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  • 1
    Electronic Resource
    Electronic Resource
    Rezente marine Eisenerze auf Santorin, Griechenland (1973)
    Springer
    International journal of earth sciences 62 (1973), S. 786-812 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Recent iron sediments forming at present in a bay of the volcanic island Palaea Kameni within the caldera of Santorini, Aegean Sea, have been investigated for their mineralogy and geochemistry. For the first time siderite has been found in a marine environment to be major constituent of a recent sediment. Further main constituents are opal, ferric hydroxide, vivianite, ferrous hydroxide, and possibly ferrous silicate. The chemical composition both of the solid material of the sediment cores and of their pore solution indicate that the ore forming solutions have originated from the leaching of volcanic kalk-alcaline rocks by hot acid solutions. This is in agreement with experimental leaching of these rock types. No enrichment of lead, copper, zinc etc. was found in the sediments. Iron oxidizing bacteria in the reddish-brown ferric hydroxide sediments now forming in bays of the Kameni Islands have been studied by light and electron microscopic investigations. Samples from the uppermost parts of the sediment consist mainly of the ferric hydroxide stalks of the iron bacteriumGallionella ferruginea. The stalks showing their morphological characteristics occur in such masses that there is no doubt concerning the presence, activity and share of these bacteria in the process of iron sedimentation. Phases of sedimentation process and kinetics of ferric hydroxide stalk formation have been determined qualitatively and quantitatively by in-situ-experiments using artificial growing surfaces (underwater “Aufwuchs” on glass slides). The results obtained are compared to similar iron sedimentation in fresh water habitats and iron rich carbonate springs discussed in literature in connection with the problem of submarine exhalative sedimentary iron ore formation.
    Abstract: Résumé Les sédiments de fer qui se sont récemment formés dans une baie de la jeuneîle volcanique Palaea Kameni qui se trouve à l'intérieur de la caldera du Santorin (Thira) (Mer Egée) ont fait l'objet d'examens minéralogiques et géochimiques. Pour la première fois, on a pu prouver que la sidérite est un constituant principal d'un sédiment récent en milieu marin. D'autres constituants principaux sont l'opale, l'hydroxyde de fer (III), la vivianite, l'hydroxyde de fer (II), ou le silicate. En conformité avec les recherches expérimentales, la composition chimique des matériaux solides et de leur eau interstitielle dans les carottes sédimentaires indique que les solutions minéralisantes proviennent du lessivage des roches volcaniques calco-alcalines par des solutions chaudes et acides. On n'a pas trouvé d'enrichissement en plomb, cuivre, zinc, etc. dans ces sédiments. Des sédiments rouge-brun formés par voie sous-marine à la surface des sédiments, provenant de baies de Kameni, ont été analysés quant à leur teneur en bactéries de fer au moyen de microscopes photoélectriques et électroniques. Ils consistent essentiellement en rubans d'hydroxyde de fer (III) précipités par la bactérieGallionella ferruginea. Au cours de recherches in situ faites au moyen de porte-objets déposés sous la mer, on a déterminé quantitativement et qualitativement la sédimentation de fer causée par cette bactérie dans une baie de Palaea Kameni, et on a suivi tout le processus de la sédimentation d'hydroxyde de fer (III) dans ses phases temporelles et structurelles. La bactériogenèse prouvée des sédiments marins récents d'hydroxyde de fer a été mise en liaison avec les processus de sédimentation du fer correspondants se déroulant dans les biotopes limniques et les sources d'eau ferrugineuses, acides, tels qu'on les trouve dans la littérature pour expliquer la genèse des gisements de minerais de fer marins-sédimentaires (minerais de Lahn-Dill).
    Notes: Zusammenfassung Rezente Eisensedimente, die sich in einer Bucht der jungen Vulkaninsel Palaea Kameni innerhalb der Kaldera von Santorin, Ägäis, bilden, wurden hinsichtlich Mineralogie und Geochemie untersucht. Erstmalig konnte Siderit in einem marinen Milieu als Hauptbestandteil eines rezenten Sedimentes nachgewiesen werden. Sonstige Hauptbestandteile sind Opal, Eisen-III-hydroxid, Vivianit, Eisen-II-hydroxid bzw. Silikat. Die Chemie des Kernmaterials und seines Porenwassers deutet in Übereinstimmung mit experimentellen Untersuchungen auf eine Herkunft der erzabscheidenden Lösungen aus Auslaugungen vulkanischer Kalkalkaligesteine durch saure heiße Lösungen hin. Anreicherungen von Buntmetallen treten in diesen Sedimenten nicht auf. An der Sedimentoberfläche submarin gebildete rotbraune Sedimente aus Palaea-Kameni-Buchten wurden licht- und elektronenmikroskopisch auf ihren Gehalt an Eisenbakterien untersucht. Sie bestehen zum wesentlichen Teil aus den ausgeschiedenen Eisen-III-hydroxid-Bändern des EisenbakteriumsGallionella ferruginea. Mit in-situ-Untersuchungen auf submarin exponierten Objektträgern wurde die von diesem Bakterium verursachte Eisensedimentation in einer Bucht von Palaea Kameni qualitativ und quantitativ bestimmt und der gesamte Eisen-III-hydroxid-Sedimentationsvorgang zeitlich und strukturell in einzelnen Phasen verfolgt. Die nachgewiesene Bakterogenese der rezenten submarinen Eisenhydroxidsedimente wurde zu entsprechenden in limnischen Biotopen und Eisensäuerlingen ablaufenden Eisensedimentationsvorgängen in Beziehung gesetzt, die in der Literatur zur Klärung der Genese marin-sedimentärer Eisenerzlagerstätten (Lahn-Dill-Erze) herangezogen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01820961
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  • 2
    Electronic Resource
    Electronic Resource
    Bestimmung sehr kleiner Verteilungskoeffizienten von Cs, Na und Ba zwischen Lösung und KCl-Einkristallen mit Hilfe radioaktiver Isotope (1966)
    Springer
    Contributions to mineralogy and petrology 13 (1966), S. 161-180 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Distribution of Cs, Na, and Ba between great monocrystals of KCl and water solution was investigated. Impurity was either labelled by long-lived radioactive isotopes or was activated after growth of the crystals by neutrons in a nuclear reactor. No influence on partition coefficients was caused by using radioactive tracers, e.g. due to raised inclusion of mother liquor. Between impurity concentrations from 3·10−4 to 10−1 in the solution the partition coefficients were nearly constant and about 10−3 for Na, about 10−4 for Cs, and 〈5·10−5 for Ba in KCl at temperatures of 40° C. If different impurity ions were built in simultaneously, the partition coefficients were independent of composition of solution. In case of Cs in KCl capture of Cs increased with increasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00518024
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  • 3
    Electronic Resource
    Electronic Resource
    Instrumentelle Neutronenaktivierungsanalyse von Gesteinen am Beispiel von 7 Standardgesteinen des US Geological Survey (1973)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 263 (1973), S. 100-107 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von Gesteinen ; Aktivierungsanalyse, Neutronen ; US-Standardgesteine als Multielementstandards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe instrumenteller Neutronenaktivierungsanalyse wurden in den Standardgesteinen G-2, GSP-1, AGV-1, PCC-1, DTS-1, BCR-1 und W-1 des US Geological Survey die Elemente Sc, Cr, Co, Rb, Sb, Cs, La, Ce, Nd, Eu, Tb, Yb, Lu, Hf, Ta und Th bestimmt und mit den Ergebnissen anderer Autoren verglichen. Die Gesteinsstandards sind bezüglich ihrer Spurenelementverteilung hinreichend homogen, um bei der Analyse von geologischem Material in den meisten Fällen als Multielementstandards verwendet werden zu können.
    Notes: Abstract By means of instrumental neutron-activation analysis the elements Sc, Cr, Co, Rb, Sb, Cs, La, Ce, Nd, Eu, Tb, Yb, Lu, Hf, Ta, and Th were determined in the standard rocks G-2, GSP-1, AGV-1, PCC-1, DTS-1, BCR-1, and W-1 of the US Geological Survey. The results were compared with those of other authors. These standard rocks are sufficiently homogeneous, as regards their trace element distribution, to be used as multielement standards in most analyses of geological material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424351
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  • 4
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    Instrumentelle Neutronenaktivierungsanalyse von Gesteinen am Beispiel von 7 Standardgesteinen des US Geological Survey (1973)
    Springer
    Details
    Publication Date: 1973-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 5
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    Distribution of rare-earth and other trace elements in magnetites (1979)
    Elsevier
    Details
    Publication Date: 1979-07-01
    Print ISSN: 0009-2541
    Electronic ISSN: 1872-6836
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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  • 6
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    Bestimmung sehr kleiner Verteilungskoeffizienten von Cs, Na und Ba zwischen L�sung und KCl-Einkristallen mit Hilfe radioaktiver Isotope (1966)
    Springer
    Details
    Publication Date: 1966-01-01
    Print ISSN: 0010-7999
    Electronic ISSN: 1432-0967
    Topics: Geosciences
    Published by Springer
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  • 7
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    Rezente marine Eisenerze auf Santorin, Griechenland (1973)
    Springer
    Details
    Publication Date: 1973-11-01
    Print ISSN: 0016-7835
    Electronic ISSN: 1432-1149
    Topics: Geosciences
    Published by Springer
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  • 8
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    Chemical composition of ocean-floor basalts and separated magnetites DSDP Legs 37, 45 and 46
    PANGAEA
    In:  Supplement to: Schock, Hans Hartmut (1979): Distribution of rare-earth and other trace elements in magnetites. Chemical Geology, 26(1-2), 119-133, https://doi.org/10.1016/0009-2541(79)90034-2
    Details
    Publication Date: 2023-06-27
    Description: Titanomagnetites separated from 15 different rock samples (including ocean-floor basalts from DSDP Legs 37, 45 and 46) were analyzed together with whole-rock samples by instrumental neutron-activation analysis for Sc, Cr, Co, Zn, Hf, Ta, Th and the REE La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb and Lu. In titanomagnetities from ocean-floor basalts and some other rocks, REE are enriched with respect to the whole-rock composition by factors of between 1.5 and 3 for light REE and between 1.0 and 1.9 for heavy REE; that is, REE with larger ionic radii are preferentially incorporated into the magnetite lattice. Three magnetite samples are REE depleted. Their whole-rock samples contain P in appreciable amounts, so apatite, an important REE-accumulating mineral, could have captured REE to some extent. All titanomagnetites show a marked negative Eu anomaly, this is most probably caused by discrimination of Eu(2+) from the magnetite lattice. Co, Zn, Hf and Ta are significantly enriched in magnetites. The distribution behaviour of Sc and Cr is masked chiefly by the crystallization of clinopyroxene and therefore is not easy to estimate. Ulvöspinel contents of about 70% for the titanomagnetites from ocean-floor basalts were estimated from qualitative microprobe analysis. Ulvöspinel contents of all other samples varied in a wide range from 20% to about 90%. No correlation could be observed between this and the REE contents of the magnetites. Ilmenite exsolution lamellae could only be observed in titanomagnetites from a doleritic basalt from Leg 45.
    Keywords: 37-332A; 37-332B; 45-395A; 46-396B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg37; Leg45; Leg46; North Atlantic/VALLEY
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 9
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    Elemental concentrations in ocean-floor basalts and separated magnetites at DSDP Site 37-332A (1979)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 37-332A; Calculated; Cerium; Chromium; Cobalt; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Europium; Gadolinium; Glomar Challenger; Hafnium; Instrumental neutron activation analysis (INAA); Iron; Lanthanum; Leg37; Lutetium; Neodymium; North Atlantic/VALLEY; Probe Type; Rock type; Samarium; Sample code/label; Scandium; Tantalum; Terbium; Thorium; Thulium; Titanium; Ytterbium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
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  • 10
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    Elemental concentrations in ocean-floor basalts and separated magnetites at DSDP Site 46-396B (1979)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 46-396B; Cerium; Chromium; Cobalt; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Europium; Gadolinium; Glomar Challenger; Hafnium; Instrumental neutron activation analysis (INAA); Iron; Lanthanum; Leg46; Lutetium; Neodymium; Probe Type; Rock type; Samarium; Sample code/label; Scandium; Tantalum; Terbium; Thulium; Titanium; Ytterbium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 43 data points
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