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Palaeoenvironmental reconstruction and biostratinomic analysis of the jurassic Yanliao Lagerst?tte in northeastern China-a case study

Palaeoenvironmental reconstruction and biostratinomic analys...

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2018年中国地球科学联合学术年会

作者：杨子潇王盛宇田庆奕王博 Manja Hethke Maria E.McNamara Michael J.Benton 徐星姜宝玉南京大学地球科学与工程学院中国科学院南京地质古生物研究所 Freie Universit?t Berlin University College Cork University of Bristol 中国科学院古脊椎动物与古人类研究所

The middle–Upper jurassic Yanliao Lagerst?tte contains numerous exceptionally preserved fossils of aquatic and land organisms, including salamanders, dinosaurs, pterosaurs and mammaliaforms. Despite extensive study of the diversity and evolutionary implications of the biota, the palaeoenvironmental setting and taphonomy of the fossils remain poorly understood. In this study, we reconstruct both the palaeoenvironment of the Daohugou locality(one of the most famous Yanliao localities), and the biostratinomy of the fossils. We use high-resolution data from field investigation and excavations to document in detail the stratigraphic succession, lithofacies, facies associations, and biostratinomic features of the Lagerst?tte. Our results show that frequent volcanic eruptions generated an extensive volcaniclastic apron and lake(s) in this region. The frequent alternation of thin lacustrine deposits and thick volcaniclastic apron deposits reflects either that the studied area was located in the marginal regions of a single lake, where the frequent influx of volcaniclastic apron material caused substantial fluctuations in lake area and thus the frequent lateral alternation of the two facies, or that many comparatively short-lived lakes developed on the volcaniclastic apron. Most terrestrial insects are preserved in the laminated, normally graded siltstone, claystone and tuff that forms many thin intervals with deposits of graded sandstone, siltstone and tuff in between. Within each interval the terrestrial insects occur in many laminae associated with abundant aquatic organisms, but are particularly abundant in some laminae that directly underlie tuff of fallout origin. Most of these terrestrial insects are interpreted to have been killed in the area adjacent to the studied palaeolake(s) during volcanic eruptions. Their carcasses were transported by influxes of fresh volcaniclastic material, primarily meteoric runoff and possibly minor distal pyroclastic flow into the palaeo

关键词： Palaeolake Volcanism Taphonomy Ecosystem middle–late jurassic Yanliao Biota

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