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The tectonic and rheological evolution of an attenuated cross section of the continental crust: Ivrea crustal section, southern Alps, northwestern Italy and southern Switzerland

1991; Geological Society of America; Volume: 103; Issue: 2 Linguagem: Inglês

10.1130/0016-7606(1991)103 2.3.co;2

1943-2674

Mark R. Handy, A. Zingg,

Geological Modeling and Analysis

Research Article| February 01, 1991 The tectonic and rheological evolution of an attenuated cross section of the continental crust: Ivrea crustal section, southern Alps, northwestern Italy and southern Switzerland M. R. HANDY; M. R. HANDY 1Geologisches Institut, Universität Bern, Baltzerstrasse 1, 3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar A. ZINGG A. ZINGG 2Geologisches Institut, Universität Basel, Bernoullistrasse 32, 4056 Basel, Switzerland Search for other works by this author on: GSW Google Scholar GSA Bulletin (1991) 103 (2): 236–253. https://doi.org/10.1130/0016-7606(1991)103 2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. R. HANDY, A. ZINGG; The tectonic and rheological evolution of an attenuated cross section of the continental crust: Ivrea crustal section, southern Alps, northwestern Italy and southern Switzerland. GSA Bulletin 1991;; 103 (2): 236–253. doi: https://doi.org/10.1130/0016-7606(1991)103 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 SocietyGSA Bulletin Search Advanced Search Abstract The tectonic and rheological evolution of the southern Alpine continental crust is reconstructed from structural, petrological, and radiometric studies in the Ivrea and Strona-Ceneri basement units. The deep crust of the southern Alps acquired its present compositional and metamorphic zonation during Paleozoic magmatism and amphibolite-to granulite-facies regional metamorphism. Inferred strength contrasts between lower crustal and upper mantle rocks in the Ivrea zone are low at the high temperatures of regional metamorphism. Late Paleozoic transtension and basic to intermediate magmatism in all crustal levels preceded extensional faulting associated with the formation of a passive continental margin during early Mesozoic time. Extensional uplift and cooling of the basement section is coupled with crustal-scale trends of increasing rheological stratification, grain size reduction, and strain localization. Mylonitic shear zones in the lower crust and a broad zone of noncoaxial shear at the base of the intermediate crust in the Ivrea zone are inferred to have controlled the high-strain rheology of the attenuating southern Alpine crust. The deep crust in the thinned Ivrea crustal cross section transferred noncoaxial strain from the upper mantle to the intermediate and upper crust. Final uplift and exposure of the deep southern Alpine crust occurred during Late Cretaceous to Tertiary Alpine thrusting. This content is PDF only. Please click on the PDF icon to access. 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.