Enriched mantle - Dupal signature in the genesis of the Jurassic Ferrar tholeiites from Prince Albert Mountains (Victoria Land, Antarctica)

Article Abstract:

An analysis of trace element abundances and Sr-Nd-Pb isotopic compositions was conducted for andesitic sills and andesitic basalt and lavas of the Jurassic Ferrar Magmatic Province, Antarctica and Prince Albert Mountains. The objective was to prove that the primary Ferrar basalts were not obtained from a depleted source mantle but may instead be obtained from an enriched mantle with Dupal isotopic signature. A petrological model is proposed whereby Ferrar magmas were produced through high degrees of melting of an E-type MORB.

Antarctic regions, Jurassic period

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Petrological and Sr-Nd evidence bearing on early Proterozoic magmatic events of the subcontinental mantle: Sao Francisco craton (Uaua, NE-Brazil)

Article Abstract:

Petrological and isotopic reconstruction of magmatic events of the subcontinental mantle shows that early Proterozoic, unmetamorphosed mafic dykes intrude into Archean regions of the Sao Francisco craton, Uaua region, northeastern Brazil. The dykes contain quartz tholeiites with varying compositions. Contamination of the dykes by crustal granitic components is indicated from Sr-Nd isotopes and geochemistry. A detailed chemical analysis of the dykes is given.

Usage, Observations, Isotopes, Cratons, Proterozoic Eon, Analytic geochemistry

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Basalt magmatism along the passive continental margin of SE Brazil (Campos basin)

Article Abstract:

Tholeiitic magmatism is present along the passive Southeastern Brazil continental margin. The magmatism is particularly highlighted in the Campos basin which fronts the Parana basin's inland flood basalts. Various mineralogical factors have made the Campos basalts undergo seawater interaction which enriched its MgO, FeO total, K2O, Rb and Ba. Such factors have also depleted SiO2 and CaO and allowed constant levels of Zr, Nb, Y and rapid earth elements.

Continental margins, Campos Basin

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