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  • 1
    Book
    Book
    Initial core descriptions / Deep Sea Drilling Project : Leg 86, Western North Pacific, 2 May - 20 June, 1982 (1982)
    La Jolla, Calif. : Univ. of California, SCRIPPS Inst. of Oceanography
    Details Availability
    Type of Medium: Book
    Pages: 112 S
    Language: Undetermined
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  • 2
    Electronic Resource
    Electronic Resource
    Authigenic magnetite formation in suboxic marine sediments (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 490-493 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Early diagenesis of iron in sediments occurs as a part of the progressive oxidation of organic matter through a sequence of microbially mediated metabolic reactions proceeding from O2, NO3, Mn, Fe and SO4 reduction to fermentation and CH4 production1'4. Suboxic marine sediments commonly show a near ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326490a0
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Lag times for oceanic responses to climatic change (1975)
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 716-717 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Few of the studies have attempted to establish whether the various changes are synchronous, or whether there are leads and lags in the system7. Such information is critical in evaluating theories and models of climatic change, and in sorting out causes from effects. Thus, if bottom water changes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/256716a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Tectonics of the Mid-Atlantic Ridge, 6–8° South latitude (1970)
    Springer
    Marine geophysical researches 1 (1970), S. 5-36 
    Details
    ISSN: 1573-0581
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A regional geophysical traverse of the Mid-Atlantic Ridge in the northern South Atlantic was obtained during CIRCE cruise of the Scripps Institution of Oceanography. During the traverse, four detailed surveys were made of small areas on the crest and east flank. The geomagnetic anomaly profile can be used as a time base for the interpretation of tectonic events of the ridge. The profile also suggests that the rate of sea-floor spreading in this part of the South Atlantic accelerated twice, approximately 40 and 4.5 million years ago, and decelerated at least twice, 38 and 10 million years ago. Accelerations were probably accompanied by uplift and normal faulting of the central part of the ridge, while decelerations produced subsidence with modest contraction, reflected in reverse faulting and folding. The effects of uplift are clearly present in the reflection seismic records, which are, however, not well suited to detect reverse faulting. Spreading without creation of significant relief occurred on the ridge until approximately 5 million years ago. This process produced a low relief with small rifts, strongly reminiscent of the present crestal topography of the East Pacific Rise. A markedly linear secondary relief of 100–200 m, parallel to the ridge axis, developed later by faulting of the flanks. Portions of the crust that were near the crest during periods of uplift are more intensely faulted than those that were remote at all times. The importance of the last uplift of the crest and associated faulting on the flanks is reflected by a decrease in the density of faulting away from the ridge crest. The present crestal zone is very different from the flanks and from the older crests; the relief is nearly ten times greater, transverse disturbances are common, and there is conflicting evidence regarding its age. This striking change in character indicates either a recent change in the spreading process or a recent period of strong deformation which has affected only the crestal zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310007
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    Paper (German National Licenses)
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  • 5
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    Sedimentation at Manop Site H in the eastern equatorial Pacific
    PANGAEA
    In:  Supplement to: Finney, Bruce P; Lyle, Mitchell W; Heath, G Ross (1988): Sedimentation at Manop site H (eastern equatorial Pacific) over the past 400,000 years: climatically induced redox variations and their effects on transition metal cycling. Paleoceanography, 3(2), 169-189, https://doi.org/10.1029/PA003i002p00169
    Details
    Publication Date: 2023-05-12
    Description: Gravity cores recovered from Manganese Nodule Project site H (6°33'N, 92°49'W) show marked downcore variations in the abundance of calcium carbonate, organic carbon, opal, manganese, and other components deposited over the past 400,000 years. Variations in the downcore abundance of organic carbon, which ranges from 0.2 to 1.0%, can be used to hindcast redox conditions in the surface sediments over this time. The results indicate that the depth to the manganese redox boundary varied from about 5 to 25 cm below the seafloor during four major cycles. Downcore variations in solid phase Mn, Ni, and Cu can be produced by such changes in redox conditions. A model which predicts that solid phase Mn can be trapped and buried when the Mn redox boundary migrates rapidly upward is consistent with the observed organic carbon and Mn records and supports the reconstructed redox variations. The history of redox variations at site H can be explained by changes with time in surface water productivity. Major productivity variations at the site occur over 100-kyr cycles, with relatively higher productivity occurring during glacial stages. Thus Quaternary climate changes influence surface water productivity, redox conditions in sediments, and the cycling of transition metals.
    Keywords: GC; Gravity corer; MANOP; Pacific Ocean; Silicon Cycling in the World Ocean; SINOPS; VULCAN-1-38GC; VULCAN-1-49GC; VULCAN-1-70GC
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    Paleomagnetism at DSDP Sites 86-576 and 86-578
    PANGAEA
    In:  Supplement to: Heath, G Ross; Rea, David K; Levi, Shaul (1985): Paleomagnetism and accumulation rates of sediments at Sites 576 and 578, Deep Sea Drilling Project Leg 86, western North Pacific. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 459-502, https://doi.org/10.2973/dsdp.proc.86.118.1985
    Details
    Publication Date: 2023-05-12
    Description: The upper sections of Deep Sea Drilling Project Sites 576 (32°21.4'N, 164°16.5'E) and 578 (33°55.6'N, 151°37.7'E) both have stable detrital remanence that can be correlated with the standard reversal stratigraphy. Site 576 contains all reversals above the base of the Gilbert Epoch (5 m.y.) at about 25 m, whereas Site 578 contains a remarkable section of about 60 reversals extending to Anomaly 5B (15 m.y.) at about 150 m sub-bottom depth. In both cases, the paleomagnetic stratigraphy breaks down when accumulation rates drop below 2 m/m.y. At both sites, authigenic manganiferous clays deposited from 70 to 16 m.y. ago accumulated at about 0.4 m/m.y. Similarly, at both sites, the Pleistocene pulse of eolian debris increased accumulation rates by about 6 m/m.y.**2. From 16 to 2 m.y. ago, however, sediment accumulated at Site 578 about five times as rapidly as at Site 576, apparently because of augmented input to the western site by bottom currents.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 8 datasets
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    DATA PANGAEA
  • 7
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    Elemental abundance and water content at DSDP Leg 86 Holes
    PANGAEA
    In:  Supplement to: Heath, G Ross; Kovar, Richard B; Lopez, Carlos; Campi, Gregory L (1985): Elemental composition of Cenozoic pelagic clays from Deep Sea Drilling Project Sites 576 and 578, western North Pacific. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 605-646, https://doi.org/10.2973/dsdp.proc.86.127.1985
    Details
    Publication Date: 2023-05-12
    Description: X-ray fluorescence analyses of 1143 samples from Site 576 (32°21.4'N, 164°16.5'E) and 539 samples from Site 578 (33°55.6'N, 151°37.7'E) for the elements Na, Mg, Al, Si, P, K, Ca, Ti, Mn, Fe, Ba, and S show consistent trends from Si-rich surficial deposits to dark brown clays rich in Mn, Fe, P, and Ti in early Cenozoic sections. These data sets form the basis for a detailed paleogeochemical stratigraphy of North Pacific "red" clays.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 8
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    Geochemistry of sediments at DSDP Sites 579, 580, and 581
    PANGAEA
    In:  Supplement to: Heath, G Ross; Kovar, Richard B; Lopez, Carlos (1985): Geochemistry of sediments at Sites 579, 580, and 581, Deep Sea Drilling Project Leg 86, western North Pacific. In: Heath, GR; Burckle, LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Government Print Office), 86, 657-670, https://doi.org/10.2973/dsdp.proc.86.129.1985
    Details
    Publication Date: 2023-05-12
    Description: The elemental composition of sediments from Sites 579 (38°38'N, 153°50'E) and 580 (41°37'N, 153°59'E) is dominated by contributions from terrigenous detritus (including numerous thin ash beds) and opal-rich biogenic debris, with the terrigenous component increasing in dominance in the youngest sediments as the flux of Pleistocene eolian debris associated with Northern Hemisphere glaciation has increased. Diagenesis related to redox-sensitive reactions in near-surface sediments has had a marked impact on the distributions of Mn and S. At Site 581 (43°56'N, 159°48'E), the reduced biosiliceous clays corresponding to the sections at Sites 579 and 580 are underlain by a normal oxidized North Pacific "red clay" sequence. As at other North Pacific sites, the concentrations of Mn and Fe (as oxyhydroxides), Ba (as barite), and P (as fish debris) vary inversely with the accumulation rates of the clays. The cherts underlying the clays at Site 581 are noteworthy for their high P contents (comparable to values for biosiliceous clays) and high Fe and Mn relative to Ti and Al, suggestive of derivation from well-oxidized pelagic sediments.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 9
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    (Table 1) TOC, CaCO3, opal, age model and metal element abundance of Site VULCAN-1-38GC
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age model; Aluminium; Calcium carbonate; Calculated; Carbon, organic, total; Copper; DEPTH, sediment/rock; Element analyser CHN, LECO; GC; Gravity corer; Iron; Manganese; MANOP; Nickel; Opal, biogenic silica; Opal, normative calculation; Leinen, 1977; Pacific Ocean; Silicon; Silicon Cycling in the World Ocean; SINOPS; Tephra/volcanic ash; Titanium; VULCAN-1-38GC; X-ray fluorescence (XRF); Zinc
    Type: Dataset
    Format: text/tab-separated-values, 416 data points
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    DATA PANGAEA
  • 10
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    (Table 1) TOC, CaCO3, opal, age model and metal element abundance of Site VULCAN-1-70GC
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age model; Aluminium; Calcium carbonate; Calculated; Carbon, organic, total; Copper; DEPTH, sediment/rock; Element analyser CHN, LECO; GC; Gravity corer; Iron; Manganese; MANOP; Nickel; Opal, biogenic silica; Opal, normative calculation; Leinen, 1977; Pacific Ocean; Silicon; Silicon Cycling in the World Ocean; SINOPS; Tephra/volcanic ash; Titanium; VULCAN-1-70GC; X-ray fluorescence (XRF); Zinc
    Type: Dataset
    Format: text/tab-separated-values, 429 data points
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    DATA PANGAEA
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