A thermophilous and arid-tolerant flora from the Lower Jurassic of Junggar Basin, Xinjiang, NW China, corresponding to the Toarcian Oceanic Anoxic Event
| Autor: | Shenghui Deng, Xiaoju Yang, Yuanzheng Lu, Jingeng Sha |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Geological Society, London, Special Publications. 538 |
| ISSN: | 2041-4927 0305-8719 |
| Popis: | Twenty taxa of fossil plants are described from the Sangonghe Formation (Lower Jurassic) of the Haojiagou section in the Junggar Basin, Xinjiang, NW China. The Sangonghe flora consists of Equisetales, ferns, bennettitaleans, ginkgoes, conifers and gnetales, but is dominated by ferns. It is a low species diversity but extraordinary flora for having a high proportion (45%) of thermophilous or arid-tolerant (xerophilous) elements, by comparing with 0% in the underlying Badaowan Formation and around 2% in the overlying Xishanyao Formation. These thermophilous or arid-tolerant (xerophilous) elements include Marattiopsis asiatica Kawasaki, Phlebopteris polypodioides Brongniart and Dictyophyllum sp. (ferns) , Otozamites leckenbyi Harris, Otozamites sp. , Zamites sp. and Dictyozamites sp. (bennettitaleans), Brachyphyllum ( Hirmeriella ?) sp. (conifers) and Cadmisega ephedroides Krassilov et Bugdaeva (gnetales). Based on the geological ranges of the known species and comparisons with the coeval floras in Eurasia, the age of the Sangonghe flora is Toarcian of the Early Jurassic. The flora reveals a climatic warming and aridification event, which occurred during the Toarcian in the Junggar Basin. Palaeontological (including palaeobotanical and palynological), sedimentological and geochemical data demonstrate that warming and aridification occurred widely across the north of China during the Toarcian, and this might be the response of the terrestrial ecosystem to the Toarcian Oceanic Anoxic Event (T-OAE). |
| Databáze: | OpenAIRE |
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