Late Jurassic magmatism in the Ligurian‐Piedmont Ocean constrained by zircon ages of mafic and felsic meta‐intrusives

Author:

de Togni Marcello1,Balestro Gianni1,Rubatto Daniela2,Castelli Daniele1,Gattiglio Marco1,Festa Andrea13

Affiliation:

1. Department of Earth Sciences University of Turin Turin Italy

2. Institute of Geological Sciences University of Bern (Universität Bern) Bern Switzerland

3. Institute of Geoscience and Earth Resources National Research Council Turin Italy

Abstract

AbstractPaleogeographic reconstructions show that the Ligurian‐Piedmont Ocean (LPO) was a relatively narrow oceanic basin but the actual amount of oceanic lithosphere generated and the timing of magmatic accretion are still subjects of debate. New U–Pb dating of zircon from two pairs of FeTi‐oxide metagabbro and metaplagiogranite s.l. of the Susa and Lanzo Valleys Ophiolites (Western Alps) yields Late Jurassic magmatic ages (~150 Ma), 10–15 Ma younger than most of the magmatism in the LPO. The potential significance of the geochronological data presented are discussed in relation to the structural architecture of the LPO, emphasizing that the investigated ophiolites represent the youngest oceanic lithosphere accreted in the Western Alps.

Publisher

Wiley

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