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Vol 232
Pages:
357
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THE FIRST DATA ON THE U-PB AGE (TIMS AND LA-ICP-MS) OF RUTILE FROM THE ICHETJU POLYMINERAL OCCURRENCE, THE MIDDLE TIMAN

Authors:
S. G. Skublov1
A. O. Krasotkina2
A. B. Makeev3
N. G. Rizvanova4
E. Koiman5
About authors
  • 1 — Institute of Precambrian Geology and Geochronology RAS
  • 2 — Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS
  • 3 — Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS
  • 4 — Institute of Precambrian Geology and Geochronology RAS
  • 5 — Department of Geosciences, the Vegacenter, Swedish Museum of Natural History
Date submitted:
2018-03-12
Date accepted:
2018-05-05
Date published:
2018-08-26

Abstract

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.

10.31897/pmi.2018.4.357
Go to volume 232

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