化学化石
- 网络chemical fossil
化学化石-
化学化石（烷烃和卟啉）是前寒武纪地层中生命存在的唯一证据。
Chemical fossils ( e.g. alkanes and porphyrins ) are often the only evidence for life in rocks of PRECAMBRIAN age .
-
某沉积层段的厚度、岩石类型、结构组分、矿物成分、化学成分、化石及其生态组合等，均可作为单因素。
The thickness of the interval and its specific rock types , texture constituents , mineral composition , chemical composition , fossils and their ecological assemblages , etc. , can all be taken as single factors .
-
目前二氧化碳的分离研究主要集中在膜分离、溶剂化学吸收、及化石燃料的新型利用方式。
At present , the researches on CO2 separation are mainly focused on membrane separation , solvents adsorb and new methods of utilizing fossil fuel .