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首页> 外文期刊>Geological Society of America Bulletin >Age constraints on surface deformation recorded by fossil shorelines at Cape Range, Western Australia
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Age constraints on surface deformation recorded by fossil shorelines at Cape Range, Western Australia

机译：澳大利亚州普罗斯河畔化石海岸线记录的表面变形约束

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摘要

Laterally continuous terraces along the western flank of Cape Range, Western Australia, record both past sea-level highstands and postdepositional vertical displacement. Four distinct fossil coral reef terraces extend nearly the entire length of the slowly uplifting anticlinal structure (similar to 100 km), enabling documentation of the timing and degree of deformation-induced elevation contamination of past sea-level estimates from fossil shorelines. Here, we present detailed elevations of the four terraces using differential global positioning system (DGPS) and airborne light detection and ranging (LiDAR) data sets, along with new ages for the three upper terraces. Geochemical dating using strontium isotope stratigraphy techniques revealed, from highest to lowest elevation: a late Miocene reef terrace, a late Pliocene shoreline, and a prominent mid-Pleistocene reef terrace (probably associated with the marine oxygen isotope stage 33-31 interglacial), along with a broad last interglacial (Eemian) reef terrace and lagoon, which terminate at the modern shoreline. Laterally variable elevation data integrated with newly defined ages for the terraces demonstrate a gradual and continuous relative deformation in the region that spans at least the last 6.5 m.y. and constrains the emergence of the Cape Range to sometime prior to the late Miocene. This data set also shows that the most recent interglacial shoreline has undergone <1.3 m of vertical warping, suggesting minimal deformation since deposition. By tracing relative uplift rates over multiple terraces for similar to 100 km of coastline, we placed constraints on maximum relative sea level (RSL) for the older terraces. Most notably, we were able to place strict maximum RSL elevations of <+34 m on the Pliocene terrace and <+16.5 m on the mid-Pleistocene terrace, with probable RSL being somewhat lower.
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    Sandstrom Michael R.; OLeary Michael J.; Barham Milo; Cai Yue; Rasbury E. Troy; Wooton Kathleen M.; Raymo Maureen E.;

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    Columbia Univ Lamont Doherty Earth Observ 61 Route 9W Palisades NY 10964 USA;

    Univ Western Australia Sch Earth Sci 35 Stirling Highway Perth WA 6009 Australia;

    Curtin Univ Ctr Explorat TargetingCurtin Node Sch Earth &

    Planetary Sci Perth WA 6845 Australia;

    Columbia Univ Lamont Doherty Earth Observ 61 Route 9W Palisades NY 10964 USA;

    SUNY Stony Brook Dept Geosci Stony Brook NY 11794 USA;

    SUNY Stony Brook Dept Geosci Stony Brook NY 11794 USA;

    Columbia Univ Lamont Doherty Earth Observ 61 Route 9W Palisades NY 10964 USA;

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  • 正文语种 eng
  • 中图分类 地质学;
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