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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Agpaitic Alkaline Rocks in Southern Brazilian Platform: A Review

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Author(s):
Gomes, Celso de Barros [1] ; Azzone, Rogerio Guitarrari [1] ; Rojas, Gaston Eduardo Enrich [1] ; Guarino, Vincenza [2] ; Ruberti, Excelso [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Geosci, BR-05508080 Sao Paulo - Brazil
[2] Univ Napoli Federico II, Dipartimento Sci Terra Ambiente & Risorse, I-80126 Naples - Italy
Total Affiliations: 2
Document type: Review article
Source: MINERALS; v. 11, n. 9 SEP 2021.
Web of Science Citations: 0
Abstract

General information is presented on ten agpaitic occurrences located in southern Brazil and at the border between Brazil and Paraguay. All the Brazilian agpaitic rocks are Late Cretaceous in age, whereas the Paraguayan ones are older than Early Triassic. The most significant occurrence is Pocos de Caldas, the largest alkaline massif in South America. In general, these agpaitic rocks contain mineral assemblages that indicate presence of typical halogen-bearing Na-Ca-HFSE phases, eudialyte-, rinkite- and wohlerite-group minerals being the most frequent ones. However, these associations are indeed more complex in terms of composition, with accessory phases in some cases consisting of various minerals, including U-Th oxides/silicates, Nb oxides, REE-Sr-Ba bearing carbonates-fluorocarbonates-phosphates-silicates and Zr-Na rich silicates. They usually form late magmatic stage to hydrothermal/deuteric assemblages linked with coarse and fine-grained, mainly silica-undersaturated evolved rocks. Data also indicate significant differences in type, amount and composition of agpaitic minerals in all investigated occurrences. (AU)

FAPESP's process: 19/13174-3 - General aspects of the alkaline magmatism in Southern Brazilian platform
Grantee:Celso de Barros Gomes
Support Opportunities: Regular Research Grants
FAPESP's process: 19/22084-8 - The Paraná Magmatic Province: petrogenesis, chronology and environmental impact of Cretaceous tholeiitic, alkaline and silicic magmatism in the Brazilian Platform
Grantee:Valdecir de Assis Janasi
Support Opportunities: Research Projects - Thematic Grants