Low-Titanium Lamproites of the Ryabinoviy Massif (Aldan Shield): Crystallization Conditions and Lithospheric Source |
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| Authors: | I F Chayka A E Izokh A V Sobolev V G Batanova |
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| Institution: | 1.Sobolev Institute of Geology and Mineralogy,Siberian Branch of Russian Academy of Science,Novosibirsk,Russia;2.Novosibirsk State University,Novosibirsk,Russia;3.University Grenoble Alpes,Grenoble,France;4.Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Obtained data shows that high-potassic dyke rocks of the Ryabinoviy massif (Central Aldan) belong to low-titanium lamproite series (Mediterranean type) and are distinct with “classic” high-titanium lamproites. Based on Al-in-olivine thermometer, temperature of olivine–chrome-spinel pair crystallization varies in range between 1100 and 1250°C. This suggests lithospheric mantle source for the parental melt and makes role of mantle plume insignificant. High-precision data on olivine composition and bulk rock traceelement composition imply mixed source for the parental melt, consisted of depleted peridotite and enriched domains, originated during ancient subduction. |
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