Paleoenvironmental Changes in the Northern Okinawa Trough since 25 ka BP： REE and Organic Carbon Evidence

Paleoenvironmental changes in the northern Okinawa trough covering the last 25 ka were synthetically reconstructed using REE and organic carbon indices of core CSH1.Variations of these parameters revealed three distinct intervals of major sediment provenance changes that can be related to sea-level...

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Bibliographic Details
Published in:Journal of earth science (Wuhan, China) China), 2012-06, Vol.23 (3), p.297-310
Main Author: 徐兆凯 李铁刚 南青云 于心科 李安春 Jinyong Choi
Format: Article
Language:English
Subjects:
Back propagation
Biogeosciences
Carbon
Climate change
Earth and Environmental Science
Earth science
Earth Sciences
Evolution
Fluctuation
Geochemistry
Geology
Geotechnical Engineering & Applied Earth Sciences
Intervals
Oceanography
Organic carbon
Paleoclimate science
Productivity
Rivers
Sea level
Sediments
冲绳海槽北部
初级生产力
古环境变化
对马暖流
有机碳
海平面上升
稀土元素
证据
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Summary:Paleoenvironmental changes in the northern Okinawa trough covering the last 25 ka were synthetically reconstructed using REE and organic carbon indices of core CSH1.Variations of these parameters revealed three distinct intervals of major sediment provenance changes that can be related to sea-level fluctuation and Tsushima Warm Current evolution.Interval 1（16-24.7 ka BP） is characterized by dominantly fluvial discharge from the Changjiang（Yangtze River） and Huanghe（Yellow River） as well as high primary productivity.In Interval 2（7.3-16 ka BP）,the Changjiang and Huanghe mouths regressed with sea-level rising.The newly formed Tsushima Warm Current could carry some sediment loads of Taiwan to the study core,especially during its late phase（7.3-8.2 ka BP）.Modern oceanographic conditions were finally established since the beginning of Interval 3,leading to more terrigenous contribution from Taiwan,whereas low sea-surface productivity in the study area.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-012-0254-5