75 Works

Hysteresis measurements (uncorrected and corrected for the paramagnetic influence) for VER98-1-1 at core depth of 580.6cm.

Francois Demory, Hedi Oberhänsli, Norbert Nowaczyk, Matthias Gottschalk, Richard Wirth & Rudolf Naumann
Hysteresis measurements of a hematite dominated diatomaceous layer with pseudosingle to multidomain behaviour of the hysteresis loop for VER98-1-1.

SAFOD Main Hole downhole logging data phase 1.1

SAFOD
SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD will drill and instrument an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. The drill site is located west of the vertical San Andreas Fault on a segment of the fault that moves through a combination of...

Downcore variations of total sulphur for VER98-1-14

Francois Demory, Hedi Oberhänsli, Norbert Nowaczyk, Matthias Gottschalk, Richard Wirth & Rudolf Naumann
Higher abundance of greigite during glacial intervals coincides with small increases of the S content (Fig. 11B). Greigite levels in glacial sediments cannot be correlated between cores (Fig. 12), which suggests that greigite concentrations are driven by local processes. We suggest that faecal pellets could be a suitable microenvironment for sulphate reduction. And while greigite could potentially act as proxy for faecal pellets in glacial sediments, unfortunately, we cannot rely on this possible indicator since...

Densities of benthic taxa with depth (CON 01-01 and CON 01-04 expeditions).

Patrick Martin, Xavier Boes, Boudewijn Goddeeris & Natalie Fagel
In all abyssal stations, densities are never over an average of c. 3100 individuals m−2 (Fig. 3, Table 1). In contrast, the shallow station (CON01-427, Posolskoe Bank) harbours the highest observed densities (oligochaetes reach densities as high as 13573 individuals m−2 on average). Gammarids are present in this latter station at 128 m deep, while they are absent from all deep stations. The presence of some groups is anecdotal, such as Hydrachnidia (one specimen in...

A new bathymetric map of Lake Baikal

M. De Batist, M. Canals, P. Sherstyankin, S. Alekseev & INTAS Project 99-1669 Team
In 1999 it was decided to create an international team of specialists and combine efforts and expertise to produce a new, more accurate bathymetric map of Lake Baikal. The aim was to re-compile the original sounding data that were used for the 1992 maps, to digitise them, to correct them using up-to-date, calibrated acoustic velocity information, to integrate them with as much as possible of the more recently acquired sounding data, and to produce a...

Petrophysical and temperature logging in the ICDP AIG10 borehole (Greece)

A. Förster, H. Hötzl, D. Rettenmaier & J. Kück
Several geophysical logs were obtained in 2002 in the AIG10 borehole. One set of logs (FMI, UBI, and DSI) were measured by Schlumberger in the deep, open-hole part of the borehole (Daniel et al., 2004; Prioul et. al., 2004). GFZ and ICDP OSG performed two logging campaigns with GFZ standard logging tools (Mud Parameter, SGR, GR-BCS-DIL and MSFL). The first campaign covered the section to a depth of 708 m (depth of casing), the second...

SAFOD Main Hole downhole logging data phase 1.2 1744-1932m

SAFOD
SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD will drill and instrument an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. The drill site is located west of the vertical San Andreas Fault on a segment of the fault that moves through a combination of...

SAFOD Main Hole downhole logging data phase 1.2 1556-1744m

SAFOD
SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD will drill and instrument an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. The drill site is located west of the vertical San Andreas Fault on a segment of the fault that moves through a combination of...

SAFOD Main Hole downhole logging data phase 1.2 1368-1556m

SAFOD
SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD will drill and instrument an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. The drill site is located west of the vertical San Andreas Fault on a segment of the fault that moves through a combination of...

SAFOD borehole trajectory data in absolute coordinates (UTM) and in coordinates relative to drilling platform

SAFOD
SAFOD is motivated by the need to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. SAFOD will drill and instrument an inclined borehole across the San Andreas Fault Zone to a depth of 3.2 km, targeting a repeating microearthquake source. The drill site is located west of the vertical San Andreas Fault on a segment of the fault that moves through a combination of...

Vertical distribution in the sediment of the different animal groups found in station CON01-433 (Vydrino Shoulder) in the abyssal zone of Lake Baikal, expressed as the number of individuals per m2.

Patrick Martin, Xavier Boes, Boudewijn Goddeeris & Natalie Fagel
The vertical distribution of organisms in the sediment indicates that animals can be present as deep as 15 cm although at very low abundance at such depths (Fig. 4, Fig. 5 and Fig. 6). Oligochaetes and nematods are the only groups able to deeply penetrate into the sediment at significant densities (Fig. 4) in contrast to all other groups, which stay closer to the sediment surface. Maximal densities however seem to shift to the sediment...

Vertical distribution in the sediment of the different animal groups found in station CON01-416 (Continent Ridge) in the abyssal zone of Lake Baikal, expressed as the number of individuals per m2.

Patrick Martin, Xavier Boes, Boudewijn Goddeeris & Natalie Fagel
The vertical distribution of organisms in the sediment indicates that animals can be present as deep as 15 cm although at very low abundance at such depths (Fig. 4, Fig. 5 and Fig. 6). Oligochaetes and nematods are the only groups able to deeply penetrate into the sediment at significant densities (Fig. 4) in contrast to all other groups, which stay closer to the sediment surface. Maximal densities however seem to shift to the sediment...

Vertical distribution in the sediment of the different animal groups found in station CON01-427 (Posolskoe Bank) in the dimictic zone of Lake Baikal, expressed as the number of individuals per m2.

Patrick Martin, Xavier Boes, Boudewijn Goddeeris & Natalie Fagel
The vertical distribution of organisms in the sediment indicates that animals can be present as deep as 15 cm although at very low abundance at such depths (Fig. 4, Fig. 5 and Fig. 6). Oligochaetes and nematods are the only groups able to deeply penetrate into the sediment at significant densities (Fig. 4) in contrast to all other groups, which stay closer to the sediment surface. Maximal densities however seem to shift to the sediment...

Diatom-inferred snow accumulation models for BAIK38 (BAIK94-38A) using uncorrected and corrected relative abundance data of five dominant phytoplankton species.

Anson Mackay, D. Ryves, Rick Battarbee, Roger Flower, David Jewson, Patrick Rioual & Michael Sturm
Diatom-inferred snow depth reconstructions for BAIK38 using uncorrected taxa (Fig. 5a–c) show similar trends throughout the study period, with all or only five taxa in the model; snow depth levels are marginally higher in zone 2 in comparison to zones 1 and 3. However, error values are large in comparison to the changes observed. The snow depth reconstruction using corrected diatom abundances (Fig. 5d) shows a somewhat different response. Low values characterise the period coincident...

Relative percentage diatom profile for BAIK94-38A using corrected values for dominant phytoplankton in the sedimentary record recalculated to sum to 100%.

Anson Mackay, D. Ryves, Rick Battarbee, Roger Flower, David Jewson, Patrick Rioual & Michael Sturm
Preservation differences can be used as correction factors to recalculate the relative abundances of each of the five dominant plankton taxa in BAIK38 and are depicted in Fig. 4. The resulting profile shows that Synedra acus is now the dominant taxa in zone 1 of the core, with other taxa being present at abundances generally less than 10%. At the zone 1/2 boundary, S. acus declines and is replaced by Cyclotella minuta and, to a...

Relative percentage diatom profile for BAIK38 (BAIK94-38A), using uncorrected taxa. The core has been dated using 210Pb analysis (to c. 1840 AD), and subsequent dates have been extrapolated—see text for details. Zones are defined using cluster analysis.

Anson Mackay, D. Ryves, Rick Battarbee, Roger Flower, David Jewson, Patrick Rioual & Michael Sturm
Fig. 3 is the diatom stratigraphy of dominant phytoplankton taxa for BAIK38 expressed as relative percentages, plotted against the age scale. Zone 1 (c. 880 AD–c. 1180 AD) is dominated throughout by the autumnal blooming species Cyclotella minuta, while Aulacoseira baicalensis and Synedra acus (both of which bloom in spring) are also present in lower but similar proportions (c. 15%). Zone 2 (c. 1180 AD–1840 AD) is characterised by an increase in C. minuta values...

Percent DW and %LOI values for the surface sediment core taken at site BAIK38 (BAIK94-38A).

Anson Mackay, D. Ryves, Rick Battarbee, Roger Flower, David Jewson, Patrick Rioual & Michael Sturm
Samples were routinely analysed for wet density (WD), percentage dry weight (%DW) at 105 °C, and loss-on-ignition analysis (LOI) at 550 °C, and data used to calculate diatom accumulation rates (DAR) in the sediment core. LOI is an approximation of organic content in sediment cores (Bengtsson and Enell, 1986). Each sample was prepared for diatom analysis using the procedure outlined in Mackay et al. (1998), minimizing additional dissolution of valves by omitting chemical pretreatments during...

Concentration data of NO3-, NH4+, PO4, and Si from filtered sediment porewaters. Basis for the flux data “F” in Table 1

Beat Müller, Martin Märki, Martin Schmid, Elena Vologina, Bernhard Wehrli, Alfred Wüest & Michael Sturm
Porewater samples were conserved with 0.2% chloroform and analyzed at EAWAG, Switzerland, for NO3-, NH4+, SiO2, and o-PO4 using standard photometric methods (DEW, 1996). In 2002, NH4+ in porewater was measured on board of the research vessel with the indophenol method (DEW, 1996) and a portable photometer (Merck Spectroquant). In March and July 2001, porewater measurements of O2, NO3−, and NH4+ were performed with ion-selective electrodes on retrieved sediment cores from the South Basin, Vydrino,...

Depth profiles of the contribution to total chlorophyll a+chlorophyllide a by Bacillariophyceae plus Chrysophyceae (BacChrys), Chlorophyta (Chloro), and cyanobacterial picoplankton (Cyano).

Susanne Fietz, Michael Sturm & Andreas Nicklisch
Calculations were based on factors established for 89 water samples across Lake Baikal in July 2001 (see text). The traps were deployed for about 16 months and the core top spanned c. 7 years (see text).According to the contribution to the chlorophyll a-model shown in Eq. (1), the chlorophyll a content in the water of the south basin in July 2001 was composed of 30% Bacillariophyceae plus Chrysophyceae, 44% Chlorophyta, and 26% cyanobacterial picoplankton. In...

Depth profiles of chlorophyll a/carbon ratio (Chla/C), chlorophyllide a/carbon ratio (Chlida/C), pheophorbide a/carbon ratio (Phbida/C), pheophytin a/carbon ratio (Pha/C), and pyropheophytin a/carbon ratio (PyroPha/C).

Susanne Fietz, Michael Sturm & Andreas Nicklisch
Fig. 4 visualises differences in the degradation between the organic compounds, chlorophylls, and carbon. The chlorophyll a/carbon ratio decreased with depth, indicating that organic carbon is more slowly degraded than chlorophyll a (Table 6 and Fig. 4), whereas the pheophytin a/carbon ratio and the pyropheophytin a/carbon ratio increased with the depth, indicating the formation of pheophytin and pyropheophytin with depth (Table 6 and Fig. 4). Best fits for the chlorophyllide a/carbon ratio and pheophorbide a/carbon...

Depth profiles of marker pigments from Bacillariophyceae plus Chrysophyceae (A), Chlorophyta (B), cyanobacterial picoplankton (C), Eustigmatophyceae, and Cryptophyta (D).

Susanne Fietz, Michael Sturm & Andreas Nicklisch
The traps were deployed for about 16 months. The respective regression equations and its coefficients of determination (r2) are reported in Table 5.In the 40-m trap, fucoxanthin was the dominant carotenoid (Table 1 and Fig. 3). Other pigments of Bacillariophyceae plus Chrysophyceae (chlorophyll c, diadinoxanthin, and diatoxanthin) as well as the cyanobacterial zeaxanthin also showed high sedimentation rates, whereas the chlorophyte chlorophyll b and lutein, as well as the cryptophyte alloxanthin, sedimented only in low...

Vertical profiles of settling particles in the water column.

Susanne Fietz, Michael Sturm & Andreas Nicklisch
During 16 months of deployment, 239 g m−2 dry matter settled in the 40-m trap, with an average flux of 14.9 g m−2 month−1 (Table 2 and Fig. 2). The content of organic carbon was 21.9% at that depth and that of total nitrogen 1.6% (Table 2 and Fig. 2). The resulting atomic C/N ratio of 15 indicated that the sedimented material resulted from the autochthonous production by suspended phytoplankton and that terrigenous input is...

Selected electron-microprobe analyses of vivianite and santabarbaraite from Lake Baikal

Natalie Fagel, Laurent Alleman, L Granina, F Hatert, Edit Thamo-Boszo, R Cloots & Luc André
Electron-microprobe analyses (Table 5) were completed on a selection of grains from 11 samples, with a CAMECA SX-50 instrument (University of Louvain-la-Neuve, Belgium), under an accelerating voltage of 15 kV and a probe current of 20 nA. The standards used were the Kabira graftonite (Fe, Mn, P; Fransolet, 1975), corundum (Al), olivine (Mg), wollastonite (Si), and willemite (Zn).

Unit-cell parameters and Mn(Fe+Mn) ratios of vivianites from Lake Baikal

Natalie Fagel, Laurent Alleman, L Granina, F Hatert, Edit Thamo-Boszo, R Cloots & Luc André
The unit-cell parameters (Table 4) were calculated with the least-squares refinement program LCLSQ 8.4 (Burnham, 1991), from the d-spacings corrected with an internal standard of Pb(NO3)2.

Trace element composition of concretions, ICP–MS measurements

Natalie Fagel, Laurent Alleman, L Granina, F Hatert, Edit Thamo-Boszo, R Cloots & Luc André
In order to get a complete geochemical signature, 14 P-rich concretions, chosen among the different cores, were acid digested (Table 3a and Table 3b). In a clean laboratory, 1.7 to 36 mg of concretions were digested overnight in a concentrated mixture of Suprapur acid (3 ml HCl/2 ml HNO3/1 ml HF) at 90 °C in sealed Teflon beakers. After evaporation to dryness, the residue was dissolved in 2.5 ml of 2% HNO3 Suprapur and diluted...

Registration Year

  • 2006
    75

Resource Types

  • Dataset
    74

Data Centers

  • Geoforschungszentrum Potsdam
    75