Abstract
The metamorphic belt recognized in the Serido region, Rio Grande do Norte State, northeastern Brazil, is made up of metamorphosed sediments of Precambrian age which are considered to belong to the low-pressure type. The metamorphic pelitic rocks are divided in two parallel zones with a northeast direction, formed in the greenschist and cordicrite-amphibolite facies, respectively. The metamorphic gradient rises from west to east, the progressive mineralogical variation being represented by the appearencc, in order of increasing metamorphic grade, of the following minerals: chlorite, muscovite, biotite, garnet, staurolite, andalusite, cordiorite, sillimanite. The synkinematic phase characterized by granitic rocks of 550 m.y. was succeeded by numerous intrusions of pegmatites, some of them showing mineralizations. Among the metamorphic minerals cordierite is the most important and characteristic of the Serido belt.
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