Abstract
Gold has been found in the Cyprus-type volcanogenic massive sulfide ore (VMS) deposits of Corchia ophiolite (Parma province, Italy) in the Cantiere Donnini, Speranza and Pozzo mining sites. At Cantiere Donnini and Speranza, the mineralization occurs at the contact between pillow lava and sedimentary rocks. The Pozzo mineralization is hosted by a serpentinite. Concentrations of gold up to 3070 ppb have been reported for the Cantiere Donnini and up to 6295 ppb in the Pozzo mine. According to the field relationships, gold composition, mineralogical assemblage and sulfur isotope data, we can conclude that two different types of gold mineralization have been recognized in the Corchia ophiolite: (1) formed at low temperature in submarine environment (Cantiere Donnini and Speranza) and (2) formed at high temperature in the oceanic mantle (Pozzo) by segregation of an immiscible sulfide liquid.
Highlights
Several historical Cu–Fe–(Zn) ore deposits, classified as Cyprus-type volcanogenic massive sulfide ore (VMS) by [1,2], have been described in the ophiolites of the Northern Italian Apennines, geographically located in the regions of Emilia-Romagna and Liguria
We report geological, mineralogical and geochemical information of the Corchia sulfide deposits, with the aim of better understanding the origin of these gold mineralizations associated with Cyprus-type
Whole rock analyses presented in this study indicate that the concentration of gold in the Pozzo mine is significant, ranging from 1569 to 6295 ppb (Table 2)
Summary
Several historical Cu–Fe–(Zn) ore deposits, classified as Cyprus-type volcanogenic massive sulfide ore (VMS) by [1,2], have been described in the ophiolites of the Northern Italian Apennines, geographically located in the regions of Emilia-Romagna and Liguria. These mines are famous among the economic geologists and archeologists, because they have been known as a source of copper since. We report geological, mineralogical and geochemical information of the Corchia sulfide deposits, with the aim of better understanding the origin of these gold mineralizations associated with Cyprus-type
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