U-Pb SHRIMP dating of the Itabaiana Dome: a Mesoarchean basement inlier (2.83 Ga) in the Sergipano Orogenic System, Borborema Province

Rosa, Maria de Lourdes da Silva; Conceição, Joane Almeida da; Marinho, Moacyr Moura; Pereira, Fábio dos Santos; Conceição, Herbet

doi:10.1590/2317-4889202020190106

Maria de Lourdes da Silva Rosa ^**Corresponding author.

Programa de Pós-Graduação em Geociências e Análise de Bacias, Universidade Federal de Sergipe - São Cristóvão (SE), Brazil. E-mail: lrosa@ufs.br, herbet@ufs.br

https://orcid.org/0000-0002-5099-829X

Joane Almeida da Conceição

Universidade Federal do Oeste da Bahia - Barreiras (BA), Brazil. E-mail: joane.conceicao@ufob.edu.br

https://orcid.org/0000-0002-2453-6251

Moacyr Moura Marinho

Universidade Federal da Bahia - Salvador (BA), Brazil. E-mail: mmm@ufba.br

https://orcid.org/0000-0002-2143-5594

Fábio dos Santos Pereira

Universidade Federal do Pará - Belém (PA), Brazil. E-mail: fabio.santos.pereira@hotmail.com

https://orcid.org/0000-0002-8496-6501

Herbet Conceição

Programa de Pós-Graduação em Geociências e Análise de Bacias, Universidade Federal de Sergipe - São Cristóvão (SE), Brazil. E-mail: lrosa@ufs.br, herbet@ufs.br

https://orcid.org/0000-0002-9172-4519

*Corresponding author.

M.R. wrote the manuscript, managed the corrections and performed the geochronological analysis; J.C. contributed to field work and collected and processed sample; M.M. obtained and discussed the geochemical data; F.P. helped to process and discuss the U-Pb data and made the figures and tables; H.C. contributed to write and revise the manuscript.

Competing interests: The authors declare no competing interests.

Figures (4)
Tables (2)

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Figure 1.
(A) Scheme of the Borborema Province, according to Van Schmus et al. (1995Van Schmus W.R., Brito Neves B.B, Hackspacher P., Babinski M. 1995. U/Pb and Sm/Nd geochronologic studies of the eastern Borborema Province, Northeastern Brazil: initial conclusions. Journal of South American Earth Sciences, 8(3-4):267-288. https://doi.org/10.1016/0895-9811(95)00013-6
https://doi.org/https://doi.org/10.1016/... ). (B) Geological scheme of the southern portion of Borborema Province, showing the geological domains of the Sergipano Orogenic System (adapted from Davison and Santos 1989Davison I., Santos R.A. 1989. Tectonic Evolution of the Sergipano Fold Belt, NE Brasil, during Brasiliano Orogeny. Precambrian Research, 45(4):319-342. https://doi.org/10.1016/0301-9268(89)90068-5
https://doi.org/https://doi.org/10.1016/... ). Macururé (MCZ), Belo Monte-Jeremoabo (BMJZC), São Miguel do Aleixo (SMACZ), Itaporanga (ICZ) shear zones, Pernambuco-Alagoas Superterrane (PEAL).

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Figure 2.
Geological map of the Itabaiana Dome region (Teixeira 2014Teixeira L.R. 2014. Mapa Geológico e de Recursos Minerais do Estado de Sergipe. Escala: 1:250.000. Brasil, CPRM.). The yellow star indicates the location of the dated outcrop, sample FDS-395.

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Figure 3.
Backscattered electron images (BSE) of zircons of sample FDS-395 from Itabaiana Dome. The figure also shows the position of the analyzed spots listed in .

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Figure 4.
Concordia diagrams for the melanosome zircon crystals of migmatitic gneiss of trondhjemitic composition in the Itabaiana Dome. The ages and ellipses of error are presented in 2σ of uncertainty. (A) Discordia age. (B) Concordia Age. The blue ellipse corresponds to the age calculated from the concordant crystals.

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Table 1.
Summary of U-Pb Sensitive high-resolution ion microprobe (SHRIMP) data in migmatitic trondhjemitic gneiss zircon crystals of the Itabaiana Dome.

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Table 2.
Compilation of geochronological data from Archean rocks of the northeastern part of the São Francisco Craton in the states of Sergipe and Bahia.

Spot	f ₂₀₆ ^a	²³² Th/ ²³⁸ U ^b	Isotopic ratios							Age (Ma)
Spot	f ₂₀₆ ^a	²³² Th/ ²³⁸ U ^b	²⁰⁷ Pb/ ²⁰⁶ Pb ^d	1σ	²⁰⁷ Pb/ ²³⁵ U	1σ	²⁰⁶ Pb/ ²³⁸ U	1σ	Rho^e	²⁰⁶ Pb/ ²³⁸ U	²⁰⁷ Pb/ ²⁰⁶ Pb	%Disc^f
1.1	0.048	0.76	0.2017	0.6	14.4246	2.3	0.5188	2.2	0.960	2694 ± 49	2840 ± 11	5
2.1*	0.030	0.70	0.2018	0.5	15.3267	2.3	0.5509	2.2	0.976	2829 ± 51	2841 ± 8	0
3.1*	0.072	0.78	0.2015	0.6	15.0460	2.5	0.5415	2.4	0.966	2790 ± 54	2839 ± 10	2
4.1	0.079	0.80	0.2018	0.6	16.3501	2.4	0.5875	2.3	0.961	2979 ± 54	2841 ± 11	-5
5.1	0.117	0.32	0.1641	0.6	6.1419	2.4	0.2714	2.3	0.972	1548 ± 32	2499 ± 9	61
6.1*	0.399	0.69	0.2002	0.8	14.9344	2.4	0.5411	2.2	0.936	2788 ± 50	2828 ± 14	1
7.1	0.538	0.32	0.1619	1.0	6.3428	2.5	0.2841	2.3	0.922	1612 ± 33	2476 ± 16	54
8.1*	0.094	0.80	0.1990	0.6	15.0849	2.5	0.5498	2.4	0.967	2824 ± 55	2818 ± 10	0
9.1	0.113	0.35	0.1686	0.6	6.2617	2.2	0.2694	2.2	0.957	1538 ± 29	2544 ± 11	65
10.1	0.109	0.32	0.1716	0.5	7.1358	2.2	0.3016	2.2	0.975	1699 ± 32	2573 ± 8	51
11.1	0.044	0.33	0.1637	0.5	6.0753	2.3	0.2692	2.2	0.974	1537 ± 30	2494 ± 9	62
12.1	0.147	0.33	0.1642	0.6	5.9920	2.3	0.2647	2.2	0.966	1514 ± 30	2499 ± 10	65

Geologic unit	Pluton or area	Age (Ma)/T_DM (Ga)	Reference
Salvador-Esplanada Belt	Aporá Gneiss	2924 ± 25	*Silva et al. (2002*Silva L.C., Armstrong R., Delgado I.M., Pimentel M., Arcanjo J.B., Melo R.C., Teixeira L.R., Jost H., Cardoso Filho J.M., Pereira L.H.M. 2002. Reavaliação da evolução geológica em terrenos pré-cambrianos brasileiros com base em novos dados U-Pb SHRIMP, parte I: limite centro-oriental do Cráton do São Francisco na Bahia. Revista Brasileira de Geociências, 32(4):501-512. https://doi.org/10.25249/0375-7536.2002324501512 https://doi.org/https://doi.org/10.25249... )
Uauá Complex	Maracanã Gneiss	3025 ± 13	*Rios et al. (2009*Rios D.C., Davis D.W., Conceição H., Davis W.J., Rosa M.L.S., Dickin A.P. 2009. Geologic evolution of the Serrinha Nucleous granite-greenstone terrane (NE Bahia, Brazil) constrained by U-Pb single zircon geochronology. Precambrian Research, 170(3-4):175-201. https://doi.org/10.1016/j.precamres.2008.10.001 https://doi.org/https://doi.org/10.1016/... )
	Uauá Area/Mafic Granulite (I)	3127 ± 14	*Oliveira et al. (2019*Oliveira E.P., Talavera C., Windley B.F., Zhao L., Semprich J.J., McNaughton N.J., Amaral W.S., Sombini G., Navarro M., Silva D. 2019. Mesoarchaean (2820 Ma) high-pressure mafic granulite at Uauá, São Francisco Craton, Brazil, and its potential significance for the assembly of Archaean supercratons. Precambrian Research, 331:105366. https://doi.org/10.1016/j.precamres.2019.105366 https://doi.org/https://doi.org/10.1016/... )
	Uauá Area/Mafic Granulite (M)	2819 ± 14	*Oliveira et al. (2019*Oliveira E.P., Talavera C., Windley B.F., Zhao L., Semprich J.J., McNaughton N.J., Amaral W.S., Sombini G., Navarro M., Silva D. 2019. Mesoarchaean (2820 Ma) high-pressure mafic granulite at Uauá, São Francisco Craton, Brazil, and its potential significance for the assembly of Archaean supercratons. Precambrian Research, 331:105366. https://doi.org/10.1016/j.precamres.2019.105366 https://doi.org/https://doi.org/10.1016/... )
Santa Luz Complex	Valente Gneiss	3102 ± 5	*Rios et al. (2009*Rios D.C., Davis D.W., Conceição H., Davis W.J., Rosa M.L.S., Dickin A.P. 2009. Geologic evolution of the Serrinha Nucleous granite-greenstone terrane (NE Bahia, Brazil) constrained by U-Pb single zircon geochronology. Precambrian Research, 170(3-4):175-201. https://doi.org/10.1016/j.precamres.2008.10.001 https://doi.org/https://doi.org/10.1016/... )
Paleoproterozoic Magmatism	Morro do Afonso Syenite (X)	2641 ± 4	*Rios et al. (2009*Rios D.C., Davis D.W., Conceição H., Davis W.J., Rosa M.L.S., Dickin A.P. 2009. Geologic evolution of the Serrinha Nucleous granite-greenstone terrane (NE Bahia, Brazil) constrained by U-Pb single zircon geochronology. Precambrian Research, 170(3-4):175-201. https://doi.org/10.1016/j.precamres.2008.10.001 https://doi.org/https://doi.org/10.1016/... )
Paleoproterozoic Magmatism	Poço Grande Granite	2645 ± 70	*Melo et al. (1995*Melo R.C., Loureiro H.S.C., Pereira L.H.M. 1995. Programa Levantamentos Geológicos Básicos do Brasil: Folha Serrinha (SC.24-Y-D). Estado da Bahia. Escala 1:250.000. Brasília, CPRM, 86 p.)
Esplanada Boquim Granulitic Complex	Pedrinhas Area	2473 ± 13/(2.6 Ga)	Oliveira (2014Oliveira E.M. 2014. Petrografia, litogeoquímica e geocronologia das rochas granulíticas da parte norte do Cinturão Salvador-Esplanada-Boquim, Bahia-Sergipe. PhD Thesis, Universidade Federal da Bahia, Salvador, 218 p.)
Esplanada Boquim Granulitic Complex	Boquim Area	2582 ± 11/(2.9 Ga) 2683 ± 13	Oliveira (2014Oliveira E.M. 2014. Petrografia, litogeoquímica e geocronologia das rochas granulíticas da parte norte do Cinturão Salvador-Esplanada-Boquim, Bahia-Sergipe. PhD Thesis, Universidade Federal da Bahia, Salvador, 218 p.)

[1] *Corresponding author.

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U-Pb SHRIMP dating of the Itabaiana Dome: a Mesoarchean basement inlier (2.83 Ga) in the Sergipano Orogenic System, Borborema Province

Abstract