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Modelo conceptual do recurso hidromineral das Quenturas, Vulcão das Furnas, Ilha de São Miguel: um contributo
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Advisor(s)
Abstract(s)
RESUMO: O Vulcão das Furnas, na ilha de São Miguel, comporta no seu
interior uma grande variabilidade de nascentes, que se podem classificar
em 5 tipos distintos, nomeadamente frias lisas, frias gasocarbónicas, termais
ácidas, termais básicas e condensado de fumarola, de características
marcadas e variadas, originando a designada “Hidrópole” das Furnas. A
Concessão Hidromineral das Furnas comporta parte importante destas
nascentes, entre elas o Recurso Hidromineral das Quenturas, ou Água Férrea
das Quenturas, referida como “3”. Trata-se de uma água termal ácida, com
59 °C de temperatura, pH ácido e mineralização elevada, cuja origem se
considera corresponder ao aquecimento de aquíferos mais superficiais por
vapor hidrotermal que ascende do aquífero hidrotermal profundo,
conferindo a estas águas temperatura e uma importante componente
gasocarbónica. Dados isotópicos apontam uma altitude de recarga de cerca de
800 m para esta nascente e uma idade compreendida entre os 23 e os 30 anos.
ABSTRACT: Furnas Volcano, located on S. Miguel Island, is home to a large variety of springs, that can be classified in 5 different groups, namely cold waters, cold CO2-rich waters, thermal waters with low pH, thermal waters with high pH and fumaroles, each with distinctive characteristics, originating the “Furnas Hydropolis”. The Furnas Hidromineral Permit includes some of these springs, including the Quenturas spring, also known as Água Férrea das Quenturas, which is referred in the permit by the number “3”. Quenturas is a thermal water with low pH, with a temperature of 59 °C and high mineralization. It has its origin in the shallower aquifers that are heated by the hydrothermal steam provided by the deep-seated hydrothermal aquifers, providing them with temperature and an important gaseous component. Isotopic data estimates a recharge altitude of approximately 800 m for this spring, and 23 to 30 years of age.
ABSTRACT: Furnas Volcano, located on S. Miguel Island, is home to a large variety of springs, that can be classified in 5 different groups, namely cold waters, cold CO2-rich waters, thermal waters with low pH, thermal waters with high pH and fumaroles, each with distinctive characteristics, originating the “Furnas Hydropolis”. The Furnas Hidromineral Permit includes some of these springs, including the Quenturas spring, also known as Água Férrea das Quenturas, which is referred in the permit by the number “3”. Quenturas is a thermal water with low pH, with a temperature of 59 °C and high mineralization. It has its origin in the shallower aquifers that are heated by the hydrothermal steam provided by the deep-seated hydrothermal aquifers, providing them with temperature and an important gaseous component. Isotopic data estimates a recharge altitude of approximately 800 m for this spring, and 23 to 30 years of age.
Description
Keywords
Vulcão das furnas Modelo conceptual Recarga Quenturas Furnas volcano Conceptual model Recharge
Citation
Freitas et al. 2020, ‘Modelo conceptual do recurso hidromineral das Quenturas, Vulcão das Furnas, Ilha de São Miguel: um contributo´, Comunicações Geológicas, vol. 107, nº 1 (especial), pp. 97-98.
Publisher
LNEG - Laboratório Nacional de Energia e Geologia