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本文运用T.A.Cross陆相高分辨率层序地层学理论对塔东地区侏罗系进行了研究分析,建立本区该时限内的等时地层格架。分析结果表明,本区侏罗系经历了6次中期基准面旋回的变化。层序Ⅰ—Ⅳ发育在相似的沉积背景下,即滨湖和湖岸泛滥平原环境中,沉积基准面位置较低。由层序Ⅰ到层序Ⅳ,基准面逐渐上升,沉积范围不断扩大,沉积层序不断向周边上超。层序Ⅴ—Ⅵ基准面继续上升,沉积格局发生明显变化,沉积范围继续向西扩大,沉积中心由东往西迁移。
In this paper, we use the theory of T.A.Cross terrestrial high-resolution sequence stratigraphy to study and analyze the Jurassic in Tarong area and establish the isochronal stratigraphic framework in this area. The analysis results show that the Jurassic in this area experienced six changes in mid-term base-level cycles. Sequence Ⅰ-Ⅳ developed in a similar sedimentary background, that is, the lakeshore and lakeshore floodplain environment, the sedimentary datum is low. From sequence Ⅰ to sequence Ⅳ, the datum surface gradually increases, and the sedimentary range expands continuously, and the sedimentary sequence continuously goes beyond the periphery. The sequence Ⅴ-Ⅵ continued to rise and the sedimentary pattern changed obviously. The sedimentary range continued to expand westward and the sedimentary center migrated from east to west.