The Basal Conglomerate of the Capacete Formation (Mata da Corda Group) and its Relation to Diamond Distributions in Coromandel, Minas Gerais State, Brazil

Fernandes, Augusto Fonseca; Karfunkel, Joachim; Hoover, Donald B.; Sgarbi, Patricia Barbosa de Albuquerque; Sgarbi, Geraldo Norberto Chaves; Oliveira, Gustavo Diniz; Gomes, Joanna Correia de Souza Pereira; Kambrock, Klaus

doi:10.5327/z2317-4889201400010008

Cited by 5 publications

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“…More recent work has contributed significantly to the knowledge of the post-Gondwana stratigraphy in Alto Paranaíba (Sgarbi et al 2001;Fernandes et al 2014;Karfunkel et al 2014). In addition to confirming the presence of diamond in the basal conglomerate of the Capacete Formation, the description of diamonds recovered in the Canastrel digging, extracted directly from the conglomerate , sheds light on the fact that the components of this formation constitute the secondary source of diamonds extracted in the alluvium of the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers.…”

Section: Resultsmentioning

confidence: 99%

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

Pereira¹,

Fuck

França³

et al. 2017

Braz. J. Geol.

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Magmatism associated with the Alto Paranaíba structural high comprises kimberlites, kamafugites, and alkaline complexes, forming an approximately 400 x 150 km NW-SE belt in the southern São Francisco Craton. Dating of some intrusions reveals ages between 120 and 75 Ma. Chemical analyses of garnet recovered in alluvium from traditional diamond digging areas indicate peridotitic garnet windows in Três Ranchos and Coromandel. Six hundred and eighty (680) diamonds acquired or recovered during mineral exploration in the digging areas of Romaria, Estrela do Sul, Três Ranchos and Coromandel show unique characteristics, certain populations indicating young, proximal and primary sources (YPP). Analyses of 201 stones from Santo Antônio do Bonito, Santo Inácio and Douradinho rivers alluvium, Coromandel, present no evidence of transport, characterizing a proximal source. Within these river basins, exposures of the Late Cretaceous Capacete Formation basal conglomerate contain mainly small rounded and/or angular quartzite pebbles and of basic and ultrabasic rocks, as well as kimberlite minerals (garnet, ilmenite, spinel, sometimes diamond). A magnetotelluric profile between the Paraná and Sanfranciscana basins shows that the thick underlying lithosphere in the Coromandel region coincides with the peridotitic garnet window and with a diamond population displaying proximal source characteristics. Diamond-bearing kimberlite intrusions occur in different areas of Alto Paranaíba. KEYWORDS

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Section: Resultsmentioning

confidence: 99%

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

Pereira¹,

Fuck

França³

et al. 2017

Braz. J. Geol.

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show abstract

“…O Cretáceo Superior no oeste de Minas Gerais é marcado por derrames kamafugíticos, piroclásticas e sedimentos epiclásticos (Sgarbi et al, 2001 (Sgarbi et al, 2001;Fernandes et al, 2014).…”

Section: Província Alcalina Do Alto Paranaíba (Paap)unclassified

Os distintos tipos petrográficos da intrusão Kimberlítica Pântano, Província Alcalina Alto Paranaíba (MG): evidências de um sistema magmático aberto

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Primary source of alluvial diamonds from the Santo Antônio do Bonito, Santo Inácio, and Douradinho rivers, Coromandel region, Minas Gerais, Brazil

Pereira¹,

Carvalho

Fuck

2021

Journal of South American Earth Sciences

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The Basal Conglomerate of the Capacete Formation (Mata da Corda Group) and its Relation to Diamond Distributions in Coromandel, Minas Gerais State, Brazil

Cited by 5 publications

References 0 publications

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

Evidence of young, proximal and primary (YPP) diamond source occurring in alluviums in the Santo Antônio do Bonito, Santo Inácio and Douradinho rivers in Coromandel region, Minas Gerais

Os distintos tipos petrográficos da intrusão Kimberlítica Pântano, Província Alcalina Alto Paranaíba (MG): evidências de um sistema magmático aberto

Primary source of alluvial diamonds from the Santo Antônio do Bonito, Santo Inácio, and Douradinho rivers, Coromandel region, Minas Gerais, Brazil

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