Sequence stratigraphy in active extensional basins: implications for the interpretation of ancient basin-fills

作者: Robert L. Gawthorpe , Alastair J. Fraser , Richard E.Li. Collier

DOI: 10.1016/0264-8172(94)90021-3

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摘要: Abstract Systematic variations in sequences, their component units and stacking patterns exist within rift basins. These can be related to displacement gradients associated with the large-scale (12–50 km) segmentation of normal fault zones, which control accommodation, sediment supply basin physiography. Sediment is also strongly influenced by nature pre-rift drainage networks bedrock lithology. High rates hangingwall subsidence close centre segments may cancel out effects glacio-eustatic sea-level fall, so that accommodation development normally characterized continual addition new space. The resulting sequences lack type 1 sequence boundaries lowstand systems tracts, stack into aggradational sets. adjacent footwall subject uplift, lead subaerial exposure incision, generating a composite boundary. Away from zone near segment boundaries, slip are much lower hence relative change dominated eustasy. Here, falls sea level important, sequences. Sequence reflect not only eustasy local fault-controlled subsidence, but interaction these uplifting footwalls and/or regional uplift. Tectonic influence on will more pronounced during greenhouse times than icehouse times.

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