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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Intensifying aeolian activity following the end-Permian mass extinction: Evidence from the Late Permian-Early Triassic terrestrial sedimentary record of the Ordos Basin, North China
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Intensifying aeolian activity following the end-Permian mass extinction: Evidence from the Late Permian-Early Triassic terrestrial sedimentary record of the Ordos Basin, North China

机译：在终点群体灭绝之后加剧了风海洋活动：来自华北鄂尔多斯盆地的已故的二叠代早期三叠纪陆地沉积记录的证据

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摘要

Sedimentary successions provide direct evidence of climate and tectonics, and these give clues about the causes of the mass extinction around the Permian-Triassic boundary. Terrestrial Permian-Triassic boundary strata in the eastern Ordos Basin, North China, include the Late Permian Sunjiagou, Early Triassic Liujiagou and late Early Triassic Heshanggou formations in ascending order. The Sunjiagou Formation comprises cross-bedded sandstones overlaid by mudstones, indicating meandering rivers with channel, point bar and floodplain deposits. The Liujiagou Formation was formed in braided rivers of arid sand bars interacting with some aeolian dune deposits, distinguished by abundant sandstones where diverse trough and planar cross-bedding and aeolian structures (for example, inverse climbing-ripple, translatent-ripple lamination, grainfall and grainflow laminations) interchange vertically and laterally. The Heshanggou Formation is a rhythmic succession of mudstones interbedded with thin medium-grained sandstones mainly deposited in a shallow lacustrine environment. Overall, the sharp meandering to braided to shallow lake sedimentary transition documents palaeoenvironmental changes from semi-arid to arid and then to semi-humid conditions across the Permian-Triassic boundary. The die-off of tetrapods and plants, decreased bioturbation levels in the uppermost Sunjiagou Formation, and the bloom of microbially-induced sedimentary structures in the Liujiagou Formation marks the mass extinction around the Permian-Triassic boundary. The disappearance of microbially-induced sedimentary structures, increasingly intense bioturbation from bottom to top and the reoccurrence of reptile footprints in the Heshanggou Formation reveal gradual recovery of the ecosystem after the Permian-Triassic boundary extinction. This study is the first to identify the intensification of aeolian activity following the end-Permian mass extinction in North China. Moreover, while northern North China continued to be uplifted tectonically from the Late Palaeozoic to Late Mesozoic, the switch of sedimentary patterns across the Permian-Triassic boundary in Shanxi is largely linked to the development of an arid and subsequently semi-humid climate condition, which probably directly affected the collapse and delayed recovery in palaeoecosystems.
机译：沉积次数提供了气候和构造的直接证据，这些是关于围绕二叠系 - 三叠纪边界的质量灭绝的原因的线索。华北华北鄂尔多斯盆地东部的陆生二叠纪 - 三叠纪边界地层包括已故的孙家贵，早期三叠纪刘家沟和初期三叠纪鹤古沟的升序。 Sunjiagou的形成包括由Mudstones覆盖的横向寝具砂岩，表示蜿蜒的河流，带频道，点吧和洪泛区矿床。刘家沟的形成是在干旱砂杆的编织河中形成的，与一些风沙沙丘沉积物相互作用，占有丰富的砂岩，其中各种槽和平面的跨床上用品和天空结构（例如，逆攀岩 - 纹波，翻译 - 纹波层压，灰尘和纹理叠片）垂直和横向交换。 Heshanggou的形成是涉及主要沉积在浅层湖泊环境中的薄膜砂岩的泥石石的节奏连续。总体而言，尖锐的蜿蜒曲折到浅层湖泊沉积过渡文件从半干旱到干旱的古环境变化，然后在二叠纪 - 三叠纪边界上进行半潮湿条件。沉浸式植物和植物的芯片，在最高的孙家沟地层中减少了生物相关水平，并且刘家沟的微生物诱导沉积结构的绽放标志着二叠系三叠系边界周围的质量灭绝。微生物诱导的沉积结构的消失，从底部到顶部和爬行动物占地面积的再次发生的生物相关，在山口沟地层中的爬行动物足迹的再次发表了跨国三叠系边界灭绝后生态系统的逐步回收。本研究是第一个确定在华北地区终点群体濒临灭绝之后的海洋活动的强化。此外，虽然北方华北地区从晚年到后期的中生代持续地抬起，但山西二叠系三叠系边界的沉积图案的开关与干旱和随后半潮湿气候条件的开发有关，较大可能直接影响宫内系统的崩溃和延迟恢复。

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