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The geothermal potential of continental Yemen: new geochemical and isotopic insights from thermal water and gas discharges |
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Most thermal springs of continental Yemen, fumaroles and boiling water pools have
been sampled and analyzed for chemical and isotopic compositions in liquid and
associated free-gas phases. Whatever the emergence, all the water discharges have an
isotopic signature of meteoric origin. Springs discharging in the central volcanic
plateau show a prevalent Na-HCO3-composition, clearly affected by an anomalous flux
of CO2 likely related to active hydrothermal systems located in the Jurassic Amran
Group limestone sequence that underlies the 2000-3000 m thick volcanic suite and/or
the Cretaceous Tawilah Group sandstone. Although organic CO2 contribution from
meteoric recharge waters, at least at limited extent, cannot be ruled out, all the
CO2-rich gas samples have a 13C-CO2 signature that falls in the range of mantle CO2
(-3<13C<-7 ‰ V-PDB). The relatively high 3He/4He (1
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Id: |
24 |
Place: |
Volterra, Tuscany, Italy Campus SIAF, SP del Monte Volterrano
Localita' Il Cipresso
Volterra, Italy |
Starting date: |
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Duration: |
03' |
Primary Authors: |
Prof. MINISSALE, Angelo (CNR - Institute of Geosciences & Earth Resources, Via La Pira 4 – 50121 Firenze (Italy)) |
Co-Authors: |
Dr. MATTASH, M.A. (Ministry of Oil and Mineral Resources Board, Geological Survey & Minerals Resources Board, P.O. Box 297, Sana’a (Yemen)) Dr. HAZZAE, M.K. (Ministry of Oil and Mineral Resources Board, Geological Survey & Minerals Resources Board, P.O. Box 297, Sana’a (Yemen)) Prof. VASELLI, Orlando (Dept. Earth Sciences, Via La Pira 4 – 50121 Firenze (Italy)) Dr. TASSI, Franco (Dept. Earth Sciences, Via La Pira 4 – 50121 Firenze (Italy)) Dr. AL-GANAD, I.N. (Ministry of Oil and Mineral Resources Board, Geological Survey & Minerals Resources Board, P.O. Box 297, Sana’a (Yemen)) Dr. SELMO, E. (Dept. Earth Sciences, Parco Area delle Scienze 157A – 43100 Parma (Italy)) Dr. SHAWKI, M.N. (Dept. Geology, University of Ta’iz, P.O. Box 5679, Ta’iz (Yemen)) Prof. TEDESCO, Dario (Dept. Environmental Sciences, Via Vivaldi 43 - 81100 Caserta (Italy)) Prof. POREDA, Robert (Dept. Earth & Environmental Sciences, 227 Hutchinson Hall, Rochester, NY 14627 (U.S.A.)) Dr. AD-DUKHAIN, A.M. (Ministry of Oil and Mineral Resources Board, Geological Survey & Minerals Resources Board, P.O. Box 297, Sana’a (Yemen)) |
Presenters: |
Dr. TASSI, Franco |
Material: |
Slides Poster |
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