Figure 1:
Integrated simplified geological map of the Veríssimo-Miguelópolis and Uberaba sheets (Ferreira et al. and Seer & Moraes, in press), produced within the Triângulo Mineiro mapping project CODEMIG/UFMG 2015-17. Scintillometric transects A-B and C-D and the location of samples collected for whole-rock geochemistry (red stars) are also shown.
Figure 2:
Field aspects of rocks from the Uberaba Formation: (A) red fine sandstone bed (below) in contact with green lithic green sandstone (above); (B) bone fossils (probably titanosaur ribs) found in excavation in the Uberaba town; (C) cross stratifications in likely channel deposits. Hammer is 42 cm long.
Figure 3:
Lithostratigraphic chart of the Bauru basin, from Fernandes and Coimbra (2000Fernandes L.A., & Coimbra A.M. 2000. Revisão Estratigráfica da Parte Oriental da Bacia Bauru (Neocretáceo). Revista Brasileira de Geociências, 30(4):717-728.).
Figure 4:
Geophysical maps of the Veríssimo-Miguelópolis and Uberaba sheets (data from CODEMIG, Geophysic Airborne Program 2010/2011): (A) gamma spectrometry, ternary plot Th-U-K; (B) gamma spectrometry, Th channel; (C) gamma spectrometry, U channel.
Figure 5:
Ternary gamma spectrometric map of the eastern portion of the TM and AP regions, showing the outcrop areas of the Uberaba Formation and Mata da Corda Group (data from the Geophysics Airborne Program of CPRM/CODEMIG, 2006, Area 7).
Figure 6:
Stratigraphic column MP01.
Figure 7:
Stratigraphic column MP02.
Figure 8:
Stratigraphic column FU464.
Figure 9:
Photomicrographies of sandstones from the Uberaba Formation: (A and B) detail of quartz grains of probable volcanic origin, showing corrosion gulfs (Qz), uncrossed polarizers; (C) quartzite fragment (Qz) and carbonatic cement (Cb), crossed polarizers; (D) fragment of muscovite schist (MS) and clinopyroxene (Cpx), crossed polarizers; (E) clinopyroxene (Cpx), crossed polarizers; (F) perovskite (Prv) and melanite (Me), uncrossed polarizers.
Figure 10:
Whole rock geochemistry plots for samples of the Uberaba Formation: (A) trace elements, chondrite-normalized after Thompson (1982Thompson R.N. 1982. Magmatism of the British Tertiary Volcanic Province. Department of Geology, Imperial College of Science and Technology, London.); (B) REE, chondrite-normalized after Boynton (1984Boynton W.V. 1984. Cosmochemistry of the rare earth elements: meteoritic studies. In: Henderson, P. (ed.). Rare Earth Elements Geochemistry. Amsterdam: Elsevier, p. 63-114.); (C) REE, NASC-normalized after Taylor and McLennan (1995Taylor S.R., & McLennan S.M. 1995. The geochemical evolution of the continental crust. Reviews of Geophysics, 33:241-265.).
Figure 11:
Compared whole rock geochemistry of the Uberaba Formation (line graphics) and AP alkaline complexes: (A) trace elements and (B) REE, chondrite-normalized after Thompson (1982Thompson R.N. 1982. Magmatism of the British Tertiary Volcanic Province. Department of Geology, Imperial College of Science and Technology, London.) for the following alkaline complexes: Serra Negra (Grasso 2010Grasso C.B. 2010. Petrologia do complexo alcalino-carbonatítico de Serra Negra, MG. MS Dissertation - Instituto de Geociências, Universidade de Brasília, Brasília. 164 p.), Salitre (Barbosa 2009Barbosa E.S. R. 2009. Mineralogia e petrografia do complexo carbonatítico foscorítico de Salitre, MG. Tese - Instituto de Geociências, Universidade de Brasília, Brasília. 432p.) and Catalão I (Cordeiro et al. 2010Cordeiro P.F.O., Brod J.A., Dantas E.L., Barbosa E.S.R. 2010. Mineral Chemistry, Isotope Geochemistry and Petrogenesis of Niobium-Rich Rocks From The Catalão I Carbonatite-Phoscorite Complex, Central Brazil. Lithos, 118:223-237.); (C) trace elements and (D) REE, chondrite-normalized after Boynton (1984Boynton W.V. 1984. Cosmochemistry of the rare earth elements: meteoritic studies. In: Henderson, P. (ed.). Rare Earth Elements Geochemistry. Amsterdam: Elsevier, p. 63-114.) for the following alkaline complexes: Araxá (Traversa et al. 2000Traversa G., Gomes C.B., Brotzu P., Buraglini N., Morbidelli L., Principato S.R., Ruberti E. 2000. Petrography and Mineral Chemistry of Carbonatites and Mica-Rich Rocks From The Araxá Complex (Alto Paranaíba Province, Brazil). Anais da Academia Brasileira de Ciências, 73(1):71-98.) and Tapira (Brod et al. 2013Brod J.A., Junqueira-Brod T.C., Gaspar J.C., Petrinovic I.A., Valente S.C., Corval A. 2013. Decoupling of Paired Elements, Crossover REE Patterns, and Mirrored Spider Diagrams: Fingerprinting Liquid Immiscibility in The Tapira Alkaline Carbonatite Complex, SE Brazil. Journal of South American Earth Sciences, 41:41-56.).
Figure 12:
Geochemistry diagrams comparing the Uberaba Formation with AP alkaline complexes, in (A) SiO2 × MgO, (B) CaO × Al2O3, (C) TiO2 × SiO2 and (D) (Th/Yb)/(Ta/Yb).
Figure 13:
Geologic map of the AP (Alto Paranaíba). Adapted from Oliveira et al. (2004Oliveira I.W.B., Sachs L.L.B., Silva V.A., Batista I.H. 2004. Folha SE.23-Belo Horizonte. In: Schobbenhaus C., Gonçalves J.H., Santos J.O.S., Abram M.B., Leão Neto R., Matos G.M.M., Vidotti R.M., Ramos M.A.B., Jesus J.D.A. (Editors). Carta geológica do Brasil ao millionésimo: Sistema de Informações Geográficas - SIG e 46 folhas na escala 1: 1.000.000. Brasília: CPRM. 41 CD-ROM Pack.), with the locations of the alkaline complexes and the distribution of the Uberaba Formation.
Figure 14:
Mineral chemistry binary diagrams of garnets from Uberaba Formation comparing with garnets from alkaline complexes and from Romaria’s diamantiferous conglomerate (Tauá): (A) [Mg/(Mg+Fe)] × [Ca/(Ca+Mg)] diagram after Schulze (2003Schulze D.J. 2003. A Classification Scheme for Mantle-Derived Garnets in Kimberlite: A Tool for Investigating The Matle and Exploring for Diamonds. Lithos, 71:195-213.) separating mantle-affiliation and crust-affiliation garnets; (B) Mg/(Mg+Fe) × Cr2O3 diagram after Schulze (2003Schulze D.J. 2003. A Classification Scheme for Mantle-Derived Garnets in Kimberlite: A Tool for Investigating The Matle and Exploring for Diamonds. Lithos, 71:195-213.) classifying garnet’s evolutionary trends and (C) CaO × Cr2O3 diagram after Grütter et al. (2004Grütter H.S., Gurney J.J., Menzies A.H., Winter F. 2004. An updated classification scheme for mantle-derived garnet, for use by diamond explorers. Lithos, 77:841-857.) classifying garnet’s provenance, H: harzburgite, L: lherzolite, W: werhlite and E: eclogite). Salitre mineral chemistry analysis from Barbosa (2009Barbosa E.S. R. 2009. Mineralogia e petrografia do complexo carbonatítico foscorítico de Salitre, MG. Tese - Instituto de Geociências, Universidade de Brasília, Brasília. 432p.), Tapira from Brod et al. (2013Brod J.A., Junqueira-Brod T.C., Gaspar J.C., Petrinovic I.A., Valente S.C., Corval A. 2013. Decoupling of Paired Elements, Crossover REE Patterns, and Mirrored Spider Diagrams: Fingerprinting Liquid Immiscibility in The Tapira Alkaline Carbonatite Complex, SE Brazil. Journal of South American Earth Sciences, 41:41-56.) and Romaria from Coelho (2010Coelho F.M. 2010. Aspectos geológicos e mineralógicos da Mina de diamantes de Romaria, Minas Gerais. MS Dissertation, Universidade de São Paulo, São Paulo. 106p.).
Figure 15:
Mineral chemistry binary and ternary diagrams of phlogopites from the Uberaba Formation compared to phlogopites from some alkaline complexes of the AP: (A) Mg × Fe × Ca ternary diagram of micas classification; binary diagrams comparing phlogopites chemistry according to (B) Fe × Mg, (C) Al2O3 × TiO2 e (D) Ti × [Fe/(Fe+Mg)].
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