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Received: 19 December 2011
Accepted: 29 September 2012
Online: 15 October 2012
H. Editor: M. Å temprok
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More articles on Geology of Mongolia

Original paper

Katarzyna Machowiak, Wojciech Stawikowski, Stanisław Achramowicz

Late Triassic 40Ar-39Ar ages of the Baga-Gazryn Chuluu granites (Central Mongolia)

Journal of Geosciences, volume 57 (2012), issue 3, 173 - 188


New radiometric data have been obtained for two-mica granites from the Baga-Gazryn Chuluu Pluton in Central Mongolia, classified previously as A-type granites based on their geochemical characteristics and tectonic position. Three most common granite varieties were dated by 40Ar-39Ar method on separated biotite. The following ages were obtained: 201.0 ± 3.6 Ma (2σ) for the coarse-, 211.9 ± 4.0 Ma for the medium-, and 209.4 ± 3.2 Ma for the fine-grained granites.
Such Late Triassic cooling ages agree well with the older assumptions on the time of emplacement of the Baga-Gazryn Chuluu Pluton, based on geological evidence and previous K-Ar dating. New geochronological data better constrain the age of granitic magmatism in post-collisional, extensional regime adjacent to the western part of the Mongol-Okhotsk suture zone in the Adaatsag area.

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