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Empirical record, geochronology and theoretical determinates of Mesozoic climate in the Junggar Basin, northwest China in relation to other basins in northeast China
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.ORCID iD: 0000-0002-5852-6326
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China.
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China.
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA.
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2024 (English)In: Geological Society Special Publication, ISSN 0305-8719, E-ISSN 2041-4927, Vol. 538, no 1Article in journal (Refereed) In press
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.

Place, publisher, year, edition, pages
2024. Vol. 538, no 1
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Geology
Identifiers
URN: urn:nbn:se:nrm:diva-5295DOI: 10.1144/sp538-2023-89OAI: oai:DiVA.org:nrm-5295DiVA, id: diva2:1793610
Funder
Swedish Research Council, VR 2019-4061Knut and Alice Wallenberg Foundation, KAW 2020.0145Available from: 2023-09-01 Created: 2023-09-01 Last updated: 2024-01-08Bibliographically approved

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