Publication details
Geneze páskovaných granitoidních hornin peralkalického masivu Khan Bogd v jižním Mongolsku
| Title in English | Origin of layered granitic rocks of the Khan Bogd peralkaline massif in southern Mongolia |
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| Authors | |
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Zprávy o geologických výzkumech v roce 2009 |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | magmatic layering; ekerite; aplite; pegmatite; Khan Bogd massif; Mongolia |
| Description | The Permian post-collisional A-type peralkaline granitic complex of Khan Bogd is located in the Gobi desert in southern Mongolia. The Khan Bogd, one of the world’s largest peralkaline ring complexes, is a product of extended fractional crystallization. Layered granitic ring dykes of the Khan Bogd peralkaline massif occur near the contact with the host rocks and the roof pendants of the surrounding volcanic arc complex. Combined field and petrographic investigation of rhythmically layered ekerite-aplite-pegmatite series suggest they were emplaced during transitions from the ductile to the brittle regime. Adiabatic changes of pressure (“swinging eutectic”) connected with ductile-to-brittle transitions, resulted in repeated episodes of undercooling during which crystallized the volatile-rich ekeritic layers. |
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