Sediment provenance discrimination in northern Okinawa Trough during the last 24 ka and paleoenvironmental implication:rare earth elements evidence
来源期刊：JOURNAL OF RARE EARTHS2012年第11期
论文作者：徐兆凯 李铁刚 常凤鸣 CHOI Jinyong LIM Dhongil 徐方建
文章页码：1184 - 1190
摘 要：Rare earth elements（REE） compositions and discriminant function were successfully used to examine high resolution sediment source changes in the northern Okinawa Trough over the last 24.1 ka,especially for the influence from the Yellow River and the Tsushima Warm Current（TWC） that has not been well solved.Variations of these parameters were clearly divided into three distinct depositional units.During Interval 1（24.1-16.0 ka BP）,the paleo-Yellow River and the paleo-Yangtze River mouths were situated near the studied area and could have played major roles in the sedimentation therein.In Interval 2（16.0-7.3 ka BP）,these river mouths gradually retreated with global sea-level rise,leading to less fluvial inputs from them to the northern Okinawa Trough.Meanwhile,formation of the TWC could carry some sediment loads of Taiwan to the studied core,especially during its late phase（8.0-7.3 ka BP）.Modern oceanographic conditions,with a predominance of the TWC,were finally established since the beginning of Interval 3,causing more terrigenous contribution from Taiwan to the studied area.Sub-sequently,modern depositional environments mainly influenced by the Yellow River,the Yangtze River,and the TWC were finally formed.
徐兆凯1，李铁刚1，常凤鸣1，CHOI Jinyong2，LIM Dhongil3，徐方建4
1. Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences2. Department of Oceanography,Kunsan National University3. South Sea Institute,Korea Ocean Research and Development Institute4. School of Geo-sciences,China University of Petroleum
摘 要：Rare earth elements（REE） compositions and discriminant function were successfully used to examine high resolution sediment source changes in the northern Okinawa Trough over the last 24.1 ka,especially for the influence from the Yellow River and the Tsushima Warm Current（TWC） that has not been well solved.Variations of these parameters were clearly divided into three distinct depositional units.During Interval 1（24.1-16.0 ka BP）,the paleo-Yellow River and the paleo-Yangtze River mouths were situated near the studied area and could have played major roles in the sedimentation therein.In Interval 2（16.0-7.3 ka BP）,these river mouths gradually retreated with global sea-level rise,leading to less fluvial inputs from them to the northern Okinawa Trough.Meanwhile,formation of the TWC could carry some sediment loads of Taiwan to the studied core,especially during its late phase（8.0-7.3 ka BP）.Modern oceanographic conditions,with a predominance of the TWC,were finally established since the beginning of Interval 3,causing more terrigenous contribution from Taiwan to the studied area.Sub-sequently,modern depositional environments mainly influenced by the Yellow River,the Yangtze River,and the TWC were finally formed.
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