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红土中种类丰富的分子化石为红土古生态研究提供了直接证据,但较低含量的分子化石限制了传统索氏抽提方法的推广应用.本次研究尝试性地运用碱式水解法提取安徽宣城更新世红土中的分子化石,在25g样品中检测到了含量明显、种类丰富的有机物,且该方法可以显著地降低空白污染,这说明碱式水解法在分子化石含量低的地质体(如红土)研究中具有一定的应用潜力.本次研究检测出除了传统索式抽提得到的正构烷烃、脂肪酸、脂肪醇等以外,还提取到了二元羧酸这一重要化合物,它的存在为网纹红土可能形成于多水环境提供了新的证据.测试样品中各类分子化石组合信息显示出红土有机物以微生物为主的来源特征,表明网纹红土形成过程受到了微生物活动的影响,同时伴有大量低等菌、藻来源有机质的输入,初步结果为红土形成环境研究提供了新的证据.
The rich variety of fossils in the laterite provide direct evidence for the paleoecology research of lateritic soils, but the lower content of molecular fossils limits the popularization and application of traditional Soxhlet extraction.This study tentatively applied the basic hydrolysis method to extract Anhui The molecular fossils in the urban Pleistocene laterite were detected in 25g samples with abundant and abundant organic matter, and this method can significantly reduce the blank pollution. This shows that the alkaline hydrolysis method can be used in geologic bodies with low molecular fossil content ) Research has some potential applications.This study detected in addition to the traditional Soxhlet extracted n-alkanes, fatty acids, fatty alcohols, also extracted the dicarboxylic acid this important compound, its existence for the net The new evidence that the lateritic red clay may form in a multi-water environment provides a new evidence that the information of all kinds of fossil assemblages in the test samples shows that the lateritic organic matter is mainly of microbial origin, indicating that the process of reticulate red clay is affected by the activity of microorganisms, There are a large number of low bacteria, algae-derived organic matter input, preliminary results for the laterite formation environment provides new evidence.