THERMAL EVOLUTION OF THE SIBERIAN TRAPS LARGE IGNEOUS PROVINCE BASED ON RESULTS OF APATITE FISSION-TRACK ANALYSIS AND OTHER GEOCHRONOLOGICAL DATA FROM INTRUSIVE COMPLEXESтезисы докладаТезисы
Аннотация:We present results of apatite fission-track (AFT) and other geochronological data (apatite U-Pb (LA-MC-ICPMS) and Rb-Sr dating) from several intrusions located within the Siberian Traps Large Igneous Province. The obtained AFT ages are distributed between ca. 207 and ca. 173 Ma. We interpret the AFT ages as a consequence of sedimentary burial of the studied magmatic complexes to below the closure temperature of the AFT system, which took place after the formation of intrusions ca. 252-250 Ma. Later cooling as a result of exhumation of the studied rocks to near surface temperatures and decreasing of thermal flow then took place in the Late Triassic-Early Jurassic.
