Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China
The Late Triassic deposits of the Sichuan Basin, southwestern China are significant for hosting abundant and diverse fossil assemblages including plants (containing spores and pollen), bivalves and insects. However, the Late Triassic palaeoecological variations are still poorly documented in this re...
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CAMBRIDGE UNIV PRESS
2018
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Online Access: | http://ir.nigpas.ac.cn/handle/332004/16903 http://ir.nigpas.ac.cn/handle/332004/16904 https://doi.org/10.1017/S0016756817000735 |
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ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/16904 2023-05-15T16:03:53+02:00 Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China Li, Liqin (李丽琴) Wang, Yongdong (王永栋) Vajda, Vivi Liu, Zhaosheng 2018-11-01 http://ir.nigpas.ac.cn/handle/332004/16903 http://ir.nigpas.ac.cn/handle/332004/16904 https://doi.org/10.1017/S0016756817000735 英语 eng CAMBRIDGE UNIV PRESS GEOLOGICAL MAGAZINE http://ir.nigpas.ac.cn/handle/332004/16903 http://ir.nigpas.ac.cn/handle/332004/16904 doi:10.1017/S0016756817000735 End-triassic Event Palynology Mass Extinction Sporomorph Ecogroup Climate Change Atlantic Magmatic Province In-situ Spores Large Igneous Provinces Jurassic Boundary Triassic/jurassic Boundary East Greenland Ocean Acidification Fertile Organs Northwestern China Geology Geosciences Multidisciplinary 期刊论文 2018 ftchinacscnigpas https://doi.org/10.1017/S0016756817000735 2019-09-27T00:06:40Z The Late Triassic deposits of the Sichuan Basin, southwestern China are significant for hosting abundant and diverse fossil assemblages including plants (containing spores and pollen), bivalves and insects. However, the Late Triassic palaeoecological variations are still poorly documented in this region. Here we present results from a palynological study from the Upper Triassic Xujiahe Formation in Hechuan of Chongqing, southern Sichuan Basin. The palynological analysis revealed a well-preserved terrestrial palynoflora of high diversity, comprising 184 species in 75 genera of spores and pollen. Three palynological assemblages were recognized, reflecting terrestrial successions throughout the entire interval with significant changes in the vegetation. Cycads/bennettites/ginkgophytes and conifers show an increasing trend into younger deposits, while ferns and lycopsids decrease in relative abundance. The Late Triassic vegetation underwent changes from lowland fern forest to a mixed forest with more canopy trees. We applied the Spore-pollen Morphological Group (SMG) method and Sporomorph EcoGroup (SEG) model to interpret the palaeoclimate features. The results reveal that the lower part of the Xujiahe Formation was deposited under relatively warm and humid conditions with an overall cooling and drying trend from latest Norian to Rhaetian time, accompanied by a general decrease of ferns and simultaneous increase of gymnosperms, and a decline in diversity of miospores. This study presents data on variations within the terrestrial ecosystem prior to the end-Triassic extinction event in the Sichuan Basin, and therefore provides important information for understanding the changes in the vegetation preceding the end-Triassic event. Report East Greenland Greenland Ocean acidification Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) Greenland Geological Magazine 155 8 1793 1810 |
institution |
Open Polar |
collection |
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacscnigpas |
language |
English |
topic |
End-triassic Event Palynology Mass Extinction Sporomorph Ecogroup Climate Change Atlantic Magmatic Province In-situ Spores Large Igneous Provinces Jurassic Boundary Triassic/jurassic Boundary East Greenland Ocean Acidification Fertile Organs Northwestern China Geology Geosciences Multidisciplinary |
spellingShingle |
End-triassic Event Palynology Mass Extinction Sporomorph Ecogroup Climate Change Atlantic Magmatic Province In-situ Spores Large Igneous Provinces Jurassic Boundary Triassic/jurassic Boundary East Greenland Ocean Acidification Fertile Organs Northwestern China Geology Geosciences Multidisciplinary Li, Liqin (李丽琴) Wang, Yongdong (王永栋) Vajda, Vivi Liu, Zhaosheng Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
topic_facet |
End-triassic Event Palynology Mass Extinction Sporomorph Ecogroup Climate Change Atlantic Magmatic Province In-situ Spores Large Igneous Provinces Jurassic Boundary Triassic/jurassic Boundary East Greenland Ocean Acidification Fertile Organs Northwestern China Geology Geosciences Multidisciplinary |
description |
The Late Triassic deposits of the Sichuan Basin, southwestern China are significant for hosting abundant and diverse fossil assemblages including plants (containing spores and pollen), bivalves and insects. However, the Late Triassic palaeoecological variations are still poorly documented in this region. Here we present results from a palynological study from the Upper Triassic Xujiahe Formation in Hechuan of Chongqing, southern Sichuan Basin. The palynological analysis revealed a well-preserved terrestrial palynoflora of high diversity, comprising 184 species in 75 genera of spores and pollen. Three palynological assemblages were recognized, reflecting terrestrial successions throughout the entire interval with significant changes in the vegetation. Cycads/bennettites/ginkgophytes and conifers show an increasing trend into younger deposits, while ferns and lycopsids decrease in relative abundance. The Late Triassic vegetation underwent changes from lowland fern forest to a mixed forest with more canopy trees. We applied the Spore-pollen Morphological Group (SMG) method and Sporomorph EcoGroup (SEG) model to interpret the palaeoclimate features. The results reveal that the lower part of the Xujiahe Formation was deposited under relatively warm and humid conditions with an overall cooling and drying trend from latest Norian to Rhaetian time, accompanied by a general decrease of ferns and simultaneous increase of gymnosperms, and a decline in diversity of miospores. This study presents data on variations within the terrestrial ecosystem prior to the end-Triassic extinction event in the Sichuan Basin, and therefore provides important information for understanding the changes in the vegetation preceding the end-Triassic event. |
format |
Report |
author |
Li, Liqin (李丽琴) Wang, Yongdong (王永栋) Vajda, Vivi Liu, Zhaosheng |
author_facet |
Li, Liqin (李丽琴) Wang, Yongdong (王永栋) Vajda, Vivi Liu, Zhaosheng |
author_sort |
Li, Liqin (李丽琴) |
title |
Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
title_short |
Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
title_full |
Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
title_fullStr |
Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
title_full_unstemmed |
Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China |
title_sort |
late triassic ecosystem variations inferred by palynological records from hechuan, southern sichuan basin, china |
publisher |
CAMBRIDGE UNIV PRESS |
publishDate |
2018 |
url |
http://ir.nigpas.ac.cn/handle/332004/16903 http://ir.nigpas.ac.cn/handle/332004/16904 https://doi.org/10.1017/S0016756817000735 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Ocean acidification |
genre_facet |
East Greenland Greenland Ocean acidification |
op_relation |
GEOLOGICAL MAGAZINE http://ir.nigpas.ac.cn/handle/332004/16903 http://ir.nigpas.ac.cn/handle/332004/16904 doi:10.1017/S0016756817000735 |
op_doi |
https://doi.org/10.1017/S0016756817000735 |
container_title |
Geological Magazine |
container_volume |
155 |
container_issue |
8 |
container_start_page |
1793 |
op_container_end_page |
1810 |
_version_ |
1766399575838425088 |