Zircon Ages of Basement Orthogneisses from the Northern Segment of the Araguaia Belt, Brazil
作者： C. A. V. Moura , H. E. Gaudette
DOI: 10.1007/978-94-011-4800-9_10
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摘要: Conventional U-Pb systematics in zircon and single Pb-evaporation methods were used to determine the age of igneous protolith basement orthogneisses that occur core several dome like structures northern segment Araguaia belt, Brazil. These studies carried out understand stratigraphic relationship among different gneisses, constrain interpretations concerning structural development as well its with adjacent Amazonian Craton. The ages indicate these gneisses are composed Archean (2.86 – 2.87 Ga) Early Proterozoic (1.86 rocks. geological outlined is TTG’s intruded by granitic Later, rocks deformed metamorphosed during which related Brasiliano/Pan-African cycle. presence a similar geologic association same craton, along previous geophysical interpretations, suggests Belt may fact, represent inliers Craton this belt.
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