Fracture-driven intrusion and upwelling of a mid-crustal pluton fed from a transpressive shear zone--The Rieserferner Pluton (Eastern Alps)

Abstract

Research Article| January 01, 2006 Fracture-driven intrusion and upwelling of a mid-crustal pluton fed from a transpressive shear zone—The Rieserferner Pluton (Eastern Alps) Ralph Wagner; Ralph Wagner 1Institut für Geowissenschaften, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany Search for other works by this author on: GSW Google Scholar Claudio L. Rosenberg; Claudio L. Rosenberg 1Institut für Geowissenschaften, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany Search for other works by this author on: GSW Google Scholar Mark R. Handy; Mark R. Handy 1Institut für Geowissenschaften, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany Search for other works by this author on: GSW Google Scholar Christoph Möbus; Christoph Möbus 2Institut für Geowissenschaften, Justus Liebig Universität Giessen, Senckenbergstraße 3, 35390 Giessen, Germany Search for other works by this author on: GSW Google Scholar Markus Albertz Markus Albertz 3Oceanography Department, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (2006) 118 (1-2): 219–237. https://doi.org/10.1130/B25842.1 Article history received: 04 May 2005 accepted: 16 Jun 2005 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Ralph Wagner, Claudio L. Rosenberg, Mark R. Handy, Christoph Möbus, Markus Albertz; Fracture-driven intrusion and upwelling of a mid-crustal pluton fed from a transpressive shear zone—The Rieserferner Pluton (Eastern Alps). GSA Bulletin 2006;; 118 (1-2): 219–237. doi: https://doi.org/10.1130/B25842.1 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 Rieserferner Pluton was emplaced at a depth of 12–15 km into steeply dipping, greenschist-facies mylonitic rocks of the Austroalpine basement, just south of the Tauern Window (Eastern Alps). Intrusion occurred during north-south–directed shortening and east-west horizontal extension in front of the rigid Southern Alpine Indenter. The regional strain field is transpressive, with a strong coaxial component, and is characterized by east-west stretching. Tonalitic melt ascended through a feeder channel preserved in the steep southern part of the Rieserferner Pluton, within and adjacent to the steep mylonitic foliation of a major shear zone, the Defereggen-Antholz-Vals (DAV) Line. Melt ascent was perpendicular to the north-south shortening direction in the country rocks. Magma emplacement involved melt-induced hydro-fracturing to form a subhorizontal, tabular pluton that protruded northward from the DAV Line into the previously folded country rocks. During the late stage of emplacement, buoyant upwelling of the partly recrystallized magma induced doming of the pluton roof as well as vertical ductile shortening of the directly overlying country rocks. Magma pressure therefore locally exceeded the lithostatic pressure. Thermal modeling constrains the maximum time for doming and solidification of the pluton to have been 32,000 yr. The wavelength of the domes in the pluton roof indicates the viscosity contrast between country rock and partly crystallized tonalite in the pluton to have been at least 100:1. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.