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  • 1985-1989  (19)
  • 1970-1974  (14)
Publikationsart
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Verlag/Herausgeber
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    ARAGONITIC OOIDS: EXPERIMENTAL PRECIPITATION FROM SEAWATER IN THE PRESENCE OF HUMIC ACID. (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 19 (1972), S. 0 
    Details
    ISSN: 1365-3091
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Humic acid dissolved in artificial seawater influenced the morphology, internal structure, and composition of aragonite when precipitation was induced with dilute Na2CO3 solution. At sodium humate concentrations of around 20 mg/1, numerous brownish spherical aragonite bodies developed within one day at 25 °C. The spheres ranged in size from 10–100 microns and resembled natural marine ooids. They formed with gentle agitation of the solution as well as with no water movement at all. The typical structure of natural ooids consisting of concentric alternating aragonite and organic laminae was experimentally duplicated as layers of aragonite crystals alternating with humate membranes; however, in contrast to natural ooids, the individual aragonite crystals here were oriented radially with their c-axes. The aragonite of the spheres contained about 20 wt. % more strontium than the aragonite precipitated experimentally without the addition of sodium humate, and organic carbon content of the spherical aragonite was about 7% by weight.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3091.1972.tb00240.x
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  • 2
    Digitale Medien
    Digitale Medien
    Palaeoceanography: Biomarkers for ancient climates (1986)
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 107-108 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] ENVIRONMENTAL conditions of growth, particularly ocean temperature, are faith-fully recorded by the coccolithophorids - widely distributed marine phytoplankton. The record lies in the relative abundance of long-chain alkenones - complex orga-nic molecules of the lipid bilayer which control the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/320107a0
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of microbe activity (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 17-18 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] ORGANIC matter exists in many forms in the oceans - as detritus and microbes, which can be suspended or sinking, and also as dissolved organic matter. The way these pools interact is influenced by, and influences, the distribution of nutrients and oxygen dissolved in the water column. One point of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/333017a0
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  • 4
    facet.materialart.
    Unbekannt
    3He in the Bransfield Strait waters: indication for local injection from back-arc rifting (1988)
    Pergamon Press
    In:  Deep Sea Research Part A: Oceanographic Research Papers, 35 (12). pp. 1919-1935.
    Details
    Publikationsdatum: 2020-08-04
    Beschreibung: Helium data from the waters of the Bransfield Strait, the southern Drake Passage and the northwestern shelf of the Weddell Sea are presented. The 3He profiles from the eastern and central basins of the Bransfield Strait show maxima (δ3He ≈ 7%) below the sill depths that separate the strait from the surrounding open ocean. The 3He excess is interpreted as a local injection of a 3He-rich helium component into the deep waters of the Bransfield Strait from backarc rifting. Tritiogenic 3He and excess 3He from mixing with Circumpolar Deep Water are excluded as possible sources. The estimated 3He/4He ratio of the injected helium component (2.4–5.0 × 10−6) is less than that of pure mantle helium and may contain radiogenic helium from continental crustal material which underlies the Bransfield Strait.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0198-0149(88)90117-3
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  • 5
    facet.materialart.
    Unbekannt
    Mg-NH4 exchange on humic acid: A radiotracer technique for conditional exchange constants in a seawater medium (1988)
    Elsevier
    In:  Chemical Geology, 70 (4). pp. 349-357.
    Details
    Publikationsdatum: 2016-07-19
    Beschreibung: A radiotracer technique, employing 27Mg, is used to determine the Mg released by ammonium exchange on undis-solved humic acid in a seawater medium. This new method allows for the measurement of exchangeable Mg on the solid phase surface, which eliminates the problem caused by the high-Mg background in the seawater matrix. The precision calculated from the counting statistics is better than ±2%; the reproducibility among repeated counts ranged from ±1% to ±3%. The higher sensitivity of the method allows for monitoring the MgNH4 exchange at concentrations as low as 30 mM NH4. This is a major improvement relative to the data obtained with the analytical methods used so far, which allow detection of exchangeable Mg only at NH4 concentrations higher than 1 M. The lower experimental concentrations are more in accordance with the natural ammonium levels found in anoxic marine sediments. For the undissolved humic acid used in this experiment, the amount of exchangeable Mg in apparent equilibrium with an ammonium-free seawater matrix was found to be 96.6 ± 0.4 meq/100g. The Mg-NH4 exchange on humic acid in seawater comes to a steady-state value in 〈 18 min. The conditional equilibrium constant obtained for this reaction, Kcond = 0.039 ± 0.001 M−1. The technique can be expanded to other geochemical solid phases in seawater and it can be modified to study the behavior of the major cations by using 24Na, 42K and 49Ca.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0009-2541(88)90124-6
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  • 6
    facet.materialart.
    Unbekannt
    Convergent Tectonics and Coastal Upwelling: A History of the Peru Continental Margin (1987)
    International Union of Geological Sciences
    In:  Episodes: Journal of International Geoscience, 10 (2). pp. 87-93.
    Details
    Publikationsdatum: 2016-10-07
    Beschreibung: The geological evolution of the western margin of South America has long been a challenge to geologists interested in convergent plate tectonics. Late in 1986, scientists on the ODP drillship JOIDES Resolution confirmed that the upper slope of the Peruvian margin consists of continental crust whereas the lower slope comprises an accretionary complex. An intricate history of horizontal and vertical movements can be detected, and the locations of ancient centers of upwelling appear to have varied, partly due to tectonic movements of the margin. In this review of Leg 112, the three scientific leaders on this cruise discuss their results.
    Materialart: Article , PeerReviewed
    Format: text
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  • 7
    facet.materialart.
    Unbekannt
    Biological communities at vent sites along the subduction zone off Oregon (1985)
    Biological Society of Washington
    In:  Bulletin of the Biological Society of Washington, 6 . pp. 475-484.
    Details
    Publikationsdatum: 2020-07-16
    Beschreibung: An abundant deep-sea benthic community, dominated by the vestimentiferan tube worm, Lamellibrachia barhami, a giant white clam, Calyptogena sp., and a second clam, Solemya sp., was discovered along the northeast Pacific continental margin during dives of DSRV Alvin off Oregon. The localities are tectonically controlled and occur along submarine ridges that result from sediment deformation and accretion at the leading edge of plate subduction. Ancient sea-water buried with the sediment, dissolved methane and ammonia, and methane-derived carbonate are discharged to the ocean floor along this tectonically active margin. We hypothesize that the unusual benthic community is sustained by a chemosynthetic-energy metabolism based on the oxidation of methane by free living and symbiotic microbial populations. These organisms represent another significant adaptation of deep-sea biota to a site where the abundanc of food (in this case not directly related to particulate input from the sea surface but to tectonically generated methane), allows higher than normal levels of productivity and metabolism, despite the high pressures and low temperature of the deep-sea habitat. It is tempting to relate the global distribution of such faunas to chemosynthetic food sources generated by tectonic forces.
    Materialart: Article , PeerReviewed
    Format: text
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  • 8
    facet.materialart.
    Unbekannt
    Interaction of organic compounds with calcium carbonate-II. Organo-carbonate association in Recent sediments (1973)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 37 (11). pp. 2435-2447.
    Details
    Publikationsdatum: 2016-02-29
    Beschreibung: Surface area measurements as well as organic carbon, nitrogen and phosphorus analyses on various grain size fractions of carbonate mud samples confirm that in natural environments of carbonate deposition, surface sorption processes take place which are similar to those described earlier for dissolved organics and artificially suspended calcite particles in both seawater and synthetic solutions. The specific surface area of the sediment increases from 1.8m2/g for the coarse-grained fraction to 12.5 m2/g for the fine material; likewise organic carbon, nitrogen and phosphorus increase with increasing surface area so that there are 1.20 mg C, 0.175 mg N and 0.06–0.20 mg P associated with every square meter of carbonate surface irrespective of the mineralogy of the sediment particles. It appears that the organic matter in these sediments is similar in composition, structure and quantity to the organic layers produced in sorption experiments. With their apparently defined structure and ubiquitous nature, these layers could determine the mineralogy and orientation of submarine carbonate cement or could even be a prerequisite to calcification in general.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0016-7037(73)90290-1
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  • 9
    facet.materialart.
    Unbekannt
    Effects of microbe activity (1988)
    Nature Publishing Group
    In:  Nature, 333 (6168). pp. 17-18.
    Details
    Publikationsdatum: 2019-05-06
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1038/333017a0
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  • 10
    facet.materialart.
    Unbekannt
    Thermal interaction between back-arc volcanism and basin sediments in the Bransfield Strait, Antarctica (1987)
    National Science Foundation, Division of Polar Programs
    In:  Antarctic Journal of the United States, 22 (5). pp. 47-49.
    Details
    Publikationsdatum: 2016-03-01
    Materialart: Article , PeerReviewed
    Format: text
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