Terrigenous Input to the Northern Slope of the South China Sea and Its Controlling Factor since the Last Phase of the Last Glacial Maximum
详细信息
- 责任者：Huang Jie (Key Laboratory of Marine Geology and Environment ; Institute of Oceanology ; Chinese Academy of Sciences ; Qingdao 266071 ; China) ; Li Anchun
- 刊名：Oceanologia et Limnologia Sinica
- 出版年：2013
- 卷期：44(4)
- 关键词：陆源物质 ; terrigenous materials ; 海洋沉积物 ; marine sediments ; 南海 ; South China Sea
- 页码：p.882-889
- 图表：illus., 2 tables, 27 refs.
- 分类号：0200
- issnNo：ISSN0029-814X
- isbnNo：CN37-1149/P
摘要
AMS14C,dating grain size and clay minerals of Core KNG5 sediments taken from the northern slope of the South China Sea were analyzed to discuss the evolution of provenances and controlling factors since 18ka.Sediment source studies indicate that the sediment source of Core KNG5 was mainly from the Zhujiang(Pearl)River during17.5—12.5ka BP,while the clay assemblages sudden change at 12.5ka BP indicated that the sea level had risen to a considerable height,the modern circulation system of South China Sea had begun to form,and the Guangdong Coast Current should have been the main contributor to the kaolinite spatial distribution prograding southward once entering the shelf.The main contributor was later changed ti Taiwan Island during 17.5—12.5ka BP owing to the influence of the North Pacific Deep Water(NPDW)and South China Sea Branch of Kuroshio.Grain size and clay minerals of Core KNG5 during17.5—11ka BP were controlled by sea level change.The strong East Asian Summer Monsoon might be responsible for the minimum of mean grain size and the maximum contents of fluvial mud(1—2.2μm)in the Early Holocene.The decrease of fluvial mud(1—2.2μm)in the Middle and Late Holocene(8ka BP—0ka BP)well reflected the weak of East Asian Summer Monsoon since 8ka BP;and the content of fluvial mud(1—2.2μm)showed the evolution of East Asian Summer Monsoon,which corresponded well with other indexes of the Northern Hemisphere monsoon,showing that the weakened monsoon was the common phenomenon in each monsoon system of the Northern Hemisphere and also the monsoon evolution since Holocene in the global scale.