Paleoceanography of the Last Glacial Maximum in the Flores Sea of the Indonesian Archipelago
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摘要: 弗洛勒斯海位于印度尼西亚穿越流通道上, 它的古海洋学特征对于理解LGM以来穿越流活动历史, 及其与全球气候变化的关系具有重要意义.通过对弗洛勒斯海SHI9011岩心δ18O、δ13C、浮游有孔虫组合及碳酸盐含量等古海洋学记录的研究, 认为研究区沉积速率不高, 生物生产力却并不低于高沉积速率的近陆地区.冰期时海平面下降, 陆源物质输入量增加, 使得古生产力上升.冰消期终止期IA海平面快速上升, 陆源营养物质供应减少, 同时穿越流活动增强, 抑制了下部水体向上运动, 古生产力开始下降.8~6ka前后, 强烈的东南季风使得研究区上升流活动增强.Abstract: The Flores Sea is situated in the path of the Indonesian throughflow. Its paleoceanographical characteristic is very important for us to understand the throughflow actions during the last glacial maximum, and the relationship between the throughflow and global climate changes. Based on the study of the paleoceanographical record δ18O, δ13C, planktonic foraminifer assemblage and CaCO3 relation abundance of the core SHI9011 from the Flores Sea, the results are following: the sediment rate in the studied region was not high, but the productivity was not lower than the region nearby the land where sediment rate was high. The sea level dropped in the glacial, the mass of the terrigenous sediment increased, so that the paleoproductivity ascended. The sea level rose rapidly in the deglaciation termination, the terrigenous nutrition decreased, and the throughflow action enhanced, restraining the upwelling of the down water, the paleoproductivity descended. In around 8-6 ka, due to the strong southeast monsoon action, the upwelling action enhanced in the studied region.
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Key words:
- the Flores Sea /
- LGM /
- paleoceanography /
- throughfolw /
- southeast monsoon /
- upwelling
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图 1 印尼海区现代八月表层洋流活动示意图和SHI9011岩心位置(Gingele et al., 2002)
Fig. 1. Today August currents in the Indonesian Archipelago and the location of the core SHI9011
图 2 SHI9034、SHI9011岩心氧同位素曲线, SHI9011岩心二、八月SSS以及G. sacculifer/G. ruber比值变化曲线
Fig. 2. Curves of oxygen isotope of the cores SHI9034 and SHI9011, curves of the SSS of February and August and rate of G.sacculifer/G. ruber
图 3 SHI9011岩心氧同位素, 浮游、底栖有孔虫和CaCO3堆积速率, CaCO3含量和有孔虫碎壳率变化曲线
Fig. 3. Curves of oxygen isotope, MAR of planktonic and benthic foraminifers and CaCO3, relative abundance of CaCO3, fragments of foraminifera of the core SHI9011
图 4 SHI9011岩心浮游有孔虫重要属种百分含量变化曲线
Fig. 4. Species relative abundance of planktonic foraminifera of the core SHI9011
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