Mineralogy, geochemistry and age of metacarbonate-silicate rocks of the Ilmenogorsky complex
https://doi.org/10.24930/1681-9004-2019-19-1-92-110
Abstract
Research subject. This paper presents the results of a series of mineralogical, petrological, geochemical and isotopechronological studies carried out to investigate metacarbonatesilicate rocks in the area of Ishkul Lake, the Ilmenogorsky complex.
Materials and methods. The microprobe analysis of the composition of minerals was performed using a REMMA202M scanning microscope equipped with a microanalyzer. The content of major, trace and rareearth elements (REE) was determined using a mass spectrometer ICPMS. The UPb age of zircons was obtained by a microprobe SHRIMP II. The content of REE in zircons was determined by an ion probe CAMECA IMS4F.
Results. The studied metacarbonatesilicate rocks are shown to be represented by spinelforsteritecalcite, diopsidescapolitecalcite and clinopyroxenite varieties with a di verse range of minerals, including diopside, calcite, forsterite, spinel, scapolite, anorthite, enstatite, alumoenstatite, augite, fassaite, tschermakite, pargasite, hornblend, tremolite, bariumcontaining feldspar, celsian, phlogopite, graphite, titanite, fluorapatite, picroilmenite, pyrrhotite, pentlandite, sphalerite, violarite, gersdorffite, maucherite. In terms of petrochemical properties, the metacarbonatesilicate rocks under study are characterized by significant variations in the content of SiO2, CaO, MgO at a Ca/Mg ratio of 1.4–8.2, as well as by increased Ni and Cr content, low ratios of Sr/Ba, Th/U, Zr/Hf and Nb/Ta. The small ΣREE amounts of 6–25 ppm (rarely up to 70–72 ppm) correspond to sedimentary formations with a significant amount of ultrabasic material.
Conclusions. The specific features of the composition of olivine, spinel, ilmenite, as well as the titanium content in the early generation zircon indicate the formation (transformation) of spinelforsteritecalcite rocks at t = 830–850°C. According to the established specifics of REE distribution and the Th/U ratio, the early generation zircons refer to the granulite type zircons, while the late generation zircons correspond to those of transformed syenitesmiaskites and various metasomatites. The formation (transformation) of the rocks is found to correspond to the following age stages: PR1 (1720–1780 Ma) “granulite” metamorphism; D1–C (345–399 Ma) – metasomatic transformations caused by the formation of alkaline rocks associated with rifting processes; P1 (282 Ma) – tectonicmetasomatic transformations caused by shear processes.
About the Authors
P. M. Valizer
Ilmen State Reserve
Russian Federation
Miass 456317
Russian Federation
Miass 456317
S. V. Cherednichenko
Ilmen State Reserve
Russian Federation
Miass 456317
Russian Federation
Miass 456317
A. A. Krasnobaev
A.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS,
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620016
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620016
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Review
For citations:
Valizer P.M., Cherednichenko S.V., Krasnobaev A.A. Mineralogy, geochemistry and age of metacarbonate-silicate rocks of the Ilmenogorsky complex. LITHOSPHERE (Russia). 2019;(1):92-110. (In Russ.) https://doi.org/10.24930/1681-9004-2019-19-1-92-110
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