Journal
JOURNAL OF MAPS
Volume 13, Issue 2, Pages 196-206Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17445647.2017.1287601
Keywords
Variscan chain; structural map; gamma-ray spectroscopy; skarn; Sardinia
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Funding
- University of Sassari Ph.D. fund
- LR/7 RAS funds
- Fondazione di Sardegna fund (PRID
- University of Cagliari)
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We present a structural geological map (1: 14,000 scale) that covers a 100 km(2) area of Variscan basement rocks exposed in central Sardinia. The mapped area is located between 39 degrees 56'20 '' N 9 degrees 04'59 '' E (northwestern corner) and 39 degrees 51'47 '' N 9 degrees 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.
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