Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

BRAZIL

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Summary: 

With over 100 complexes, more than 20 of which include carbonatite, Brazil is notably well endowed with alkaline rocks. Vast areas, particularly in the Amazon Basin, are not yet thoroughly explored or are obscured by a thick lateritic cover, so that further occurrences are certain to be found. Many intrusions have been exploited economically, particularly those with carbonatite, making Brazil the world's foremost producer of Nb and a major producer of phosphate, vermiculite and rare earths. A very full review of Brazilian alkaline rocks and carbonatites has been given by Ulbrich and Gomes (1981) and J. G. Valenca has written an unpublished review paper. Rodrigues and Lima (1984) give a brief account of the carbonatites of Brazil and have tabulated the main features of 21 intrusions; they also list all occurrences of alkaline rocks, including circular structures, detected from the air, which may prove to be alkaline intrusions. Particularly useful compilations for the Rio de Janeiro-Sao Paulo area are to be found in Lima (1976) and Liu et al. (1976). Herz (1977 and 1978) has reviewed the ages of the alkaline rocks of southern Brazil and related them to associated basaltic volcanism, the opening of the Atlantic Ocean, and movement of the South American Plate. Asmus (1978) lists the ages of many alkaline complexes and discusses them in terms of oceanic and continental fracture systems, while the plate tectonic setting of alkaline igneous occurrences south of latitude 15°S are discussed by Almeida (1983). Numerous ages are given by Amaral et al. (1966).

Figure no: 
Fig. 192. Distribution of alkaline igneous rocks and carbonatites in Brazil.
Image: 
Occurrences: 

025-00-001  Seis Lagos
025-00-002  Marie Mirim
025-00-003  Catrimani
025-00-004  Cachorro
025-00-005  Mutum
025-00-006  Erepeceru
025-00-007  Maicuru
025-00-008  Apupariu
025-00-009  Maraconai
025-00-010 Mapari
025-00-011 Boca Nova
025-00-012 Sucunduri Dome
025-00-013 Canama
025-00-014 Guariba
025-00-015 Rondonianas granites
025-00-016 Teotonio
025-00-017 Porto Nacional
025-00-018 Circular structure
025-00-019 Circular structure
025-00-020 Circular structure
025-00-021 Circular structure
025-00-022 Circular structure
025-00-023 Circular structure
025-00-024 Circular structure
025-00-025 Circular structure
025-00-026 Circular structure
025-00-027 Circular structure
025-00-028 Circular structure
025-00-029 Circular structure
025-00-030 Circular structure
025-00-031 Parambu
025-00-032 Fortaleza area
025-00-033 Catingueiras
025-00-034 Cabo de Santo Agostinho
025-00-035 Itapitanga
025-00-036 Itabuna
025-00-037 Santa Cruz da Vitoria
025-00-038 Fazenda Hiassu
025-00-039 Potiragua
025-00-040 Itarantim
025-00-041 Peixe
025-00-042 Morro do Engenho
025-00-043 Santa Fe
025-00-044 Caiapo
025-00-045 Montes Claros de Goias
025-00-046 Lambari, Fazenda do Toninho, Papira and Diorama
025-00-047 Arenopolis
025-00-048 Corrego dos Bois
025-00-049 Buriti and Mata Azul
025-00-050 Santa Marta II
025-00-051 Morro do Macaco
025-00-052 Amorinopolis
025-00-053 Agua Emendada
025-00-054 Santo Antonio da Barra
025-00-055 Catalao II
025-00-056 Catalao I
025-00-057 Coromandel
025-00-058 Pantano
025-00-059 Patos de Minas
025-00-060 Morro das Broas
025-00-061 Serra Negra
025-00-062 Salitre
025-00-063 Sao Gotardo
025-00-064 Serra do Bueno
025-00-065 Bambui
025-00-066 Araxa
025-00-067 Tapira
025-00-068 Sacramento
025-00-069 Jaboticabal
025-00-070 Pao de Acucar
025-00-071 Ubari
025-00-072 Morro de Sao Joao
025-00-073 Cabo Frio and Morro do Forno
025-00-074 Guapiacu
025-00-075 Saorinho
025-00-076 Rio Bonito
025-00-077 Tangua
025-00-078 Porto das Caixas
025-00-079 Monjolos
025-00-080 Itauna
025-00-081 Maua
025-00-082 Canaa
025-00-083 Tingua
025-00-084 Marapicu-Mendanha
025-00-085 Barra do Pirai and Dos Tomazos
025-00-086 Volta Redonda
025-00-087 Morro Redondo
025-00-088 Itatiaia
025-00-089 Passa Quatro
025-00-090 Pocos de Caldas
025-00-091 Campos do Jordao
025-00-092 Ilha da Vitoria
025-00-093 Ilha dos Buzios
025-00-094 Ilha de Sao Sebastiao
025-00-095 Ilha do Monte de Trigo
025-00-096 Itanhaem
025-00-097 Piedade
025-00-098 Ipanema
025-00-099 Tatui
025-00-100  Juquia
025-00-101  Banhadao
025-00-102  Barra do Teixeira and Sete Quedas
025-00-103  Itapirapua
025-00-104  Barra do Itapirapua
025-00-105  Mato Preto
025-00-106  Cerro Azul
025-00-107  Tunas
025-00-108  Bairro da Cruz
025-00-109  Jacupiranga
025-00-110  Cananeia
025-00-111  Vargeao
025-00-112  Lages
025-00-113  Anitapolis
025-00-114  Estiva
025-00-115  Piratini
025-00-116  Cerro Jarau

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith