Геодинамика и тектонофизика (Mar 2020)

THERMAL HISTORY OF THE GULI PLUTON (NORTH OF THE SIBERIAN PLATFORM) ACCORDING TO APATITE FISSION-TRACK DATING AND COMPUTER MODELING

  • M. S. Myshenkova,
  • V. A. Zaitsev,
  • S. Thomson,
  • A. V. Latyshev,
  • V. S. Zakharov,
  • T. E. Bagdasaryan,
  • R. V. Veselovsky

DOI
https://doi.org/10.5800/GT-2020-11-1-0464
Journal volume & issue
Vol. 11, no. 1
pp. 75 – 87

Abstract

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We present the first results of fission-track dating of apatite monofractions from two rock samples taken from the Southern carbonatite massif of the world’s largest alkaline ultrabasic Guli pluton (~250 Ma), located within the Maymecha-Kotuy region of the Siberain Traps. Based on the apatite fission-track data and computer modeling, we propose two alternative model of the Guli pluton's tectonothermal history. The models suggest (1) rapid post-magmatic cooling of the studied rocks in hypabyssal conditions at depth about 1.5 km, or (2) their burial under a 2-3 km thick volcano-sedimentary cover and reheating above 110°C, followed by uplift and exhumation ca. 218 Ma.

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