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TIMANIAN OROGENY AND LATE NEOPROTEROZOIC SUBDUCTION

TIMANIAN OROGENY AND LATE NEOPROTEROZOIC SUBDUCTION. V. PEASE, STOCKHOLM UNIVERSITY. EXTENT OF TIMANIAN OROGENY. PEASE et al., IN PRESS. GEOMETRY OF TIMANIAN OROGENY. FORELAND BASIN. FORELAND BASIN. GRAZDANKIN, 2004; MARTIN et al., 2000. LORENTZ et al., 2004. FORELAND FOLD & THRUST BELT.

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TIMANIAN OROGENY AND LATE NEOPROTEROZOIC SUBDUCTION

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  1. TIMANIAN OROGENY AND LATE NEOPROTEROZOIC SUBDUCTION V. PEASE, STOCKHOLM UNIVERSITY

  2. EXTENT OF TIMANIAN OROGENY PEASE et al., IN PRESS

  3. GEOMETRY OF TIMANIAN OROGENY

  4. FORELAND BASIN

  5. FORELAND BASIN GRAZDANKIN, 2004; MARTIN et al., 2000

  6. LORENTZ et al., 2004

  7. FORELAND FOLD & THRUST BELT LORENTZ et al., 2004

  8. LORENTZ et al., 2004

  9. PECHORA ZONE MAFIC COMPLEX

  10. HINTERLAND REGIONAL UNCONFORMITY & RETURN TO PASSIVE MARGIN • AGE OF OVERLYING • SEDIMENTS <500 Ma • (PEASE, UNPUBLISHED DATA) • AGE OF NEOPROTEROZOIC • OPHIOLITES ca. 670 Ma • (KHAIN ET AL, 1999)

  11. KVARKUSH BLUESCHIST • 350-400°C • 7-8 Kilobars • 540 Ma BECKHOLMEN& GLODNY, 2005

  12. TIMANIAN OROGENESIS ONSET? ±600 Ma PEAK METAMORPHISM? ±550 Ma (REGIONAL P/T 600°C, 25-28 KM) STRUCTURAL STYLE? NW-STRIKING, SW-THRUSTING, OCEAN/ARC- CONTINENT COLLISION END? 500 Ma

  13. TECTONIC RECONSTRUCTIONS

  14. REGIONAL OVERVIEW

  15. CRITERIA FOR SUBDUCTION TECTONICS • OPHIOLITES • BLUESCHISTS • UHP METAMORPHISM NO SMOKING GUN, BUT….. STERN, 2005

  16. THE NEOPROTEROZOIC TIMANIDE OROGEN OF EASTERN BALTICA eds. GEE & PEASE GEOL. SOC. LONDON MEMOIR 30, 2004 * * *

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