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  • 1
    Digitale Medien
    Digitale Medien
    Downslope transport of metalliferous sediments along the East Pacific Rise during the late Miocene (1985)
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 807-809 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Hole 599 (1927.09'S, 11952.88' W; water depth = 3,654m), located 600 km west of the present ridge crest, was drilled in a small basin surrounded by a region of low relief with abyssal hills ranging from 200 to 300m in height (Fig. 1). This site yielded some 41 m of mostly Upper Miocene ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/316807a0
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  • 2
    Digitale Medien
    Digitale Medien
    A direct link between the China loess and marine δ 18 O records: aeolian flux to the north Pacific (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 296-298 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The advantage of using oceanic sediments to infer palaeocli-matic conditions of eastern Asia is the reliability and uniformity of the dating techniques for marine sediments. Late Pleistocene variations in 518O values in the CaCO3 of benthic foraminifera shells reflect the changing oxygen-isotope ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/340296a0
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  • 3
    Digitale Medien
    Digitale Medien
    Neogene history of the calcite compensation depth and lysocline in the South Pacific Ocean (1985)
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 805-807 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Early workers in marine geology realized that throughout most of the deep ocean the calcium carbonate microfossil tests generated in surface waters dissolved before they could be incorporated into the sediments1. Experiments in the Pacific by Peterson2 and Berger3'4 showed that calcite dissolution ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/316805a0
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  • 4
    Digitale Medien
    Digitale Medien
    Possible methane-induced polar warming in the early Eocene (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 320-322 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Methane is produced primarily by anaerobic bacteria. Major sources of methane are swamps and wetlands, rice paddies, termites and enteric fermentation by ruminants15"17. For the early Eocene, anthropogenic and ruminant contributions of methane can be discounted, increasing relative ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/357320a0
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  • 5
    Digitale Medien
    Digitale Medien
    Short-wavelength magnetic anomalies in a region of rapid seafloor spreading (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 126-128 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Our data consist of 14 profiles from a survey of the East Pacific Rise (EPR) crest, centred at 20S (Fig. 1), where the total spreading rate is about 161 mm yr'1. This survey was completed in the spring of 1973 by the NO A A ship Oceanographer. Navigation was entirely by satellite. Total-field ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/255126a0
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  • 6
    Digitale Medien
    Digitale Medien
    Composition and distribution of suspended sediments in Lake Michigan during summer stratification (1982)
    Springer
    Environmental geology 4 (1982), S. 87-98 
    Details
    ISSN: 1432-0495
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract A quantitative description of the composition and distribution of suspended sediments is a necessary prerequisite to the determination of the transport and fate of those particles and of the chemical substances associated with them. This report is the first to make such a description for materials in the Great Lakes. Suspended sediment samples were collected from Lake Michigan during August from several depths at six locations between Grand Haven, Michigan, and Milwaukee, Wisconsin. Concentrations of total suspended material range from 1.05–2.40 mg/l. Diatoms comprise nearly all of the biogenic fraction and approximately 60% of the total. Quartz plus feldspar (25%) is usually more abundant than carbonate minerals (13%), and clays are a minor component. Abundances of all constituents were higher near the shore where shoreline input provides both nutrients and minerals. Suspended materials were concentrated at the base of the thermocline and in a bottom nepheloid layer of resuspended sediment. Mineral ratios in the nepheloid layer were similar to those in the surface centimeter of bottom sediment but diatom abundance decreased markedly below the sediment-water interface. The residence time of suspended inorganic materials in Lake Michigan is about 1.8 yrs, ample time for suspended sediment grains to be distributed throughout the lake.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02415763
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  • 7
    Digitale Medien
    Digitale Medien
    Radiocarbon ages of pre-bomb clams and the hard-water effect in Lakes Michigan and Huron (1995)
    Springer
    Journal of paleolimnology 14 (1995), S. 89-91 
    Details
    ISSN: 1573-0417
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract Five radiocarbon ages, all determined by accelerator mass spectrometry, have been obtained for two pre-bomb bivalves from Lake Michigan and one from Lake Huron. After correcting those ages for the fractionation of14C in calcite and for the radioactively inert CO2 in the atmosphere, we find residual ages, caused by the hard water effect, of about 250 years for Lake Michigan and 440 years for Lake Huron.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00682596
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  • 8
    Digitale Medien
    Digitale Medien
    Regional variation in modern radiocarbon ages and the hard-water effects in Lakes Michigan and Huron (1998)
    Springer
    Journal of paleolimnology 20 (1998), S. 347-351 
    Details
    ISSN: 1573-0417
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract Eight new radiocarbon ages, all determined by accelerator mass spectrometry, on modern (pre-bomb) mollusks have been added to similar data provided from three samples in the Lake Michigan and Huron basins. These data confirm the existence of a substantial hard water effect correction ranging from about 250 years to 500 years in these lakes. They also show that the magnitude of these corrections form a spatially coherent pattern that can be related to the pattern of outcrop of Paleozoic (radioactively inert) carbonates that surround the basins and the pattern of circulation within the basins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007920723163
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  • 9
    Digitale Medien
    Digitale Medien
    Book reviews (1996)
    Springer
    Journal of paleolimnology 15 (1996), S. 289-295 
    Details
    ISSN: 1573-0417
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00213050
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  • 10
    Digitale Medien
    Digitale Medien
    Analysis of a fast-spreading rise crest: The East Pacific Rise, 9° to 12° south (1976)
    Springer
    Marine geophysical researches 2 (1976), S. 291-313 
    Details
    ISSN: 1573-0581
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The axis of the East Pacific Rise is defined by a topographic block about 15 km wide and 300 to 350 m high which is flanked by abyssal hills 100 to 200 m high and 3 to 5 km wide. These hills often are tilted such that their steep slopes face the axis. An empirical model explaining these features combines axial extrusion to form the central block and rotational faulting to lower the shoulders of the axial block to the regional depth and tilt them outward. The axial block is offset about 10 km left-laterally at 10.0°S and a similar amount right-laterally at 11.5°S. Offsets (or lack of offsets) of young magnetic anomalies indicate that these axial displacements occurred between 1.7 and 0.9 m.y. ago and 0.7 m.y. ago and the present in the north and south. respectively. These small axial offsets are interpreted to be the result of either brief episodes of asymmetric see-floor spreading or discrete jumps in the site of spreading activity. Both axial shifts were to the west; a unidirectional sequence of such shifts occurring at the above rate of one per million years would be difficult to differentiate from true regional asymmetric spreading and might explain that phenomenon on other medium-to fast-spreading rises. Reconnaissance data from the east flank of the East Pacific Rise indicate that spreading activity began on that part of the rise between the 9°S and 13.5°S fracture zones approximately 8.2 m.y. ago when the site of crustal accretion jumped westward from the now dormant Galapagos Rise. Slope change in crust approximately 2 and 6 m.y. old imply faster spreading rates between about 6 and 2 m.y. ago than either before or after that time. Identification and correlation of anomaly 3′ allows an estimate of about 90 mm/y for this higher east flank spreading rate. Since 1.7 m.y. ago spreading rates have averaged about 80 mm/y to the west and 77 mm/y to the east.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00426250
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