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Trace-Element Distribution on Sulfide Mineralization in Trento Province, NE Italy

1
Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
2
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, 50121 Firenze, Italy
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MUSE—Museo delle Scienze di Trento, Corso del Lavoro e della Scienza 3, 38122 Trento, Italy
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Ecomuseo Argentario, Via Cesare Battisti 1, 38045 Civezzano (TN), Italy
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Freelance researcher, Via Ponte Alto 30/c, 32020 Rivamonte Agordino (BL), Italy
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 736; https://doi.org/10.3390/min9120736
Received: 25 October 2019 / Revised: 18 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Sulfide Geochemistry)
Sulfide mineralization in the province of Trento (northeastern Italy) includes various mineral assemblages that are often silver-rich and have been exploited in different phases from the Middle Ages until the 20th century. This study investigates mineralized rocks from three historically important sites (Calisio mount, Erdemolo lake, and the locality of Cinque Valli), providing new analytical data (Inductively Coupled Plasma-Mass Spectrometry on bulk rocks, and Scanning Electron Microscopy on thin sections) that demonstrate that parageneses do not only include galena, chalcopyrite, and sphalerite but also accessory minerals, such as tetrahedrite, tennantite, acanthite, and sulfosalts (matildite/polybasite). This explains the high content of As (up to 278 ppm), Bi (up to 176 ppm), and Sb (up to 691 ppm) that are associated with Pb–Cu–Zn mineralization. Notably, trace-element ratios indicate that, although closely associated from a geographical point of view, the studied sites are not genetically related and have to be referred to in distinct mineralization events, possibly induced by three diverse magmatic and hydrothermal phases that occurred in the Variscan post-orogenic setting. Besides geological and petrogenetic reconstruction, the new data outline potential geochemical risks, as they reveal a high concentration of elements characterized by marked toxicity that can be transferred into the local soil and water. Therefore, future studies should be devoted to better investigating the metal distribution in the surroundings of ancient mining sites and their geochemical behavior during the weathering processes.
Keywords: sulfide mineralization; Trento; trace-elements; accessory minerals sulfide mineralization; Trento; trace-elements; accessory minerals
MDPI and ACS Style

Bianchini, G.; Natali, C.; Ferretti, P.; Casagrande, L.; Conedera, M.; Marchina, C. Trace-Element Distribution on Sulfide Mineralization in Trento Province, NE Italy. Minerals 2019, 9, 736.

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