CURRAL CIMA/ JACARAÚ-PB 35o/35º15' - 06º40' Fig. 5A |
Tonalites, quartz diorites (Epid.-bearing CA) |
Magmatic epidote |
Amphibole-rich cloths Remnants of oceanic crust |
I-type (VAG) + S- type Peraluminous Low εNd values |
618 ± 10 |
Ferreira et al. (2014Ferreira V.P., Valley J., Sial A.N., Pessoa R.J., Spicuzza M. 2014. Oceanic crust source-derived Tavares high-K Quartz Monozonite, Borborema Province, NE Brazil: geochemical and isotopic evidence. : Brazilian Geological Congress, 47., Salvador. Anais... Salvador: Núcleo Bahia da SBG, p.285.) Brito Neves et al. (2008Brito Neves B.B., Mantovani M.S.M., Moraes C.F., Sigolo J.B. 2008. As anomalias geológicas e geofísicas ao norte de Itapororoca (PB), folha Guarabira. Revista Brasileira de Geociências , 38(1):1-23.) |
CAMPINA GRANDE SERRA REDONDA-PB 35o36'/35o54' - 7o15' |
Composition ranging from monzodiorite, granodiorite to quartz monzonite + mafic facies of K-dioritic nature (Epid.-bearing HKCA) |
Enclaves within felsic rocks, products of mingling between coeval granitic and dioritic magmas. Mafic rocks with augite |
|
High-K calc-alkaline chemistry VAG Metaluminous |
581 ± 1.6 |
Almeida et al. (2002Almeida C.N., Guimarães I.P., Silva Filho A.F. 2002. Petrogênese de rochas plutônicas félsicas e máficas na Província Borborema, NE do Brasil: o complexo cálcio-alcalino de Alto-K de Campina Grande. Revista Brasileira de Geociências , 32:205-216.) |
EMAS-PB 37º45' - 7º10' Figs. 5B and 5C |
Fine-grained (equigranular) and porphyritic granodiorites (Epid.-bearing CA) |
Magmatic epidote, zoned plagioclase |
Amphibolites (with biotite and hornblende) Remnants of oceanic crust |
I-type (VAG) Metaluminous |
- |
Goist (1989Goist T.O. 1989. Petrology and geochemistry of the Emas pluton, Northeastern Brazil Master Dissertation, Universidade Federal de Pernambuco, Technological Center, 157p.) |
BREJINHO-PE 37o15' - 7o22' Figs. 5D and 5E |
Porphyritic monzogranitic/granodioritic rocks + quartz diorites (mostly as enclaves) (Epid.-bearing HKCA) |
Magmatic epidote, titanite |
Quartz diorites, diorites enclaves and dikes (see photo) |
I-type + (VAG), High-K calc- alkaline, metaluminous Low εNd values |
638 ± 15 |
Torres (2001Torres H.H.F. 2001. Petrologia e geoquímica do batólito cálcio-alcalino de alto-K de Brejinho, domínio da Zona Transversal, Província Borborema, NE do Brasil . Tese de Doutorado, Universidade de Pernambuco, 185p.) |
CONCEIÇÃO-PB 38º30' - 07º34' Figs. 5F and 5G |
K-diorites, tonalites, hornblende-biotite granodiorites (Epid.-bearing CA) |
Hornblende, biotite, magmatic epidote |
Quartz diorites, amphibolites |
I-type (VAG) High-K calc-alkalic. Meta- to peraluminous |
635 ± 9 |
Cunha (1994Cunha M.A.L. 1994. Petrologia, geoquimica e profundidade de posicionamento dos stocks granodioríticos-tonalíticos de Boa Ventura, Conceição e Pedra Branca, Paraíba, Nordeste do Brasil . Dissertação de Mestrado, Universidade Federal de Pernambuco, Technological Center, 160p.) Barriga (1983Barriga V.M.F. 1983. Petrologia e geoquímica das rochas plutônicas de Conceição-Itaporanga (PB) . Dissertação de Mestrado, Centro de Ciências Geofísicas e Geológicas, Universidade Federal do Pará, Belém, 146p) |
TAVARES-PB 37o54' - 7o36' Figs. 5H and 5I |
Syeno-granites, quartz syenites, monzogranites and quartz monzonites Epid.-bearing HKCA |
Magmatic epidote Syn-plutonic dykes Ladder dikes and snail structures |
Syn-plutonic dikes and magmatic enclaves of K- diorites Amphibolitic, remnants of oceanic crust |
I-type (VAG) High K calc-alkalic, metaluminous |
651 ± 15 |
Pessoa (2001Pessoa R.J.R. 2001. Mecanismos de alojamento e construção do batólito granítico neoproterozoico de Tavares, Estado da Paraíba - Nordeste do Brasil Tese de Doutorado, Centro de Tecnologia e Geociências, Universidade Federal de Pernambuco, Recife, 218p.) Brito Neves et al. (2008Brito Neves B.B., Mantovani M.S.M., Moraes C.F., Sigolo J.B. 2008. As anomalias geológicas e geofísicas ao norte de Itapororoca (PB), folha Guarabira. Revista Brasileira de Geociências , 38(1):1-23.) Ferreira et al. (2014Ferreira V.P., Valley J., Sial A.N., Pessoa R.J., Spicuzza M. 2014. Oceanic crust source-derived Tavares high-K Quartz Monozonite, Borborema Province, NE Brazil: geochemical and isotopic evidence. : Brazilian Geological Congress, 47., Salvador. Anais... Salvador: Núcleo Bahia da SBG, p.285.) |
ITAPORANGA -PB 38º09' - 7º16' Figs. 6A-6C |
Compositional gradation from K- diorite, monzodiorite, quartz monzonite, granodiorite to granite (interaction of K- diorites and granitic magmas) (Epid.-free HKCA) |
Hornblende and biotite. Usually porphyritic rocks K-feldspars up to 10cm ("migmatitic" features are common) |
(High-K) quartz diorites, with mingling and mixing features Evidences of successive mafic magma supplies |
High-K calc-alkaline (epidote free) granitoids Mostly VAG types (→WPG) |
584 ± 2 |
Mariano (1989Mariano G. 1989. Magma mixing origin of Potassic Calk-alkaline pluton: the Itaporanga Batholith, state of Paraíba, Northeastern Brazil Master dissertation, University of Georgia, Athens, 180p.) Mariano et al. (1990Mariano G., Sial A.N., Herz N. 1990. Oxygen isotope geochemistry of a potassic porphyritic calc-alkaline composite pluton: the Itaporanga Batholith, state of Paraíba, Northeastern Brazil.Revista Brasileira de Geociências, 20(1-4):159-164.) Mariano & Sial (1990Mariano G., Sial A.N. 1990. Coexistence and mixing of magmas in the late precambrian Itaporanga Batholith, State of Paraíba, Northeastern Brazil. Revista Brasileira de Geociências , 20:101-110.) Ferreira et al. (2004Ferreira V.P., Sial A.N., Pimentel M.M., Moura C.A.V. 2004. Intermediate to acidic magmatism and crustal evolution in the Transversal Zone, Northeastern Brazil. : Mantesso-Neto V., Bartorelli A., Carneiro C.D.R., Brito Neves B.B. (eds.). Geologia do Continente Sul-Americano - Evolução da Obra de Fernando Flávio Marques de Almeida. Beca, São Paulo, p.189-201.) |
SERRA DA LAGOINHA-PB 38º35' - 7º30' |
Porphyritic biotite- granites > hornblende-biotite granite Epid.-free HKCA |
Titanite, opaque minerals Perthites up to 5- cm long ("flame" > "patch") K-dioritic enclaves, sharp contacts Occasional mafic xenoliths |
K-dioritic enclaves, sharp contacts Occasional mafic xenoliths |
High-K calc- alkaline Na2O, K2O and TiO2-rich rocks |
|
Barriga (1983Barriga V.M.F. 1983. Petrologia e geoquímica das rochas plutônicas de Conceição-Itaporanga (PB) . Dissertação de Mestrado, Centro de Ciências Geofísicas e Geológicas, Universidade Federal do Pará, Belém, 146p) |
EXU-BODOCÓ-PE 39o30'/40o - 7º30' |
Porphyritic coarse- grained quartz monzonite, quartz monzodiorite (little variation in composition) "plumose" and "porphyritic" Epid.-free HKCA |
Perthitic K- feldspar up to 5- cm long. Calcic- amphiboles, allanite, clinopyroxene |
Many mafic enclaves. Some microgranitoid enclaves Mafic dikes with sharp contacts |
High-K calc-alkaline (~ Itaporanga) |
590 - 560* (Rb - Sr) |
McMurry (2001McMurry J. 2001. Crystal accumulation and shearing in a Megacryst Quartz Monzonite: Bodocó Pluton, Northeastern Brazil. Journal of Petrology , 42(2):251-276.) McMurry (1995McMurry J. 1995. Mesonorm-based rock names for the Bodocó Pluton, Northeastern Brazil, and other metaluminous megacrystic rocks. Anais da Academia Brasileira de Ciências , 67:289-300.) |
SERRITA-PE 39º-16' - 7º-54'/8º-00' |
Epidote-bearing and biotite granodiorites predominate in the cores of the stocks + rims of aegirine- granites (Epid.-bearing CA) |
Rims of aegirine granite are in topographic relief. Xenoliths of the enclosing rocks are rare |
Characteristic circular shapes Near the intrusive contacts, granitic sills following the schistosity of the enclosing rocks |
Biotite granodiorites exhibit trondhjemitic affinities and meta- to peraluminous character Aegirine-granites show peralkaline tendency |
- |
Neves (1986Neves S.P. 1986. Petrologia e geoquímica dos stocks graníticos de Serrita, Pernambuco. Revista Brasileira de Geociências , 16(1):86-94.) |
FELSIC DIKES AND SILLS Figs. 7A-7C |
Rhyolites, rhyodacites and dacites |
0.5 to 2.0-m thick, concordant to sub-concordant with the enclosing schists |
|
VAG, with trondhjemitic affinities |
650 - 630 |
Brito (2014Brito M.F.L. 2014. Metavulcânicas ácidas do Complexo Salgueiro: caracterização e comparação com aquelas do Complexo Riacho Gravatá e Grupo Cachoeirinha, Zona Transversal, Província Borborema, NE Brasil. : Congresso Brasileiro de Geologia, 47., Salvador. Anais.. . Salvador: SBG, p.121.) |