Geology of late-Variscan Sàrrabus pluton (south-eastern Sardinia, Italy). Issue 2 (1st December 2021)

• Record Type: Journal Article
• Authors: Secchi, F.; Naitza, S.; Oggiano, G.; Cuccuru, S.; Puccini, A.; Conte, A. M.; Giovanardi, T.; Mazzucchelli, M.
• Is Part Of: Journal of maps. Volume 17:Issue 2(2021)
• Page Start: 591
• Page End: 605
• Publication Date: 2021-12-01
• Subjects: Late-Variscan magmatism -- gamma-ray logging -- shear zone -- bimodal magmatism; Maps -- Periodicals; Cartography -- Periodicals; 912.05
• DOI: 10.1080/17445647.2021.1982032
• Languages: English
• ISSNs: 1744-5647

Abstract

ABSTRACT: This paper deals with the geological mapping of the late-Variscan Sàrrabus pluton, (south-eastern Sardinia), a shallow multiple and composite igneous complex dominated by several generations of granodiorites, metaluminous and peraluminous granites and repeated pulses of mantle-derived mafic magmas. The map has been compiled based on geological surveys at 1:10, 000 and 1:5, 000 scales, assisted by in situ gamma-ray spectrometry and detailed petrographic investigations. Granite-related ore deposits have been also reported. The emplacement age of the pluton can be constrained by U/Pb dating on zircons of Cala Regina granodiorite, yielding an age of 286 ± 9 Ma. The resulting scenario documents a bimodal magmatism controlled by an EW trending shear zone, followed by the shallower emplacement of several pulses of independent granite magmas.