Petrogenesis and Geothermobarometry in the Calc silicate gneisses of Ponta Grossa, Itapema (SC): evidence of regional metamorphism with high thermal flux in the eastern region of the Brusque Complex
DOI:
https://doi.org/10.22456/1807-9806.146327Keywords:
Dom Feliciano Belt, Tijucas Terrain, Brusque Complex, Petrogenesis, GeothermobarometryAbstract
The Brusque Complex is composed of metavolcano-sedimentary rocks of clastic and chemical nature and constitutes the main unit of the Tijucas Terrane in the state of Santa Catarina. The protoliths of these rocks were deposited in an ensialic or passive margin basin installed on the Archean-Paleoproterozoic crust. The metavolcanic rocks of the complex have a basic composition and have characteristics of continental tholeiites. They are intercalated in a concordant manner with the metasedimentary rocks and are interpreted as records of magmatism contemporary with the sedimentation of the precursor basin. On the east coast of Ponta Grossa, in the municipality of Itapema, calc-silicate gneisses outcrop with notable compositional banding consisting of continuous and mm-thick levels with variable contents of hornblende, biotite, quartz, plagioclase, diopside, magnetite, and ilmenite. In these exposures, mafic gneisses are intercalated with layers of pelitic schists of varying thickness. The compositional variation in continuous layers and the alternation between the mineral components found at each band suggest an origin from the mixing of carbonate mud and volcanic ash, indicating that part of the volcanism found in the Brusque Complex may have a subaerial origin. The banded structure characterizes a relict depositional surface (S0) that is parallel to the regional foliation. The development of intrafolial folds with tight to recumbent forms records the transposition of the S1 and S0 foliations and generates an S2 crenulation cleavage. Microprobe analyses were performed in a para-amphibolite level and indicated that the mafic gneisses are composed of magnesian hornblende and oligoclase (An20-30). The metamorphic crystallization temperature of the S2 foliation, defined by the Pl-Hb geothermobarometer in the calc-silicate gneisses, is 628°C, with a lithostatic pressure of 2.22 Kbar. These conditions were reached by heat transfer originating from the emplacement of magmatic bodies belonging to the Valsungana and Nova Trento suites.
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