The role of geosciences in the assessment of low-temperature geothermal resources (N-Portugal) a review

• Type: Another Publication in an International Scientific Journal
• Date: 2010

Authors

Marques, Jose M (Author) Other; Carreira, P M (Author) Other; Marques, Jorge Manuel Espinha (Author) FCUP; Chamine, Helder I (Author) Other; Fonseca, P E (Author) Other; Monteiro A M Santos (Author) Other; Eggenkamp, HGM (Author) Other; Teixeira, José (Author) Other

Journal

Title: Geosciences Journal

Vol. 14 No. 4

Pages: 423-442

ISSN: 1226-4806

Publisher: Geological Society of Korea

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 17 Citations

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Authenticus ID: P-003-0GZ

DOI: 10.1007/s12303-010-0034-0

Abstract (EN): The aim of this paper is to review the results of the assessment of low temperature geothermal resources (issue tern peratures between 41 and 77 degrees C) that occur in the Portuguese mainland For this purpose, a multidisciplinary approach, including geologic tectonic geochemical, geophysical and isotopic (delta H-2, delta O-18, delta C-13 H-3 and C-14) techniques was applied in order to update local and/or regional conceptual circulation models Three case studies of N Portugal are presented and discussed This paper describes different low temperature geothermal waters presenting similar hydrogeological conceptual models but rather different geochemical signatures (e g, HCO3-Na with pH approximate to 8, HCO3/Na/CO2 rich with pH approximate to 7 and HCO3-Na with pH approximate to 9 type waters) In fact in the studied low temperature geothermal systems local/regional high altitude sites associated with highly fractured rocks play an important role in conducting the infiltrated meteoric waters towards the discharge zones near the Spas The discharge zones are mainly related to the intersection of major regional fault lineaments (and conjugate structures) responsible for creating the mineral waters ascent In some cases geochemical and isotopic data point out to the existence of anthropogenic contamination of some geothermal spring waters related to the intense use of fer tilizers in areas of widespread agricultural practices

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 20