703 Works

High-resolution sediment record from a submarine meandering canyon system in the eastern Atlantic, supplement to: Zühlsdorff, Christine; Hanebuth, Till J J; Henrich, Rüdiger (2008): Persistent quasi-periodic turbidite activity off Saharan Africa and its comparability to orbital and climate cyclicities. Geo-Marine Letters, 28(2), 87-95

Christine Zühlsdorff, Till J J Hanebuth & Rüdiger Henrich
Based on a high-resolution sediment record from a submarine meandering canyon system offshore the present-day hyperarid Saharan Africa, two phases of turbidity-current activity can be distinguished during the past 13,000 years. Frequent, siliciclastic turbidity currents can be related to deglacial sea-level history, whereas rhythmically recurring fine-grained and carbonate-rich turbidity currents with recurrence times of roughly 900 years are inferred for the Holocene. Various trigger mechanisms can be considered to initiate turbidity currents, but only a...

Carbon, boron and oxygen isotope ratios of sediments from the Moresby Seamount, supplement to: Kopf, Achim J; Behrmann, Jan Hinrich; Deyhle, Annette; Roller, Sybille; Erlenkeuser, Helmut (2003): Isotopic evidence (B, C, O) of deep fluid processes in fault rock from the active Woodlark Basin detachment zone. Earth and Planetary Science Letters, 208(1-2), 51-68

Achim J Kopf, Jan Hinrich Behrmann, Annette Deyhle, Sybille Roller & Helmut Erlenkeuser
We report results from boron, carbon and oxygen stable isotope analyses of faulted and veined rocks recovered by scientific ocean drilling during ODP Leg 180 in the western Woodlark Basin, off Papua New Guinea. In this area of active continental extension, crustal break-up and incipient seafloor spreading, a shallow-dipping, seismically active detachment fault accommodates strain, defining a zone of mylonites and cataclasites, vein formation and fluid infiltration. Syntectonic microstructures and vein-fill mineralogy suggest frictional heating...

Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic, supplement to: Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut (2006): Variability of the Denmark Strait Overflow during the Last Glacial Maximum. Boreas, 35(1), 50-60

Christian Millo, Michael Sarnthein, Antje H L Voelker & Helmut Erlenkeuser
The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed...

Age determination of sediment cores close to the Strait of Gibralta, supplement to: Zahn, Rainer; Sarnthein, Michael; Erlenkeuser, Helmut (1987): Benthic isotope evidence for changes of the mediterrranean outflow during the late Quaternary. Paleoceanography, 2(6), 543-559

Rainer Zahn, Michael Sarnthein & Helmut Erlenkeuser
A suit of sediment cores close to and south of the Strait of Gibraltar (12°-36°N, 500-2800 m water depth) were analyzed for stable isotopes in epibenthic foraminifers Cibicidoides wuellerstorfi and Planulina ariminensis. During peak glacial times, the data exhibit higher delta13C values of up to 1.6 per mil at intermediate depths near the Strait of Gibraltar (36°N). The values decrease to the south as evidenced by our data, but also to the north as revealed...

Age determination and sedimentation rates of sediment cores in the Laptev Sea, supplement to: Bauch, Henning A; Kassens, Heidemarie; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Thiede, Jörn (1999): Depositional environment of the Laptev Sea (Arctic Siberia) during the Holocene. Boreas, 28(1), 194-204

Henning A Bauch, Heidemarie Kassens, Helmut Erlenkeuser, Pieter Meiert Grootes & Jörn Thiede
The Holocene depositional setting of the Laptev Sea was studied using three marine sediment cores from water depths between 77 and 46 m. Based on sedimentary parameters (TOC content, delta13Corg, sedimentation rates) controlled by radiocarbon age models the palaeoenvironment of a strongly coupled river-shelf system was reconstructed since ~11 ka BP. Caused by a transgressing sea after the last glaciation, all cores reveal progressive decreases in sedimentation rates. Using the sedimentary records of a core...

Sea surface temperatures and UK37 of three sediment cores from the Arctic Ocean, supplement to: Bauch, Henning A; Erlenkeuser, Helmut; Fahl, Kirsten; Spielhagen, Robert F; Weinelt, Mara; Andruleit, Harald; Henrich, Rüdiger (1999): Evidence for a steeper Eemian than Holocene sea surface temperature gradient between Arctic and sub-Arctic regions. Palaeogeography, Palaeoclimatology, Palaeoecology, 145(1-3), 95-117

Henning A Bauch, Helmut Erlenkeuser, Kirsten Fahl, Robert F Spielhagen, Mara Weinelt, Harald Andruleit & Rüdiger Henrich
Sediment proxy data from the Norwegian, Greenland, and Iceland seas (Nordic seas) are presented to evaluate surface water temperature (SST) differences between Holocene and Eemian times and to deduce from these data the particular mode of surface water circulation. Records from planktic foraminiferal assemblages, CaCO3 content, oxygen isotopes of foraminifera, and iceberg-rafted debris form the main basis of interpretation. All results indicate for the Eemian comparatively cooler northern Nordic seas than for the Holocene due...

Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf, supplement to: Andrews, John T; Erlenkeuser, Helmut; Evans, L W; Briggs, W M; Jull, A J Timothy (1991): Meltwater and deglaciation, SE Baffin Shelf (NE margin Laurentide Ice Sheet) between 13.5 and 7 ka: from O and C isotopic data. Paleoceanography, 6(5), 621-637

John T Andrews, Helmut Erlenkeuser, L W Evans, W M Briggs & A J Timothy Jull
Stable isotopic values on planktonic foraminifera in a suite of cores from basins across the SE Baffin Shelf are used to extract a record of meltwater events during Termination I deglaciation. Resolution and Hatton basins lie on the SE Baffin Shelf at water depths > 500 m, seaward of major conduits for ice drainage from the eastern sector of the Laurentide Ice Sheet (LIS). Accelerator mass spectrometry 14C dates are used to constrain our chronology...

Organic carbon concentrations and isotope ratios of sediments from the Laptev Sea, supplement to: Müller-Lupp, Thomas; Bauch, Henning A; Erlenkeuser, Helmut; Hefter, Jens; Kassens, Heidemarie; Thiede, Jörn (2000): Changes in the deposition of terrestrial organic matter on the Laptev Sea shelf during the Holocene: evidence from stable carbon isotopes. International Journal of Earth Sciences, 89(3), 563-568

Thomas Müller-Lupp, Henning A Bauch, Helmut Erlenkeuser, Jens Hefter, Heidemarie Kassens & Jörn Thiede
Stable carbon isotope ratios in the organic fraction of surface sediments from the Laptev Sea shelf were analyzed in order to study the modern distribution pattern of terrestrial organic matter. The delta13Corg signature of the surface sediments range from -26.6 per mil near the coastal margin to -22.8 per mil in the north towards the outer shelf. Characterizing the possible sources of organic matter by their delta13Corg signature reveals that the terrestrial influence reaches further...

Age determinations of sediment cores from the Baffin Shelf, supplement to: Andrews, John T; Evans, L W; Williams, Kerstin M; Briggs, W M; Jull, A J Timothy; Erlenkeuser, Helmut; Hardy, Iris A (1990): Cryosphere/ocean interactions at the margin of the Laurentide ice sheet during the Younger Dryas chron: SE Baffin Shelf, Northwest Territories. Paleoceanography, 5(6), 921-935

John T Andrews, L W Evans, Kerstin M Williams, W M Briggs, A J Timothy Jull, Helmut Erlenkeuser & Iris A Hardy
Cores HU82-034-057 and HU84-035-008, Resolution Basin, SE Baffin Shelf, contain 200 and 450 cm, respectively, of sediment that spans the Younger Dryas chron. In both cores the interval is bracketed by 14C dates on foraminifera or molluscs. These sites were close to the margin of the late Wisconsin (Foxe) ice sheet as it flowed toward the Labrador Sea. Prior to 11 ka, both cores record moderate to high accumulations of foraminifera, relatively high del 18O...

Sedimentology and geochemistry of core GIK23258-2 in the Barents Sea, supplement to: Sarnthein, Michael; van Kreveld, Shirley A; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Kucera, Michal; Pflaumann, Uwe; Schulz, Michael (2003): Centennial-to-millennial-scale periodicities of Holocene climate and sediment injections off western Barents shelf, 75°N. Boreas, 32(3), 447-461

Michael Sarnthein, Shirley A van Kreveld, Helmut Erlenkeuser, Pieter Meiert Grootes, Michal Kucera, Uwe Pflaumann & Michael Schulz
At the western continental margin of the Barents Sea, 75°N, hemipelagic sediments provide a record of Holocene climate change with a time resolution of 10-70 years. Planktic foraminifera counts reveal a very early Holocene thermal optimum 10.7-7.7 kyr BP, with summer sea surface temperatures (SST) of 8°C and a much enhanced West Spitsbergen Current. There was a short cooling between 8.8 and 8.2 kyr BP. In the middle and late Holocene summer, SST dropped to...

Mineral, chemical and isotopic analyses of the oceanic crust of ODP Hole 148-896A, supplement to: Teagle, Damon A H; Alt, Jeffrey C; Bach, Wolfgang; Halliday, Alex N; Erzinger, Jörg (1996): Alteration of upper ocean crust in a ridge-flank hydrothermal upflow zone: mineral, chemical, and isotopic constraints from Hole 896A. In: Alt, J.C., Kinoshita, H., Stokking, L.B., and Michael, P.J. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 148, 119-150

Damon A H Teagle, Jeffrey C Alt, Wolfgang Bach, Alex N Halliday & Jörg Erzinger
Hole 896A penetrates into the upper volcanic section of a ridge-flank hydrothermal upflow zone. Analyses of the secondary mineralogy and chemistry, whole-rock geochemistry, and oxygen, carbon, and strontium isotope ratios of whole rocks and secondary minerals were conducted to constrain the chemical and thermal evolution of hydrothermal alteration and its effects on the upper crust at Site 896.Celadonite +/- Fe-oxyhydroxides are the earliest secondary minerals and formed at low temperatures. The crust was open to...

Strontium chemistry of anhydrite from DSDP/ODP Hole 504B, supplement to: Teagle, Damon A H; Alt, Jeffrey C; Halliday, Alex N (1998): Tracing the chemical evolution of fluids during hydrothermal recharge: Constraints from anhydrite recovered in ODP Hole 504B. Earth and Planetary Science Letters, 155(3-4), 167-182

Damon A H Teagle, Jeffrey C Alt & Alex N Halliday
A unique record of the chemical evolution of seawater during hydrothermal recharge into oceanic crust is preserved by anhydrite from the volcanic sequences and sheeted dike complex in ODP Hole 504B. Chemical and isotopic analyses 87Sr/86Sr, delta18O, delta34S of anhydrite constrain the changing composition of fluids due to reaction with basalt. There is a general trend of decreasing 87Sr/86Sr of anhydrite, corresponding to the minor incorporation of basaltic strontium with depth in the volcanic rocks....

Lithium concentrations and isotope composition of basalt samples from ODP/DSDP Sites from Costa Rica Rift, supplement to: Chan, Lui-Heung; Alt, Jeffrey C; Teagle, Damon A H (2002): Lithium and lithium isotope profiles through the upper oceanic crust: a study of seawater-basalt exchange at ODP Sites 504B and 896A. Earth and Planetary Science Letters, 201(1), 187-201

Lui-Heung Chan, Jeffrey C Alt & Damon A H Teagle
Ocean Drilling Program (ODP) Hole 504B near the Costa Rica Rift is the deepest hole drilled in the ocean crust, penetrating a volcanic section, a transition zone and a sheeted dike complex. The distribution of Li and its isotopes through this 1.8-km section of oceanic crust reflects the varying conditions of seawater alteration with depth. The upper volcanic rocks, altered at low temperatures, are enriched in Li (5.6-27.3 ppm) and have heavier isotopic compositions (delta7Li=6.6-20.8...

Late Triassic palynology of the Wombat Plateau, northwestern Australia, supplement to: Brenner, Wolfram W (1992): First results of Late Triassic palynology of the Wombat Plateau, northwestern Australia. In: von Rad, U; Haq, BU; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 122, 413-426

Wolfram W Brenner
Cores from Leg 122, Sites 759, 760, 761, and 764, were sampled at intervals of one sample per 1.5-m section in the Upper Triassic sequences. Spores, pollen, acritarchs, freshwater algae, and dinoflagellate cysts were studied to establish a palynostratigraphic framework for the Late Triassic.The palynological sequence is interpreted in terms of Australian spore-pollen zones: the Carman Samaropollenites speciosus Zone, the Norian Minutosaccus crenulatus Zone, and the Rhaetian Ashmoripollis reducta Zone. The Samaropollenites speciosus Zone-Minutosaccus crenulatus...

Isotopic composition of different sediments size fractions and vermiculites from ODP holes in the Bengal Fan, supplement to: Derry, Louis A; France-Lanord, Christian (1996): Neogene Himalayan weathering history and river 87Sr/ 86Sr: impact on the marine Sr record. Earth and Planetary Science Letters, 142(1-2), 59-74

Louis A Derry & Christian France-Lanord
Clastic sediments in the Bengal Fan contain a Neogene history of erosion and weathering of the Himalaya. We present data on clay mineralogy, major element, stable and radiogenic isotope abundances from Lower Miocene-Pleistocene sediments from ODP Leg 116. Nd and Sr isotope data show that the Himalayan provenance for the eroded material has varied little since > 17 Ma. However, from 7 to 1 Ma smectite replaces illite as the dominant clay, while sediment accumulation...

Age determinations from northwest Russia, supplement to: Larsen, Eiliv; Lyså, Astrid; Demidov, Igor; Funder, Svend; Houmark-Nielsen, Michael; Kjær, Kurt Henrik; Murray, Andrew Sean (1999): Age and extent of the Scandinavian ice sheet in northwest Russia. Boreas, 28(1), 115-132

Eiliv Larsen, Astrid Lyså, Igor Demidov, Svend Funder, Michael Houmark-Nielsen, Kurt Henrik Kjær & Andrew Sean Murray
The last glacial maximum (LGM) of the Scandinavian ice sheet in the Arkhangelsk region has been identified morphologically as ridges and hummocks in an otherwise flat topography. Stratigraphically the limit is marked by the presence of till above Mikhulinian (last interglacial) sediments inside the ridges and by the absence of till outside the ridges. During the LGM, ice flowed into the region from the north and northwest forming a lobe in the Dvina--Vaga depression. The...

Age determination of sediment from Lake Komi, supplement to: Mangerud, Jan; Astakhov, Valery I; Murray, Andrew Sean; Svendsen, John Inge (2001): The chronology of a large ice-dammed lake and the Barents-Kara ice sheet advances, northern Russia. Global and Planetary Change, QUEEN special issue, 31(1), 321-336

Jan Mangerud, Valery I Astakhov, Andrew Sean Murray & John Inge Svendsen
Beach and shoreface sediments deposited in the more than 800-km long ice-dammed Lake Komi in northern European Russia have been investigated and dated. The lake flooded the lowland areas between the Barents-Kara Ice Sheet in the north and the continental drainage divide in the south. Shoreline facies have been dated by 18 optical stimulated luminescence (OSL) dates, most of which are closely grouped in the range 80-100 ka, with a mean of 88 +/- 3...

Sedimentology and stable oxygen isotope ratios of foraminifera from cores of the Porcupine Seabight, Northeast Atlantic, supplement to: Rüggeberg, Andres; Dorschel, Boris; Dullo, Wolf Christian; Hebbeln, Dierk (2005): Sedimentary patterns in the vicinity of a carbonate mound in the Hovland Mound Province, northern Porcupine Seabight. In: Freiwald, A & Roberts, JM (eds.), 2005, Cold-water Corals and Ecosystems, Springer-Verlag, Berlin, Heidelberg, 87-112

Andres Rüggeberg, Boris Dorschel, Wolf Christian Dullo & Dierk Hebbeln
Large carbonate mound structures have been discovered in the northern Porcupine Seabight (Northeast Atlantic) at depths between 600 and 1000 m. These mounds are associated with the growth of deep-sea corals Lophelia pertusa and Madrepra oculata. In this study, three sediment cores have been analysed. They are from locations close to Propeller Mound, a 150 m high ridge-like feature covered with a cold-water coral ecosystem at its upper flanks. The investigations are concentrated on grain-size...

Benthic foraminifera, stable isotope ratios and carbon concentrations of sediment cores from Propeller Mound and Porcupine Srabight, supplement to: Rüggeberg, Andres; Dullo, Wolf Christian; Dorschel, Boris; Hebbeln, Dierk (2007): Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight). International Journal of Earth Sciences, 96(1), 57-72

Andres Rüggeberg, Wolf Christian Dullo, Boris Dorschel & Dierk Hebbeln
On- and off-mound sediment cores from Propeller Mound (Hovland Mound province, Porcupine Seabight) were analysed to understand better the evolution of a carbonate mound. The evaluation of benthic foraminiferal assemblages from the off-mound position helps to determine the changes of the environmental controls on Propeller Mound in glacial and interglacial times. Two different assemblages describe the Holocene and Marine Isotope Stage (MIS) 2 and late MIS 3 (~31 kyr BP). The different assemblages are related...

Stable oxygen isotope ratios and grain size analyses of sediment cores from the Propeller Mound, Northeast Atlantic, supplement to: Dorschel, Boris; Hebbeln, Dierk; Rüggeberg, Andres; Dullo, Wolf Christian; Freiwald, André (2005): Growth and Erosion of a Cold-Water Coral Covered Carbonate Mound in the Northeast Atlantic during the Late Pleistocene and Holocene. Earth and Planetary Science Letters, 233(1-2), 33-44

Boris Dorschel, Dierk Hebbeln, Andres Rüggeberg & Wolf Christian Dullo
The first detailed stratigraphic record from a deep-water carbonate mound in the Northeast Atlantic based on absolute datings (U/Th and AMS 14C) and stable oxygen isotope records reveals that its top sediment sequences are condensed by numerous hiatuses. According to stable isotope data, mainly sediments with an intermediate signal are preserved on the mound, while almost all fully glacial and interglacial sediments have either not been deposited or have been eroded later. The resulting hiatuses...

Planktonic foraminiferal abundance and flux in the Porcupine Seabight, Northeast Atlantic

Almuth Harbers, Joachim Schönfeld, Andres Rüggeberg & Olaf Pfannkuche
Modern planktonic foraminifera collected with a sediment trap and subfossil assemblages from surface sediments from Galway Mound in the Porcupine Seabight off southwestern Ireland, northeastern Atlantic, were studied to show recent assemblage variations. The sediment trap operated from April to August 2004 and covers the spring bloom and early summer conditions with sampling intervals of 8 days. Eleven different species were recorded. Glorotalia hirsuta, Turborotalita quinqueloba and Globigerinita glutinata appeared predominately in spring. Neogloboquadrina incompta,...

Carbonate sedimentology of the Propeller Mound, Northeast Atlantic, supplement to: Dorschel, Boris; Hebbeln, Dierk; Rüggeberg, Andres; Dullo, Wolf Christian (2007): Carbonate budget of a cold-water coral carbonate mound: Propeller Mound, Porcupine Seabight. International Journal of Earth Sciences, 96(1), 73-83

Boris Dorschel, Dierk Hebbeln, Andres Rüggeberg & Wolf Christian Dullo
High resolution studies from the Propeller Mound, a cold-water coral carbonate mound in the NE Atlantic, show that this mound consists of >50% carbonate justifying the name "carbonate mound". Through the last ~300,000 years approximately one third of the carbonate has been contributed by cold-water corals, namely Lophelia pertusa and Madrepora oculata. This coral bound contribution to the carbonate budget of Propeller Mound is probably accompanied by an unknown portion of sediments buffered from suspension...

Chemistry and age determination of basement fluids from Juan de Fuca Ridge, supplement to: Elderfield, Henry; Wheat, C Geoffrey; Mottl, Michael J; Monnin, Christophe; Spiro, Baruch (1999): Fluid and geochemical transport through oceanic crust: a transect across the eastern flank of the Juan de Fuca Ridge. Earth and Planetary Science Letters, 172(1-2), 151-165

Henry Elderfield, C Geoffrey Wheat, Michael J Mottl, Christophe Monnin & Baruch Spiro
The geochemical implications of thermally driven flow of seawater through oceanic crust on the mid-ocean ridge flank have been examined on a well-studied 80 km transect across the eastern flank of the Juan de Fuca Ridge at 48°N, using porewater and basement fluid samples obtained on ODP Leg 168. Fluid flow is recognised by near-basement reversals in porewater concentration gradients from altered values in the sediment section to seawater-like values in basaltic basement. In general,...

Fluid compositions and mineralogy of precipitates from Mid Atlantic Ridge hydrothermal vents at 4°48'S

Karsten M Haase, Sven Petersen, Andrea Koschinsky, Richard Seifert, Colin W Devey, Robin Keir, Klas S Lackschewitz, Bernd Melchert, Kerstin Perner, Oliver Schmale, J Süling, Nicole Dubilier, Frank Zielinski, Susanne Fretzdorff, Carl-Dieter Garbe-Schönberg, Ulrike Westernstroer, Christopher R German, Timothy M Shank, Dana Yoerger, Olav Giere, Jan Küver, Herwig Marbler, Jule Mawick, Christian Mertens, Uwe Stöber … & Stefan Weber
The effect of volcanic activity on submarine hydrothermal systems has been well documented along fast- and intermediate-spreading centers but not from slow-spreading ridges. Indeed, volcanic eruptions are expected to be rare on slow-spreading axes. Here we report the presence of hydrothermal venting associated with extremely fresh lava flows at an elevated, apparently magmatically robust segment center on the slow-spreading southern Mid-Atlantic Ridge near 5°S. Three high-temperature vent fields have been recognized so far over a...

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  • 2009
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  • PANGAEA
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  • ETH Zürich Research Collection
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