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Minerals 2018, 8(10), 456; https://doi.org/10.3390/min8100456

Structural Controls of Ore Mineralization in a Polydeformed Basement: Field Examples from the Variscan Baccu Locci Shear Zone (SE Sardinia, Italy)

1
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria (Blocco A), S.S. 554 bivio per Sestu, 09042 Monserrato (CA), Italy
2
Consiglio Nazionale delle Ricerche (CNR)-Istituto di Geoscienze e Georisorse, 56100 Pisa, Italy
*
Author to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 8 October 2018 / Accepted: 11 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Structural Control of Mineral Deposits: Theory and Reality)
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Abstract

The Baccu Locci mine area is located in a sector of the Variscan Nappe zone of Sardinia (the Baccu Locci shear zone) that hosts several type of ore deposits mined until the first half of the last century. The orebodies consist of lenses of Zn–Cu sulphides, once interpreted as stratabound, and Qtz–As–Pb sulphide ± gold veins; the implication of structural controls in their origin were previously misinterpreted or not considered. Detailed field mapping, structural analyses, and ore mineralogy allowed for unraveling how different ore parageneses are superimposed each other and to recognize different relationships with the Variscan structures. The sulphide lenses are parallel to the mylonitic foliation, hosted in the hinges of minor order upright antiforms that acted as traps for hydrothermal fluids. The Qtz–As–Pb sulphide veins crosscut the sulphide lenses and are hosted in large dilatational jogs developed in the hanging wall of dextral-reverse faults, whose geometry is influenced by the attitude of reverse limbs of late Variscan folds. The ores in the Baccu Locci shear zone are best interpreted as Variscan orogenic gold-type; veins display mutual crosscutting relationships with mafic dikes dated in the same district at 302 ± 0.2 Ma, a reliable age for the mineralizing events in the area. View Full-Text
Keywords: sulphide lenses; hinge trap; dilational jogs; orogenic gold; mafic dikes; mineralization chronology; arsenopyrite; late Variscan strike-slip faults sulphide lenses; hinge trap; dilational jogs; orogenic gold; mafic dikes; mineralization chronology; arsenopyrite; late Variscan strike-slip faults
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Funedda, A.; Naitza, S.; Buttau, C.; Cocco, F.; Dini, A. Structural Controls of Ore Mineralization in a Polydeformed Basement: Field Examples from the Variscan Baccu Locci Shear Zone (SE Sardinia, Italy). Minerals 2018, 8, 456.

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