Publication Date:
2022-06-06
Description:
We present the results of geological and structural investigation documenting the interaction between hydrothermal
fluids and host rock leading to a vein-type ore mineralization at shallow crustal depths (〈7 km) in the
mining district of the eastern Island of Elba (Italy). Sulfide- and iron-rich veins and breccia in addition to minor
massive iron-ore bodies form the mineralized system. Structural mapping and analysis of vein systems, fractures,
faults and associated fault rocks as well as fracture opening modes show that the main factors controlling the
formation and distribution of the mineralization are lithology, deformation style and deformation intensity.
Their interplay led to a positive feedback between the evolution of pore pressure through time, strain localization
and the resulting mineralization. Inversion of fault and vein data defines an E-W extensional stress field at
the time of faulting, which favoured fluid ingress and pervasive flow within the porous host sandstone, interstitial
sulfide precipitation and reduction of the primary bulk porosity. Subsequently, cyclic channelized fluid
flow during repeated fluid ingresses caused extensive veining and numerous episodes of breccia formation.
Description:
Published
Description:
210-230
Description:
1T. Struttura della Terra
Description:
JCR Journal
Keywords:
Hydrothermalism
;
Upper crust
;
Faulting
;
Fluids Island of Elba
;
Structural analysis
;
Island of Elba
;
Northern Apennines
;
deformation and hydrothermal fluid circulation in upper crust
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
