Permian-Triassic basalts from basement of the West Siberian basin from superdeep hole Yen-Yakhinskayа SG-7

Abstract

For the first time detailed mineralogical research of the Permo-Triassic basalt core samples of Yen-Yakhinskaya superdeep hole SG-7 from the depths of 7673 m, 8009 m and 8250 m was carried. The composition of minerals investigated. It is shown that the transformation of rock occurred in greenschist and prehnite-pumpellyite metamorphic facies at higher temperatures than today's reservoir temperatures. It is shown the proximity of a series of geochemical features to the samples of the Permo-Triassic basalts from other parts of the West Siberian plate, as well as to the trap basalts of rift phase of the Siberian platform. Isotopic ratios Pb were investigated, in one of the samples a significant effect of the tank PREMA and EM1 was revealed.

Keywords

• Западно-Сибирский бассейн
• доюрский фундамент
• Ен-Яхинская СГ-7
• Сибирская трапповая провинция
• пермотриасовые базальты
• метаморфизм
• геохимия изотопов Pb
• West Siberian Basin
• pre-Jurassic basement
• Yen-Yakhinskaya SG-7
• Siberian Trap Province
• Permian-Triassic basalts
• metamorphism
• geochemistry of Pb isotopes