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| Titel |
The Tommot pluton: a Middle Paleozoic rift-related alkaline gabbro and syenite complex, Yakutia, northeast Russia |
| VerfasserIn |
V. A. Trunilina, P. W. Layer, L. M. Parfenov, A. I. Zaitsev, Y. S. Orlov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1868-4556
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| Digitales Dokument |
URL |
| Erschienen |
In: Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov ; Nr. 4 (2009-09-17), S.97-109 |
| Datensatznummer |
250001442
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| Publikation (Nr.) |
 copernicus.org/smsps-4-97-2009.pdf |
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| Zusammenfassung |
| The Tommot pluton is located within the continental Omulevka terrane of the
inner zone of the Verkhoyansk-Kolyma Mesozoic orogen. It is a small complex
(~12 km2) composed of alkaline-ultramafic rocks, alkaline and
subalkaline gabbroids, and alkaline and quartz syenites. The pluton is unique
both in the composition and age of its constituent rocks.
Mineralogical-petrographical and geochemical studies of the rocks indicate
that the alkaline rocks resulted from the melting of depleted mantle
horizons. K-Ar, Rb-Sr, and 40Ar/39Ar age determinations confirm a
Paleozoic age of the rocks. Formation of the alkaline rocks is related to
Middle Paleozoic rifting which occurred as two discrete events: a Late
Devonian event, which affected the marginal part of the Siberian continent,
and a Late Carboniferous event that reflects internal deformation of the
Omulevka terrane or late-stage extension. A spatially associated alkali
granite, the Somnitel'nyy pluton, is Late Jurassic–Early Cretaceous in age
and is synchronous with accretion of the Kolyma-Omolon Superterrane to
Siberia in the Mesozoic. |
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