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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Metamorphic and thermobarometry evolution of the metamafics/metabasics rocks in Pontalina region, state of Goiás

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Author(s):
Guillermo Rafael Beltran Navarro [1] ; Antenor Zanardo [2] ; Fabiano Tomazini da Conceição [3] ; Luiz Sérgio Amarante Simões [4]
Total Authors: 4
Affiliation:
[1] UNESP. Instituto de Engenharia Ambiental - Brasil
[2] UNESP. IGCE. Departamento de Petrologia e Metalogenia - Brasil
[3] UNESP. Instituto de Engenharia Ambiental - Brasil
[4] UNESP. IGCE. Departamento de Petrologia e Metalogenia - Brasil
Total Affiliations: 4
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 41, n. 2, p. 170-184, 2011-04-00.
Abstract

Abstract: At the Pontalina region, the Magmatic Arc of Goiás is constituted by orthogneisses, metasediments, metaultramafics and metamafic/metabasics, geochemically related to island arcs. Mineral assemblages related to metamorphic peak observed in the study area are typically of the amphibolite facies and were generated before or during the initial stage of the development of the main foliation (Sn). Thermobarometric data show the P and T conditions for the amphibole + plagioclase and plagioclase + garnet + amphibole assemblages in the metamafic/metabasic rocks correspond to amphibolite facies (medium to upper grade), and plot in the kyanite stability field. The results indicate that the metamorphic peak (M1) in the amphibolite facies (medium up to upper grade) reached temperatures slightly higher than 700ºC, not exceeding 775ºC, under conditions of medium pressure (~10 kbar). Thermobarometric and petrographic data, related to the metamorphism, indicate a clockwise P-T path for the surrounding rocks. (AU)