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

Research Article| October 01, 1992 Exhumation of coesite-bearing rocks in the Dora Maira massif (western Alps, Italy) Dov Avigad Dov Avigad 1Laboratoire de Géologie, Ecole Normale Supérieure, 24 rue Lhomond, Paris 75231, France Search for other works by this author on: GSW Google Scholar Author and Article Information Dov Avigad 1Laboratoire de Géologie, Ecole Normale Supérieure, 24 rue Lhomond, Paris 75231, France Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (10): 947–950. https://doi.org/10.1130/0091-7613(1992)020<0947:EOCBRI>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Dov Avigad; Exhumation of coesite-bearing rocks in the Dora Maira massif (western Alps, Italy). Geology 1992;; 20 (10): 947–950. doi: https://doi.org/10.1130/0091-7613(1992)020<0947:EOCBRI>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Coesite-bearing, very high pressure rocks in the southern Dora Maira massif, western Alps, Italy, emerged from a depth of 100 km during Cretaceous time. These rocks are now covered only by a thin fraction of the synmetamorphic overburden. 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 from within the tectonometamorphic pile 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. Extensional unroofing is consistent with the absence of deeply cutting Cretaceous erosion, and with pressure-temperature paths that show that the very high P rocks cooled during decompression. The very high Procks reached relatively shallow crustal levels by ca. 40 Ma, and the attenuated sequence overthrust a more external unit. These indicate that the exhumation of the very high P rocks took place within an overall plate onvergence setting, prior to the final suturing of Europe and Adria. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.