The Early Cretaceous volcanic rocks of southern Uruguay comprise KEY WORDS: South America; flood basalts; felsic volcanics; crustal melts; mafic and felsic volcanics. The position of these outcrops at the plume southern edge of the Parana -Etendeka continental flood basalt province provides an opportunity to investigate possible lateral variations in both mafic and more evolved rock types towards the margins of such an area of plume-related magmatism. The mafic
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Kirstein et al. (2000) studied this question.
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