P82. How tectonics and fluid-rock interaction shape Earth's resources?


Congressi SGI-SIMP

  • Barbara Marchesini - Sapienza Università di Roma
  • Antonio Caracausi - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Palermo
  • Chiara Boschi - Consiglio Nazionale delle Ricerche, IGG, Pisa
  • Andrea Billi - Consiglio Nazionale delle Ricerche, IGAG, Roma
  • Eugenio Carminati- Sapienza Università di Roma
Fault zones and fracture networks represent the main pathways for fluids in the lithosphere. They control the geometry of ore mineralizations along with fluid connectivity in reservoirs (e.g., hydrothermal, oil and gas). Circulation of fluids along faults and fractures may alter permeability properties and mineralogy of pristine rocks by a wide variety of fluid-assisted mechanisms (e.g., cementation, precipitation, dissolution, recrystallization and intracrystalline deformation). For instance, the reduction or increase in permeability due to fluid-rock interaction in a fractured volume of rocks may affect the efficiency of a reservoir, even causing fault instability under high-fluid pressure conditions.
Multiple events of fracturing and fluid flow, may thus induce a complex tectonic evolution in space and time of geological reservoirs, producing composite patterns of alteration mineral assemblages and ores and an heterogenous distribution of permeability. Interaction between fluids and rocks is also responsible for the formation of renewed, and potentially exploitable, fluid phase(s), such as H2 by reaction of water with ultramafic rocks or Fe-rich rocks.
We welcome contributions from all disciplines regarding how tectonics and mineral reactions proceed/interact in producing resources (e.g., ore deposits, geothermal and oil and gas reservoirs).
faults and fractures, fluid-rock interaction, permeability, geo-resources

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