Organic Geochemistry of the Fossil-Bearing Phosphorites from Neoproterozoic Doushantuo Formation at Weng'an, South China

Wen Tian Mi; An Qing Chen

doi:10.4028/www.scientific.net/AMR.962-965.156

Paper Titles

The Characteristics of X Formation Biohermal Reservoir in DMP Structure in Sichuan Basin
p.138

The Comparisons of Minerogenetic Condition of the Mengnuo Pb-Zn Deposit and Geochemical Features of Western Area,Weastern Yunnan
p.142

The Development of Coal Reservoir Fracture and its Geological Controls in Zhengzhuang Block, Southern Qinshui Basin, China
p.147

Abundance of Rare Earth Elements and Yttrium in Coals from the Guanbanwusu Mine, Jungar Coalfield, Northern China, and their Geological Implication
p.152

Organic Geochemistry of the Fossil-Bearing Phosphorites from Neoproterozoic Doushantuo Formation at Weng'an, South China
p.156

Permo-Carboniferous Sedimentary Facies Analysis in Northeast Jizhong Depression
p.160

PGE Geochemical Characteristics of the Huangshanxi Magmatic Ni-Cu Sulfide Deposit, East Tianshan, Xinjiang, and its Significance for the Mineralization
p.164

Predicted Enhanced Coalbed Methane Recovery and CO₂ Sequestration in West Henan Province
p.168

Principle and Application of Filtersim Algorithm
p.172

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 962-965Organic Geochemistry of the Fossil-Bearing...

Organic Geochemistry of the Fossil-Bearing Phosphorites from Neoproterozoic Doushantuo Formation at Weng'an, South China

Abstract:

Phosphorites of the uppermost Neoproterozoic Doushantuo Formation were exposed at Weng'an, South China. Here, We report the origin of organic matter and paleoceanographic conditions of the fossil-bearing phosphorites at Weng'an, in terms of sedimentary facies, biomineralization and organic geochemistry, including the biomarker feature. GC-MS analysis showed that a normal alkane distribution pattern with a wide range of carbon atom numbers; Terpane, isoprenoids and steranes were detected in phosphorite. The biomarker implied that the sources of organic matters were the eukaryotes of phototrophic multicellular algae, protests and bacteria. Ph and Pr derivatived from Chlorophyll-a suggested that there may exist a photosynthetic process in palaeoocean. The result shows that phosphorite at Weng 'an generated from biomineralization. In summary, the evidence suggests microorganism were the major contributors to organic matter deposited as part of phosphorite, and exist biomineralization.