KMS Nanjing Institute of Geology and Palaeonotology,CAS
Fossils or sedimentary structures? Carbonaceous spheroids from the shale of the Cryogenian Nantuo Formation in Shengnongjia area, South China | |
Ye, Qin1; Tong, Jinnan1; Pang, Ke2,3; Tian, Li1; Hu, Jun1; An, Zhihui4 | |
2020-08-01 | |
发表期刊 | PRECAMBRIAN RESEARCH |
ISSN | 0301-9268 |
卷号 | 345页码:12 |
摘要 | Black shale of the Cryogenian Nantuo Formation, Shennongjia area, South China contains spheroids which co-occur with fossils of macroalgae. These three-dimensional structures occur sparsely as isolated specimens or abundantly as clusters which show different types of boundaries between individuals. They are generally circular on bedding surfaces and elliptical on transecting sections, and range up to several millimeters in diameter. Both petrographic thin sections and scanning electron microscopy (SEM) reveal that these spheroids are mostly organic carbon in composition and exhibit sharp, well-rounded external margins composed of microcrystalline clay minerals. The carbonaceous nature of these spheroids and different elemental abundances between spheroids and matrix are also confirmed by Raman spectroscopy and energy dispersive X-ray spectroscopy (EDS). Organic carbon isotopic values of individual spheroids range from -28.55 parts per thousand to -28.83 parts per thousand, with an average of -28.72 parts per thousand, which show indistinguishable delta C-13(org) values with the surrounding sedimentary matrix but exhibit statistically significant difference to those of contemporaneous macroalgae. A range of physical origins for these spheroids-including concretions, fluid escape structures, raindrop impressions, or bubble impressions-are considered and cannot be entirely rejected. Alternatively, biogenic origin is also a possible interpretation from observations of their morphological, mineralogical, geochemical, and sedimentological characteristics. Although their nature remains unresolved, the documentation of these new carbonaceous spheroids from the Nantuo Formation of Shennongjia area adds to a growing list of fossil-like structure records in the Cryogenian Period. |
关键词 | Carbonaceous spheroids Bubble impressions Biotic origin Cryogenian Nantuo Formation South China |
DOI | 10.1016/j.precamres.2020.105759 |
收录类别 | SCI |
语种 | 英语 |
关键词[WOS] | WATER-ESCAPE STRUCTURES ; EDIACARA-BIOTA ; SNOWBALL EARTH ; EXCEPTIONAL PRESERVATION ; VINDHYAN SUPERGROUP ; MACKENZIE MOUNTAINS ; ELECTRON-MICROSCOPY ; BONAHAVEN FORMATION ; CAP CARBONATES ; TAPHONOMY |
资助项目 | China Geological Survey[1212011120787] ; China Geological Survey[12120114066301] ; Fundamental Research Funds for the Central Universities[CUGCJ1816] ; National Postdoctoral Program for Innovative Talents[BX20180278] ; China Postdoctoral Science Foundation[2018M642946] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[41602007] ; Science Foundation of Jiangsu Province of China[BK20161090] ; State Key Laboratory of Palaeobiology and Stratigraphy[20162109] |
WOS研究方向 | Geology |
WOS类目 | Geosciences, Multidisciplinary |
WOS记录号 | WOS:000538145800005 |
项目资助者 | China Geological Survey ; Fundamental Research Funds for the Central Universities ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; Science Foundation of Jiangsu Province of China ; State Key Laboratory of Palaeobiology and Stratigraphy |
出版者 | ELSEVIER |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/32069 |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Tong, Jinnan |
作者单位 | 1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China 4.Wuhan Inst Geol & Mineral Resources, Wuhan 430223, Peoples R China |
推荐引用方式 GB/T 7714 | Ye, Qin,Tong, Jinnan,Pang, Ke,et al. Fossils or sedimentary structures? Carbonaceous spheroids from the shale of the Cryogenian Nantuo Formation in Shengnongjia area, South China[J]. PRECAMBRIAN RESEARCH,2020,345:12. |
APA | Ye, Qin,Tong, Jinnan,Pang, Ke,Tian, Li,Hu, Jun,&An, Zhihui.(2020).Fossils or sedimentary structures? Carbonaceous spheroids from the shale of the Cryogenian Nantuo Formation in Shengnongjia area, South China.PRECAMBRIAN RESEARCH,345,12. |
MLA | Ye, Qin,et al."Fossils or sedimentary structures? Carbonaceous spheroids from the shale of the Cryogenian Nantuo Formation in Shengnongjia area, South China".PRECAMBRIAN RESEARCH 345(2020):12. |
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