globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12274
Scopus记录号: 2-s2.0-85041129489
论文题名:
Evidence of oxygenic phototrophy in ancient phosphatic stromatolites from the Paleoproterozoic Vindhyan and Aravalli Supergroups, India
作者: Sallstedt T.; Bengtson S.; Broman C.; Crill P.M.; Canfield D.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期:2
起始页码: 139
结束页码: 159
语种: 英语
英文关键词: cyanobacteria ; gas bubbles ; microbial mats ; phosphatization ; phosphorites
Scopus关键词: bacterium ; biostratigraphy ; bubble ; carbon fixation ; cyanobacterium ; fossil record ; microbial mat ; microbialite ; phosphate ; phosphatization ; photoautotrophy ; precipitation (chemistry) ; redox potential ; stromatolite ; Aravalli Range ; India ; Madhya Pradesh ; Rajasthan ; Vindhya Range ; Cyanobacteria ; Rhodophyta
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Fossil microbiotas are rare in the early rock record, limiting the type of ecological information extractable from ancient microbialites. In the absence of body fossils, emphasis may instead be given to microbially derived features, such as microbialite growth patterns, microbial mat morphologies, and the presence of fossilized gas bubbles in lithified mats. The metabolic affinity of micro-organisms associated with phosphatization may reveal important clues to the nature and accretion of apatite-rich microbialites. Stromatolites from the 1.6 Ga Chitrakoot Formation (Semri Group, Vindhyan Supergroup) in central India contain abundant fossilized bubbles interspersed within fine-grained in situ-precipitated apatite mats with average δ13Corg indicative of carbon fixation by the Calvin cycle. In addition, the mats hold a synsedimentary fossil biota characteristic of cyanobacterial and rhodophyte morphotypes. Phosphatic oncoid cone-like stromatolites from the Paleoproterozoic Aravalli Supergroup (Jhamarkotra Formation) comprise abundant mineralized bubbles enmeshed within tufted filamentous mat fabrics. Construction of these tufts is considered to be the result of filamentous bacteria gliding within microbial mats, and as fossilized bubbles within pristine mat laminae can be used as a proxy for oxygenic phototrophy, this provides a strong indication for cyanobacterial activity in the Aravalli mounds. We suggest that the activity of oxygenic phototrophs may have been significant for the formation of apatite in both Vindhyan and Aravalli stromatolites, mainly by concentrating phosphate and creating steep diurnal redox gradients within mat pore spaces, promoting apatite precipitation. The presence in the Indian stromatolites of alternating apatite-carbonate lamina may result from local variations in pH and oxygen levels caused by photosynthesis–respiration in the mats. Altogether, this study presents new insights into the ecology of ancient phosphatic stromatolites and warrants further exploration into the role of oxygen-producing biotas in the formation of Paleoproterozoic shallow-basin phosphorites. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85017
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Paleobiology, Swedish Museum of Natural History, Stockholm, Sweden; Department of Biology, Nordic Center for Earth Evolution (NordCEE) and University of Southern Denmark, Odense, Denmark; Department of Geological Sciences, Stockholm University, Stockholm, Sweden

Recommended Citation:
Sallstedt T.,Bengtson S.,Broman C.,et al. Evidence of oxygenic phototrophy in ancient phosphatic stromatolites from the Paleoproterozoic Vindhyan and Aravalli Supergroups, India[J]. Geobiology,2018-01-01,16(2)
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