江苏中部淤泥质潮滩潮汐层理成因机理和风暴沉积判别标志  

Mechanism of Silt-mud Couplet of Mud Tidal Flat and Discrimination Criteria of Storm Surge Sedimentation in the Middle Jiangsu Province

作　　者：王建[1] 柏春广[1] 徐永辉[1] 

机构地区：[1]南京师范大学地理科学学院,南京210097

出　　处：《沉积学报》2006年第4期562-569,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:49601019);国家重点基础和发展规划项目(2003CB415201-8);国家教育振兴计划教育部青年教师奖励基金(批准号:2001JBC12)资助

摘　　要：通过对江苏中部淤泥质潮滩潮汐纹层发育过程的实地观测,以及对所采样品在室内进行的落淤量的计算与颗粒的粒度、磨圆度分析等,揭示出江苏中部海岸淤泥质潮滩沉积中的潮汐层理的成因机理:毫米级薄砂泥互层层理为半日潮的产物,厘米级厚的厚砂泥互层层理为半月天文潮的产物。此外,通过对9711号台风引致的风暴潮影响前后的滩面进行了现场观测,发现江苏中部淤泥质潮滩上部存在一个即使在风暴潮期间也不发生侵蚀的地带。该带的风暴沉积与正常的潮滩沉积比较,具有粒度较粗,分选较差,磨圆稍好,递变现象明显,平行层理或波状交错层理发育比较典型的特征。Field observation on the formation and development process of silt-mud couplets is carried out on tidal flat of the middle Jiangsu province. Combined the observation result with the calculation of sedimentation quantity and the analysis of grain-size and roundness of sedimentary particles, the mechanism of silt-mud couplets is revealed in this area. One thin silt-mud couplet with the thickness of millimeters is formed during a flood-ebb tidal cycle, and one thick couplet with the thickness of centimeters is formed during a spring-neap tidal cycle. In addition to the research on the formation of silt-mud couplets, the field observation on the tidal flat is carried out before and after the storm surge for typhoon No. 9711. The result shows that even during storm surge period, high tidal flat can still be in sedimentation over some places, no erosion occurred. Compared with the normal tidal flat sedimentation, the storm sedimentation has the characteristics of coarse particle, bad sorting, relatively high roundness, obviously graded bedding, typical parallel bedding, cross bedding.

关 键 词：潮汐纹层 成因机理 风暴潮 判别标志 江苏中部 

分 类 号：P512.2[天文地球—地质学]