Orlovka, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia

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Located 140 kilometers SE of Chita.

Rhythmic-banded aplite-pegmatoid rocks forming lenses in apical parts of late Jurassic sualkali peraluminous Li-F amazonite granite.
Alternance of quartz-albite aplite, quartz-amazonite, quartz-micas layers and coarse grained quartz-amazonite pegmatoid layers.
The layering is caused by oscillation of physico-chemical parameters during fractional crystallization of the volatile residual saturated Li-F melt together with a liquid immiscibility phenomena.
The parental melt of the banded rocks, NB/Ta-saturated during early stages of crystallization is the consequence of the removal of interstitial residual melt from the deep part of the intrusion and implacement into a previously solidified carapace.


http://www.minsocam.org/MSA/Special/Pig/PIG_articles/Zaraisky.html (Previously published in: Mineral Deposits: Research and Exploration Where do They Meet? Proceedings of the Fourth Biennial SGA Meeting , Turku/Finland/11-13 August 1997 , Heikky Papunen (ed.), A.A. Balkema, Rotterdam, Brookfield, 1997, pp.695-698)and F.G. Reyf et al. , The Canadian Mineralogist, 2000, Volume 38, number 4, Pages 915-936.

Mineral List

Albite var: Oligoclase 'Apatite' Beryl Biotite

Columbite Fluorite Ilmenite Lepidolite Microcline

Microcline var: Amazonite Microlite Group 'Monazite' Muscovite Pyrochlore Group

Quartz Tantalite Topaz Zinnwaldite Zircon

20 entries listed. 12 valid minerals.