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Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin

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Abstract

Application of mineralogy, geochemistry, sedimentary petrology, and sedimentology methods result in better understanding of the genesis and paleoenvironmens of the Upper Cretaceous oceanic red beds exposed in southern Tibet. The red beds comprise the Chungde Formation. Nine lithofacies recognized within this formation are: red foraminiferal packstone/grainstone, red microfossils wackestone, red marlstone with microfossils, red marlstone, red to variegated floatstone and rudstone (debris flow), red shale, red radiolarite, red chert with radiolaria, and red chert. Sedimentary structures and textures, microfossils, and carbonate content show that the Chuangde Fm was deposited near the base of a continental slope in a deep oceanic basin environment, with the basin floor below the carbonate compensation depth (CCD). Red marlstones and limestones intercalated within red shales represent slides and slumps from the upper part of the continental margin. Debris flow and turbidity deposits consist of volcaniclastic, fossilliferous rudstone and floatstone, and very thin calcareous mudstone, intercalated with red shales.

The Upper Cretaceous oceanic red beds in southern Tibet are characterized by high Fe2O3, low FeO, which indicates an oxic diagenetic environment, resulting in precipitation of hematite. The latter occurs as finely, disseminated ferric oxide giving the red color to the rocks. It is concluded that the red beds in southern Tibet were deposited under highly oxygenated bottom conditions in the deep ocean basin. Such conditions not only occurred in a deep ocean basin as indicated by the occurrence of pelagic red shale deposited below the CCD, but also extended up the continental margin as indicated by the presence of red colored marlstones and limestones embedded in the Chuangde Fm. The latter were deposited above CCD, most probably on the continental slope. The oxic bottom conditions are interpreted to be a result of a combination of climate cooling, active bottom ocean circulation, and change in the ocean-atmosphere oxygen budget.

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Authors and Affiliations

  1. State Key Laboratory of Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing, 210093, China

    Hu Xiumian

  2. Geological Centre of the Qinghai-Tibetan Plateau, China University of Geosciences, Beijing, 100083, China

    Wang Chengshan

  3. School of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, China

    Li Xianghui

  4. Department of Earth Sciences, Dalhousie University, Halifax, B3H 3J5, Canada

    Jansa Luba

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  1. Hu Xiumian
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  2. Wang Chengshan
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  3. Li Xianghui
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  4. Jansa Luba
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Correspondence to Hu Xiumian.

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Hu, X., Wang, C., Li, X. et al. Upper Cretaceous oceanic red beds in southern Tibet: Lithofacies, environments and colour origin. SCI CHINA SER D 49, 785–795 (2006). https://doi.org/10.1007/s11430-006-0785-7

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  • DOI: https://doi.org/10.1007/s11430-006-0785-7

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