Della presenza del ferro oligisto nei giacimenti ofiolitici di Toscana

Meneghini, Giovanna

doi:10.1007/bf02903245

Cited by 1 publication

(3 citation statements)

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“…T1-type ore forms independent bodies, may be found in close association with T2-type deposits, and occurs as fragmented clasts within T2-type and T3type orebodies. The obvious textural difference between the T1 and T2/T3 types has been noted since the earliest scientific investigation [33,34] and led to the distinction between primary T1-type deposits, referred to as "filoni iniettati" (injected lodes), and T2-, T3-type reworked deposits, referred to as "filoni impastati" (kneaded lodes).…”

Section: The Tuscan Cu-zn Vms Depositsmentioning

confidence: 99%

“…Chalcopyrite stockworks and disseminations are widespread all along the upper contact of the main sill of gabbro and into the serpentinite host [34,46]. However, their limited extension, both laterally and downdip, hampered the development of mining activity.…”

Section: Orebody Geometry and Local Geological Settingmentioning

confidence: 99%

“…Most of these mines are no longer accessible, but thanks to the sensitivity of the mining engineers who managed the mine in the 19th century (Aroldo and Augusto Schneider), many ore and host rock samples were donated to the mineralogical museums of Italian universities. The mines were visited and studied by all the major Italian and European geologists and mineralogists of the time, who left numerous scientific publications [33][34][35]41,42,44,45]. A few scientific papers about these deposits were published also in the second half of the 1900s [36,43].…”

Section: T3-typementioning

confidence: 99%

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The Ophiolite-Hosted Cu-Zn VMS Deposits of Tuscany (Italy)

Dini,

Rielli,

Di Giuseppe

et al. 2024

Minerals

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Several Jurassic, ophiolite-hosted Cu-Zn VMS deposits occur in Tuscany. They are hosted by tectonic units of oceanic affinity (Ligurian Units), such as the well-known deposits of nearby Liguria. Industrial production was small and definitively ceased in the 1960s. Locally, massive ore (chalcopyrite-bornite-chalcocite) with an exceptionally high grade was found. The Montecatini Val di Cecina mine exploited the largest “bonanza” and, for few decades in the 19th century, became one of the most profitable copper mines in Europe. This study provides an updated review of these deposits. Tuscan Cu-Zn VMSs mostly occur in proximity of the contact between the serpentinite-gabbro basement and the overlying basalts. Chalcopyrite-pyrite stockworks occur in serpentinite-gabbro cut by dolerite dykes, while the largest massive sulphide bodies are hosted by polymictic-monomictic breccias at the base of pillow basalts. Early chalcopyrite ores were mechanically–chemically reworked and upgraded to bornite-rich nodular ore embedded in a chlorite, calcic amphibole, Fe-rich serpentine, quartz, andradite, ilvaite, and xonotlite assemblage. This bornite-rich ore contains substantial amount of sphalerite and pyrite and ubiquitous grains of clausthalite, hessite, tellurium, and gold. They represent a prime example of the sub-seafloor portion of a hybrid mafic-ultramafic oceanic hydrothermal system formed in an OCC along the slow spreading ridge of the Jurassic Piedmont-Ligurian Ocean. The peculiar mineralogical–textural character of the bornite-rich ore was driven by an interface coupled dissolution–precipitation process mediated by fluids.

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Section: The Tuscan Cu-zn Vms Depositsmentioning

confidence: 99%

Section: Orebody Geometry and Local Geological Settingmentioning

confidence: 99%