Late Archaean synorogenic basins of the Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia: Part III. Signatures of tectonic escape in an arc-continent collision zone

摘要: Abstract Siliciclastic supersequences in the Eastern Goldfields Superterrane are remnants of basins that were linear zones subsidence between intra-terrane faults. Fluvial deposits record proximal to medial braid-plains. Deep-marine canyon and fan linked across compartments only by mud-rich deposits. Axial depositional systems dominate, with minor evidence for slope-aprons, although transverse axial preserved some fluvial Basin development occurred during two stages separated an inversion event, Kalgoorlie Terrane recording change from a deep-marine basin Kurnalpi distal facies tracts. Sparse palaeocurrents establish uplift north controlled sediment dispersal. Lithofacies stacking is aggradational, whereas abrupt upwards-change tracts back-stepping within sequences, depositional-sequence sets, but forward-stepping sequences. The stratigraphic architecture atypical synorogenic consistent strike-slip regime characterised pulsed uplift-subsidence, steady-state lengthening subsidence, punctuating catastrophic lengthening, tectonic anchoring. interpreted have been similar graben half-graben Western Anatolian extensional province Turkey, developing adjacent strike-slip, oblique-slip or normal dip-slip Controls on patterns considered regional rather than at scale each basin. envisaged setting projected collision Philippine Archipelago west Fault continental crust South China Sea, orogenic accreted superterranes Canadian Cordillera. Interpreted north- northwest-convergence Burtville east ancestral Yilgarn continent northwest produced south-propagating orogen, Kalgoorlie, Gindalbie, Terranes trapped tectonic-escape corridor. Tectonic escape south bounding faults simulated was response uplift.