Exhumation of coesite-bearing rocks in the Dora Maira Massif (western Alps, Italy)

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Coesite-bearing, very high pressure rocks in the southern Dora Maira massif emerged from a depth of 100 km during Cretaceous time. Tectonic contacts above the coesite-bearing rocks are retrograde ductile shear zones that operated with a normal sense of motion: they cut out thick crustal sections and caused the condensation of the Eoalpine baric and thermal structure. The result of this was the lateral dispersion of the Eoalpine orogenic wedge and the facilitation of the unroofing of the very high P rocks. The rocks reached relatively shallow crustal levels by ca. 40 Ma, and the attenuated sequence overthrust a more external unit. These indicate that the exhumation took place within an overall plate convergence setting, prior to the final suturing of Europe and Adria. -from Author

Original languageAmerican English
Pages (from-to)947-950
Number of pages4
Issue number10
StatePublished - 1992
Externally publishedYes


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