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A. O. Krasotkina
A. O. Krasotkina
Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS
Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS

Articles

Geology
  • Date submitted
    2022-03-14
  • Date accepted
    2022-05-13
  • Date published
    2022-07-26

Unique titanium Deposits of Timan: genesis and age issues

Article preview

The article critically analysesthe hypotheses about the formation, age, and sources of material of large Timan titanium deposits, which were previously considered ancient buried placers formed along the weathering crusts of the Riphean shales. We discuss an alternative hydrothermal-metamorphic hypothesis about the formation of these deposits and the source of ore material. It is established that the incoming zircon of different ages (570-3200 Ma), as well as two other geochronometers, rutile and monazite, underwent a thermal effect common for all varieties as a result of a hydrothermal process about 600 Ma ago. According to modern concepts, the closing temperature of the U-Pb system in rutile exceeds 500 °С, which suggests high-temperature conditions for the hydrothermal processing of rutile during the formation of the considered deposits in the Riphean.

How to cite: Makeyev A.B., Bryanchaninova N.I., Krasotkina A.O. Unique titanium Deposits of Timan: genesis and age issues // Journal of Mining Institute. 2022. Vol. 255. p. 275-289. DOI: 10.31897/PMI.2022.32
Geology
  • Date submitted
    2018-03-12
  • Date accepted
    2018-05-05
  • Date published
    2018-08-26

THE FIRST DATA ON THE U-PB AGE (TIMS AND LA-ICP-MS) OF RUTILE FROM THE ICHETJU POLYMINERAL OCCURRENCE, THE MIDDLE TIMAN

Article preview

A study on the U-Pb age of rutile from the Ichetju polymineral occurrence has been done for the first time by LA-ICP-MS and TIMS methods. It was established that rutile originates from various sources with different ages (presumably, ca. 1000, 1660, 1860 and 1980 Ma), but all the rutile types have undergone a common thermal event at ca . 580 Ma. Obtained results are consistent with U-Pb zircon data for the Ichetju occurrence and the Pizhemskoe deposit. According to modern concepts, the closure temperature for the U-Pb system in rutile is higher than 500  ° С, which suggests fairly high-temperature conditions of the rutile hydrothermal transformation during the formation of the deposits in Riphean. Obviously, a placer hypothesis of formation of titanium deposits of the Middle Timan which is supported by a number of researchers does not explain such temperature of rutile alteration.

How to cite: Skublov S.G., Krasotkina A.O., Makeev A.B., Rizvanova N.G., Koiman E. THE FIRST DATA ON THE U-PB AGE (TIMS AND LA-ICP-MS) OF RUTILE FROM THE ICHETJU POLYMINERAL OCCURRENCE, THE MIDDLE TIMAN // Journal of Mining Institute. 2018. Vol. 232. p. 357. DOI: 10.31897/PMI.2018.4.357