摘要
粒度是沉积物的重要结构特征,分析沉积物的粒度分布能够重建其沉积水动力方式和水动力条件,有效判断沉积物的沉积环境。对江苏北部东台县弶港镇条子泥潮滩的沉积构造进行了现场观察,识别了梳状波痕、平行波痕、不连续波痕、干涉波痕、平顶波痕和流水波痕等6种不同类型的波痕。选取不同波痕和波痕不同部位的10个沉积物样品进行粒度分析,结果显示,区内的潮滩沉积物主要为极细砂和粉砂,10个样品的粒度频率曲线皆呈不对称单峰型,粒度概率累积曲线多表现为两段式,表明沉积物总体分选较好。不同样品粒度参数的差异性分析结果表明,沉积物的分选性不仅与潮滩环境的水动力条件有关,也受局部水动力强度、水动力作用时间影响。该研究丰富了对条子泥潮滩沉积的地质认识,也为类似的地下潮汐成因砂体研究提供了可供对比的实例。
Grain size distribution is an important textural feature of sediments.Grain size analysis of sidements can be used to establish the method and the conditions for hydrodynamic reconstruction for an effective sedimentary environment identification.Through a field sediment observation on the Tiaozini tidal flat in Jianggang Town of Dongtai County in northern Jiangsu Province,six types of ripples are identified,including comb-shaped ripple,parallel ripple,discontinuous ripple,interference ripple,flaten ripple and current ripple.The grain size distribution of 10 sediment samples with different ripple marks and in different positions of ripple marks shows that the tidal flat sediments in this area are mainly very fine sand and silt sand.The grain size frequency curves of the 10 samples are asymmetrical with single peak,and the probability cumulative curves are mostly two-segmented,which indicates that the sediments are well sorted in general.Analysis for the difference of grain size parameters among different samples shows that the sorting of sediments is not only related to the hydrodynamic conditions of tidal flat environment,but also affected by local hydrodynamic strength and the time of sedimentary processes.This study enriches the recognition of tidal flat researches in Tiaozini Area and provides an analogy for studying the genesis of underground tidal deposits.
作者
侯国伟
张志垚
陈哲
张昌民
尹太举
冯文杰
张金亮
徐发
Hou Guowei;Zhang Zhiyao;Chen Zhe;Zhang Changmin;Yin Taiju;Feng Wenjie;Zhang Jinliang;Xu Fa(Shanghai Branch of CNOOC (China) Ltd.,Shanghai 200335;School of Geosciences,Yangtze University,Wuhan 430100,Hubei;School of Natural Resources,Beijing Normal University,Beijing 100875)
出处
《长江大学学报（自然科学版）》
CAS
2019年第7期9-14,M0002,共7页
Journal of Yangtze University(Natural Science Edition)
基金
国家科技重大专项(2016ZX05027-002-007)
关键词
条子泥潮滩
波痕
潮汐沉积
粒度
江苏北部
Tiaozini tidal flat
ripples
tidal deposits
grain size
the north of Jiangsu Province
