R.L.M. Vissers, M. R. Drury, E. H. Hoogerduijn Strating, D. van der Wal; Shear zones in the upper mantle: A case study in an Alpine Iherzolite massif. Geology ; 19 (10): 990–993. doi: https://doi.org/10.1130/0091-7613(1991)019<0990:SZITUM>2.3.CO;2
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The Erro-Tobbio upper-mantle lherzolite of northwest Italy, emplaced in the Alpine suture zone during collision of the European and Adriatic plates, has preserved a set of major shear zones formed at temperatures in the range 800-1040 °C during the period of Jurassic rifting and breakup and development of the Piemonte-Ligurian oceanic basin. These structures clearly demonstrate localization of the deformation in the Piemonte-Ligurian upper mantle during lithosphere stretching and breakup.