1,070 Works

Ash layers, hyaloclastite, and alteration of basaltic glass at DSDP Leg 65 Holes, supplement to: Schmincke, Hans-Ulrich (1983): Ash layers, hyaloclastite, and alteration of basaltic glass, Leg 65. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 477-483

Hans-Ulrich Schmincke
Three types of tephra deposits were recovered on Leg 65 of the Deep Sea Drilling Project (DSDP) from three drill sites at the mouth of the Gulf of California: (1) a series of white ash layers at Sites 483, 484, and 485; (2) a layer of plagioclase- phyric sideromelane shards at Site 483; and (3) an indurated, cross-bedded hyaloclastite in Hole 483B. The ash layers in (1) are composed of colorless, fresh rhyolitic glass shards...

Paleomagnetic and rock magnetic properties of IODP Expedition 318 cores, supplement to: Tauxe, Lisa; Stickley, Catherine E; Sugisaki, Saiko; Bijl, Peter K; Bohaty, Steven M; Brinkhuis, Henk; Escutia Dotti, Carlota; Flores, José-Abel; Houben, Alexander J P; Iwai, Masao; Jiménez-Espejo, Francisco Jose; McKay, Robert M; Passchier, Sandra; Pross, Jörg; Riesselman, Christina R; Röhl, Ursula; Sangiorgi, Francesca; Welsh, Kevin; Klaus, Adam; Fehr, Annick; Bendle, James A; Dunbar, Robert G; Gonzales, J; Hayden, Travis; Katsuki, Kota; Olney, Matthew P; Pekar, Stephen F; Shrivastva, P K; van de Flierdt, Tina; Williams, Thomas; Yamane, Masako (2012): Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction. Paleoceanography, 27, PA2214

Lisa Tauxe, Catherine E Stickley, Saiko Sugisaki, Peter K Bijl, Steven M Bohaty, Henk Brinkhuis, Carlota Escutia Dotti, José-Abel Flores, Alexander J P Houben, Masao Iwai, Francisco Jose Jiménez-Espejo, Robert M McKay, Sandra Passchier, Jörg Pross, Christina R Riesselman, Ursula Röhl, Francesca Sangiorgi, Kevin Welsh, Adam Klaus, Annick Fehr, James A Bendle, Robert G Dunbar, J Gonzales, Travis Hayden, Kota Katsuki … & Masako Yamane
The Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17 Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable...

Multi-proxy analyses of sediment core GeoB13801-2, supplement to: Bender, Vera Barbara; Hanebuth, Till J J; Chiessi, Cristiano Mazur (2013): Holocene shifts of the Subtropical Shelf Front off southeastern South America controlled by high and low latitude atmospheric forcings. Paleoceanography

Vera Barbara Bender, Till J J Hanebuth & Cristiano Mazur Chiessi
Over the Uruguayan shelf and uppermost slope the coalescence of northward flowing Subantarctic Shelf Water and southward flowing Subtropical Shelf Water forms a distinct thermohaline front termed the Subtropical Shelf Front (STSF). Running in a SW direction diagonally across the shelf from the coastal waters at 32°S towards the shelf break at ca. 36°S, the STSF represents the shelf-ward extension of the Brazil-Malvinas Confluence zone. This study reconstructs latitudinal STSF shifts during the Holocene based...

Age models of ODP sites from the Barents Sea-Svalbard region, supplement to: Knies, Jochen; Matthiessen, Jens; Vogt, Christoph; Laberg, Jan Sverre; Hjelstuen, Berit O; Smelror, Morten; Larsen, Eiliv; Andreassen, Karin; Eidvin, Tor; Vorren, Tore O (2009): The Plio-Pleistocene glaciation of the Barents Sea–Svalbard region: a new model based on revised chronostratigraphy. Quaternary Science Reviews, 28(9-10), 812-829

Jochen Knies, Jens Matthiessen, Christoph Vogt, Jan Sverre Laberg, Berit O Hjelstuen, Morten Smelror, Eiliv Larsen, Karin Andreassen, Tor Eidvin & Tore O Vorren
Based on a revised chronostratigraphy, and compilation of borehole data from the Barents Sea continental margin, a coherent glaciation model is proposed for the Barents Sea ice sheet over the past 3.5 million years (Ma). Three phases of ice growth are suggested: (1) The initial build-up phase, covering mountainous regions and reaching the coastline/shelf edge in the northern Barents Sea during short-term glacial intensification, is concomitant with the onset of the Northern Hemisphere Glaciation (3.6-2.4...

X-ray fluorescence scannings, diatoms, and dinocyst of ODP Site 189-1172, supplement to: Röhl, Ursula; Brinkhuis, Henk; Stickley, Catherine E; Fuller, Michael D; Schellenberg, Stephen A; Wefer, Gerold; Wiliams, Graham L (2004): Sea level and astronomically induced environmental changes in middle and late Eocene sediments from the East Tasman Plateau. In: Exon, NF, Kennett, JP & Malone, M (eds.) The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica. American Geophysical Union (AGU), Geophysical Monograph Series, 151, 127-151

Ursula Röhl, Henk Brinkhuis, Catherine E Stickley, Michael D Fuller, Stephen A Schellenberg, Gerold Wefer & Graham L Wiliams
Eocene sediments drilled at the East Tasman Plateau (ETP) exhibit well-defined cycles, high-resolution magnetic stratigraphy, and environmentally-controlled dinoflagellate and diatom distribution patterns. We derive a cyclostratigraphy from the spectral analysis of high-resolution elemental concentration records (Ca, Fe) for this shallow marine time series spanning the middle to early late Eocene (C16n.2n - C21). Changes in carbonate content, the ratio between Gonyaulacoid and Peridinioid dinocysts, and relative abundance of "oligotrophic" diatoms serve as proxies for a...

Average nutrient concentration, and growth characteristics of bacteria during USCGC Healy cruises in 2002 and 2004, supplement to: Kirchman, David L; Hill, Victoria; Cottrell, Matthew T; Gradinger, Rolf; Malmstrom, Rex R; Parker, Alexander E (2009): Standing stocks, production, and respiration of phytoplankton and heterotrophic bacteria in the western Arctic Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 56(17), 1237-1248

David L Kirchman, Victoria Hill, Matthew T Cottrell, Rolf Gradinger, Rex R Malmstrom & Alexander E Parker
Standing stocks and production rates for phytoplankton and heterotrophic bacteria were examined during four expeditions in the western Arctic Ocean (Chukchi Sea and Canada Basin) in the spring and summer of 2002 and 2004. Rates of primary production (PP) and bacterial production (BP) were higher in the summer than in spring and in shelf waters than in the basin. Most surprisingly, PP was 3-fold higher in 2004 than in 2002; ice-corrected rates were 1581 and...

Petrology of basalts from DSDP Hole 66-487, supplement to: Arai, Shoji (1982): Petrology of basalts from Site 487, Deep Sea Drilling Project Leg 66, Middle America Trench area off Mexico. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 711-722

Shoji Arai
Basaltic rocks recovered at the Middle America Trench area off Mexico are typical plagioclase-olivine phyric abyssal tholeiites containing less than 0.2 wt.% K2O. Phenocrysts of plagioclase and olivine usually make up the aggregate. Plagioclase phenocrysts are Ca-rich and up to An90. Olivine phenocrysts, which are always attached to plagioclase phenocrysts, are magnesian, Fo88 to Fo89, and contain 0.2 to 0.3 wt. % of NiO. Plagioclase phenocrysts contain numerous glass inclusions with the Mg/Mg+Fe atomic ratio...

Petrology, geochemistry, and geodynamics at DSDP Hole 66-493, supplement to: Bellon, Herve; Maury, R C; Stephan, J F (1982): Dioritic basement, Site 493: Petrology, geochemistry, and geodynamics. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 723-730

Herve Bellon, R C Maury & J F Stephan
At Site 493, DSDP Leg 66, dioritic basement was reached below lower Miocene (NN1 Zone, 22-24 Ma) terrigenous sediments. Petrographical, mineralogical (including microprobe analyses), and chemical features of the dioritic rocks reveal their magmatic affinity with the calc-alkaline series. Furthermore, their radiometric age (35.3 m.y.) links the basement to the Sierra Madre Occidental in Mexico and to mid-Tertiary volcanic arcs in Central America. The presence of Oligocene diorite 50 km from the trench axis confirms...

Physicochemical and photosynthetic characteristics of water samples obtained during a CCGS Amundsen cruise in 2008, supplement to: Palmer, Molly A; Arrigo, Kevin R; Mundy, Christopher John; Ehn, Jens K; Gosselin, Michel; Barber, David G; Martin, Johannie; Alou, Eva; Roy, Suzanne; Tremblay, Jean-Éric (2011): Spatial and temporal variation of photosynthetic parameters in natural phytoplankton assemblages in the Beaufort Sea, Canadian Arctic. Polar Biology, 34(12), 1915-1928

Molly A Palmer, Kevin R Arrigo, Christopher John Mundy, Jens K Ehn, Michel Gosselin, David G Barber, Johannie Martin, Eva Alou, Suzanne Roy & Jean-Éric Tremblay
During summer 2008, as part of the Circumpolar Flaw Lead system study, we measured phytoplankton photosynthetic parameters to understand regional patterns in primary productivity, including the degree and timescale of photoacclimation and how variability in environmental conditions influences this response. Photosynthesis-irradiance measurements were taken at 15 sites primarily from the depth of the subsurface chlorophyll a (Chl a) maximum (SCM) within the Beaufort Sea flaw lead polynya. The physiological response of phytoplankton to a range...

Synthesized grounding line and ice shelf mask for Antarctica, supplement to: Depoorter, Mathieu A; Bamber, Jonathan L; Griggs, Jennifer; Lenaerts, Jan T M; Ligtenberg, Stefan R M; van den Broeke, Michiel R; Moholdt, Geir (2013): Calving fluxes and basal melt rates of Antarctic ice shelves. Nature, 502, 89-92

Mathieu A Depoorter, Jonathan L Bamber, Jennifer Griggs, Jan T M Lenaerts, Stefan R M Ligtenberg, Michiel R van den Broeke & Geir Moholdt
Iceberg calving has been assumed to be the dominant cause of mass loss for the Antarctic ice sheet, with previous estimates of the calving flux exceeding 2,000 gigatonnes per year. More recently, the importance of melting by the ocean has been demonstrated close to the grounding line and near the calving front. So far, however, no study has reliably quantified the calving flux and the basal mass balance (the balance between accretion and ablation at...

Petroleum-generating potential of sediments at DSDP Leg 64 Holes, supplement to: Kendrick, J W (1982): Petroleum-generating potential of sediment in the Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 871-875

J W Kendrick
Sediments from the Gulf of California contain sufficient amounts of thermally reactive organic matter to be considered fair-to-good potential petroleum source rocks. While sediments deposited within the present oxygen-minimum zone have the greatest amounts of organic matter, those deposited below the oxygen-minimum contain sufficient organic matter to be considered potential source rocks. The organic matter in the sediment is almost exclusively marine, Type II kerogen. Different techniques of determining kerogen composition produce generally compatible answers,...

Foraminifera abundances, IRD, stable isotope record and age determination of Arctic Ocean surface sediment samples, supplement to: Poore, Richard Z; Ostermann, Dorinda R; McGeehin, John P (1999): Stable isotope data and AMS 14C dates from Arctic Ocean Section 1994 surface sediment transect and box core samples from the Mendeleyev Ridge area. U S Geological Survey Open-File Report, 99-48, 17 pp

Richard Z Poore, Dorinda R Ostermann & John P McGeehin
During the summer of 1994 the United States and Canada conducted a joint Oceanographic and sediment sampling program in the western Arctic Ocean (Aagaard and others, 1996). The experiment which was called the Arctic Ocean Section (AOS), recovered a series of piston and box cores along a transect of the Arctic that extended from the Chukchi Sea to the North Pole and into the eastern Arctic Basin. In this report we present data on abundance...

Benthic foraminiferal stable isotope record for the equatorial Pacific, supplement to: Edgar, Kirsty M; Pälike, Heiko; Wilson, Paul A (2013): Testing the impact of diagenesis on the d18O and d13C of benthic foraminiferal calcite from a sediment burial depth transect in the equatorial pacific. Paleoceanography, 28(3), 468-480

Kirsty M Edgar, Heiko Pälike & Paul A Wilson
Stable oxygen and carbon isotope (d18O and d13C) values measured in foraminiferal calcite are one of the primary tools used in paleoceanography. Diagenetic recrystallization of foraminiferal calcite can act to reset primary isotopic values, but its effects are typically poorly quantified. Here we test the impact of early stage diagenesis on stable isotope records generated from a suite of drill sites in the equatorial Pacific Ocean recovered during Ocean Drilling Program Leg 199 and Integrated...

Organic geochemical studies of DSDP Leg 64 Holes, supplement to: Galimov, Erik M; Kodina, Ludmilla A; Bogacheva, M P; Shirinsky, V G (1982): Organic geochemical studies of samples from Deep Sea Drilling Project Leg 64, Gulf of California, Sites 474, 477, 478, 479, and 481. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 819-836

Erik M Galimov, Ludmilla A Kodina, M P Bogacheva & V G Shirinsky
Twenty-six core samples from Leg 64, Holes 474, 474A, 477, 478, 479, and 481A in the Gulf of California, were provided by the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES) Advisory Panel on Organic Geochemistry for analysis. The high heat flow characteristic of the basin provides an opportunity to study the effect of temperature on the diagenesis of organic matter. The contents and carbon isotope compositions of the organic matter and bitumen fractions of...

Organic facies and hydrocarbon potential at DSDP Leg 64 Holes, supplement to: Gilbert, Deborah; Summerhayes, Colin P (1982): Organic facies and hydrocarbon potential in the Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 865-870

Deborah Gilbert & Colin P Summerhayes
The sediments from the Gulf of California are potentially good sources for oil and gas. They are rich in organic carbon (av. = 1.9%). Sediments from the margins of the Gulf are rich in oil-prone marine-amorphous organic matter. Sediments from Guaymas Basin contain the same material plus abundant subordinate amounts of gas-prone terrestrially derived organic matter. The enrichment of all of these sediments in marine-amorphous components reflects deposition in a highly productive and oxygen-poor water...

Mineralogy and geochemistry at DSDP Leg 64 Holes, supplement to: Kelts, Kerry (1982): Petrology of hydrothermally metamorphosed sediments at Deep Sea Drilling Site 477, southern Guaymas Basin Rift, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1123-1136

Kerry Kelts
At DSDP Site 477, late Quaternary diatomaceous muds and delta-derived silty-sand turbidites at 2000 meters water depth have been extensively and progressively altered by a deep-seated heat source beneath a sill. Bulk petrologic and microprobe analyses have identified a crudely zoned paragenesis within 260 meters sub-bottom which ranges from unaltered to slightly altered oozes (0-50 m), anhydrite-dolomite claystones (105-125 m), illite-chlorite-pyrite claystones (125-140 m), chlorite-pyrite-calcite-carbonaceous claystones with traces of K-feldspar, albite, epidote (140-190 m), and...

Isotopic survey of diagenetic carbonates, at DSDP Leg 63 Holes, supplement to: Pisciotto, Kenneth A; Mahoney, John J (1981): Isotopic survey of diagenetic carbonates, Deep Sea Drilling Project Leg 63. In: Yeats, RS; Haq, BU; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 63, 595-609

Kenneth A Pisciotto & John J Mahoney
Authigenic carbonates, principally calcium-rich dolomites, with extremely variable isotopic compositions were recovered in organic-rich marine sediments during Leg 63 drilling off southern California and Baja California. These carbonates occur as thin layers in fine-grained, diatomaceous sediments and siliceous rocks, mostly deposited during the Neogene. A combination of textural, geochemical, and isotopic evidence indicates these dolomites formed as cements and precipitates in shallow subsurface zones of high alkalinity spawned by abundant CO2 and methane production during...

Age model for the time between 3.45 and 2.45 Ma of ODP Site 189-1172, supplement to: Ballegeer, Anne-Marie; Flores, José-Abel; Sierro, Francisco Javier; Andersen, Nils (2012): Monitoring fluctuations of the Subtropical Front in the Tasman Sea between 3.45 and 2.45Ma (ODP site 1172). Palaeogeography, Palaeoclimatology, Palaeoecology, 313-314, 215-224

Anne-Marie Ballegeer, José-Abel Flores, Francisco Javier Sierro & Nils Andersen
Calcareous nannoplankton assemblages and benthic d18O isotopes of Pliocene deep-sea sediments of ODP site 1172 (East of Tasmania) have been studied to improve our knowledge of the Southern Ocean paleoceanography. Our study site is located just north of the Subtropical Front (STF), an ideal setting to monitor migrations of the STF during our study period, between 3.45 and 2.45 Ma.The assemblage identified at ODP site 1172 has been interpreted as characteristic for the transitional zone...

Composition of sediment pore water and isotopes in carbonate and benthic foraminifera at DSDP Holes 68-501, 69-505 and Site 69-504, supplement to: Mottl, Michael J; Lawrence, James R; Keigwin, Lloyd D (1983): Elemental and stable-isotope composition of pore waters and carbonate sediments from Deep Sea Drilling Project Sites 501/504 and 505. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 461-473

Michael J Mottl, James R Lawrence & Lloyd D Keigwin
Two sites on the southern flank of the Costa Rica Rift were drilled on DSDP Legs 68 and 69, one on crust 3.9 m.y. old and the other on crust 5.9 m.y. old. The basement of the younger site is effectively cooled by the circulation of seawater. The basement of the older site has been sealed by sediment, and an interval in the uppermost 560 meters of basement recently reheated to temperatures of 60 to...

Chemical composition and sulfur-isotope ratios in DSDP Legs 69-and 70, supplement to: Belyi, V M; Migdisov, Areg A; Barskaja, N V; Grinenko, V A (1983): Sulfur-isotope composition of hydrothermal sulfides from Hole 504B, Deep Sea Drilling Project Leg 70, Costa Rica Rift. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 619-627

V M Belyi, Areg A Migdisov, N V Barskaja & V A Grinenko
As part of the geochemical-petrological study of basalts recovered from DSDP Hole 504B (Leg 70) on the southern flank of the Costa Rica Rift, we investigated specially the relationships between the distribution and isotopic composition of sulfur of scattered and vein sulfides on the one hand, and the observed pattern and processes of secondary alterations on the other. The following groups of observations are essential: (1) variations in the contents and isotopic composition of sulfur...

Basic and other measurements of radiation at station South Pole, 1992-2009

Ellsworth G Dutton
The data collection contains 213 links to basic and other measurements of radiation from the Baseline Surface Radiation Network (BSRN). It covers all available measurements from the time period between 1992-01 and 2009-12 taken at BSRN station at South Pole.Any user who accepts the BSRN data release guidelines (http://bsrn.awi.de/data/conditions-of-data-release) may ask Amelie Driemel (mailto:Amelie.Driemel@awi.de) to obtain an account to download these datasets.

Paleocene and Eocene calcareous nannofossils at DSDP Legs 25 and 40 Holes, supplement to: MacKenzie, Duncan T; Wise, Sherwood W (1983): Paleocene and Eocene calcareous nannofossils from Deep Sea Drilling Project Legs 25 and 40, South and East of Africa. In: Ludwig, WJ; Krasheninnikov, VA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 71, 1141-1170

Duncan T MacKenzie & Sherwood W Wise
Paleocene and Eocene nannofossil flora from Deep Sea Drilling Project Legs 25 and 40 were analyzed in order to provide a basis of comparison with DSDP Legs 36 and 71 and with other South Atlantic assemblages. A mid-latitude biostratigraphic zonation, using previously described zonal markers, was adopted for the southwest Indian Ocean. Various diagenetic effects were noted in the sedimentary sequences. Some of these mask to some extent paleoecologic signals, particularly those generated by the...

Various ratios of C1-C5 hydrocarbons, gas composition and computed temperature at DSDP Leg 64 Holes, supplement to: Simoneit, Bernd R T (1982): Shipboard organic geochemistry and safety monitoring, Leg 64, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 723-727

Bernd R T Simoneit
I have evaluated shipboard data and preliminary interpretations related to organic geochemistry in light of additional shore-based analyses. Data on interstitial gas, the C/N ratio, and fluorescence indicate that organic matter was altered by sills and that these were all single intrusions except the upper sill complex at Site 481, which was a multiple emplacement. Site 477 had the highest in situ temperature, estimated from interstitial gas composition to be 225°C.

Geochemistry of interstitial gases in sedimentary deposits at DSDP Leg 64 Holes, supplement to: Galimov, Erik M; Simoneit, Bernd R T (1982): Geochemistry of interstitial gases in sedimentary deposits of the Gulf of California, Deep Sea Drilling Project Leg 64. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 781-787

Erik M Galimov & Bernd R T Simoneit
We analyzed interstitial gases from holes at Sites 474, 477, 478, 479, and 481 in the Gulf of California, using gas chromatography and stable isotope mass spectrometry to evaluate their composition in terms of biogenic and thermogenic sources. The hydrocarbon gas (C1-C5) concentrations were comparable to the shipboard data, and no olefins could be detected. The δ13C data for the CH4 confirmed the effects of thermal stress on the sedimentary organic matter, because the values...

Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica, supplement to: Grobe, Hannes (1986): Spätpleistozäne Sedimentationsprozesse am antarktischen Kontinentalhang vor Kapp Norvegia, östliche Weddell See. Berichte zur Polarforschung = Reports on Polar Research, 27, 121 pp

Hannes Grobe
Sediment cores from nine sites along a profile on the Antarctic continental margin off Kapp Norvegia were analysed sedimentologicaly. The carbonate and organic carbon content, grain size distribution, composition of the coarse fraction and clay minerals were determined. d18O- and d13C-isotope ratios were also measured. The distribution of ice rafted debris was determined by a new method. Sedimentation-rates were obtained from 230Th- and 14C-analyses.A segregation into seven different sediment facies was made possible by different...

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