Fluid regime of the alkaline rock-forming process in the Shibanovsky massif (southern Primorye, Russia)
Stepnova Yu. A., Chashchin A. A., Pakhomova V. A.
Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2015. V. 144. N 2. P. 14-29
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Language: Russian
Abstract
The article analyzes petrographic and mineralogical features of the Shibanovsky massif of alkaline rocks associated with tin-tungsten and rare-earth mineralization. Investigation of ore-forming and accessory minerals has allow to estimate physical-chemical conditions (temperature, alkalinity, water saturation) and the fluid regime of crystallization of the massif rocks: alkaline granites and syenites. In general, alkaline granites were formed in moderate reduction conditions, with moderate water and chlorine, but high fluorine contents in the melt. Pyroxene syenites of the massif were formed under «drier» high-temperature reduction conditions, with moderate F and low Cl contents in the melt. On the contrary, amphibole syenites were crystallized from the melt relatively saturated with water, fluorine and, at some extent, chlorine under more oxidative conditions. Thus, data on the crystallization fluid regime of the Shibanovsky massif provide some information on the metallogenic specification of magmatic complexes.
Key words: alkaline granites, syenites, biotite, titanomagnetite, crystallization conditions, fluid regime.
