CAJ | 학술논문

【目的】了解粘土在广西主要河流出海口近岸的分布、变化、联系和富集特征。【方法】对钦州湾-廉州湾近岸浅海区沉积物进行取样测试，分析了4个钻孔43个岩芯样品和表层样品52个，阐明了该河口湾区全新世以来粘土分布、粒级分配、相互联系以及沉积环境、物源与富集。【结果】该区粘土广泛分布，钻孔粘土为0％～48.64％，表层为0％～62．10％，来源以河流和海岸侵蚀为主；垂向上粘土随环境变化而波动，总体上为下降趋势或者波动维持，但自晚全新世1m以来均为转折增加，多是 F粒级的升高；粘土最细 F粒级为主导因素，粒级分配显示该区粘土有一定的内在稳定性，与陆架浅海反相，高 F粒级及其比例具有河相和河口湾指示意义。表层粘土是对全新世以来的继承和发展，F粒级比例在0．65以上，最高达0．84，显示河流影响的稳定性和加强迹象；粘土对动力沉积环境变化响应灵敏，环境选择性强。【结论】结合了粘土本底值的表层沉积物粘土富集系数C/C′显示，粘土主要在钦州湾口水下斜坡、钦州湾口与三娘湾的结合部近岸以及湾口西南部富集，与潮流控制的低能动力沉积环境分区相对应。
【목적】료해점토재엄서주요하류출해구근안적분포、변화、련계화부집특정。【방법】대흠주만-렴주만근안천해구침적물진행취양측시，분석료4개찬공43개암심양품화표층양품52개，천명료해하구만구전신세이래점토분포、립급분배、상호련계이급침적배경、물원여부집。【결과】해구점토엄범분포，찬공점토위0％～48.64％，표층위0％～62．10％，래원이하류화해안침식위주；수향상점토수배경변화이파동，총체상위하강추세혹자파동유지，단자만전신세1m이래균위전절증가，다시 F립급적승고；점토최세 F립급위주도인소，립급분배현시해구점토유일정적내재은정성，여륙가천해반상，고 F립급급기비례구유하상화하구만지시의의。표층점토시대전신세이래적계승화발전，F립급비례재0．65이상，최고체0．84，현시하류영향적은정성화가강적상；점토대동력침적배경변화향응령민，배경선택성강。【결론】결합료점토본저치적표층침적물점토부집계수C/C′현시，점토주요재흠주만구수하사파、흠주만구여삼낭만적결합부근안이급만구서남부부집，여조류공제적저능동력침적배경분구상대응。
[Objective]The distribution,variation,relationship and accumulation of clay were ana-lyzed in main estuary in Guangxi coast in order to understand their characteristics.[Methods]Four boreholes and 52 surficial sediments were sampled from outer Qinzhou Bay to western Beihai waters.Based on the sediment sampling and laboratory sample test data,the clay distri-bution,composition and variation were estimated since Holocene.[Results]The clay widely ap-pears in studied area ranging from 0%~48.64% in boreholes and 0%~62.10% in surficial sediments with inputting from river runoff and coast erosion.Vertical clay's concentration va-ries in waving way in boreholes,which generally showed a decreasing trend but transited since late Holocene 1 m and increased.F grain takes main part of clay and indicates river-facies and estuary - facies opposite to shallow shelf. Developed from late Holocene,the finest F grain of surficial sediments takes account the ratio of 0.65 in average and reaches the maximum of 0.84,revealing river's control maintains and en-hances.The clay demonstrates a sensitive re-sponse to dynamic sedimentary environment by means of average grain size and grain parameters.[Conclusion]Combining clay's background value and enriching index C/C',main clay accumulating areas include the mouth of Qingzhou Bay,the intersection of Qingzhou Bay and Sanniang Bay,and southwestern part of studied area, corresponding to deeper and tide controlled low energy areas.