Helium evidences for mantle degassing in the groundwater of Madeira Island – Portugal

• Published in: Applied Geochemistry
• Main Authors: Amaral, Helena I.F., Midões, Carla, Kipfer, Rolf
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2017
• Subjects: mantle helium; deep gases; stable isotopes; volcanic hydrogeology; madeira island; Young Island
• Online Access: https://doi.org/10.1016/j.apgeochem.2017.03.019

The Madeira Island is fed by an active hotspot, but there are no evidences of current volcanism and geothermal activity or, of a heat source at depth, which probably justifies why only low temperature and low TDS groundwater is found in Madeira. Nonetheless, Madeira is a relatively young island (≤7...