Séminaire ISTerre
Acid Mine Drainage in The Iberian Pyrite Belt: Origin, Remediation and Waste Valorization
jeudi 14 janvier 2021 - 11h00
Carlos Ayora - Institute of Environmental Assessment and Water Research, CSIC, Barcelona---
The Iberian Pyrite Belt (SW Spain and S Portugal) is one of the largest massive sulfide provinces in the world with estimated original reserves of 1700 Mt. Thousands of years of mining have resulted in large number of wastes and more than one hundred orphan sources of high-acidity mine drainage. These drainages have made that the rivers Tinto and Odiel deliver a significant percentage of the global flux of continental metals to the oceans. The Tinto River is acidic from the origin to the estuary, and its geochemistry is controlled by the Fe cycling. The Odiel River, however, carries up to five times more water, and it is initially neutral. The alkalinity of the Odiel River neutralizes the first acid tributaries. Downstream, due to the progressive exhaustion of its alkalinity, the Odiel River becomes acidic to the estuary. The future use of the water for agriculture requires the neutralization of the main acidic drainages. Present day passive remediation systems are based on fine-grained limestone sand dispersed on the surface of a coarse inert matrix of wood shavings. Limestone dissolution raises pH to values around 6 and Fe(III) and then Al oxyhydroxides precipitate. The high porosity of the wood shavings allocates the new precipitates maintaining a high hydraulic conductivity. The accumulation of wastes from AMD treatment motivates the research for their valorization in a circular economy perspective. Thus, scandium, yttrium and lanthanides are entirely retained within the Al oxyhydroxide waste with rates similar to rare earth deposits in clays.
Equipe organisatrice : Grands Séminaires ISTerre
Séminaire uniquement en visio
Informations de visio :
https://univ-grenoble-alpes-fr.zoom.us/j/91302911459?pwd=OTJvYTVPenQxS1FpWVhzQ0tBc1BmUT09
ID de réunion : 913 0291 1459
Code secret : 661771
“Minimalist seismology”: studying earthquakes with sparse instrumentation
jeudi 17 septembre 2026 - 11h00
Mathieu Causse - ISTerre
Equipe organisatrice : Organisation labo
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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Stable‑to‑dynamic expansion of fault slipping area through fluid injection observed in laboratory experiments using a sub‑meter scale specimen
vendredi 18 septembre 2026 - 14h00
Takatoshi Ito - Université de Tohoku, Japan
Equipe organisatrice : Mécanique des failles
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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Tectonics, Mantle Dynamics and Coupled Lithosphere-Mantle-Core Evolution of Earth and Other Rocky Worlds
jeudi 24 septembre 2026 - 11h00
Paul Tackley - ETH Zurich
Equipe organisatrice : Grands Séminaires ISTerre
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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Tectonics, Mantle Dynamics and Coupled Lithosphere-Mantle-Core Evolution of Earth and Other Rocky Worlds
jeudi 24 septembre 2026 - 11h00
Paul Tackley - ETH Zurich
Equipe organisatrice : Grands Séminaires ISTerre
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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Apport des expériences analogiques pour la modélisation et le suivi en temps réel de la propagation du magma en profondeur : Exemple du Rift Est Africain
jeudi 1er octobre 2026 - 11h00
Virginie Pinel - ISTerre
Equipe organisatrice : Organisation labo
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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A t-on encore besoin de plaques pour expliquer la tectonique de la vallée du Rhône et des Alpes Occidentales ?
vendredi 2 octobre 2026 - 11h00
philippe VERNANT - Geosciences Montpellier
Equipe organisatrice : Tectonique active et sismicité
Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères
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TBA
vendredi 2 octobre 2026 - 14h00
Hugo Boulze -
Equipe organisatrice : Cycle sismique et déformations transitoires
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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TBA
vendredi 9 octobre 2026 - 11h00
Eric Beaucé - ISTerre
Equipe organisatrice : Cycle sismique et déformations transitoires
Salle Dolomieu, Maison des Géosciences, 38400 Saint Martin d'Hères
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TBA
vendredi 20 novembre 2026 - 11h00
Farzaneh Mohammadi - ENS Paris
Equipe organisatrice : Cycle sismique et déformations transitoires
Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères
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