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Structural and Magmatic Controls on Late Variscan Metallogenesis: Evidences from Southern Sardinia (Italy)

Authors: Naitza, Stefano; Oggiano, Giacomo; Casini, Leonardo; Cuccuru, Stefano; Secchi, Francesco; Funedda, Antonio; Tocco, Sandro;

Structural and Magmatic Controls on Late Variscan Metallogenesis: Evidences from Southern Sardinia (Italy)

Abstract

The late Variscan post-collisional events in Sardinia generate two main types of ore deposits: (1) intrusion hosted/related deposits; (2) "orogenic", structurally-controlled deposits associated with shear zones. The former include Pb-Zn (Ag, Cu), Ni-Co-As-Bi and F-Pb veins, W and Sn veins, Mo greisens, Pb-Zn-Cu skarns; the latter are characterised by Au +/- Sb +/- W associations, and As-Zn-Cu-Pb-Ag veins, formed at different structural levels. Intrusion-hosted/related ores are relative to two intrusive phases: an early pre-300 Ma phase (mostly granodiorites and monzogranites), and a later 288-286 Ma phase (F-bearing leucogranites). New geological and radiometric data suggest time/space and genetic association of the "orogenic" mineralisation to the pre-300 Ma magmatic phase. The 304-286 Ma interval may be assumed as the age of the Variscan metallogenic peak in southern Sardinia. Partial melting of discrete portions of the lithosphere during late Variscan post-collisional extension should be regarded as the most reliable source of metals.

Country
Italy
Keywords

Structural controls; Intrusive magmatism; Late Variscan; Metallogenic peak; Sardinia, Structural controls; intrusive magmatism; Late Variscan; metallogenic peak; Sardinia

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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