Tectonics, ore bodies, and gamma-ray logging of the Variscan basement, southern Gennargentu massif (central Sardinia, Italy)

Mattia Alessio Meloni, Giacomo Oggiano, Antonio Funedda, Marco Pistis and Ulf Linnemann

Journal of Maps, 2017, vol. 13, issue 2, 196-206

Abstract: We present a structural geological map (1:14,000 scale) that covers a 100 km2 area of Variscan basement rocks exposed in central Sardinia. The mapped area is located between 39°56′20′′ N 9°04′59′′ E (northwestern corner) and 39°51′47′′ N 9°13′16′′ E (southeastern corner) on the southern slope of the Gennargentu massif, surrounding the mining village of Gadoni. This village was the hub of a mining district in central Sardinia. The region extends between the external and inner nappe zones of the Variscan orogenic wedge of Sardinia. Despite significant mining, the area lacked an up-to-date structural and stratigraphic synthesis comparable to that achieved in the southern Sardinia. This gap in knowledge was due to: (i) more complex structural deformation; (ii) slightly higher grade regional metamorphism including a late Variscan high-temperature overprint; (iii) difficulty in distinguishing terrigenous stratigraphic units that belong to different tectonic units; and (iv) the absence of key stratigraphic marker for resolve complex structures in the uppermost tectonic unit. Integration of field mapping, structural analysis, portable gamma-ray spectroscopy, and zircon U-Pb ages of intrusive rocks has enabled a new geological map and cross-sections. These contributions synthesize the collisional and postcollisional evolution of the region and its relationship with ore genesis.

Date: 2017
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DOI: 10.1080/17445647.2017.1287601

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