Full
HUANG Yafei, born in 1994, Ph.D., an engineer, is engaged in researches on sedimentology and stratigraphy, ancient marine environment, and shale gas basic geology. E-mail: hyafei@mail.cgs.cn.
Outline
Ecological evolution varied significantly across different water depth during the Permian-Triassic mass extinction. Shallow-water carbonate platform environments,characterized by low ambient water depth,hosted the majority of benthic organisms and consequently exhibited heightened sensitivity to environmental changes. As such,they provide critical insights into marine ecosystem evolution under disaster scenarios. Although middle to deep-water settings have been extensively studied,research on shallow-marine environments remains limited. This paper focuses on the newly identified Panjiazhuang section,a shallow-water carbonate platform succession in the Changxing area of Zhejiang Province,and integrates sedimentological,paleontological,and isotopic geochemical analyses to reconstruct ecosystem evolution across the Permian-Triassic transition. In the Panjiazhuang section,a major extinction event is recorded at the top of the bioclastic limestone within the upper Permian Changxing Formation. This interval coincides with a distinct shift in microfacies—from foraminifera-and algae-rich bioclastic limestone to microbialite—indicating a rapid proliferation of cyanobacteria following the collapse of metazoan communities. Additionally,the inorganic carbon isotope exhibited a notable negative excursion during this time. The findings indicate that the ecosystem transition from bioclastic limestone to microbialite facies at the Paleozoic-Mesozoic boundary in the Panjiazhuang section represents a single-episode extinction process during the Permian-Triassic mass extinction event.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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