yaxley & Alexander V Sobolev
We have conducted high-pressure experiments on a natural oceanic gabbro composition (Gb108). Our aim was to test recent proposals that Sr-enrichment in rare primitive melt inclusions from Mauna Loa, Hawaii, may have resulted from melting of garnet pyroxenite formed in the magma source regions by reaction of peridotite with siliceous, Sr-enriched partial melts of eclogite of gabbroic composition. Gb108 is a natural, Sr-enriched olivine gabbro, which has a strong positive Sr anomaly superimposed on an...

Radium in Arctic surface water, supplement to: Rutgers van der Loeff, Michiel M; Cai, Pinghe; Stimac, Ingrid; Bauch, Dorothea; Hanfland, Claudia; Roeske, Tobias; Moran, S Bradley (2012): Shelf-basin exchange times of Arctic surface waters estimated from 228Th/228Ra disequilibrium. Journal of Geophysical Research: Oceans, 177, C03024

Michiel M Rutgers van der Loeff, Pinghe Cai, Ingrid Stimac, Dorothea Bauch, Claudia Hanfland, Tobias Roeske & S Bradley Moran
The transpolar drift is strongly enriched in 228Ra accumulated on the wide Arctic shelves with subsequent rapid offshore transport. We present new data of Polarstern expeditions to the central Arctic and to the Kara and Laptev seas. Because 226Ra activities in Pacific waters are 30% higher than in Atlantic waters, we correct 226Ra for the Pacific admixture when normalizing 228Ra with 226Ra. The use of 228Ra decay as age marker critically depends on the constancy...

Petrology and geochemistry of peridotites from IODP Site 304-U1309, supplement to: Tamura, Akihiro; Arai, Shoji; Ishimaru, Satoko; Andal, Eric S (2008): Petrology and geochemistry of peridotites from IODP Site U1309 at Atlantis Massif, MAR 30°N: micro- and macro-scale melt penetrations into peridotites. Contributions to Mineralogy and Petrology, 155(4), 491-509

Akihiro Tamura, Shoji Arai, Satoko Ishimaru & Eric S Andal
Peridotite samples recovered from IODP Site U1309 at the Atlantis Massif in the Mid-Atlantic Ridge were examined to understand magmatic processes for the oceanic core complex formation. Original peridotite was fragmented, and the limited short peridotite intervals are now surrounded by a huge gabbro body probably formed by late-stage melt injections. Each peridotite interval has various petrographical and geochemical features. A spinel harzburgite in contact with gabbro shows evidence of limited melt penetrations causing gradual...

Measurements of stable carbon isotope ratios of CO2 over the last 24000 years and CO2 concentration measurements on Antarctic ice cores using three different methods, supplement to: Schmitt, Jochen; Schneider, Robert; Elsig, Joachim; Leuenberger, Daiana; Lourantou, Anna; Chappellaz, Jérôme A; Köhler, Peter; Joos, Fortunat; Stocker, Thomas F; Leuenberger, Markus C; Fischer, Hubertus (2012): Carbon isotope constraints on the deglacial CO2 rise from ice cores. Science, 336(6082), 711-714

Jochen Schmitt, Robert Schneider, Joachim Elsig, Daiana Leuenberger, Anna Lourantou, Jérôme A Chappellaz, Peter Köhler, Fortunat Joos, Thomas F Stocker, Markus C Leuenberger & Hubertus Fischer
The stable carbon isotope ratio of atmospheric CO2 (d13Catm) is a key parameter in deciphering past carbon cycle changes. Here we present d13Catm data for the past 24,000 years derived from three independent records from two Antarctic ice cores. We conclude that a pronounced 0.3 per mil decrease in d13Catm during the early deglaciation can be best explained by upwelling of old, carbon-enriched waters in the Southern Ocean. Later in the deglaciation, regrowth of the...

Geochemistry of plagioclase from the Mid-Atlantic Ridge, supplement to: Costa, Fidel; Coogan, Laurence A; Chakraborty, Sumit (2010): The time scales of magma mixing and mingling involving primitive melts and melt–mush interaction at mid-ocean ridges. Contributions to Mineralogy and Petrology, 159(3), 371-387

Fidel Costa, Laurence A Coogan & Sumit Chakraborty
We have studied the chemical zoning of plagioclase phenocrysts from the slow-spreading Mid-Atlantic Ridge and the intermediate-spreading rate Costa Rica Rift to obtain the time scales of magmatic processes beneath these ridges. The anorthite content, Mg, and Sr in plagioclase phenocrysts from the Mid-Atlantic Ridge can be interpreted as recording initial crystallisation from a primitive magma (~11 wt% MgO) in an open system. This was followed by crystal accumulation in a mush zone and later...

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