The unique Abramovka REE-rich mineralization is a potential source of REE for the Pavlovsk coals deposit (Primorsky Krai, Russia)

Igor Chekryzhov,Elena Vakh,Irina Tarasenko,Sergey Vysotsky,O Chudaev,R Harmon,R Millot,Y Kharaka,O Shouakar-Stash

doi:10.1051/e3sconf/20199801007

Igor Chekryzhov, Elena Vakh + Show 7 more

Open Access

https://doi.org/10.1051/e3sconf/20199801007

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Abstract

The unique REE mineralization of the Abramovka ore occurrence, associated near-surface waters, and REE-rich coals of the Pavlovka basin were studied. The authors, on the base of new isotope-geochemical data and K-Ar dating, suggest that the Abramovka REE minerals (hydrocarbonates, hydrophosphates and hydroxides) formed as a result of interaction of the Palaeozoic metasedimentary and Mesozoic volcanic rocks with near-surface waters. In the Pavlovka metalliferous coals, REE are concentrated predominantly in a humic matter that sorbed REE from water solutions during the peat accumulation stage. A similar distribution of REE in the Abramovka ores, associated near-surface waters, and metalliferous coals of the Pavlovka basin suggest that the Abramovka-type mineralization might be a major source of REE enrichment in the Pavlovka coals.

Highlights

A unique REE-rich (REE > 11%) mineralization was found in the eastern border of the Pavlovka coal-bearing depression (Mikhailovsky District of Primorsky Krai) in an open pit for road fill stones (Abramovsk ore occurrence) [1]
It is confirmed by the geochemical studies of modern water draining the Abramovka occurrence and accumulated at the bottom of its open pit, the regional fresh waters, as well as the coal ash of the Pavlovka deposit
Our study suggests that the rare-earth mineralization of the Abramovka occurrence formed due to dissolution of the rock-forming and ore minerals of the Palaeozoic metasedimentary and Mesozoic volcanogenic rocks by the near-surface waters

Summary

Introduction

A unique REE-rich (REE > 11%) mineralization was found in the eastern border of the Pavlovka coal-bearing depression (Mikhailovsky District of Primorsky Krai) in an open pit for road fill stones (Abramovsk ore occurrence) [1]. This work geochemically compares the Abramovka ores, metalliferous coals of the Pavlovka deposit, and associated near-surface waters to understand if there is a genetic connection between them. The recent exploration drilling showed that the Abramovka REE mineralization did not occur below the near-surface weathering (argillization) zone.

Results

Conclusion