Integrated boron and mercury isotopes indicate that weakly dehydrated metasedimentary sources retain the volatiles needed to generate tin-fertile granites, highlighting metamorphic preconditioning as ...
THE Michikamau Intrusion is a mass of anorthosite and related rocks covering an area of about 900 square miles, centred at 54° 30′N. and 64°00′W. in Labrador, Newfoundland. The intrusion is one of a ...
The Brazilian territory consists, in the most part, of acidic soils, poor in nutrients such as potassium. To make production feasible, it is necessary to use high quantities of fertilizers, which ...
Figure 1. A limited amount of emeralds have so far been produced from the Fazenda Bonfim region in Brazil’s Rio Grande do Norte State. The faceted stones shown here weigh 1.29–1.92 ct, and the ...
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