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本文尝试将时频分析技术与层序地层学原理相结合,进行陆相层序地层的周期分解,并通过与古气候和古构造的单成因周期对比,探讨不同级序层序地层的动力成因机理。该方法在辽河断陷盆地的应用结果表明,构造和古气候旋回对不同级序陆相层序地层的影响程度不等。小尺度(<1.19 Ma)的古气候和古构造变化具有相关性,两者共同决定层序体发育。Ⅲ级(4.2～8.5 Ma)古构造与古气候变化相对独立,幕式构造活动具有幔源特征,控制主要沉降期和沉降带分布;古气候变化与全球性气候变化相应,决定古植被类型和水体规模,层序结构来自两者的时序配置。古气候变化对陆相层序地层发育仍然具有重要影响。
This paper attempts to combine time-frequency analysis with the principle of sequence stratigraphy to carry out the periodic decomposition of terrestrial sequence stratigraphy. By comparing with the single genesis period of paleoclimate and palaeostructure, the paper discusses the dynamic formation of sequence stratigraphy mechanism. The application of this method to the Liaohe rift basin shows that the degree of influence of tectonism and palaeoclimate cycles on the terrestrial sequence stratigraphy of different orders varies. The correlation between the paleoclimate and the paleostructural changes at the small scale (<1.19 Ma), which together determine the development of the sequence body. The palaeostructures of Stage Ⅲ (4.2 ~ 8.5 Ma) are relatively independent of paleoclimate changes. The curtain tectonic activities have mantle-source characteristics and control the main subsidence periods and the distribution of subsidence zones. Paleoclimate changes correspond to the global climate change, The size of the water body and the sequence structure come from the timing configuration of the two. Paleoclimate changes still have an important influence on the development of terrestrial sequence stratigraphy.