Late Ediacaran lateral-escape tectonics as recorded by the Patos shear zone (Borborema Province, NE Brazil)

Archanjo, Carlos José; Hollanda, Maria Helena Bezerra Maia de; Viegas, Luis Gustavo Ferreira

doi:10.1590/2317-4889202120200132

Carlos José Archanjo ^**Corresponding author.

Instituto de Geociências, Universidade de São Paulo – São Paulo (SP), Brazil. E-mails: archan@usp.br, hollanda@usp.br

https://orcid.org/0000-0003-4618-7790

Maria Helena Bezerra Maia de Hollanda

Instituto de Geociências, Universidade de São Paulo – São Paulo (SP), Brazil. E-mails: archan@usp.br, hollanda@usp.br

https://orcid.org/0000-0003-2231-7917

Luis Gustavo Ferreira Viegas

Instituto de Geociências, Universidade de Brasília – Brasília (DF), Brazil. E-mail: lgviegas@unb.br

https://orcid.org/0000-0002-9945-6256

*Corresponding author.

C.J.A.: conceptualization, methodology, formal analysis, fund acquisition, writing. M.H.H.: methodology, formal analysis, fund acquisition, review. L.G.V.: methodology, data curation, review.

Competing interest: The authors declare no competing interests.

Figures (10)
Tables (1)

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Figure 1
(A) Schematic tectonic map of the India-Eurasia collision showing the extrusion of Indochina and (B) main structures of Brazilian Platform highlighting major continental shear zones such as the Transbrasiliano Lineament (TBL), Patos (PaSZ) and Pernambuco (PeSZ) shear zones (modified from Cordani et al. 2016Cordani U.G., Ramos V.A., Fraga L.M., Cegarra M., Delgado I., de Souza K.G., Gomes E.F.M., Schobbenhaus C. 2016. Tectonic map of South America at 1:5.9 M. CGMW-CPRM-SEGEMAR.). The Transbrasiliano Lineament was traced in the Borborema Province (shaded area) according to Daly et al. (2014)Daly M.C., Andrade V., Barousse C.A., Costa R., McDowell K., Piggott N., Poole A.J. 2014. Brasiliano crustal structure and the tectonic setting of the Parnaíba basin of NE Brazil: Results of a deep seismic reflection profile. Tectonics, 33(11):2102-2120. https://doi.org/10.1002/2014TC003632
https://doi.org/10.1002/2014TC003632... .

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Figure 2
Borborema Province (inset) showing the distribution of Archean and Siderian rocks along the Seridó (S), Lavras da Mangabeira (LM) and Ipueirunha (Ip) belts. Ages (in Ga) in the Granjeiro Complex from (a) Ferreira et al. (2019)Ferreira A.C.D., Ferreira Filho C.F., Dantas E.L., Souza V.S. 2019. Paleoproterozoic mafic-ultramafic magmatism in the Northern Borborema Province, Northeast Brazil: Tectonic setting and potential for deposits. Journal of Geology, 127(5):483-504. https://doi.org/10.1086/704256
https://doi.org/10.1086/704256... , (b) Cavalcante et al. (2016)Cavalcante G.C.G., Viegas L.G., Archanjo C.J., Silva M.E. 2016. The influence of partial melting and melt migration on the rheology of the continental crust. Journal of Geodynamics, 101:186-199. https://doi.org/10.1016/j.jog.2016.06.002
https://doi.org/10.1016/j.jog.2016.06.00... , (c) Hollanda et al. (2011)Hollanda M.H.B.M., Archanjo C.J., Souza L.C., Dunyi L., Armstrong R. 2011. Long-lived Paleoproterozoic granitic magmatism in the Seridó-Jaguaribe domain, Borborema Province - NE Brazil. Journal of South American Earth Sciences, 32(4):287-300. https://doi.org/10.1016/j.jsames.2011.02.008
https://doi.org/10.1016/j.jsames.2011.02... , (d) this study, (e) Silva et al. (1997)Silva L.C., McNaughton N.J., Vasconcelos A.M., Gomes J.R.C, Fletcher L.R. 1997. U-Pb SHRIMP ages in the Southern State of Ceará, Borborema Province, NE Brazil: Archean TTG accretion and Proterozoic crustal reworking. In: International Symposium on Granites and Associated Mineralizations, 2., 1997. Annals…, p. 280-281. and (f) Pitarello et al. (2019)Pitarello M.Z., Santos T.J.S., Ancelmi M.F. 2019. Syn- to post-depositional processes related to high grade metamorphic BIFs: Geochemical and geochronological evidences from a Paleo to Neoarchean (3/5-2.6 Ga) terrane in NE Brazil. Journal of South American Earth Sciences, 96:102312. https://doi.org/10.1016/j.jsames.2019.102312
https://doi.org/10.1016/j.jsames.2019.10... . The Patos shear zones divide the province into the Central and Northern domains, the latter comprising the Caicó-Seridó (CS), Jaguaribeano (J) and Ceará Central (CC) subdomains.

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Figure 3
(A) Banded gneiss of the Granjeiro Complex that consists of alternating dark dioritic and light granitic layers (LM33). (B) Migmatite including folded granitic leucosomes hosted in a gray granitic mesossome with biotite and hornblende (COR2). (C) Asymmetric boudinaged leucosomes in diatexite indicating dextral shear movement (CIPA). (D) Amphibolite clot invaded by granitic leucosomes, both enclosed in a gray mesosome of granitic composition (CAJ3) (see for location).

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Figure 4
Patos shear zone showing the distributions of Archean, Siderian and Rhyacian rocks and the samples collected in this study. Stars: published ages after Silva et al. (1997)Silva L.C., McNaughton N.J., Vasconcelos A.M., Gomes J.R.C, Fletcher L.R. 1997. U-Pb SHRIMP ages in the Southern State of Ceará, Borborema Province, NE Brazil: Archean TTG accretion and Proterozoic crustal reworking. In: International Symposium on Granites and Associated Mineralizations, 2., 1997. Annals…, p. 280-281., Bautista (2012)Bautista J.M.R. 2012. Estudo de proveniência sedimentar de sequências neoproterozoicas ao longo do Lineamento Patos (Província Borborema, NE Brasil). Dissertation, Instituto de Geociências, Universidade de São Paulo, São Paulo, 62 p. and Hollanda et al. (2015)Hollanda M.H.B.M., Archanjo C.J., Bautista J.R., Souza L.C. 2015. Detrital zircon ages and Nd isotope compositions of the Seridó and Lavras da Mangabeira basins (Borborema Province, NE Brazil): Evidence for exhumation and recycling associated with a major shift in sedimentary provenance. Precambrian Research, 258:186-207. https://doi.org/10.1016/j.precamres.2014.12.009
https://doi.org/10.1016/j.precamres.2014... (see text).

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Figure 5
Archean zircon U-Pb ages of the Granjeiro Complex (see ) for further details/location.

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Figure 6
(A, B, C) Siderian and (D, E) Rhyacian zircon U-Pb ages of high-grade rocks in the Patos shear zone (see text for details).

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Figure 7
Cathodoluminescence image of zircons with corresponding ages (Ma) of migmatites from the (A) central and (B, C) Western branches of the Patos shear zone.

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Figure 8
Average ²⁰⁶Pb/²³⁸U zircon ages of migmatites from the Western branch of the Patos shear zone.

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Figure 9
Argon-release age spectra for amphibole (top) and biotite from migmatites of the Western branch of the Patos shear zone. Bars are representative of 2σ errors (see text for details).

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Figure 10
Schematic reconstruction of the tectonic setting of the West Gondwana in the 580 – 550 Ma interval. Collisional sutures (inferred when dashed) assembled the West African, Amazonian and São Francisco-Congo cratons at ca. 600 Ma (collisional stage I after Ganade de Araújo et al. 2013Ganade de Araújo C.E., Weinberg R., Cordani U.G. 2013. Extruding the Borborema Province (NE-Brazil): a two-stage Neoproterozoic collision process. Terra Nova, 26(2):157-168. https://doi.org/10.1111/ter.12084
https://doi.org/10.1111/ter.12084... ), and the ongoing convergence between São Francisco-Congo and Amazonian cratons extruding the Borborema through strike-slip shear zones. Further South (today geographic coordinates), late collisions of the Rio de la Plata-Paranapanema (RP) and Kalahari cratons (Goscombe et al. 2017Goscombe B., Foster D., Gray D., Wade B., Mersellos A., Titus J. 2017. Deformation correlations, stress field switches and evolution of an orogenic intersection: The Pan-African Kaoko-Damara orogenic junction, Namibia. Geoscience Frontiers, 8(6):1187-1232. https://doi.org/10.1016/j.gsf.2017.05.001
https://doi.org/10.1016/j.gsf.2017.05.00... ) close the assembly of the West Gondwana. The left-lateral displacement of Okahandja Lineament (OL, Downing and Coward 1981Downing K., Coward M.P. 1981. The Okahandja Lineament and its significance for Damara tectonics in Namibia. Geologische Rundschau, 70:972-1000. https://doi.org/10.1007/BF01820175
https://doi.org/10.1007/BF01820175... ) in the Damara belt is consistent with the westward movement of the São-Francisco-Congo craton (see text).

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Table 1
Sm-Nd isotope data for gneisses and migmatites of the Archean and Siderian age.

Sample	rock	Coordinates UTM^* * Datum: Córrego Alegre. 24M		Sm (ppm)	Nd (ppm)	147Sm/144Nd	Error	143Nd/144Nd	Error	Nd (t=0)	Age¹ 1 Nd(t) values calculated from U-Pb zircon ages quoted in this study and, (A) Hollanda et al. (2011, 2015), (B) Bautista (2012), (C) Ferreira et al. (2019). See text for abbreviation of the studied samples; (Ga)	Nd (t)	TDM model age (Ga)
Cor-1	migmatite	608018	9226122	11.205	62.818	0.1079	0.0006	0.511089	0.000006	-30.21	2.49	-1.77	2.84
Cor-2	migmatite	603517	9226828	3.065	20.659	0.0897	0.0005	0.510990	0.000007	-32.14	2.50	2.28	2.54
LM-10(a)	orthogneiss	500123	9259584	8.077	51.175	0.0954	0.0006	0.510803	0.000006	-35.79	2.79	0.59	2.92
LM-30	banded gneiss	502627	9240544	14.651	76.861	0.1153	0.0007	0.511005	0.000007	-31.86	2.77	2.77	3.21
LM-33	banded gneiss	489939	9251470	13.056	58.648	0.1346	0.0008	0.511604	0.000007	-20.17	2.51	2.51	2.81
CAJ-03	migmatite	546373	9234170	27.070	127.976	0.1279	0.0008	0.511619	0.000006	-19.89	2.45	2.40	2.55
JMR-1-1(b)	biotite gneiss	508517	9253645	11.666	105.749	0.0667	0.0004	0.510503	0.000011	-41.65	2.35	2.35	2.65
JMR-1-2(b)	biotite gneiss	508517	9253645	5.816	36.156	0.0973	0.0006	0.510991	0.000015	-32.13	2.35	2.35	2.71
A-41(c)	orthogneiss	n.a		3.898	17.469	0.1349	n.a	0.511425	n.a	-23.13	2.45	-3.53	3.10
SL9(a)	banded gneiss	742680	9229990	13.469	106.526	0.0764	0.0005	0.510715	0.000012	-37.61	2.40	-0.39	2.60

[1] *Corresponding author.

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Late Ediacaran lateral-escape tectonics as recorded by the Patos shear zone (Borborema Province, NE Brazil)

Abstract