Ar-40/Ar-39 hornblende dating of a microgranodiorite dyke: implications for early Permian extension in the Moldanubian Zone of the Bohemian Massif

Kosler, J.; Kelley, S. and Vrana, S. (2001). Ar-40/Ar-39 hornblende dating of a microgranodiorite dyke: implications for early Permian extension in the Moldanubian Zone of the Bohemian Massif. International Journal of Earth Sciences, 90(2) pp. 379–385.

DOI: https://doi.org/10.1007/s005310000154

Abstract

Laser fusion Ar-40/Ar-39 ages of titanian pargasite from a microgranodiorite dyke swarm in the southern Bohemian Massif effectively date the early Permian (late Autunian) emplacement of dykes into a cool Moldanubian crust, This intrusion represents the youngest magmatic phase recorded in this part of the Moldanubian Zone. Strontium and neodymium iso topic ratios of microgranodiorites point to magma derivation from re-melting the lower crustal rocks with a possible component of upper mantle composition. Spatial and temporal association of the dykes with movements on a major N-S (NNE-SSW) tectonic discontinuity (Blanice-Kaplice-Rodl fault zone) suggests that their emplacement corresponds to the maximum age of fault movements associated with the E/W- oriented extension in this part of the Bohemian Massif.

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About

  • Item ORO ID
  • 4216
  • Item Type
  • Journal Item
  • ISSN
  • 1437-3254
  • Keywords
  • Moldanubian Zone; Bohemian Massif; Ar-40/Ar-39 hornblende dating; extension; IGNEOUS ROCKS; VARISCAN; AUSTRIA
  • Academic Unit or School
  • Institute of Educational Technology (IET)
  • Depositing User
  • Simon Kelley

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