Leucitic Rocks of the Urmia Lake Region, Iran
UDC 552.33 : 551.21
https://doi.org/10.15407/mineraljournal.37.02.046
S.G. Kryvdik (1), V.A. Mikhailov (2), V.V. Sharygin (3, 4)
(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680
E-mail: kryvdik@ukr.net
(2) Taras Shevchenko Kyiv National University
90, Vasylkivska Str., Kyiv, Ukraine, 03022
E-mail: vladvam@gmail.com
(3) Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS
3, Acad. Koptyuga Av., Novosibirsk, Russia, 630090
(4) Federal State Budgetary Educational "Novosibirsk State University"
2, Pirogova Str., Novosibirsk, Russia, 630090
E-mail: sharygin@igm.nsc.ru
Leucitic Rocks of the Urmia Lake Region, Iran
Language: Russian
Mineralogical journal 2015, 37 (2): 46-62
Abstract: The large Neogene paleovolcano, containing plagioclase-free rock series: olivine melaleucitites — feldspar leucitites — phonolites — trachytes, is localized near the north-eastern coast of the Urmia (Uruomieh, Orumieh) salt Lake — Islamic Island. Mafic minerals in melaleucitites are represented by magnesian clinopyroxene (Mg# — 90.4) and olivine (Fo87—82), sometimes amphibole, whereas subordinate feldspars — by pure K-feldspar (sanidine) and its Ba-rich species (ВаО — up to 4.0 wt. %). Micas (microphenocrysts, groundmass) in melaleucitites and leucitites are mainly Ba-Ti-rich phlogopites and fluorphlogopites (BaO — up to 12.6, ТіО2 — up to 6.9, F — up to 5.1 wt. %). Nepheline ("Morozewizc" composition) and sodalite (close to ideal compositions) sometimes occur in leucitites as crystal inclusions in clinopyroxene phenocrysts. In phonolites clinopyroxene is richer in FeO (Mg# — 69.4) and phenocrystal phlogopite is essentially poorer in ТіО2 (2.5—2.9), ВаО (0.4—0.8) and F (0.5—0.8 wt. %). Phonolitic feldspars are Na-К-Ba-species (hyalophane, ВаО — up to 8.9 wt. %) and anorthoclase. Leucitic rocks of the Urmia Lake are rich in Ba, Rb, Sr and with moderate Ce, Y, Zr and low Nb. Mineralogical and geochemical features of the Urmia leucitic rocks are very similar to potassic rocks, which are confined to regions of the earth crust compression (folded belts) with active subduction.
Keywords: potassic rocks, Ba-Ti-micas, Na-K-Ba-feldspar, leucitites, phonolites, trachytes.
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