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    Stratigraphy and provenance of the Paleogene syn-rift sediments in central-southern Palawan: paleogeographic significance for the South China margin

    Chen, W.H. and Tan, Y. and Carter, Andrew and Huang, C.Y. and Yumul, G.P. and Dimalanta, C.B. and Aira, J. and Gabo-Ratio, S. and Wang, M.H. and Chen, D. and Shan, Y. and Zhang, X.C. and Liu, W. (2021) Stratigraphy and provenance of the Paleogene syn-rift sediments in central-southern Palawan: paleogeographic significance for the South China margin. Tectonics 40 (e2021T), ISSN 0278-7407. (In Press)

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    Abstract

    The Palawan microcontinental block is thought to have separated from the South China margin due to seafloor spreading and opening of the South China Sea. However, it is uncertain when and from which section the Palawan microcontinental block rifted from the South China margin, and little is known about sediment routing across the rifted margin before continental breakup. To address these aspects we studied the biostratigraphy and provenance of syn-rift sedimentary rocks collected from the Panas-Pandian Formation in central-southern Palawan. Micropaleontological evidence indicates a Middle Eocene–earliest Oligocene (47.7–32.9 Ma) age for the Panas-Pandian Formation. Based on this and the oldest age of the post-rift Nido Limestone (~32 Ma), the breakup unconformity on the Palawan microcontinent block is dated around 33–32 Ma. This timing of breakup unconformity is close to that of the Pearl River Mouth Basin (~30 Ma) and IODP Site U1435 (~34Ma), suggesting the conjugate relationship between the Palawan microcontinental block and the Pearl River Mouth Basin. Trace fossils and benthic foraminifera from the Panas-Pandian Formation indicate a middle bathyal to abyssal environment on the continental slope of the South China margin. Multidisciplinary provenance analysis reveals that the Panas-Pandian Formation was derived from both local Mesozoic basement uplifts and the interior Cathaysia Block. It indicates that a paleo-Pearl River has been established at least since the Middle Eocene (47.7– 42.1 Ma) and could deliver sediments from the interior Cathaysia Block to the continental slope, across the wide rifted margin with a low topographic gradient

    Metadata

    Item Type: Article
    Additional Information: Accepted for publication. Copyright American Geophysical Union. Further reproduction or electronic distribution is not permitted.
    School: School of Science > Earth and Planetary Sciences
    Research Centres and Institutes: Earth and Planetary Sciences, Institute of
    Depositing User: Andy Carter
    Date Deposited: 26 Aug 2021 14:22
    Last Modified: 26 Aug 2021 17:59
    URI: https://eprints.bbk.ac.uk/id/eprint/45496

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