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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 (Digital Object Identifier) Link: http://dx.doi.org/10.1007/s005310000154
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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.

Item Type: Journal Article
ISSN: 1437-3254
Keywords: Moldanubian Zone; Bohemian Massif; Ar-40/Ar-39 hornblende dating; extension; IGNEOUS ROCKS; VARISCAN; AUSTRIA
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4216
Depositing User: Simon Kelley
Date Deposited: 04 Jul 2006
Last Modified: 02 Dec 2010 19:51
URI: http://oro.open.ac.uk/id/eprint/4216
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