Affiliation:
1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
2. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; University of British Columbia
Abstract
40Ar/39Ar analyses were made on maruyamaite (potassium-dominant tourmaline) from tourmaline-quartz-feldspar rocks discovered within the Kumdy-Kol microdiamond deposit (Kokchetav massif, North Kazakhstan). Turmaline yielded well-defined40Ar/39Ar plateau age spectra whose values coincide within the error - ages of 502.3±8.0, 502.2±8.0, 506.0±8.0 Ma. These ages are much younger than the age of 530±2 Ma determined for high-pressure metamorphism by different methods. Thus, the formation of tourmaline-rich rocks of the Kumdy-Kol deposit cannot be associated with the high-pressure metamorphic events, and, therefore, testifies in favor of the low-pressure nature of maruyamaite. Based on the coincidence of age data for tourmaline crystals with different potassium contents, it can be concluded that the K/Ar system in tourmaline can be used for dating metasomatic and metamorphic processes.
Publisher
Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences
Subject
Earth-Surface Processes,Geophysics,Geology,Economic Geology
Reference39 articles.
1. Berryman E.J., Wunder B., Ertl A., Koch-Muller M., Rhede D., Scheidl K., Giester G., Heinrich W., 2016. Influence of the X-Site Composition on Tourmaline's Crystal Structure: Investigation of Synthetic K-Dravite, Dravite, Oxy-Uvite, and Magnesio-Foitite Using SREF and Raman Spectroscopy. Physics and Chemistry of Minerals 43, 83-102. https:// doi.org/10.1007/s00269-015-0776-3.
2. Berryman E., Wunder B., Rhede D., 2014. Synthesis of K-Dominant Tourmaline. American Mineralogist 99 (2-3), 539-542. DOI:10.2138/am.2014.4775.
3. Berryman E.J., Wunder B., Wirth R., Rhede D., Schettler G., Franz G., Heinrich W., 2015. An Experimental Study on K and NA Incorporation in Dravitic Tourmaline and Insight into the Origin of Diamondiferous Tourmaline from the Kokchetav Massif, Kazakhstan. Contributions to Mineralogy and Petrology 169, 28. https://doi.org/10.1007/s00410-015-1116-9.
4. Borisova E.Yu., Bibikova E.V., Dobrzhinetskaya L.F., Makarov V.A., 1995. Geochronological Study of Zircons, from Granitegneisses of the Kokchetav Diamond-Bearing Area. Doklady Earth Sciences 343 (6), 801-805 (in Russian)
5. Buslov M., Dobretsov N., Vovna G., Kiselev V., 2015. Structural Location, Composition, and Geodynamic Nature of Diamond-Bearing Metamorphic Rocks of the Kokchetav Subduction-Collision Zone of the Central Asian Fold Belt (Northern Kazakhstan). Russian Geology and Geophysics 56 (1-2), 64-80. https://doi.org/10.1016/j.rgg.2015.01.004.
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