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  • 1.
    Olsen, Paul E.
    et al.
    Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.
    Sha, Jingeng
    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China.
    Fang, Yanan
    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China.
    Chang, Clara
    Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.
    Kent, Dennis V.
    Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA;Earth & Planetary Sciences, Rutgers University, Piscataway, NJ 08854, USA.
    Vajda, Vivi
    Swedish Museum of Natural History, Department of Paleobiology.
    Whiteside, Jessica
    Geological Sciences, San Diego State University, San Diego, CA 92182, USA.
    Kinney, Sean
    Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.
    Lampert, Alissa
    Malk Partners, 16 W. 22nd St., New York, NY 10010.
    MacLennan, Scott
    School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa.
    Empirical record, geochronology and theoretical determinates of Mesozoic climate in the Junggar Basin, northwest China in relation to other basins in northeast China2024In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 538, no 1Article in journal (Refereed)
    Abstract [en]

    Mesozoic continental basins of northern China, including the Junggar Basin, provide some of the most spectacular and important fossil assemblages in the world, but their climatic and environmental contexts have been shrouded in uncertainty. Here we examine the main factors that determine those contexts: palaeolatitude; the effects of changing atmospheric gases on the radiative balance; and orbitally paced variations in insolation. Empirical evidence on these factors is accumulating rapidly and promises to upend many long standing paradigms. We focus primarily on the Junggar Basin in Xinjiang northwest China with the renowned Shishugou Biota and the basins in Liaoning, Hebei, and Inner Mongolia with their famous Jehol and Yanliao Biotas. Accurate geochronology is necessary for disentangling these various factors and we review the Late Triassic to Early Cretaceous U-Pb ages for these areas and supply one new LA-ICP-MS age for the otherwise un-dated Sangonghe Formation of Early Jurassic age. We review climatic-sensitive facies patterns in North China and show that the climatic context changed synchronously in northwestern and northeastern China consistent with a previously proposed huge Late Jurassic-earliest Cretaceous True Polar Wander (TPW) event with all the major plates of East Asia docked with Siberia and moving together since at least the Triassic, when the north China Basins were at Arctic latitudes. We conclude that this TPW shift is was responsible for the coals and ice rafted debris being produced at high latitudes and the red beds and eolian strata being deposited at low latitudes, within the same basin. The climatic and taphonomic context in which the famous Shishugou, Yanlaio and Jehol biotas preserved was thus a function of TPW as opposed to local tectonics or climate change.

  • 2.
    Peng, Jungang
    et al.
    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China;Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.
    Slater, Sam M
    Swedish Museum of Natural History, Department of Paleobiology.
    Vajda, Vivi
    Swedish Museum of Natural History, Department of Paleobiology. Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.
    A Late Triassic vegetation record from the Huangshanjie Formation, Junggar Basin, China: possible evidence for the Carnian Pluvial Episode2022In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 521, no 1, p. 95-108Article in journal (Refereed)
    Abstract [en]

    The Carnian Pluvial Episode (CPE; c. 234–232 million years ago) is characterized by an accelerated hydrological cycle, global warming and a period of elevated biotic turnover. Using spores and pollen, we reconstruct vegetation and climate changes through a Carnian–Norian (Upper Triassic) interval of the Huangshanjie Formation from the Junggar Basin, China. Four palynofloras were identified, representing distinct vegetation communities. Among these palynofloras, we observed a prominent shift from a conifer-dominated climax forest community, with common ginkgophytes and bennettites, to a fern-dominated community, suggestive of an environmental perturbation. We interpret this change as a regional shift in vegetation, likely caused by increased humidity, consistent with the CPE. Our records represent the first indication of a possible CPE-induced vegetation response in the Junggar Basin and highlight how this event likely affected floral communities of inland Laurasia.

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  • 3.
    Peng, Jungang
    et al.
    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Centre for Excellence in Life and Palaeoenvironment, Chinese Academy of Sciences, Nanjing, China;Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.
    Slater, Sam M.
    Swedish Museum of Natural History, Department of Paleobiology.
    Vajda, Vivi
    Swedish Museum of Natural History, Department of Paleobiology.
    Floral and faunal biostratigraphy of the Middle–Upper Triassic Karamay and Huangshanjie formations from the southern Junggar Basin, China2024In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 538, no 1Article in journal (Refereed)
    Abstract [en]

    In the Junggar Basin, northwestern China, the biostratigraphy and vegetation patterns of the Middle–Late Triassic sediments are comparatively poorly resolved. Here we investigate Middle–Late Triassic successions of the Dalongkou Section in the southern Junggar Basin for palynostratigraphy and vegetation patterns. Three palynological abundance zones are proposed here: the Aratrisporites Abundance Zone (Middle Triassic), the Dictyophyllidites–Aratrisporites Abundance Zone (latest Middle to early Late Triassic) and the Lycopodiacidites–Stereisporites informal abundance zone (Late Triassic). A review of previous records of the Fukangichthys Fauna indicates that this vertebrate fossil assemblage is stratigraphically located within the uppermost part of the Karamay Formation and is Middle Triassic in age. The revised dating of this and other faunas are further used to constrain the palynological zones in the Junggar Basin. Although the palynoflora is consistently dominated by non-striate bisaccate pollen (produced by seed ferns and/or conifers) in the studied section, spores record a distinctive abundance increase during the late Middle Triassic. Spore taxon abundance changes indicate a vegetational shift from a Middle Triassic–early Late Triassic community characterized by abundant lycophytes (likely Annalepis and Pleuromeia) to a Late Triassic ecosystem with abundant dipteridaceous ferns (e.g. Dictyophyllum) in the Junggar Basin and across North China. This study updates the Triassic biostratigraphy in the Junggar Basin, and sheds light on temporal floral changes in this basin and elsewhere in North China during the Middle to Late Triassic.

  • 4. Rantakokko, Nina
    et al.
    Whitehouse, Martin J.
    Swedish Museum of Natural History, Department of Geology.
    Pease, Victoria
    Windley, Brian
    Neoproterozoic evolution of the eastern Arabian basement based on a refined geochronology of the Marbat region, Sultanate of Oman2014In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 392, p. 107-127Article in journal (Refereed)
  • 5.
    Sha, J.
    et al.
    Chinese Academy of Sciences, China.
    Slater, Sam M
    Swedish Museum of Natural History, Department of Paleobiology.
    Vajda, V.
    Swedish Museum of Natural History, Department of Paleobiology.
    Olsen, P. E.
    Lamont-Doherty Earth Observatory of Columbia University, USA.
    Zhang, H.
    Chinese Academy of Sciences, China.
    The Triassic and Jurassic of the Junggar Basin, China: Advances in Palaeontology and Environments2024In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 538, no 1Article in journal (Refereed)
    Abstract [en]

    This volume presents recent advances in our understanding of Mesozoic palaeontology, sedimentology and geochemistry of the Junggar Basin, China. This basin is of particular interest because it provides rare insights into life on the continents from a region that was at high latitudes during the Triassic and Jurassic.

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