Mineralochemistry of the rocks of the Sienitic Itabuna Batolith, Southern of Bahia State

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DOI:

https://doi.org/10.11606/issn.2316-9095.v22-190648

Keywords:

Mineral chemistry, SiO2 subsaturated rocks, Intensive parameters

Abstract

The Itabuna Syenitic Batholith (450 km2, 476 Ma) is intrusive in granulitic rocks of the São Francisco Craton and is part of the Southern Bahia Alkaline Province. This neoproterozoic batholith consists of syenites, monzonites, foid syenites, diorites, and gabbros. Representative rocks from this batholith were studied with optical petrography and Scanning Electron Microscopy (SEM) and spot chemical analyses were obtained with EDS and WDS. The rocks have fine to coarse gran size. The minerals present are: alkali feldspars, plagioclase, nepheline, amphibole, clinopyroxene, biotite, apatite, sodalite, cancrinite, ilmenite, magnetite, pyrite, chalcopyrite, zirconolite, olivine, allanite, baddeleyite, zircon, calcite, monazite, titanite, barite, bastnasite, and thorite. The matrix is composed mainly of alkali feldspars (albite and microcline), plagioclase, and nepheline. Perthitic and antiperthitic intergrown, albite, microcline, and plagioclase with compositions from albite to labradorite were identified. Brown mica corresponds to crystals of siderophyllite, lepidomelane, and Fe-biotite. Clinopyroxene has compositions of diopside, hedenbergite, and augite. Amphiboles is of Ca, Fe-Mg-Mn-Li, and Na-Ca varieties. Chemical data indicate that biotite, amphibole, allanite, and zirconolite are primary crystals. Clinopyroxene crystals register maximum temperatures of 939°C in the foid syenite, 959°C in the syenites, and 916°C in the monzonites with maximum pressures of 5.2 Kbar in the monzonite crystals, and predominantely high  xygen fugacity. Biotite crystals register maximum temperatures and pressures of 789°C and 2.2 kbar, respectively. Ilmenite-magnetite exsolution occurred at temperatures below 600°C. The compilation and interpretation of the data allow us to infer fractional crystallization as the main process responsible for the evolution of the rocks from the Itabuna Sienitic Batholith, similarly, to what was already proposed for other bodies of the province.

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2022-06-03

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Vol. 22 No. 2 (2022)

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Copyright (c) 2022 Marcel Vinicius Santos Leandro, Herbet Conceição, Maria de Lourdes da Silva Rosa, Gisele Tavares Marques, Claudio Nery Lamarão

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How to Cite

Leandro, M. V. S., Conceição, H. ., Rosa, M. de L. da S. ., Marques, G. T. ., & Lamarão, C. N. . (2022). Mineralochemistry of the rocks of the Sienitic Itabuna Batolith, Southern of Bahia State. Geologia USP. Série Científica, 22(2), 3-27. https://doi.org/10.11606/issn.2316-9095.v22-190648

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