530 Works

Optical properties of tropospheric aerosol and sulfate scattering efficiency measured at Neumayer Station, Antarctica, supplement to: Weller, Rolf; Lampert, Astrid (2008): Optical properties and sulfate scattering efficiency of boundary layer aerosol at coastal Neumayer Station, Antarctica. Journal of Geophysical Research-Atmospheres, 113, D16208

Rolf Weller & Astrid Lampert
We measured optical properties and ionic composition of the aerosol at Neumayer Station from 2004 through 2006 by an integrating nephelometer and chemical analysis of daily aerosol samples, respectively. From this unique data set we discuss the seasonality of aerosol optical parameters along with their chemical composition. Austral summer (November through March) was characterized by mean particle number concentrations of 472±260 cm**-3 compared to 168±160 cm**-3 during winter (April through October), mean scattering Ångström exponents...

Chemical, isotope and mineral composition of hydrothermally altered upper oceanic crust drilled at ODP Site 129-801C, supplement to: Alt, Jeffrey C; Teagle, Damon A H (2003): Hydrothermal alteration of upper oceanic crust formed at a fast-spreading ridge: mineral, chemical, and isotopic evidence from ODP Site 801. Chemical Geology, 201(3-4), 191-211

Jeffrey C Alt & Damon A H Teagle
ODP Hole 801C penetrates >400 m into 170-Ma oceanic basement formed at a fast-spreading ridge. Most basalts are slightly (10–20%) recrystallized to saponite, calcite, minor celadonite and iron oxyhydroxides, and trace pyrite. Temperatures estimated from oxygen isotope data for secondary minerals are 5–100°C, increasing downward. At the earliest stage, dark celadonitic alteration halos formed along fractures and celadonite, and quartz and chalcedony formed in veins from low-temperature (<100°C) hydrothermal fluids. Iron oxyhydroxides subsequently formed in...

Isotopic and chemical compositions of rocks and minerals from the TAG hydrothermal mound, ODP Site 957, supplement to: Teagle, Damon A H; Alt, Jeffrey C; Chiba, Hitoshi; Humphris, Susan E; Halliday, Alex N (1998): Strontium and oxygen isotopic constraints on fluid mixing, alteration and mineralization in the TAG hydrothermal deposit. Chemical Geology, 149(1), 1-24

Damon A H Teagle, Jeffrey C Alt, Hitoshi Chiba, Susan E Humphris & Alex N Halliday
Strontium- and oxygen-isotopic measurements of samples recovered from the Trans-Atlantic Geotraverse (TAG) hydrothermal mound during Leg 158 of the Ocean Drilling Program provide important constraints on the nature of fluid–rock interactions during basalt alteration and mineralization within an active hydrothermal deposit. Fresh Mid-Ocean Ridge Basalt (MORB), with a 87Sr/86Sr of 0.7026, from the basement beneath the TAG mound was altered at both low and high temperatures by seawater and altered at high temperature by near...

Magnetic susceptibility and documentation of sediment cores from the Antarctic Peninsula Pacific margin, supplement to: Lucchi, Renata G; Rebesco, Michele; Camerlenghi, Angelo; Busetti, M; Tomadin, Luciano; Villa, Giuliana; Persico, Davide; Morigi, Caterina; Bonci, M C; Giorgetti, Giovanna (2002): Mid-late Pleistocene glacimarine sedimentary processes of a high-latitude, deep-sea sediment drift (Antarctic Peninsula Pacific margin). Marine Geology, 189(3-4), 343-370

Renata G Lucchi, Michele Rebesco, Angelo Camerlenghi, M Busetti, Luciano Tomadin, Giuliana Villa, Davide Persico, Caterina Morigi, M C Bonci & Giovanna Giorgetti
The effects of glaciation on sediment drifts is recognised from marked sedimentary facies variation in deep sea cores taken from the continental rise of the Antarctic Peninsula Pacific margin. Nineteen sediment cores were visually described, logged for magnetic susceptibility, and X-radiographed. About 1000 analyses were performed for grain size, clay minerals and biostratigraphy (foraminifera, nannofossils and diatoms). Four sediment types associated with distinct sedimentary processes are recognised based on textural/compositional analysis. (1) Hemipelagic mud forms...

Rock magnetic susceptibility of ODP Leg 204 sites, supplement to: Larrasoaña, Juan C; Roberts, Andrew P; Musgrave, Robert J; Gràcia, Eulàlia; Piñero, Elena; Vega, Marta; Martinez-Ruiz, Francisca C (2007): Diagenetic formation of greigite and pyrrhotite in gas hydrate marine sedimentary systems. Earth and Planetary Science Letters, 261(3-4), 350-366

Juan C Larrasoaña, Andrew P Roberts, Robert J Musgrave, Eulàlia Gràcia, Elena Piñero, Marta Vega & Francisca C Martinez-Ruiz
Mineral magnetic results and electron microscope observations from gas hydrate-bearing marine sediments cored at southern Hydrate Ridge during Ocean Drilling Program Leg 204 (Sites 1244 to 1252, Cascadia Margin, offshore Oregon) demonstrate that authigenic greigite and pyrrhotite formed as a byproduct of microbially-mediated diagenetic reactions in the sulphate, the anaerobic oxidation of methane (AOM), and the methanic/gas hydrate zones. Geochemical conditions favourable for formation and preservation of greigite and pyrrhotite appear to be a limited...

Distribution of planktonic foraminifera in Quaternary sediments east of New Zealand

Philip PE Weaver, Lionel Carter & Helen L Neil
A series of cores from east of New Zealand have been examined to determine the paleoceanographic history of the late Quaternary in the SW Pacific using planktonic foraminiferal data. Distinct shifts of species can be seen between glacial and interglacial times especially south of Chatham Rise east of South Island. Foraminiferal fragmentation ratios and benthic/planktonic foraminiferal ratios both show increased dissolution during glacials, especially isotope stage 2 to the south of Chatham Rise. The present-day...

Strontium-isotope stratigraphy and oxygen- and carbon-isotope record of Middle Jurassic to Early Cretaceous belemnites in the South Atlantic, supplement to: Price, Gregory D; Gröcke, Darren R (2002): Strontium-isotope stratigraphy and oxygen- and carbon-isotope variation during the Middle Jurassic-Early Cretaceous of the Falkland Plateau, South Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology, 183(3-4), 209-222

Gregory D Price & Darren R Gröcke
87Sr/86Sr data of belemnites are presented from a Middle Jurassic-Early Cretaceous succession from the Falkland Plateau (Deep Sea Drilling Project Sites 511 and 330) that was deposited in a periodically anoxic, semi-enclosed shallow water basin. Diagenetically screened strontium-isotope values of 0.706789 rise to 0.707044 before increasing sharply to 0.707428 in the uppermost part of the sampled succession. Comparison with published strontium calibration curves suggests that the oldest samples were Callovian to Oxfordian in age, whilst...

Paleotemperature reconstructions from high Late Jurassic paleolatitudes, supplement to: Price, Gregory D; Sellwood, B W (1997): "Warm" palaeotemperatures from high Late Jurassic palaeolatitudes (Falkland Plateau): Ecological, environmental or diagenetic controls? Palaeogeography, Palaeoclimatology, Palaeoecology, 129(3-4), 315-327

Gregory D Price & B W Sellwood
Oxygen and carbon isotopes have been determined from Late Jurassic (Oxfordian-Tithonian) belemnites and inoceramid bivalves from two Deep Sea Drilling Project (DSDP) sites located on the Falkland Plateau. Mean belemnite delta18O values, derived from well preserved skeletal material, were -1.29‰ from DSDP site 330 and -1.45‰ from DSDP site 511. Assuming a seawater SMOW value of -1.0‰, mean palaeotemperatures calculated from the oxygen isotopic composition are 17.2°C and 17.9°C, respectively. The inoceramid bivalves yielded much...

Time-series of phytoplankton abundance and species composition in the Gulf of Naples in June 1999

Adriana Zingone & Diana Sarno
Phytoplankton abundances and species composition were analysed in the Gulf of Naples. Samples were takin in June 1999.

Time-series of phytoplankton abundance and species composition in the Gulf of Naples in March 1999

Diana Sarno & Adriana Zingone
Phytoplankton abundances and species composition were analysed in the Gulf of Naples. Samples were takin in March 1999.

Stable oxygen and carbon isotope ratios and paleotemperature reconstructions from Inoceramus in Cretaceous sediments of DSDP Sites, supplement to: Saltzman, Eric S; Barron, E J (1982): Deep circulation in the Late Cretaceous: oxygen isotope paleotemperatures from Inoceramus remains in D.S.D.P. cores. Palaeogeography, Palaeoclimatology, Palaeoecology, 40(1-3), 167-181

Eric S Saltzman & E J Barron
Inoceramus is an epibenthic bivalve which lived in a wide variety of paleoenvironments encompassing a broad range of paleodepths. A survey of all Cretaceous sediments from Deep Sea Drilling Project legs 1-69 and 75 revealed over 500 Inoceramus specimens at twenty sites. Of these, 47 well-preserved Late Cretaceous specimens from the South Atlantic, Pacific and Indian Oceans were analyzed for oxygen and carbon isotopes. The specimens exhibit small internal isotopic variability and oxygen isotopic paleotemperatures...

Age determination and stable isotope ratios of three sediment cores from the Great Belt, supplement to: Winn, Kyaw; Erlenkeuser, Helmut; Nordberg, Kjell; Gustafsson, Mikael (1998): Paleohydrography of the Great Belt, Denmark, during the Littorina Transgression: the isotope signal. Meyniana, 50, 237-251

Kyaw Winn, Helmut Erlenkeuser, Kjell Nordberg & Mikael Gustafsson
The marine transgression Into the Baltic Sea through the Great Belt took place around 9,370 calibrated C-14-years B.P. The sedimentary sequence from the early brackish phase and the change to marine conditions has been investigated in detail through C-14-datings, and oxygen and carbon isotope measurements, and is interpreted by comparison with modern analogs.The oldest brackish sediments are the strongly laminated clays and silts rich in organic carbon followed by non-laminated heavily bioturbated silts. The bedding...

Aeolian dust and chemistry records from the EDML and EDC ice cores, supplement to: Ruth, Urs; Barbante, Carlo; Bigler, Matthias; Delmonte, Barbara; Fischer, Hubertus; Gabrielli, Paolo; Gaspari, Vania; Kaufmann, Patrik R; Lambert, Fabrice; Maggi, Valter; Marino, Federica; Petit, Jean-Robert; Udisti, Roberto; Wagenbach, Dietmar; Wegner, Anna; Wolff, Eric W (2008): Proxies and measurement techniques for mineral dust in Antarctic ice cores. Environmental Science and Technology, 42(15), 5675-5681

Urs Ruth, Carlo Barbante, Matthias Bigler, Barbara Delmonte, Hubertus Fischer, Paolo Gabrielli, Vania Gaspari, Patrik R Kaufmann, Fabrice Lambert, Valter Maggi, Federica Marino, Jean-Robert Petit, Roberto Udisti, Dietmar Wagenbach, Anna Wegner & Eric W Wolff
To improve quantitative interpretation of ice core aeolian dust records a systematic methodical comparison has been made involving methods of water-insoluble particle counting (Coulter Counter and laser-sensing particle detector), soluble ions (ion chromatography, IC, and continuous flow analysis, CFA), elemental analysis (inductively coupled plasma mass spectroscopy, ICP-MS, at pH 1 and after full acid digestion), and water-insoluble elemental analysis (proton induced X-ray emission, PIXE). Ice core samples covering the last deglaciation have been used from...

Rare earth elements determined in Antarctic ice by inductively coupled plasma, supplement to: Dick, Dorothee; Wegner, Anna; Gabrielli, Paolo; Ruth, Urs; Barbante, Carlo; Kriews, Michael (2008): Rare earth elements determined in Antarctic ice by inductively coupled plasma-Time of flight, quadrupole and sector field-mass spectrometry: An inter-comparison study. Analytica Chimica Acta, 621(2), 140-147

Dorothee Dick, Anna Wegner, Paolo Gabrielli, Urs Ruth, Carlo Barbante & Michael Kriews
Inductively coupled plasma mass spectrometry (ICP-MS) is a suitable tool for multi-element analysis at low concentration levels. Rare earth element (REE) determinations in standard reference materials and small volumes of molten ice core samples from Antarctica have been performed with an ICP-time of flight-MS (ICP-TOF-MS) system. Recovery rates for REE in e.g. SPS-SW1 amounted to not, vert, similar ~103%, and the relative standard deviations were 3.4% for replicate analysis at REE concentrations in the lower...

Mid-Pliocene diatom and palynological assemblages north-northeast of Cape Adare, Antarctica, supplement to: Fleming, R Farley; Barron, John A (1996): Evidence of Pliocene Abthofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274). Marine Micropaleontology, 27(1-4), 227-236

R Farley Fleming & John A Barron
Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68°59.81'S, 173°2564'E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beach) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-274-6R-1, 83-87 cm to 28-274-11R-4, 73-77 cm (48.33-100.29 mbsf). Biostratigraphic study of the abundant diatom assemblages combined with published radiolarian data indicates that the sample interval ranges in age from 5.0...

Diatom constrains on the position of the Antarctic Polar Front in the middle part of the Pliocene, supplement to: Barron, John A (1996): Diatom constraints on the position of the Antarctic Polar Front in the middle part of the Pliocene. Marine Micropaleontology, 27(1-4), 195-213

John A Barron
The relative percentages of diatom taxa in 5 deep-sea cores (DSDP 266, ODP 699A, ODP 747A. ODP 751A, and Eltanin Core 50-28) from the Southern Ocean are determined for an interval centered on 3.1 to 2.9 Ma in the middle part of the Pliocene. This climatically warm interval, which is being studied by the PRISM Project of the U.S. Geological Survey, coincides with a proposed interval of major deglaciation of East Antarctica. The maximum southerly...

High resolution paleoceanography of the Guaymas Basin, Gulf of California, during the past 15000 yeras, supplement to: Barron, John A; Bukry, David; Bischoff, James L (2004): High resolution paleoceanography of the Guaymas Basin, Gulf of California, during the past 15 000 years. Marine Micropaleontology, 50(3-4), 185-207

John A Barron, David Bukry & James L Bischoff
Deep Sea Drilling Project Site 480 (27°54.10'N, 111°39.34'W; 655 m water depth) contains a high resolution record of paleoceanographic change of the past 15000 years for the Guaymas Basin, a region of very high diatom productivity within the central Gulf of California. Analyses of diatoms and silicoflagellates were completed on samples spaced every 40-50 yr, whereas ICP-AES geochemical analyses were completed on alternate samples (sample spacing 80-100 yr). The Bolling-Allerod interval (14.6-12.9 ka) (note, ka...

Revised Miocene and Pliocene diatom biostratigraphy of Upper Newport Bay, Newport Beach, California, supplement to: Barron, John A (1976): Revised Miocene and Pliocene diatom biostratigraphy of Upper Newport Bay, Newport Beach, California. Marine Micropaleontology, 1, 27-63

John A Barron
North Pacific diatom zones XXIII through IX of Schrader are recognizable in the middle Miocene to lower Pliocene stratigraphic section exposed around Upper Newport Bay in Newport Beach, California. Correlation with DSDP Site 173 and other stratigraphic sections in California allows the selection of diatom datums that are the most reliable for long-distance correlation. Individual diatom datums are proposed as markers for North Pacific diatom zones XXIII through IX.Correlations with DSDP Site 173 reveal a...

Latest Oligocene through early middle Miocene diatom biostratigraphy of the eastern tropical Pacific, supplement to: Barron, John A (1983): Latest Oligocene through early middle Miocene diatom biostratigraphy of the eastern tropical Pacific. Marine Micropaleontology, 7(6), 487-515

John A Barron
Study of DSDP Sites 71, 77, and 495 has allowed the development of a refined diatom biostratigraphy for the latest Oligocene through early middle Miocene of the eastern tropical Pacific which is well correlated to the low-latitude zonations for planktonic foraminifers, coccoliths, and radiolarians. Six zones and 7 subzones are proposed, and correlation with high-latitude diatoms zonations for the North Pacific, the Norwegian Sea, and the Southern Ocean is suggested by the discovery of selected...

Distribution of Pliocene diatom faunas in the Northwest Pacific, supplement to: Barron, John A (1992): Pliocene paleoclimatic interpretation of DSDP Site 580 (NW Pacific) using diatoms. Marine Micropaleontology, 20(1), 23-44

John A Barron
High-resolution quantitative diatom data are tabulated for the early part of the late Pliocene ( 3.25 to 2.08 Ma ) at DSDP Site 580 in the northwestern Pacific. Sample spacing averages 11 k.y. between 3.1 and 2.8 Ma, but increases to 14 to 19 k.y. prior to 3.1 Ma and after 2.8 Ma. Q-mode factor analysis of the middle Pliocene assemblage reveals four factors which explain 92.4% of the total variance of the 47 samples...

Macerals in sediments, supplement to: Boucsein, Bettina; Stein, Ruediger (2008): Black shale formation in the late Paleocene/early Eocene Arctic Ocean and paleoenvironmental conditions: New results from a detailed organic petrological study. Marine and Petroleum Geology

Bettina Boucsein & Ruediger Stein
The study of particulate organic matter (OM) in Arctic Ocean sediments from the Late Cretaceous to the Eocene (IODP Expedition 302) has revealed detailed information about the aquatic/marine OM fluxes, biological sources, preservation and export of terrestrial material. Here, we present detailed data from maceral analysis, vitrinite reflectance measurements and organic geochemistry.During the Campanian/Paleocene, fluxes of land-derived OM are indicated by reworked and oxidized macerals (vitrinite, inertinite) and terrigenous liptinite (cutinite, sporinite). In the Early...

Core correlation data and revised composite depth scale of Exp302 (ACEX) cores, supplement to: O'Regan, Matthew; Sakamoto, Tatsuhiko; King, John W (2008): Data report: Regional stratigraphic correlation and a revised composite depth scale for IODP Expedition 302. In: Backman, J., Moran, K., McInroy, D.B., Mayer, L.A., and the Expedition 302 Scientists, Proc. IODP, 302: Edinburgh (Integrated Ocean Drilling Program Management International, Inc.).

Matthew O'Regan, Tatsuhiko Sakamoto & John W King
Expedition 302 of the Integrated Ocean Drilling Program (IODP), also known as the Arctic Coring Expedition (ACEX), successfully penetrated a sequence of Cenozoic sediments draping the crest of the Lomonosov Ridge in the central Arctic Ocean. The cumulative sedimentary record spans the last 57 m.y. and was recovered from three sites located within 15 km of each other. Merging the recovered cores onto a common depth scale that accurately reflects their stratigraphic placement below the...

X-ray diffraction analysis of sediment cores from the ACEX expedition to the Arctic Ocean, supplement to: Vogt, Christoph (2009): Data report: semiquantitative determination of detrital input to ACEX sites based on bulk sample X-ray diffraction data. In: Backman, J., Moran, K., McInroy, D.B., Mayer, L.A., and the Expedition 302 Scientists, Proc. IODP: Edinburgh (Integrated Ocean Drilling Program Management International, Inc.), 302

Christoph Vogt
This data report extents the X-ray diffraction (XRD) work reported in the Scientific Results Volume from ~ 200 samples to 1555 investigated bulk powder samples. The unique central Arctic Ocean samples of the International Ocean Drilling Program (IODP) Leg 302 Arctic Coring Expedition (ACEX), the first mission specific platform Leg, were collected and prepared by different German groups and provided to the Central Laboratory for Crystallography and Applied Material Sciences, Geosciences, University of Bremen. This...

Age control and stratigraphy of a sediment profile from the Lomonosov Ridge, Arctic Ocean, supplement to: Backman, Jan; Jakobsson, Martin; Frank, Martin; Sangiorgi, Francesca; Brinkhuis, Henk; Stickley, Catherine E; O'Regan, Matthew; Løvlie, Reidar; Pälike, Heiko; Spofforth, David J A; Gattacceca, Jérôme; Moran, Kathryn; King, John W; Heil, Chip (2008): Age model and core-seismic integration for the Cenozoic Arctic Coring Expedition sediments from the Lomonosov Ridge. Paleoceanography, 23(1), PA1S03

Jan Backman, Martin Jakobsson, Martin Frank, Francesca Sangiorgi, Henk Brinkhuis, Catherine E Stickley, Matthew O'Regan, Reidar Løvlie, Heiko Pälike, David J A Spofforth, Jérôme Gattacceca, Kathryn Moran, John W King & Chip Heil
The upper 200 m of the sediments recovered during IODP Leg 302, the Arctic Coring Expedition (ACEX), to the Lomonosov Ridge in the central Arctic Ocean consist almost exclusively of detrital material. The scarcity of biostratigraphic markers severely complicates the establishment of a reliable chronostratigraphic framework for these sediments, which contain the first continuous record of the Neogene environmental and climatic evolution of the Arctic region. Here we present profiles of cosmogenic 10Be together with...

Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses, supplement to: Spofforth, David J A; Pälike, Heiko; Green, Darryl R H (2008): Paleogene record of elemental concentrations in sediments from the Arctic Ocean obtained by XRF analyses. Paleoceanography, 23(1), PA1S09

David J A Spofforth, Heiko Pälike & Darryl R H Green
We present a high-resolution X-ray fluorescence (XRF) core scanner record for the expanded middle Eocene section from Integrated Ocean Drilling Program (IODP) Expedition 302 (ACEX) drilled on the Lomonosov Ridge, central Arctic Ocean. The division of the middle Eocene into two units (subunit 1/6 and unit 2) is seen in the cyclical behavior of the elements as well as the changing interelemental correlations and their relationship to physical property measurements of bulk sediment. Al, Ti,...

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