Rb-Sr Geochronology and Geochemical Characteristics of Mafic Dikes in the Nova Lacerda and Conquista DOeste Region, Mato Grosso, SW Amazonian Craton

Authors

  • Paulo César Corrêa da Costa Grupo de Pesquisas em Evolução Crustal e Metalogenia GUAPORÉ
  • Vicente Antonio Vitório Girardi Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • João Batista de Matos Grupo de Pesquisas em Evolução Crustal e Metalogenia GUAPORÉ
  • Amarildo Salina Ruiz Grupo de Pesquisas em Evolução Crustal e Metalogenia GUAPORÉ

DOI:

https://doi.org/10.5327/Z1519-874X2009000100008

Keywords:

Mafic dikes, Geochemistry, Geochronology, Amazonian Craton

Abstract

In the Nova Lacerda and Conquista DOeste regions, Mato Grosso State, SW part of the Amazonian Craton, mafic dikes trending NNW intrude the Nova Lacerda Granite (1462 ± 12 Ma), within the Jauru Domain, in the Rondonia-San Ignacio Province (1.55 - 1.3 Ga). The mafic swarm comprises diabases, metadiabases and amphibolites. Metadiabases originated from uralitization of diabases. These rocks have tholeiitic affinity and predominant basaltic composition. Some samples are andesi-basalts. The ages of diabases and metabasites are 1380 ± 32 Ma and 1330 ± 120 Ma respectively. Geochemical data indicate that the compositional variation of diabases and metadiadases is due to fractional crystallization of evolved tholeiitic magmas. The origin of the basaltic magmas is related to a heterogeneous mantle source

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Published

2009-01-01

Issue

Vol. 9 No. 1 (2009)

Section

Articles

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How to Cite

Costa, P. C. C. da, Girardi, V. A. V., Matos, J. B. de, & Ruiz, A. S. (2009). Rb-Sr Geochronology and Geochemical Characteristics of Mafic Dikes in the Nova Lacerda and Conquista D’Oeste Region, Mato Grosso, SW Amazonian Craton . Geologia USP. Série Científica, 9(1), 115-132. https://doi.org/10.5327/Z1519-874X2009000100008