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  • 1
    Description / Table of Contents: The pyroxene and amphibole mineral groups have been the focal points of numerous experimental, theoretical, and field-oriented studies in recent years. Many exciting new results have been obtained since the 1966 International Mineralogical Association Symposium on Pyroxenes and Amphiboles held at the University of Cambridge, England. During September 7-11, 1969, another pyroxene-amphibole symposium will be held at the Virginia Polytechnic Institute, Blacksburg, Virginia. Pyroxenes and Amphiboles: Crystal Chemistry and Phase Petrology is published to coincide with this symposium and is intended to make generally available some of the current research in this field. Formal papers given at the symposium will include new research results not currently at the manuscript stage, and abstracts for these papers will be published in the January-February, 1970, issue of The American Mineralogist.
    Pages: Online-Ressource (VIII, 332 Seiten)
    Language: English
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  • 2
    Description / Table of Contents: The Mineralogical Society of America on November 8 and 9, 1969, celebrated the fiftieth anniversary of its founding in Atlantic City, New Jersey. The celebration included the presentation of three special symposia, with Harry H. Hess of Princeton University as chairman of the symposia committee. He personally organized the sessions for a symposium on the Mineralogy and Petrology of the Upper Mantle. A symposium on Sulfides was organized by Gunnar Kullerud of the Geophysical Laboratory, and a symposium on the Mineralogy and Geochemistry of Non-Marine Evaporites was organized by Blair F. Jones of the U. S. Geological Survey.
    Pages: Online-Ressource (VIII, 319 Seiten)
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 58 (1954), S. 316-317 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 258-259 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The section studied comprises 250 m of carbonate rocks that include the Yudoma Formation of late Vendian age and the Pestrotsvet Formation of Tommotian age along the Aldan River (Dvortsy section, 57.47 N, 129.30 E, 650 km south of Yakutsk) on the Siberian Platform in Yakutia11"13. The ...
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A 330-metre core drilled through the marine Permian/Triassic boundary in the Carnic Alps of Austria allows closely correlated studies of geochemistry, petrography and palaeontology across the boundary. The isotope shifts and metal concentrations are extended, multiple and complex, and do not ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 78 (1989), S. 649-677 
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Profiles of carbon isotopes were studied in marine limestones of Late Permian and Early Triassic age of the Tethyan region from 20 sections in Yugoslavia, Greece, Turkey, Armenian SSR, Iran, Pakistan, India, Nepal, and China. The Upper Permian sections continue the high positive values of δ13C previously found in Upper Permian basins in NW Europe and western USA. In the more complete sections of Tethys it can now be demonstrated that the values of δ13C drop from the Murgabian to the Dzhulfian Stages of the Upper Permian, then sharply to values near zero during the last two biozones of the Dorashamian. These levels of δ13C sample the Tethys Sea and the world ocean, and equal values from deep-water sediments at Salamis Greece indicate that they apply to the whole water column. We hypothesize that the high values of δ13C are a consequence of Late Paleozoic storage of organic carbon, and that the declines represent an episodic cessation of this organic deposition, and partial oxidation of the organic reservoir, extending over a period of several million years. The carbon isotope profile may reflect parallel complexity in the pattern of mass extinction in Late Permian time.
    Abstract: Résumé Des profils isotopiques du carbone ont été établis dans des calcaires marins d'âge tardi-permien à éo-triasique répartis dans 20 endroits du domaine téthysien: Yougoslavie, Grèce, Turquie, République Socialiste dArménie, Iran, Pakistan, Inde, Népal et Chine. Les profils établis dans le Permien supérieur montrent les mêmes valeurs positives de δ13C observées antérieurement dans des bassins de même âge en Europe occidentale et dans l'ouest des USA. Dans les profils les plus complets de la Téthys, il est maintenant établi que les valeurs de δ13C décroissent depuis le Murgabien jusqu'au Dzhulfien (Permien supérieur) pour devenir proches de zéro dans les deux dernières biozones du Dorasharmen. Ces valeurs de δ13C sont caractéristiques de la Téthys et de l'Océan mondial; elles s'appliquent à toutes les profondeurs d'eau, comme en témoignent les valeurs fournies par des sédiments de mer profonde à Salamis (Grèce). Nous formulons l'hypothèse que les hautes valeurs de δ13C sont la conséquence du stockage du carbone organique au Paléozoïque supérieur et que leur décroissance traduit un arrêt épisodique de cette sédimentation organique, accompagné d'une oxydation partielle de la matière organique s'étendant sur une période de plusieurs Ma. L'influence parallèle des phénomènes d'extinction massive à le fin du Permien se refléterait également dans les profils isotopiques du carbone.
    Notes: Zusammenfassung Untersucht wurden Profiie von Kohlenstoff-Isotopen mariner Karbonate aus dem Oberperm und der Untertrias der Tethys-Region aus 20 Lokalitäten in Jugoslawien, Griechenland, der Türkei, der Sowjet-Republik Armenien, dem Iran, Pakistan, Indien, Nepal und China. Die oberpermischen Proben zeigen dieselben hohen positiven gd13C Werte, wie sie vorher auch aus den oberpermischen Becken NW-Europas und dem Westen der USA berichtet wurden. Anhand von vollständigeren Abschnitten der Tethys kann dargelegt werden, daß die δ13C Werte von der Murgabium- bis zur Dzhulfium-Phase des Oberperms abnehmen und dann innerhalb der letzten zwei Biozonen des Dorashamiums abrupt gegen Null verlaufen. Diese δ13C Niveaus sind repräsentativ für die Tethys und den Weltozean. Sie gelten außerdem für alle Wassertiefen, wie durch ähnliche Werte aus Tiefsee-Sedimenten von Salamis (Griechenland) bestätigt wird. Unsere Annahme ist, daß die hohen δ13C Werte auf spätpaläozoische Speicherung organischen Kohlenstoffs zurückzuführen ist. Die Abnahme stellt episodische Sedimentationsschwankungen des organischen Materials dar, während der die organischen Substanzen über einen Zeitraum von mehreren Millionen Jahren zum Teil aufoxidiert wurden. Das Kohlenstoff-Isotop Profil entspricht parallelisiert in etwa dem Muster des Massen-Aussterbens während des Oberperms.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 222-222 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - It is unfortunate that your "100 Years ago" on William Barlow's first paper on the relations of crystal structure to symmetry1 failed to give him credit by name. Barlow, one of the last in the English tradition of talented self-taught "amateurs", went on to devise a completely original ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 337-339 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Carbon isotope ratios in sea-water bicarbonate depend on the relative net fluxes of carbon into buried organic carbon of low 513C and carbonate rock of 513C equalling that of the bicarbonate8'9. Micritic marine limestones generally (but not invariably) preserve their primary carbon isotope ratios ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 403-408 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Catastrophic chemical events are characterised by sharp rises in δ34S in the surface of the whole world ocean, and by greater overshoots locally. Three events are recognised and named for the formation in which they are most sharply displayed. The sharpness of the rise in ...
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2024-01-19
    Keywords: 79-546; Bromine; Carnallite; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg79; Magnesium; North Atlantic/PLATEAU; Potassium; Ratio; Sample code/label; see reference(s); Soluble residue; Sylvite
    Type: Dataset
    Format: text/tab-separated-values, 628 data points
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