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Terrestrial paleoenvironment characterization across the Permian–Triassic boundary in South China
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden.
Department of Geosciences, 512 Deike Building, The Pennsylvania State University, University Park, PA 16802, USA.
State Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, People’s Republic of China.
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
2015 (English)In: Journal of Asian Earth Sciences, ISSN 1367-9120, Vol. 98, 225-246 p.Article in journal (Refereed) Published
Abstract [en]

Well-preserved marine fossils in carbonate rocks permit detailed studies of the end-Permian extinction event in the marine realm. However, the rarity of fossils in terrestrial depositional environments makes it more challenging to attain a satisfactory degree of resolution to describe the biotic turnover on land. Here we present new sedimentological, paleontological and geochemical (X-ray fluorescence) analysis from the study of four terrestrial sections (Chahe, Zhejue, Mide and Jiucaichong) in Western Guizhou and Eastern Yunnan (Yangtze Platform, South China) to evaluate paleoenvironmental changes through the Permian–Triassic transition.

Our results show major differences in the depositional environments between the Permian Xuanwei and the Triassic Kayitou formations with a change from fluvial–lacustrine to coastal marine settings. This change is associated with a drastic modification of the preservation mode of the fossil plants, from large compressions to small comminuted debris. Plant fossils spanning the Permian–Triassic boundary show the existence of two distinct assemblages: In the Xuanwei Formation, a Late Permian (Changhsingian) assemblage with characteristic Cathaysian wetland plants (mainly Gigantopteris dictyophylloides, Gigantonoclea guizhouensis, G. nicotianaefolia, G. plumosa, G. hallei, Lobatannularia heinanensis, L. cathaysiana, L. multifolia, Annularia pingloensis, A. shirakii, Paracalamites stenocostatus, Cordaites sp.) is identified. In the lowermost Kayitou Formation, an Early Triassic (Induan)Annalepis–Peltaspermum assemblage is shown, associated with very rare, relictual gigantopterids. Palynological samples are poor, and low yield samples show assemblages almost exclusively represented by spores. A 1 m thick zone enriched in putative fungal spores was identified near the top of the Xuanwei Formation, including diverse multicellular forms, such as Reduviasporonites sp. This interval likely corresponds to the PTB ‘‘fungal spike’’ conventionally associated with land denudation and ecosystem collapse. While the floral turnover is evident, further studies based on plant diversity would be required in order to assess contribution linked to the end-Permian mass extinction versus local paleoenvironmental changes associated with the transition between the Xuanwei and Kayitou formations.

Place, publisher, year, edition, pages
2015. Vol. 98, 225-246 p.
Keyword [en]
Permian–Triassic boundary; Palynology; Biostratigraphy; Mass-extinction; Fungal spike
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
URN: urn:nbn:se:nrm:diva-1394DOI: 10.1016/j.jseaes.2014.11.016OAI: diva2:866807
Swedish Research Council, 2011-7176Swedish Research Council, LUCCI
Available from: 2015-11-03 Created: 2015-11-03Bibliographically approved

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