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SEDIMENTATION RATE AND SEDIMENTARY BREAK IN TIDAL DEPOSITS
Author(s): LI Congxian, WANG Ping, FAN Daidu, LI Tiesong
Pages: 11-
18
Year: 1999
Issue:
2
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY
Keyword: 潮汐沉积; 沉积间断; 浙北奥陶系; 长江三角洲;
Abstract: 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.
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