980 resultados para TRANSANTARCTIC MOUNTAINS


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This brochure deals with policies and policy instruments needed to promote sustainable development in mountain areas. The first part presents an overview of key issues in mountain development, and principles and strategies that should be adopted. Each principle contains a checklist for policy-makers. The second part presents national and regional case studies of successful approaches and initiatives relating to mountain policy from all over the world. The brochure concludes with a call for multi-level initiatives and partnerships. This full-colour publication is part of the Mountains of the World series. It was prepared for the 2002 World Summit on Sustainable Development in Johannesburg by an international panel of experts coordinated by CDE. It was commissioned and funded by the Swiss Agency for Development and Cooperation (SDC).

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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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Proceedings of the Iowa academy of sciences. v.12, p.87-100, pl.22-27, 1905.

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At head of title: Canada. Department of mines. Geological survey branch.