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    Eocene-Recent drainage evolution of the Colorado River and its precursor: an integrated provenance perspective from SW California

    Nicholson, U. and Carter, Andrew and Robinson, P. and Macdonald, D.I.M. (2018) Eocene-Recent drainage evolution of the Colorado River and its precursor: an integrated provenance perspective from SW California. In: Corbett, P.W.M. and Hartley, A.J. and Pla-Pueyo, S. and Barreto, D. and Hackney, C. and Kape, S.J. (eds.) River to Reservoir: Geoscience to Engineering. Special Publications 488 488. Geological Society, London. ISBN 9781786203946.

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    Abstract

    The Colorado River in the SW of the USA is one of Earth’s few continental-scale rivers with an active margin delta. Deformation along this transform margin, as well as associated intra-plate strain, has resulted in significant changes in sediment routing from the continental interior and post-depositional translation of older deltaic units. The oldest candidate deposits, fluvial sandstones of the Eocene Sespe Group, are now exposed in the Santa Monica Mountains, 300 km to the north of the Colorado River. Heavy mineral data from this basin indicate that sediment was sourced by a large river system, with some affinity to the early Pliocene Colorado River, but was unlikely to have been integrated across the Colorado Plateau. Sedimentological and mineralogical evidence from the earliest (c. 5.3 Ma) unequivocal Colorado River-derived sediments in the Salton Trough provide evidence for a rapid transition from locally derived sedimentation. Lack of evidence for a precursor phase of suspended-load sediment suggests that drainage capture took place in a proximal position, favouring a ‘top-down’ process of lake spillover. Following drainage integration, significant changes in heavy mineral assemblages of fluvio-deltaic sediments, particularly evident from apatite–tourmaline and garnet–zircon indices, as well as U–Pb ages of detrital zircons, document the integration of the fluvial system to its present form and progressive incision of the Colorado Plateau from the Miocene to the present.

    Metadata

    Item Type: Book Section
    Additional Information: Series ISSN: 0305-8719
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Professor Andrew Carter
    Date Deposited: 11 Feb 2019 14:35
    Last Modified: 11 Feb 2019 14:35
    URI: http://eprints.bbk.ac.uk/id/eprint/26170

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