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.

Viewing alternatives

Metrics

Public Attention

Altmetrics from Altmetric

Number of Citations

Citations from Dimensions
No digital document available to download for this item

Item Actions

Export

About