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《Acta Sedimentologica Sinica》 2000-04
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Biomarkers and Evolution of Life in Precambrian

SHI Ji yang XIANG Ming ju XU Shi ping (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640)  
Alkanes,isoprenoids,Hopanes,steranes,alkylmethylcyclohexanes and alkylcyclohexanes etc., have been found in the Precambrian rocks with 2.5~8.5 Ga ages in this study. As a result, it seems that the biomarkers found in this study has temporal order to appear in the Precambrian(2.5~0.85 Ga)as the following:isoprenoids hopanes alkanes steranes alkylmethylcyclohexanes alkylcyclohexanes etc.. It has also been demonstrated in this study that isoprenoid may be important monomer to synthesis early life. The fact that C 19 , C 20 isoprenoids were found in early time of Precambrian implies that the anaerobic photoautrophs might be present before 2.5 Ga. As steranes was found in the sample with 2.5 Ga , it was suggested that eukaryotic biota would be appeared before 2.5 Ga. The appearance of C 15 , C 16 isoprenoids and alkylcyclohexane in the Precambrian with 2.3~2.0 Ga may imply that the 2.3~2.0 Ga of Precambrian may be an important period for evolution and diversion of life.
【Fund】: 国家自然科学基金项目!(批准号 :49772 1 2 6)资助
【CateGory Index】: P593
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