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Field visit to the Neoproterozoic Dom Feliciano Beltsoutheastern Brazil in 2000

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  • Earth Science

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Journal or Geosciences. Osaka City University Vol. 44. Arl. 3. p. 41-56. March. 2001 Field Visit to the Neoproterozoic Dom Feliciano Belt, Southeastern Brazil in 2000 Masaru YOSHIDA l , Leo A. Hartmann 2 and Luis A.D. Fernandes2 JDepartment of Geosciences, Faculty of Science, Osaka City University. Osaka 558-8585, Japan (Present address: Gondwana Institute for Geology and Environment, Hashimoto 648-0091, Japan. [email protected]) 21nstitute of Geosciences, Federal University of Rio Grande do Sui, 91501-970 Porto Alegre, Brazil. [email protected] (LAH), [email protected] (LADF) Abstract Six days field traverse of the Southern Sector of the Proterozoic Mantiquiera Province including the Dom Fel iciano Belt of southeastern Brazi I was conducted inA ugust 2000. Th is area is composed of the western Vila Nova Belt which is the eo proterozoic juvenile accretionary complexes, the central Tijucas Belt which is a Neoproterozoic reworked schist belt of volcano-sedimentary rocks possibly representing a continelllal magmatic arc, and the eastern Dom Feliciano Belt (sensu stricto) which is a Neoproterozoic reworked migmatite-granite terrain with remnants of Paleoproterozoic gneissic blocks. Rocks of these belts are intruded by many late to post orogenic granite masses, and between the first two belts are developed late orogenic Neoproterozoic basin sediments. Some good outcrops of all geologic units were visited, resulted in the collection of field observations and rock samples. A brief review of the present knowledge of this belt, and field observations of several important outcrops accompanied with several field photographic pictures are given. Key-words: Dom Feliciano Belt; Brasiliano orogeny; Vila Nova Belt; Tijucas Belt; Pelotas Batholith INTRODUCTION Understand ing the fu ndamental geotecton ic struc- ture of an orogenic belt is principally important for recon tructing the crustal evolution of the belt. Recent geological, structural and geochronological studies in the Sou

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