The first data on the U-Pb age (TIMS AND LA-ICP-MS) of rutile from the Ichetju polymineral occurrence, the Middle Timan
- 1 — Ph.D., Dr.Sci. Chief Researcher Institute of Precambrian Geology and Geochronology RAS
- 2 — RFBR grant executive Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS
- 3 — Ph.D., Dr.Sci. Leading Researcher Institute of Geology of Ore Deposits, Petrology, Mineralogy and Geochemistry RAS
- 4 — Ph.D. Senior Researcher Institute of Precambrian Geology and Geochronology RAS
- 5 — Ph.D. Senior Researcher, Head of the Vegacenter Department of Geosciences, the Vegacenter, Swedish Museum of Natural History
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.
Funding
The work was carried out within the framework of the State Programm IPGG RAS № 0153-2018-0013 and IGEM RAS № 0136-2018-0020 and with the financial support of the Russian Foundation for Basic Research (grant 17-35-50002).We thank Melanie Schmitt for assistance with the LA-ICP-MS measurements. This is Vegacenter publication #005.
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