海侵-海退的重新解释及其地质学意义研究

Re-exlanation of Transression and Reression and Geoloical Sinificance

海平面变化的主要表现形式是海侵和海退,它们是地球地质历史发展中最基本的现象和过程,也是层序地层学的主要构建机制。识别出2种海侵模式(正常海侵和快速海侵)和3种海退模式(高水位正常海退、低水位正常海退和强迫型海退),着重论述了2种海侵模式和3种海退模式在层序地层学中的定义及解释,并探讨了其地质学意义。快速海侵的普遍性及其典型的沉积特征对区域性地层对比和沉积环境突变解释有着很好的指导意义;正常海退和强迫型海退的辨别,改革了传统的层序地层模式,由三分变为四分,变得更加完善和科学;高水位正常海退和低水位正常海退的区分细化了地层沉积叠置样式的分类,强调了对沉积过程的讨论;海侵-海退过程的深入理解促使层序地层学朝成熟化、精细化方向发展。

Transgression and regression are main manifestations of the sea-level change.As the most fundamental phenomenon and process in the earth evolutionary history,they are the essential mechanism of sequence stratigraphy.Two transgression models(normal transgression and rapid transgression)and three regression models(highstand normal regression,lowstand normal regression and forced regression)are identified,and their definitions and explanations in sequence stratigraphy are emphasized and the geological significance is discussed.Rapid trasgression and its typical sediment feature provide guidance for regional strata comparison and the explanation of sedimentary environment mutation.The identification of normanl regression and forced regression reform the traditional stratigraphic model by grouping it into four categories instead of three.The distinguishing of highstand normal regression and lowstand normal regression refine the category of sediment superposition pattern and underline the dicussion of the deposition process.A further understanding about the transgression and regression process accelerates the maturity and refinement of the sequence stratigraphy.