Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China
文献类型：期刊论文
| 作者 | Zhang, Xi-Yang; Zheng, Quan-Feng; Li, Yue; Yang, Hong-Qiang; Zhang, Hua2,11; Wang, Wen-Qian; Shen, Shu-Zhong |
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2020 |
| 卷号 | 552页码:109770 |
| 关键词 | Coccoid cyanobacteria Calcified EPS Microbialite End-Permian extinction South China Craton |
| ISSN号 | 1872-616X |
| DOI | 10.1016/j.palaeo.2020.109770 |
| 英文摘要 | Massive occurrences of microbialites near the Permian-Triassic boundary have been interpreted as being due to benthic microbial proliferation in unusual marine conditions after the end-Permian mass extinction. Here, we present large populations of Polybessurus-like microfossils in the microbialites of the South China Craton to reveal their morphological structures, growth patterns, and ecological implications. These distinctive microfossils are composed of layered stalks and spherical endpoints. The spheroids, 20-40 mu m in diameter, comprising external thin micritic walls and internal sparry parts, are interpreted as coccoid cyanobacteria. The stalks consist of multiple "stacked-cup" micritic envelopes consisting of micron-sized magnesian calcite/dolomite grains and are catalogued as calcified remains of coccoid cyanobacterial extracellular polymeric substances (EPS). Early microbially mediated calcification of EPS increased the preservation potential of microfossils. The microfossils stand upright as coccoid unicells supported by the highly unidirectional secretion of EPS, revealing their benthic behaviours. The successively secreted EPS lift the cells away from the substrate, expanding their ecological niches to gain more sunlight for photosynthesis in the barren marine floor. The distinctive Polybessurus-like microfossils can be viewed both in laminae of stromatolites and in spotted/digitate clots of thrombolites, suggesting their critical roles in microbe-dominated reefs in the aftermath of the end-Permian mass extinction. The morphological features and growth patterns of the Polybessurus-like fossils resemble their Proterozoic counterpart-Polybessurus bipartitus Fairchild ex Green et al. (1987). The widespread Polybessurus-like fossils in the Permian-Triassic boundary microbialites of the South China Craton suggest pervasive retrogressive ecosystems on carbonate platforms after the largest extinction event during the Earth's history. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18530]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.[Zheng, Quan-Feng 2.Li, Yue 3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China 4.Nanjing Univ, Sch Earth Sci & Engn, 163 Xianlin Ave, Nanjing 210023, Peoples R China 5.[Wang, Wen-Qian 6.[Zhang, Xi-Yang 7.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Peoples R China 8.[Zhang, Xi-Yang 9.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 511400, Peoples R China 10.[Zheng, Quan-Feng |
| 推荐引用方式 GB/T 7714 | Zhang, Xi-Yang,Zheng, Quan-Feng,Li, Yue,et al. Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,552:109770. |
| APA | Zhang, Xi-Yang.,Zheng, Quan-Feng.,Li, Yue.,Yang, Hong-Qiang.,Zhang, Hua.,...&Shen, Shu-Zhong.(2020).Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,552,109770. |
| MLA | Zhang, Xi-Yang,et al."Polybessurus-like fossils as key contributors to Permian-Triassic boundary microbialites in South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 552(2020):109770. |
入库方式： OAI收割
来源：南海海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。