984 resultados para MINAS ANTIPERSONALES - CAMBOYA


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Inscripción en parte inferior: "E Tabula Romae in Capitolio asservata"

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"Com um appendice sobre a nova lorena diamantina, sua descripção, suas producções mineralógicas, e utilidades que d'este paiz possam resultar ao estado."

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At head of title 1902-1939: Ministerio de Fomento.

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Ar-40/Ar-39 laser incremental-heating analyses of 22 individual grains of supergene cryptomelane from three weathering profiles, up to 400 km apart, in the Rio Doce valley and Barbacena regions at Minas Gerais, Brazil, show that the formation of weathering profiles in these regions is contemporaneous, suggesting a strong weathering event in the Middle to Late Miocene (10-8 Ma). The preservation of these Miocene samples at or near the present surface suggests that either erosion rates have been very low in the region since the Miocene or that a much thicker weathering mantle was present in the region originally. Assuming a constant thickness of weathering profiles in the region throughout the Tertiary, we may calculate weathering front propagation rates of 4-8 m Myr(-1) during the past 10 Ma. Copyright (C) 2004 John Wiley Sons, Ltd.