Mineralogy and genesis of apocarbonate serpentinites of the Pitkäranta mining district, Northern Ladoga region. Part 2. Serpentinites of the Klara ore occurrence.
https://doi.org/10.24930/2500-302X-2025-25-5-1176-1200
Abstract
Research subject. The aposkarn serpentinites of the Klara mine in the Pitkäranta mining district. Aim. Determination of mineral formation environments for serpentinites of the Klara mine. Materials and methods. In total, 45 rock specimens were studied using optical and scanning electron microscopy, electron probe analysis, powder X-ray diffraction, in frared spectroscopy, and differential thermal analysis. Results. Skarn diopside is replaced by antigorite, lizardite, chrysotile and talc, which intergrown in many cases. The forsterite skarn zone is transformed into chrysotile-antigorite serpentinites with humite-group minerals that are replaced by late lizardite. All serpentine is enriched with F; the concentration of this halogen ranges 0.7–1.8 wt % in lizardite from pseudomorphs after diopside and humite-group minerals, 2.1–3.0 wt % in chrysotile-antigorite and antigorite aggregates, and 2.5–4.6 wt % in serpentine filling cracks. Other minerals are represented by magnetite, fluorite, micas of the phlogopite-fluorophlogopite series, annite, chlorites, Mn- and Fe-containing dolomite, fluorapatite, sphalerite, and pyrophanite. Conclusions. Aposkarn serpentinites of the Klara mine were formed during two stages. (1) Predominantly lizardite serpentinites appeared during the late stages of the regressive skarnification process associated with the intrusion of early granites of the Salmi Batholith, as a result of hydration of forsterite and, partly, diopside. (2) The Li-F granite intrusion caused the re-development of the pneumatolyte-hydrothermal process. The influence of ≈300–480°C F-rich fluids led to the replacement of lizardite by antigorite and chrysotile with a high concentration of fluorine. With a subsequent decrease in temperature, late lizardite was formed due to the preserved skarn diopside and minerals of the humite group.
About the Authors
M. O. Bulakh
M.V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Maria O. Bulakh, Geological faculty
I. A. Baksheev
M.V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Ivan A. Baksheev, Geological faculty
V. O. Yapaskurt
M.V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Vasily O. Yapaskurt, Geological faculty
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For citations:
Bulakh M.O., Baksheev I.A., Yapaskurt V.O. Mineralogy and genesis of apocarbonate serpentinites of the Pitkäranta mining district, Northern Ladoga region. Part 2. Serpentinites of the Klara ore occurrence. LITHOSPHERE (Russia). 2025;25(5):1176-1200. (In Russ.) https://doi.org/10.24930/2500-302X-2025-25-5-1176-1200
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