Mineralogy and Petrology

, Volume 89, Issue 3–4, pp 217–249 | Cite as

Petrology and 40Ar–39Ar dating of shear zones in the Lanterman Range (northern Victoria Land, Antarctica): implications for metamorphic and temporal evolution at terrane boundaries

  • L. Crispini
  • G. Di Vincenzo
  • R. Palmeri


The Lanterman Fault Zone, a major terrane boundary in northern Victoria Land, displays a polyphase structural evolution. After west-over-east thrusting, it experienced sinistral strike-slip shearing. Sheared metabasites from the Wilson Terrane (inboard terrane) preserve a record of retrograde metamorphic evolution. Shearing took place under amphibolite-facies metamorphic conditions (roughly comparable to those reached during regional metamorphism) which later evolved to greenschist-facies conditions. In contrast, the Bowers Terrane (outboard terrane) preserves a prograde metamorphic evolution which developed from greenschist-facies to amphibolite-facies metamorphism during shearing, followed by greenschist-facies metamorphism during the late deformational stages. Laser step-heating 40Ar–39Ar analyses of syn-shear amphibolite-facies amphiboles yielded ages of 480–460 Ma, in agreement with a ∼480-Ma age obtained from a biotite aligned along the mylonitic foliation. These ages are younger than those (∼492 to ∼495 Ma) obtained from pre-shear amphibole relics linked to regional metamorphism of the Wilson Terrane. Results attribute the structural and metamorphic reworking during shearing to the late stages of the Cambrian-Ordovician Ross Orogeny and to the Middle-Late Ordovician probably in relation to the beginning of deformation in the Lachlan Orogen, thus precluding any appreciable impact of the Devonian-Carboniferous Borchgrevink event in the study area.


Shear Zone Contrib Mineral Petrol Regional Metamorphism White Mica Mylonitic Foliation 
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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • L. Crispini
    • 1
  • G. Di Vincenzo
    • 2
  • R. Palmeri
    • 3
  1. 1.Dipartimento per lo studio del Territorio e delle sue RisorseUniversità di GenovaGenovaItaly
  2. 2.Istituto di Geoscienze e Georisorse – CNRPisaItaly
  3. 3.Museo Nazionale dell’Antartide, Università di SienaSienaItaly

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