期刊
SCIENCE IN CHINA SERIES D-EARTH SCIENCES
卷 45, 期 3, 页码 193-200出版社
SCIENCE CHINA PRESS
DOI: 10.1360/02yd9021
关键词
dinosteranes; triaromatic dinosteroids; 24-norcholestane; dinoflagellate; diatom; Cambrian; Tarim Basin
Dinosteranes and 4-methyl-24-ethylcholestanes are usually to be thought of as biomarkers for dinoflagellates, and 24-norcholestanes and C-28 steranes for diatom. Therefore, the highest concentrations of these compounds are typically found in strata deposited since the beginning of the Mesozoic. However these compounds appeared widely and abundantly in extracts from organic-rich sediments in the Sinian and Cambrian of the Tarim Basin. This suggests that some of the planktonic algae such as dinoflagellates and diatoms have an earlier origin than the Mesozoic. Some of the remarkable algal fossils observed in the Cambrian, in both well He 4 and the outcrop section of Xiao-Er-Bulak, Tarim Basin, provide possible biological evidence for this kind of inference.
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