New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil

New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism.

KEYWORDS:
Alkaline rocks; Ponta Grossa Arch; Geochronology

Authorship

Celso de Barros Gomes ^**Corresponding author.

Instituto de Geociências, Universidade de São Paulo, São Paulo (SP), Brazil. E-mails: cgomes@usp.br, rgazzone@usp.br, exrubert@usp.br, keisato@usp.br, gastonenrich@usp.brUniversidade de São PauloBrazilSão Paulo, SP, BrazilInstituto de Geociências, Universidade de São Paulo, São Paulo (SP), Brazil. E-mails: cgomes@usp.br, rgazzone@usp.br, exrubert@usp.br, keisato@usp.br, gastonenrich@usp.br

Rogério Guitarrari Azzone

Excelso Ruberti

Paulo Marcos de Vasconcelos

University of Queensland, Brisbane, Australia. E-mail: p.vasconcelos@uq.edu.auUniversity of QueenslandAustraliaBrisbane, AustraliaUniversity of Queensland, Brisbane, Australia. E-mail: p.vasconcelos@uq.edu.au

Kei Sato

Gaston Eduardo Enrich Rojas

*Corresponding author.

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (9)

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Figure 1:
Schematic map of the Ponta Grossa Arch (after Almeida 1986Almeida F.F.M. 1986. Distribuição regional e relações tectônicas do magmatismo Pós-Paleozóico do Brasil. Revista Brasileira de Geociências, 16(4):325-349., Ruberti et al. 2005Ruberti E., Gomes C.B., Comin-Chiaramonti P. 2005. The alkaline magmatism from the Ponta Grossa Arch. In: Comin-Chiaramonti P., & Gomes C.B. (eds.) Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform. São Paulo, Edusp/Fapesp , p. 473-522., modified). NW-SE tholeiitic dike swarms and alkaline occurrences are indicated as follows: 1) and 2) dikes inferred by field geology and aeromagnetic survey; 3) alkaline centres and abbreviations: BC, Bairro da Cruz; BIT, Barra do Itapirapuã; BN, Banhadão; BT, Barra do Teixeira; CN, Cananeia; IP, Ipanema; IT, Itapirapuã; JC, Jacupiranga; JF, José Fernandes; JQ, Juquiá: MP, Mato Preto; PAR, Pariquera-Açu; PI, Piedade; TU, Tunas. Other indications: I, Basement; II, Paraná Basin; III, Flood Basalts.

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Figure 2:
Radiometric ages for individual alkaline massifs from the Ponta Grossa Arch region. The range of values (grey bars) and the preferred age (black circles) for each occurrence are represented. N: number of analyses; AM: analytical method I, K-Ar; II, Ar-Ar; III, Rb-Sr; IV, U-Pb; R: references (a: Amaral et al. 1967Amaral G., Bushee J., Cordani U.G., Kawashita K., Reynolds J.H. 1967. Potassium-argon ages of alkaline rocks from Southern Brazil. Geochimica et Cosmochimica Acta, 31(2):117-142., Sonoki & Garda 1988Sonoki I.K., & Garda G.M. 1988. Idades K-Ar de rochas alcalinas do Brasil Meridional e Paraguai Oriental: compilação e adaptação às novas constantes de decaimento. Boletim do Instituto de Geociências-USP, Série Científica, 19:63-85.; b: CG, unpublished data; c: Ruberti 1984Ruberti E., & Gomes C.B. 1984. O Maciço alcalino do Banhadão, PR: geologia e petrografia. In: XXXIII Congresso Brasileiro de Geologia, Rio de Janeiro, Anais, 9:4400-4412.; d: Ruberti et al. 1997Ruberti E., Castorina F., Censi P., Gomes C.B., Speziale S., Comin-Chiaramonti P. 1997. REE-C-O-Sr-Nd systematic in carbonatites from Barra do Itapirapuã and Mato Preto in Southern Brazil. In: 1st South American Symposium on Isotope Geology, Campos do Jordão, Extended Abstracts, p. 271-275.; e: Gomes & Cordani 1965Gomes C.B., & Cordani U.G. 1965. Geocronologia do maciço alcalino de Itapirapuã (SP). Anais da Academia Brasileira de Ciências, 37:497-501.; f: Amaral 1978Amaral G. 1978. Potassium-Argon studies on the Jacupiranga Alkaline District, State of São Paulo, Brazil. In: 1st International Symposium on Carbonatites, Poços de Caldas, Proceedings, p. 297-302.; g: Roden et al. 1985Roden M.F., Murthy V.R., Gaspar J.C. 1985. Sr and Nd isotopic composition of the Jacupiranga carbonatite. The Journal of Geology, 93(2):212-290.; h: Chmyz et al. 2017Chmyz L., Arnaud N., Biondi J.C., Azzone R.G., Bosch D., Ruberti E. 2017. Ar-Ar ages, Sr-Nd isotope geochemistry, and implications for the origin of the silicate rocks of the Jacupiranga ultramafic-alkaline complex (Brazil). Journal of South American Earth Sciences, 77:286-309.; i: Almeida et al. 2017Almeida V.V., Janasi V.A., Heaman L.M., Shaulis B.J., Hollanda M.H.B.M., Renne P. 2017. Contemporaneous alkaline and tholeiitic magmatism in the Ponta Grossa Arch, Paraná-Etendeka Magamatic Province: Constraints from U-Pb zircon/baddeleyite and 40Ar/39Ar phlogopite dating of the José Fernandes Gabbro and mafic dykes. Journal of Volcanology and Geothermal Research, in press, doi: 10.1016/j.jvolgeores.2017.01.018.
https://doi.org/10.1016/j.jvolgeores.201... ; j: Born 1971Born H. 1971. O complexo alcalino de Juquiá, SP. PhD Thesis, Instituto de Geociências, Universidade de São Paulo, São Paulo, 77 p.; k: Machado Jr. 2000Machado Jr. D.L. 2000. Condicionantes estruturais e context tectônico do “Alinhamento Guapiara”. PhD Thesis, Instituto de Geociências, Universidade de São Paulo, São Paulo, 143 p.; l: Cordani & Hasui 1968Cordani U.G., & Hasui Y. 1968. Idades K/Ar de rochas alcalinas do primeiro planalto do Estado do Paraná. In: XXII Congresso Brasileiro de Geologia, Curitiba, Anais, p. 149-153.; m: Spinelli & Gomes 2008Spinelli F.P., & Gomes C.B. 2008. A ocorrência alcalina de Cananeia, Litoral Sul do Estado de São Paulo: geologia e geocronologia. Geologia USP, Série Científica, 8(2):53-64.; n: Siga Jr. et al. 2007Siga Jr. O., Gomes C.B., Sato K. , Passarelli C.R. 2007. O maciço alcalino de Tunas, PR: novos dados geocronológicos. Geologia USP, Série Científica, 7(2):71-80.).

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Figure 3:
(A) Sketch map indicating the Jacupiranga, Juquiá, Pariquera-Açu and Cananeia alkaline complexes at the Guapiara Lineament (after Ruberti et al. 2005Ruberti E., Gomes C.B., Comin-Chiaramonti P. 2005. The alkaline magmatism from the Ponta Grossa Arch. In: Comin-Chiaramonti P., & Gomes C.B. (eds.) Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform. São Paulo, Edusp/Fapesp , p. 473-522.). (B) Geological setting and distribution of alkaline complexes, plugs, dikes and dike swarms at the São Jerônimo-Curiúva Lineament (José Fernandes and Bairro da Cruz not included; after Vasconcellos & Gomes 1998Vasconcellos E.M.G., & Gomes C.B. 1998. Diques e plugs alcalinos da região do Vale do Ribeira, divisa dos estados do Paraná e São Paulo: características petrográficas e geoquímicas. Geochimica Brasiliensis, 12(2):123-143., modified). Captions: (1) and (2), alkaline occurrences (stocks, plugs and dikes); (3) Late Precambrian-Cambrian rocks (Neoproterozoic Três Córregos Granite included); (4) Mesoproterozoic metasedimentary and metaigneous rocks (Açungui Group included); (5) Faults, as suggested by mafic dikes; (6) and (7) Covered and well-defined faults, respectively.

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Figure 4:
Geological map of the Banhadão complex in the Ribeira Valley, Paraná state (Ruberti & Gomes 1984Ruberti E., & Gomes C.B. 1984. O Maciço alcalino do Banhadão, PR: geologia e petrografia. In: XXXIII Congresso Brasileiro de Geologia, Rio de Janeiro, Anais, 9:4400-4412.).

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Figure 5:
Geological map of the Itapirapuã syenitic complex emplaced into the Três Córregos granitic suite (Gomes 1970Gomes C.B. 1970. Petrologia do maciço alcalino de Itapirapuã, São Paulo. Boletim do Instituto de Geociências e Astronomia da USP, 1:77-188.). Carbonatite and magmatic breccia occurrences are indicated by C and B, respectively. Also showed is the location of the iron ore mine.

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Figure 6:
Incremental-heating spectra (A, C and E) and isochrons (B, D and F) for biotite of melteigitic rocks from the Banhadão complex. MSWD: mean standard weight deviation.

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Figure 7:
Incremental-heating spectra (A and C) and isochrons (B and D) for biotite of syenitic rocks from the Itapirapuã complex. MSWD: mean standard weight deviation.

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Figure 8:
Analytical results and error bars for titanite of melanite-nepheline syenites from the Itapirapuã complex. MSWD: mean standard weight deviation.

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Figure 9:
Plot of ²³⁸U/²⁰⁶Pb vs ²⁰⁷Pb/²⁰⁶Pb for titanite of melanite-nepheline syenites from the Itapirapuã complex. MSWD: mean standard weight deviation.

Figure 1: Schematic map of the Ponta Grossa Arch (after Almeida 1986Almeida F.F.M. 1986. Distribuição regional e relações tectônicas do magmatismo Pós-Paleozóico do Brasil. Revista Brasileira de Geociências, 16(4):325-349., Ruberti et al. 2005Ruberti E., Gomes C.B., Comin-Chiaramonti P. 2005. The alkaline magmatism from the Ponta Grossa Arch. In: Comin-Chiaramonti P., & Gomes C.B. (eds.) Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform. São Paulo, Edusp/Fapesp , p. 473-522., modified). NW-SE tholeiitic dike swarms and alkaline occurrences are indicated as follows: 1) and 2) dikes inferred by field geology and aeromagnetic survey; 3) alkaline centres and abbreviations: BC, Bairro da Cruz; BIT, Barra do Itapirapuã; BN, Banhadão; BT, Barra do Teixeira; CN, Cananeia; IP, Ipanema; IT, Itapirapuã; JC, Jacupiranga; JF, José Fernandes; JQ, Juquiá: MP, Mato Preto; PAR, Pariquera-Açu; PI, Piedade; TU, Tunas. Other indications: I, Basement; II, Paraná Basin; III, Flood Basalts.

Figure 2: Radiometric ages for individual alkaline massifs from the Ponta Grossa Arch region. The range of values (grey bars) and the preferred age (black circles) for each occurrence are represented. N: number of analyses; AM: analytical method I, K-Ar; II, Ar-Ar; III, Rb-Sr; IV, U-Pb; R: references (a: Amaral et al. 1967Amaral G., Bushee J., Cordani U.G., Kawashita K., Reynolds J.H. 1967. Potassium-argon ages of alkaline rocks from Southern Brazil. Geochimica et Cosmochimica Acta, 31(2):117-142., Sonoki & Garda 1988Sonoki I.K., & Garda G.M. 1988. Idades K-Ar de rochas alcalinas do Brasil Meridional e Paraguai Oriental: compilação e adaptação às novas constantes de decaimento. Boletim do Instituto de Geociências-USP, Série Científica, 19:63-85.; b: CG, unpublished data; c: Ruberti 1984Ruberti E., & Gomes C.B. 1984. O Maciço alcalino do Banhadão, PR: geologia e petrografia. In: XXXIII Congresso Brasileiro de Geologia, Rio de Janeiro, Anais, 9:4400-4412.; d: Ruberti et al. 1997Ruberti E., Castorina F., Censi P., Gomes C.B., Speziale S., Comin-Chiaramonti P. 1997. REE-C-O-Sr-Nd systematic in carbonatites from Barra do Itapirapuã and Mato Preto in Southern Brazil. In: 1st South American Symposium on Isotope Geology, Campos do Jordão, Extended Abstracts, p. 271-275.; e: Gomes & Cordani 1965Gomes C.B., & Cordani U.G. 1965. Geocronologia do maciço alcalino de Itapirapuã (SP). Anais da Academia Brasileira de Ciências, 37:497-501.; f: Amaral 1978Amaral G. 1978. Potassium-Argon studies on the Jacupiranga Alkaline District, State of São Paulo, Brazil. In: 1st International Symposium on Carbonatites, Poços de Caldas, Proceedings, p. 297-302.; g: Roden et al. 1985Roden M.F., Murthy V.R., Gaspar J.C. 1985. Sr and Nd isotopic composition of the Jacupiranga carbonatite. The Journal of Geology, 93(2):212-290.; h: Chmyz et al. 2017Chmyz L., Arnaud N., Biondi J.C., Azzone R.G., Bosch D., Ruberti E. 2017. Ar-Ar ages, Sr-Nd isotope geochemistry, and implications for the origin of the silicate rocks of the Jacupiranga ultramafic-alkaline complex (Brazil). Journal of South American Earth Sciences, 77:286-309.; i: Almeida et al. 2017Almeida V.V., Janasi V.A., Heaman L.M., Shaulis B.J., Hollanda M.H.B.M., Renne P. 2017. Contemporaneous alkaline and tholeiitic magmatism in the Ponta Grossa Arch, Paraná-Etendeka Magamatic Province: Constraints from U-Pb zircon/baddeleyite and 40Ar/39Ar phlogopite dating of the José Fernandes Gabbro and mafic dykes. Journal of Volcanology and Geothermal Research, in press, doi: 10.1016/j.jvolgeores.2017.01.018.
https://doi.org/10.1016/j.jvolgeores.201... ; j: Born 1971Born H. 1971. O complexo alcalino de Juquiá, SP. PhD Thesis, Instituto de Geociências, Universidade de São Paulo, São Paulo, 77 p.; k: Machado Jr. 2000Machado Jr. D.L. 2000. Condicionantes estruturais e context tectônico do “Alinhamento Guapiara”. PhD Thesis, Instituto de Geociências, Universidade de São Paulo, São Paulo, 143 p.; l: Cordani & Hasui 1968Cordani U.G., & Hasui Y. 1968. Idades K/Ar de rochas alcalinas do primeiro planalto do Estado do Paraná. In: XXII Congresso Brasileiro de Geologia, Curitiba, Anais, p. 149-153.; m: Spinelli & Gomes 2008Spinelli F.P., & Gomes C.B. 2008. A ocorrência alcalina de Cananeia, Litoral Sul do Estado de São Paulo: geologia e geocronologia. Geologia USP, Série Científica, 8(2):53-64.; n: Siga Jr. et al. 2007Siga Jr. O., Gomes C.B., Sato K. , Passarelli C.R. 2007. O maciço alcalino de Tunas, PR: novos dados geocronológicos. Geologia USP, Série Científica, 7(2):71-80.).

Figure 3: (A) Sketch map indicating the Jacupiranga, Juquiá, Pariquera-Açu and Cananeia alkaline complexes at the Guapiara Lineament (after Ruberti et al. 2005Ruberti E., Gomes C.B., Comin-Chiaramonti P. 2005. The alkaline magmatism from the Ponta Grossa Arch. In: Comin-Chiaramonti P., & Gomes C.B. (eds.) Mesozoic to Cenozoic alkaline magmatism in the Brazilian Platform. São Paulo, Edusp/Fapesp , p. 473-522.). (B) Geological setting and distribution of alkaline complexes, plugs, dikes and dike swarms at the São Jerônimo-Curiúva Lineament (José Fernandes and Bairro da Cruz not included; after Vasconcellos & Gomes 1998Vasconcellos E.M.G., & Gomes C.B. 1998. Diques e plugs alcalinos da região do Vale do Ribeira, divisa dos estados do Paraná e São Paulo: características petrográficas e geoquímicas. Geochimica Brasiliensis, 12(2):123-143., modified). Captions: (1) and (2), alkaline occurrences (stocks, plugs and dikes); (3) Late Precambrian-Cambrian rocks (Neoproterozoic Três Córregos Granite included); (4) Mesoproterozoic metasedimentary and metaigneous rocks (Açungui Group included); (5) Faults, as suggested by mafic dikes; (6) and (7) Covered and well-defined faults, respectively.

Figure 4: Geological map of the Banhadão complex in the Ribeira Valley, Paraná state (Ruberti & Gomes 1984Ruberti E., & Gomes C.B. 1984. O Maciço alcalino do Banhadão, PR: geologia e petrografia. In: XXXIII Congresso Brasileiro de Geologia, Rio de Janeiro, Anais, 9:4400-4412.).

Figure 5: Geological map of the Itapirapuã syenitic complex emplaced into the Três Córregos granitic suite (Gomes 1970Gomes C.B. 1970. Petrologia do maciço alcalino de Itapirapuã, São Paulo. Boletim do Instituto de Geociências e Astronomia da USP, 1:77-188.). Carbonatite and magmatic breccia occurrences are indicated by C and B, respectively. Also showed is the location of the iron ore mine.

Figure 6: Incremental-heating spectra (A, C and E) and isochrons (B, D and F) for biotite of melteigitic rocks from the Banhadão complex. MSWD: mean standard weight deviation.

Figure 7: Incremental-heating spectra (A and C) and isochrons (B and D) for biotite of syenitic rocks from the Itapirapuã complex. MSWD: mean standard weight deviation.

Figure 8: Analytical results and error bars for titanite of melanite-nepheline syenites from the Itapirapuã complex. MSWD: mean standard weight deviation.

Figure 9: Plot of ²³⁸U/²⁰⁶Pb vs ²⁰⁷Pb/²⁰⁶Pb for titanite of melanite-nepheline syenites from the Itapirapuã complex. MSWD: mean standard weight deviation.

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New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil

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[1] *Corresponding author.