| 江西九江红土生物标志化合物的分布特征及其古气候环境意义 |
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| 关键词:vermicular red earth biomarkers paleoclimate paleo-environment Jiujiang of Jiangxi |
| 基金项目:国家自然科学基金(编号: 41877297);国家973计划项目(编号: 2011CB710601) |
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| 摘要: |
| Characteristics of Biomarkers in Pleistocene Red Earth of Jiujiang, Jiangxi Province and Its Paleoclimatic and Environmental Significance |
| In order to get information on paleoclimate and paleo-environment which is recorded in laterite strata of Jiujiang, Jiangxi Province, the authors, on the basis of investigation and analysis of field landform, lithology and related sedimentary environment in laterite profile, studied biomarkers including n-alkanes, n-alkanoic acids and some other factors by means of GC-MS, in which the source and distribution characteristics of their carbon number was emphatically analyzed. The results show that both values of CPI and ∑C21–/∑C22+ of n-alkanes and value CPIL of n-alkanoic acids in homogeneous red soil located in the upside of the laterite profile in Jiujiang of Jiangxi Province are higher than those of the downside vermicular red soil and exhibit obvious fluctuations, which indicates that vermicular red soil was formed in a warm and wet climate compared with the upper homogeneous red soil, reflecting an extreme warm and wet period in middle Pleistocene; ∑C21–/∑C22+, (C15+C17+C19)/(C27+C29+C31), (C16+C17+C18)/(C29+C31+C33) and C17/C31 of n-alkanes perform consistent cyclical changes in the profile, which reflects cold/warm climate cycles since middle Pleistocene in Jiujiang of Jiangxi Province. The result shows that biomarkers in laterite strata have wonderful paleoclimate and paleo-environment significance. |
| PENG Hong-xia,ZHAN Cheng,MA Rui-yuan,GU Yan-sheng,HU Sheng-hong.2019.Characteristics of Biomarkers in Pleistocene Red Earth of Jiujiang, Jiangxi Province and Its Paleoclimatic and Environmental Significance[J].Acta Geoscientica Sinica,40(3):447-455. |
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