UNIGE document Doctoral Thesis
previous document  unige:102553  next document
add to browser collection
Title

Crystallization age of alpine cleft monazite-(Ce) and correlation with tectonically driven hydrothermal dissolution/precipitation events

Author
Directors
Defense Thèse de doctorat : Univ. Genève, 2017 - Sc. 5135 - 2017/10/23
Abstract Hydrothermal monazite-(Ce) from open clefts/fissure veins in the Alps was utilized as a complimentary tool for dating brittle-ductile/brittle deformation. It may preserve evidence of several crystallization events, commonly over 4-7 Ma, up to ~20 Ma. Monazite-(Ce) crystallizes within ~350-200 °C during tectonic and/or fluid flux events disequilibrating the fluid-crystal/rock chemistry within a cleft. It resists alteration/diffusion under prevailing p-T conditions, but may experience new/re-crystallization or dissolution-reprecipitation. Ages from the northeastern Alps, Austria, of 90-70 Ma cover near peak metamorphism during Eo-Alpine collision over orogenic collapse to extension. In the eastern Tauern Window, ages date metamorphic dome exhumation during Alpine collision at ~19-15 Ma. In the Lepontine dome area ages of ~19-5 Ma date early exhumation, doming and a later change after 12 Ma from thrusting to strike-slip movements, linked to a progressive concentration of deformation towards the extended Rhone-Simplon/Penninic Front fault system in the Mont-Blanc/Aiguilles-Rouges, Aar and western Lepontine areas.
Identifiers
URN: urn:nbn:ch:unige-1025533
Full text
Thesis (33.6 MB) - document accessible for UNIGE members only Limited access to UNIGE (until 2019-02-13)
Structures
Research group Isotope Geochemistry, Geochronology and Thermochronology
Projects FNS: 200021-143972
FNS: 200020-165513
Citation
(ISO format)
BERGEMANN, Christian. Crystallization age of alpine cleft monazite-(Ce) and correlation with tectonically driven hydrothermal dissolution/precipitation events. Université de Genève. Thèse, 2017. https://archive-ouverte.unige.ch/unige:102553

55 hits

1 download

Update

Deposited on : 2018-02-26

Export document
Format :
Citation style :