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

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Presentation transcript:

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

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

LORENTZ et al., 2004

FORELAND FOLD & THRUST BELT LORENTZ et al., 2004

PECHORA ZONE MAFIC COMPLEX

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500 Ma (PEASE, UNPUBLISHED DATA) AGE OF NEOPROTEROZOIC OPHIOLITES ca. 670 Ma (KHAIN ET AL, 1999)

KVARKUSH BLUESCHIST BECKHOLMEN & GLODNY, °C 7-8 Kilobars 540 Ma

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

TECTONIC RECONSTRUCTIONS

REGIONAL OVERVIEW

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

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