Abstract
The Urandi Metavolcanosedimentary Sequence (UMS) is located in the northern portion of the Aracuai Orogen. Its basement consists of rocks from the Santa Isabel Complex. This unit represents one of the metavolcanosedimentary sequences of the southern portion of the Gaviao Block. The geological mapping, performed on a scale of 1:2,000, allowed the identification of amphibolitic metabasalts, itabirites, metapelites, queluzites, marbles, calcic-silicate rocks and quartzites. The structural survey allowed the identification of three deformational and compressional stages: Dn; Dn+1 (divided into Dn+1' and Dn+1''), which were nucleated under an E-W to NE-SE orientated stress field; and Dn+2, whose structures reflect a WSW-ENE orientated stress field. The two most ancient stages are possibly related to the deformations of Rhyacian-Orosirian age, while the last deformational stage reflects the interactions between the substrate from the Paramirim Aulacogen and the Aracuai Orogen. The mineral paragenesis that was observed suggests amphibolite facies condition for the first two stages and greenschist for the last one.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
