Geochemical studies in the drainage basin of the Rio Vouga (Portugal)
作者： H.Lo Ten Haven , Rudy Konings , Martin A.A. Schoonen , J.Ben H. Jansen , Simon P. Vriend
DOI: 10.1016/0009-2541(85)90134-2
关键词: Intrusion 、 Geochemistry 、 Hydrothermal circulation 、 Fault (geology) 、 Geology 、 Drainage basin 、 Groundwater 、 Geothermal gradient 、 Geochemistry and Petrology
摘要: Abstract The hydrothermal waters in the Vouzela region (Portugal) have a temperature of 68°C and are characterized by high content F, Li, B, bicarbonate, sulphate silica. Ninety-three water samples, including two waters, were analyzed for major trace elements order to investigate genesis water. In Older Hercynian Granites exposed, Abas Granite Sao Pedro do Sul Granite. is intersected Ribama fault. Albitization ubiquitous. Other alteration effects tourmalinization, K-feldspathization muscovitization. These processes associated Sn—W deposits induced intrusion Younger Viseu present situation rainwater penetrates into especially via fault greisenization zone. It becomes part system, leaches B silica, rises Termas springs de Sul. Geothermal equilibrium calculations yield 205 ± 10°C thermal reservoir. percentage mixing with cold groundwater near surface circulation system estimated at 73%. possibly maintained heat generated decay U, Th, K their daughter products, which encountered extremely concentrations
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