SiO<sub>2</sub>-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Valério, Cristóvão da Silva; Macambira, Moacir José Buenano; Souza, Valmir da Silva; Dantas, Elton Luiz

doi:10.1590/2317-4889201720170044

Cristóvão da Silva Valério ^**Corresponding author

Adjunct Professor, Instituto de Geociências, Universidade Federal de Roraima - UFRR, Boa Vista (RR), Brazil. E-mail: cristovao.valerio@ufrr.br

Moacir José Buenano Macambira

Full Professor, Laboratório de Geologia Isotópica, Instituto de Geociências, Universidade Federal do Pará - UFPA, Belém (PA), Brazil. E-mail: moamac@ufpa.br

Valmir da Silva Souza

Associate Professor, Instituto de Geociências, Universidade de Brasília - UnB, Brasília (DF), Brazil. E-mail: vsouza@unb.br, elton@unb.br

Elton Luiz Dantas

Associate Professor, Instituto de Geociências, Universidade de Brasília - UnB, Brasília (DF), Brazil. E-mail: vsouza@unb.br, elton@unb.br

*Corresponding author

Figures (4)
Tables (1)

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Figure 1:
(A) Geochronological provinces of the Amazonian craton (Macambira et al. 2009Macambira M.J.B., Vasquez M.L., Silva D.C.C., Galarza M.A., Barros C.E.M., Camelo J.F. 2009. Crustal growth of the central-eastern Paleoproterozoic domain, SE Amazonian craton: Juvenile accretion vs. reworking. Journal of South American Earth Sciences, 27(4):235-246.). (B) Simplified geological map of the central Amazonian Craton, NE Amazonas State, central part of Ventuari-Tapajós and Western Central Amazonian provinces (in Valério et al. 2012Valério C.S., Macambira M.J.B, Souza V.S. 2012. Field and petrographic data of 1.90-1.88 Ga I- and A-type granitoids from the central Amazonian Craton, NE Amazonas State, Brazil. Revista Brasileira de Geociências, 42(4):690-712., updated). (C) Geological map of the Southernmost Uatumã-Anauá Domain, central Amazonian craton. The compositional variation of granitoid and volcanic rocks and main fault zones has been obtained from integration of geological, petrography, geochemical, SAR/SIPAM remote sensing products and airborne geophysical data.

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Figure 2:
Geochemical classification plots. (A) R1-R2 plot (De la Roche et al. 1980De la Roche H., Leterrier J., Grandclaude P., Marchal M. 1980. A classification of volcanic and plutonic rocks using R1,R2-diagram and major-element analyses - Its relationships with current nomenclature. Chemical Geology, 29(1-4):183-210). (B) TAS plot (Cox et al. 1979Cox K.G., Bell J.D., Pankhurst R.J. 1979. The interpretation of igneous rocks. Boston, George Allen and Unwin London.). (C) On the A/CNK-A/NK plot (Shand 1943Shand S.J. 1943. The eruptive rocks. 2nd edition, John Wiley, New York, 444 p.). (D) SiO₂ wt.% versus K₂O wt.% plot (Peccerrilo & Taylor 1976Peccerilo A., Taylor S.R. 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contributions to Mineralogy and Petrology, 58(1):63-81.). Tectonic setting plots by Pearce et al. (1984Pearce J.A., Harris N.B.W., Tindle A.G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4):956-983.), Y-Nb (E) and Yb-Ta (F) plots; see field descriptions in Pearce et al. (1984Pearce J.A., Harris N.B.W., Tindle A.G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4):956-983.).

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Figure 3:
Discordia plot showing the upper intercept at 1872 Ma, crystallization age for hornblende quartz monzonite (CC-42) of the Castanhal Quartz Monzonite, Mapuera Suite.

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Figure 4:
εHft versus age diagram for 10 zircon crystals from the hornblende quartz monzonite (CC-42) of the Castanhal Quartz Monzonite, Mapuera Suite. Mesoarchean to Neoarchean mafic crust sources and Neoarchean to later Siderian felsic crust sources.

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Table 1:
LA-MC-ICP-MS Lu-Hf analysis for sample CC-42 (hornblende quartz monzonite) of the Castanhal Quartz Monzonite, Mapuera Suite.

File Name	Sample/spot	U-Pb Age (Ma)	±2σ	CHUR	DM	Sample (present-day ratios)				Sample (initial ratios)			DM model ages (Ga)
				¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	¹⁷⁶ Hf/ ¹⁷⁷ Hf	±2SE	¹⁷⁶ Lu/ ¹⁷⁷ Hf	±2SE	¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	epsilon Hf (t)	±2SE	Mafic	Felsic
				¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	¹⁷⁶ Hf/ ¹⁷⁷ Hf	±2SE	¹⁷⁶ Lu/ ¹⁷⁷ Hf	±2SE	¹⁷⁶ Hf/ ¹⁷⁷ Hf (t)	epsilon Hf (t)	±2SE	source	source
01	003-Z2.static.exp	1874	9.9	0.281589	0.281868	0.281573	0.000030	0.001296	0.000177	0.281527	-2.2	0.3	2.95	2.51
02	004-Z5.static.exp	1887	8.0	0.281580	0.281858	0.281565	0.000029	0.000741	0.000008	0.281538	-1.5	0.0	2.90	2.48
03	005-Z6.static.exp	1862	7.6	0.281597	0.281878	0.281589	0.000014	0.000856	0.000015	0.281559	-1.3	0.0	2.87	2.45
04	006-Z7.static.exp	1871	8.4	0.281590	0.281870	0.281665	0.000052	0.001271	0.000089	0.281620	1.1	0.1	2.66	2.34
05	007-Z11.static.exp	1872	7.5	0.281590	0.281870	0.281593	0.000026	0.000816	0.000008	0.281564	-0.9	0.0	2.84	2.44
06	008-Z13.static.exp	1893	8.4	0.281576	0.281854	0.281581	0.000039	0.001223	0.000040	0.281537	-1.4	0.1	2.90	2.48
07	009-Z14.static.exp	1858	9.1	0.281599	0.281881	0.281614	0.000039	0.001159	0.000027	0.281573	-0.9	0.0	2.83	2.43
08	010-Z16.static.exp	1894	12.6	0.281576	0.281854	0.281595	0.000045	0.001414	0.000012	0.281544	-1.1	0.0	2.87	2.47
09	011-Z20.static.exp	1881	11.2	0.281584	0.281863	0.281606	0.000029	0.000777	0.000006	0.281578	-0.2	0.0	2.78	2.41
10	012-Z22.static.exp	1878	7.6	0.281586	0.281865	0.281594	0.000031	0.001300	0.000028	0.281548	-1.4	0.0	2.88	2.47

[1] *Corresponding author

Brasil

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SiO₂-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Magmatismo alcalino potássico saturado em SiO₂ na porção central do Cráton Amazônico, extremo sul do Domínio Uatumã-Anauá, NE do Amazonas, Brasil

ABSTRACT:

Brasil

Brasil

SiO2-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Magmatismo alcalino potássico saturado em SiO2 na porção central do Cráton Amazônico, extremo sul do Domínio Uatumã-Anauá, NE do Amazonas, Brasil

ABSTRACT:

SiO₂-saturated potassic alkaline magmatism in the central Amazonian Craton, southernmost Uatumã-Anauá Domain, NE Amazonas, Brazil

Magmatismo alcalino potássico saturado em SiO₂ na porção central do Cráton Amazônico, extremo sul do Domínio Uatumã-Anauá, NE do Amazonas, Brasil