Felsic volcanic rocks from Azinhalinho, Beja, Portugal: relationship with Iberian Pyrite Belt magmatism.

Diogo Raeymaekers Namorado Rosa, Carlos M.C. Inverno, Vítor M.J. Oliveira

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review


The Azinhalinho volcanic rocks are hosted in the Frasnian Gafo Formation and display very similar geochemical signatures to some volcanic rocks from the Iberian Pyrite Belt (IPB),
namely anomalously low HFSE concentrations, possibly caused by low temperature crustal melting, which translate into classification problems. Considering the lack of radiometric dates and clear field relationships, the similarity between the geochemistry of Azinhalinho volcanic rocks and IPB volcanic rocks can be explained in two possible ways. The Azinhalinho volcanic rocks can be considered the product of a volcanism that preceded the volcanism that occurred in the IPB, which is widely interpreted as being of late Famennian to Middle Visean age. In this case, the volcanism of Azinhalinho would have happened synchronously with the Late Devonian Phyllite-Quartzite Group sedimentation in the IPB basin, but already in a very similar setting to the one in which IPB volcanism would develop later. Alternatively or complementary, both volcanisms could have been approximately contemporaneous, in which case the volcanism of Azinhalinho would represent conduits or feeders to the volcanism of the IPB.
TitelProceedings of the 9th Biennial Meeting of the Society for Geology Applied to Mineral Deposits.
ForlagSociety for Geology Applied to Mineral Deposits (SGA)
Antal sider4
StatusUdgivet - 2007
Udgivet eksterntJa
BegivenhedNinth SGA Meeting: Digging Deeper - Dublin, Ireland
Varighed: 20 aug. 200723 aug. 2007


KonferenceNinth SGA Meeting: Digging Deeper
ByDublin, Ireland


  • Programområde 4: Mineralske råstoffer


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