Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil)
ABSTRACT: The campanian Uberaba Formation, which crops out around the homonymous town, is composed of greenish lithic sandstones and conglomerates with possible volcanoclastic contribution. In this unit, heavy minerals such as ilmenite, garnet, perovskite and magnetite, besides clinopyroxene, plagio...
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Sociedade Brasileira de Geologia
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| Series: | Brazilian Journal of Geology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200159&lng=en&tlng=en |
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| author | Dennis Arthuso Quintão Fabrício de Andrade Caxito Joachim Karfunkel Florence Rodrigues Vieira Hildor José Seer Lúcia Castanheira de Moraes Luiz Carlos Borges Ribeiro Antônio Carlos Pedrosa-Soares |
| author_facet | Dennis Arthuso Quintão Fabrício de Andrade Caxito Joachim Karfunkel Florence Rodrigues Vieira Hildor José Seer Lúcia Castanheira de Moraes Luiz Carlos Borges Ribeiro Antônio Carlos Pedrosa-Soares |
| author_sort | Dennis Arthuso Quintão |
| collection | DOAJ |
| description | ABSTRACT: The campanian Uberaba Formation, which crops out around the homonymous town, is composed of greenish lithic sandstones and conglomerates with possible volcanoclastic contribution. In this unit, heavy minerals such as ilmenite, garnet, perovskite and magnetite, besides clinopyroxene, plagioclase, quartz, calcite and apatite, are found. The Uberaba Formation geochemistry is marked by high grades of Ba, Ta, La, Nb and Th, with flat (no Eu anomaly) and highly fractionated (LaN/YbN = ca. 128) chondrite-normalized rare earth elements. Mineral chemistry analyses of detrital garnets from the Uberaba Formation indicate the predominance of chorlomite with an affinity to crustal garnets (G3). The sedimentary provenance of the Uberaba Formation corresponds to a mixing of materials from the alkaline districts of the Alto Paranaíba and from the erosion of the Serra Geral Formation and the Canastra and Araxá groups. Diamond-producing conglomerates which crop out nearby, in Romaria, were considered by some authors as correlated to the Uberaba Formation. However, the composition of garnets recovered from those conglomerates is different, plotting in the field of mantle garnets (G9/G10). We consider, then, that those units are not correlated, and that the Uberaba Formation is not a possible source for the alluvial diamonds found in the homonymous river. |
| first_indexed | 2024-12-13T10:57:09Z |
| format | Article |
| id | doaj.art-0fd1d904926b4275bd435f259726cd07 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-13T10:57:09Z |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-0fd1d904926b4275bd435f259726cd072022-12-21T23:49:27ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-469247215918210.1590/2317-4889201720170032S2317-48892017000200159Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil)Dennis Arthuso QuintãoFabrício de Andrade CaxitoJoachim KarfunkelFlorence Rodrigues VieiraHildor José SeerLúcia Castanheira de MoraesLuiz Carlos Borges RibeiroAntônio Carlos Pedrosa-SoaresABSTRACT: The campanian Uberaba Formation, which crops out around the homonymous town, is composed of greenish lithic sandstones and conglomerates with possible volcanoclastic contribution. In this unit, heavy minerals such as ilmenite, garnet, perovskite and magnetite, besides clinopyroxene, plagioclase, quartz, calcite and apatite, are found. The Uberaba Formation geochemistry is marked by high grades of Ba, Ta, La, Nb and Th, with flat (no Eu anomaly) and highly fractionated (LaN/YbN = ca. 128) chondrite-normalized rare earth elements. Mineral chemistry analyses of detrital garnets from the Uberaba Formation indicate the predominance of chorlomite with an affinity to crustal garnets (G3). The sedimentary provenance of the Uberaba Formation corresponds to a mixing of materials from the alkaline districts of the Alto Paranaíba and from the erosion of the Serra Geral Formation and the Canastra and Araxá groups. Diamond-producing conglomerates which crop out nearby, in Romaria, were considered by some authors as correlated to the Uberaba Formation. However, the composition of garnets recovered from those conglomerates is different, plotting in the field of mantle garnets (G9/G10). We consider, then, that those units are not correlated, and that the Uberaba Formation is not a possible source for the alluvial diamonds found in the homonymous river.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200159&lng=en&tlng=enUberaba FormationAlkaline magmatismTriângulo MineiroProvenanceUpper Cretaceous |
| spellingShingle | Dennis Arthuso Quintão Fabrício de Andrade Caxito Joachim Karfunkel Florence Rodrigues Vieira Hildor José Seer Lúcia Castanheira de Moraes Luiz Carlos Borges Ribeiro Antônio Carlos Pedrosa-Soares Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) Brazilian Journal of Geology Uberaba Formation Alkaline magmatism Triângulo Mineiro Provenance Upper Cretaceous |
| title | Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) |
| title_full | Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) |
| title_fullStr | Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) |
| title_full_unstemmed | Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) |
| title_short | Geochemistry and sedimentary provenance of the Upper Cretaceous Uberaba Formation (Southeastern Triângulo Mineiro, MG, Brazil) |
| title_sort | geochemistry and sedimentary provenance of the upper cretaceous uberaba formation southeastern triangulo mineiro mg brazil |
| topic | Uberaba Formation Alkaline magmatism Triângulo Mineiro Provenance Upper Cretaceous |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200159&lng=en&tlng=en |
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