论文部分内容阅读
在浙北奥陶系文昌组和长江三角洲开敞型淤泥质海岸非潮道潮汐纹层研究的基础上，得出与国外同类研究相近的沉积率。现代海岸进积速度和潮坪沉积的观察及测试证明，上述沉积率是难以置信的。现代潮坪观测表明，潮汐纹层在形成过程中即包含着改造，所保留的纹层占应形成数的不到１０％，其余９０％以上被侵蚀。小型层序是风暴和平静天气的产物，为风暴层序，与大小潮周期无关。其地层中保留的数量不到应生成数的１０％，其余９０％被改造。小型层序被侵蚀，其中的纹层随之消失。致使潮坪层序中保存的纹层数仅为应形成数的０．２％。被改造的纹层和单层留下的仅是侵蚀面，即小间断。在进行潮汐沉积高分辨率的研究时应充分重视沉积间断的作用
Based on the study of the Ordovician Wenchang Formation in the north of Zhejiang Province and the tidal flat of open tidal flat in the Yangtze River Delta, similar sedimentation rates to similar studies abroad were obtained. Observations and tests of the rate of sediment accumulation and tidal flat sedimentation in modern coastal areas prove that the above sedimentation rates are unbelievable. Modern tidal flat observations show that the tidal layer in the process of formation that includes the transformation of the retained layer accounted for less than 10% should be formed, the remaining 90% were eroded. Small-scale sequences are the product of storms and calm weather, which are storm sequences and are not related to large and small cycles. The number of reservoirs retained less than 10% of the number should be generated, and the remaining 90% were transformed. Small sequences are eroded, and the layers disappear. As a result, the number of layers preserved in the tidal flat is only 0.2% of the number that should be formed. The remnants of the lamina and monolayer leave only the erosion surface, ie small breaks. In the study of high resolution tide deposition should pay full attention to the role of sedimentary discontinuities