CAJ | 학술논문

江汉平原内部巨厚的晚新生代沉积物记录了长江形成与演化的信息。本文以流经江汉平原的几条主要河流为研究对象，以 Sr-Nd同位素组成为指示剂，开展了其现代河流沉积物物源示踪研究。结果表明：流经江汉平原的几条主要河流中，长江水系沉积物具有最高的143 Nd/144 Nd 值，汉江次之，漳河与沮河最低。Sr同位素组成呈现相反的变化趋势。各河流沉积物同位素组成与其流域内的源岩分布特征有很好的对应关系。由此认为，现代长江形成前后，江汉平原沉积物 Sr-Nd 同位素组成应有明显差异。这为在江汉平原内部通过沉积物 Sr-Nd同位素组成变化探讨长江形成与演化提供了理论基础。
강한평원내부거후적만신생대침적물기록료장강형성여연화적신식。본문이류경강한평원적궤조주요하류위연구대상，이 Sr-Nd동위소조성위지시제，개전료기현대하류침적물물원시종연구。결과표명：류경강한평원적궤조주요하류중，장강수계침적물구유최고적143 Nd/144 Nd 치，한강차지，장하여저하최저。Sr동위소조성정현상반적변화추세。각하류침적물동위소조성여기류역내적원암분포특정유흔호적대응관계。유차인위，현대장강형성전후，강한평원침적물 Sr-Nd 동위소조성응유명현차이。저위재강한평원내부통과침적물 Sr-Nd동위소조성변화탐토장강형성여연화제공료이론기출。
The late Cenozoic sediments deposited in the Jianghan Plain recorded information on the evo-lution of the Yangtze River.Many researches have been carried out to find information on the prove-nance changing of these sediments and to reconstruct the evolution history of the Yangtze River.How-ever,sediments from the rivers around the Jianghan Plain were neglected.In this study,systematic Sr-Nd isotopic compositions of sediments from the rivers around the Jianghan Plain were carried out to ex-tract implications for the sediment source.The results showed that the sediments from the Yangtze River has the highest 143 Nd/144 Nd values.143 Nd/144 Nd values of sediments from the Hanjiang River are more negative (lower)than those of the Yangtze River,but higher than those of the Juhe River and the Zhanghe River.The Sr isotopic compositions of these sediments showed contrary variations.The Sr-Nd isotopic compositions of the sediments were well dominated by the source rocks distributed in the drain-age basin.Based on the results,it was assumed that sediments of the Jianghan Plain should have much lower (negative)143 Nd/144 Nd values before the modern Yangtze River was formed.However,the 143 Nd/144 Nd values should become higher (positive)after that.It showed that it was theoretically feasi-ble to reconstruct the evolution history of the Yangtze River through the Sr-Nd isotopic variations of sediments in the Jianghan Plain.