Communication Dans Un Congrès Année : 2023

Metal Endowment of Magmatic Brines from Active Geothermal Reservoirs

Résumé

Exploration for efficient clean geothermal power is targeting ever deeper "supercritical" geothermal reservoirs. Many supercritical reservoirs are accumulations of high-temperature magmatic fluids. Unlike heated meteoric water, these saline fluids and hypersaline brines contain significant endowments of critical elements. To quantify these endowments we examined brine inclusions from 3 active geothermal systems (Kakkonda, Japan; Larderello, Italy; Muara Laboh, Indonesia) and deep samples from 2 active volcanoes (Soufriere Hills Volcano, Montserrat; Ascension Island Volcano, mid-Atlantic). The brines recovered from these systems are extremely salty, (TDS > 50wt% NaCleq). The highest temperature inclusions show maximum trapping temperatures > 500 degrees C. Maximum concentrations of selected elements are: 0.27% Sr and 3 ppm Au ( Larderello); 2.7% Mn, 0.9% Zn, 0.7% Cu, 0.3% Pb ( Kakkonda); 0.2wt% Cu (Muara Laboh); 0.5% B, 900 ppm Ba, 500 ppm Li and 90 ppm Ag (Montserrat); 0.19% Rb, 350 ppm Mo, 180 ppm W and 4 ppm Au (Ascension). We will show how these brines fit into a broader picture of ancient ore fluids, and modern geothermal systems. Our data also suggest that recovery of these critical elements could provide additional economic value to geothermal production and some systems could become a new versatile economic resource in their own right.

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Dates et versions

hal-04921008 , version 1 (30-01-2025)

Identifiants

  • HAL Id : hal-04921008 , version 1

Citer

Brian Tattitch, Jon Blundy, Oscar Laurent. Metal Endowment of Magmatic Brines from Active Geothermal Reservoirs. 17th Biennial SGA Meeting (SGA 2023), Aug 2023, Zurich (CH), Switzerland. p196-199. ⟨hal-04921008⟩
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