1稳定同位素地层学研究进展稳定同位素地层学是利用碳、氧、硫、锶等的稳定同位素组成在地层中的变化特征来研究地层的划分和对比,以及研究相应时代的古生态、古地理、古构造等领域。这些变化特征通常指某一沉积体系不同沉积序列中稳定同位素组成的特征,一般指全球一致性数值或全球同步变化趋势、区域性、沉积相或环境特殊指标等。例如由于和全球气候变化事件间的关系,地层中的氧同位素组成的变化特征已经成为中新生代地层划分和对比的重要指标和依据。鉴于沉积物中的氧同位素组成较易受到后期地质作用的影响,一般不用于古生代地层的划分和对比,而是用碳或锶同位素组成等在地层中的变化特征或规律进行 Stable isotope stratigraphy research Stable isotope stratigraphy is the use of stable isotope composition of carbon, oxygen, sulfur, strontium and other formations in the stratigraphic changes in the characterization of stratigraphic division and comparison, as well as the corresponding era of paleoecology, palaeogeography, Paleo-tectonics and other fields. These changes usually refer to the characteristics of stable isotopic composition in different depositional sequences of a sedimentary system, generally referring to the global consistent values ​​or global synchronous trends, regional, sedimentary facies or special environmental indicators. For example, due to its relationship with the global climate change events, the characteristics of oxygen isotope composition in the strata have become the important indicators and basis for the division and contrast of Meso-Cenozoic strata. In view of the fact that the composition of oxygen isotopes in sediments is more likely to be affected by later geologic processes, they are generally not used for the division and contrast of Paleozoic strata, but rather the characteristics or regularities of variation in strata such as carbon or strontium isotope composition