926 resultados para Three-day sickness in cattle
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Fossil manganese nodules and encrustations from seamount' and basin' localities in the Transdanubian Central Mountains of Hungary are lithologically, mineralogically and chemically similar to some modern marine ferromanganese oxide deposits, and show no evidence of postdepositional changes other than cementation. Five groups of deposits were encountered: Fe/Mn nodules, encrusted shells, pavements, stains, and Fe oxide encrusted intraclasts, the first three of which are specific to the 'seamount' environment and the last to the basins'. Optical and electron microprobe investigation of the samples shows them to exhibit many similarities with modern ferromanganese oxide deposits, and that many of the nodules are surrounded by a halo of dispersed ferromanganese oxides, strongly suggesting that they continued to accrete metals through the pore waters of unlithified sediments for a period after burial. By contrast, pavements which appear to have grown on hardgrounds at the sea floor show little or no evidence of derivation of metals from underlying sediments. Geochemical investigations on the deposits show the seamount' varieties to be closer in composition to most modern nodules and crusts than the basin' varieties, and that the latter are essentially manganese and trace-element-poor ferruginous deposits. Nevertheless, all can be more or less compositionally equated with modern ferromanganese oxide deposits forming in marginal Atlantic environments, which would be in accord with the proposed depositional environment of the Transdanubian Central Mountains based on other evidence.
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Handwritten on verso: civil war volunteer. Printed sticker on verso: W. Nessler
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Transportation Department, Office of University Research, Washington, D.C.
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Mode of access: Internet.
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Bibliography: p. 605-613.
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Vols. for <1870>- published in Wellington by the government printer.
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"Supported in part by the Atomic Energy Commission."
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Louis Léopold Boilly; 11 47/64 in. x 1 ft. 2 3/8 in.; black chalk with white chalk heightening and stumping on beige paper
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"Supported by Office of Naval Research [under Contract N6-ONR-27135]"
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Bibliography: p. 75-76.
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Cover title.