| 南沙海区更新世以来的放射虫丰度低值事件及其古海洋学意义 |
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| 引用本文： | 王汝建.南沙海区更新世以来的放射虫丰度低值事件及其古海洋学意义[J].海洋地质与第四纪地质,2000,20(4):75-80. |
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| 作者姓名： | 王汝建 |
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| 作者单位： | 同济大学,教育部海洋地质重点实验室,上海,200092 |
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| 基金项目： | 中国科学院资助项目，高等院校骨干教师基金，49999560;49946011，，， |
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| 摘 要： | 根据南沙海区17957－2柱1．34Ma以来的放射虫定量研究发现，在0．88－0．91Ma和1．14－1．16Ma两个时期放射虫堆积率和丰度突然降到最低值，造成两次丰度低值事件。第一次丰度低值事件与0．9Ma发生的“中更新世革命”事件有关。这两次丰度低值事件可能是由于高的放射虫碎壳率所反映的强硅质溶解作用、含量较高的碳酸盐和火山灰的稀释作用以及较低的表层初级生产力三者的共同作用所造成的，反映了硅质生物沉积过程的复杂性。
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| 关 键 词： | 放射虫 低值事件 稀释作用 更新世 南沙海区 溶解作用 堆积速率 古海洋学 |
| 修稿时间： | 2000-09-16 |
LOW RADIOLARIAN ABUNDANCE EVENTS AND THEIR PALEO-OCEANOGRAPHIC IMPLICATIONS DURING THE PLEISTOCENE IN THE SOUTH CHINA SEA |
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| WANG Ru-jian.LOW RADIOLARIAN ABUNDANCE EVENTS AND THEIR PALEO-OCEANOGRAPHIC IMPLICATIONS DURING THE PLEISTOCENE IN THE SOUTH CHINA SEA[J].Marine Geology & Quaternary Geology,2000,20(4):75-80. |
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| Authors: | WANG Ru-jian |
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| Abstract: | Based on the quantitative study of radiolarians from the Pleistocene in core 17957 2 at the South China Sea,it is found that both radiolarian accumulation rate and abundance decreased to the lowest levels in periods from 0.88 to 0.91 Ma and from 1.14 to 1.16 Ma,resulting in two low abundance events.The first low abundance event is related to the mid Pleistocene climate transition that occurred at about 0.9 Ma.The two low abundance events could be induced by the combination of the strong siliceous dissolution indicated by high radiolarian fragmentation rate,the dilution of high carbonate and volcanic ash contents and the lower surface productivity,which shows the complicated process of deposition in siliceous organisms. |
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| Keywords: | radiolarians low abundance events dissolution and dilution Pleistocene the South China Sea |
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