西菲律宾海190ka以来钙质超微化石的氧碳同位素记录

赵京涛; 李铁刚; 常凤鸣; 李军

西菲律宾海190ka以来钙质超微化石的氧碳同位素记录

赵京涛^{1, 2, 3, 4,},
李铁刚¹,
常凤鸣¹,
李军^{3, 4}

1.
中国科学院海洋研究所海洋地质与环境重点实验室, 山东青岛 266071
2.
中国科学院研究生院, 北京 100039
3.
青岛海洋地质研究所, 山东青岛 266071
4.
国土资源部青岛海洋地质研究所, 山东青岛 266071

基金项目:

中国科学院知识创新工程项目 KZCX3-SW-233

国家自然科学基金重点项目 90411014

国家自然科学基金面上项目 40506013

国家自然科学基金面上项目 40506015

国家重点基础研究发展计划“973”项目 2007CB815903

中国科学院海洋研究所知识创新工程青年人才领域前沿项目 2007-10

详细信息

作者简介:
赵京涛(1980-), 男, 博士, 海洋地质专业.E-mail: zhaojingtao113@163.com

中图分类号: P736.22;P597
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出版历程
- 收稿日期: 2007-07-08
- 刊出日期: 2008-03-25

Oxygen and Carbon Isotope Records of Calcareous Nannofossils from the West Philippine Sea during the Last 190 ka

ZHAO Jing-tao^{1, 2, 3, 4
,},
LI Tie-gang¹,
CHANG Feng-ming¹,
LI Jun^{3, 4}

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Graduate School, Chinese Academy of Sciences, Beijing 100039, China
3.
Qingdao Institute of Marine Geology, Qingdao 266071, China
4.
Qingdao Institute of Marine Geology, Ministry of Land and Resources, Qingdao 266071, China

摘要

摘要: 对西菲律宾海Ph05-5柱状样190ka以来钙质超微化石进行了氧碳同位素分析.研究结果表明, 钙质超微化石δ¹⁸O值在末次间冰期(MIS 5e) 和全新世明显低于末次冰期(MIS5d~2) 和倒数第二次冰期(MIS6).超微化石δ¹⁸O值与浮游和底栖有孔虫δ¹⁸O值都呈明显的正相关关系, 但超微化石δ¹⁸O平均值比浮游有孔虫Globigerinoides rubber δ¹⁸O平均值高0.431×10^-3, 比Neogloboquadrina dutertrei δ¹⁸O平均值低0.410×10^-3, 而这三者又远远低于底栖有孔虫Cibicides wullerstorfi的δ¹⁸O平均值.超微化石δ¹³C值变化阶段性特征明显, 并与该孔超微化石绝对丰度变化趋势极为相似, 二者共同反映出西菲律宾海大约从190ka到110ka的MIS6和大约MIS 5e期, 表层海水初级生产力相当稳定且显著低于其他各时期; 大约从MIS5d期开始表层初级生产力显著上升, 初级生产力的这一高值一致持续到约25ka左右的末次冰期; 在25ka以来的MIS1、2期, 表层初级生产力有所下降, 但仍高于190ka到110ka的MIS6和MIS 5e期.
- 西菲律宾海 /
- 钙质超微化石 /
- 氧碳同位素 /
- 初级生产力
Abstract: The piston core Ph05-5 recovered from the West Philippine Sea (16.049 3°N, 124.344 8°E, water depth 3 382 m) was used to study the δ¹⁸O and δ¹³C variations of calcareous nannofossils.The δ¹⁸O values of calcareous nannofossils were obviously lower in Holocene and the last interglaciation than those in the last and the penultimate glaciation.During the last 190 ka the nannofossil δ¹⁸O values were positively correlated with those of planktonic and benthic foraminifera from the same core.But the average δ¹⁸O value of nannofossils was 0.431×10^-3, higher than that of planktonic foraminifera Globigerinoides rubber, and was 0.410×10^-3, lower than that of planktonic foraminifera Neogloboquad rina dutertrei.All the above three average δ¹⁸O values were much lower than those of benthic foraminifera Cibicides wullerstorfi.The change of nannofossil δ¹³C values showed similar trends with the absolute abundance of calcareous nannofossils in core Ph05-5, which also indicates the primary productivity variations in the West Philippine Sea.The primary productivity stayed at a stable but relatively low level at MIS 6 and MIS 5e.There was an abrupt rise at the beginning of MIS 5d for the primary productivity which retained high value until 25 ka BP.The primary productivity showed a slight decline during MIS 2 and MIS 1, but still higher than that of MIS 6 and MIS 5e.
- West Philippine Sea /
- calcareous nannofossils /
- oxygen and carbon stable isotopes /
- primary productivity

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图 1 Ph05-5岩心站位图, 箭头表示研究区内主要流系

Fig. 1. Location of core Ph05-5 used in this study. Arrows show the main ocean currents connected to this study

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图 2 Ph05-5岩心的δ¹⁸O曲线与标准化的δ¹⁸O曲线对比

4个年代数据均为AMS14C年代, 图中数字为对应的氧同位素期, 虚线代表粉红色红拟抱球虫的绝灭界线, 灰色条带代表火山灰层

Fig. 2. Comparison between oxygen isotope curves core Ph05-5 and standardized curve

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图 3 Ph05-5柱状样190 ka以来钙质超微化石与浮游有孔虫和底栖有孔虫氧同位素曲线对比

Fig. 3. δ¹⁸O records of calcareous nannofossils compared with those of palnktonic foraminiferal (G. ruber and N. dutertrei) and benthic foraminiferal (C. wullerstorfi) during the last 190 ka from core Ph05-5

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图 4 Ph05-5柱状样190 ka以来钙质超微化石碳同位素变化曲线与绝对丰度变化曲线的对比

Fig. 4. Comparison between nannofossil carbon isotope records and absolute abundance records during the last 190 ka from core Ph05-5

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表 1 Ph05-5柱状样AMS¹⁴C测年结果

Table 1. AMS¹⁴C ages of core Ph05-5

表 2 Ph05-5柱状样的氧同位素地层

Table 2. Oxygen isotope stratigraphy of core Ph05-5

表 3 Ph05-5柱状样钙质超微化石与浮游有孔虫和底栖有孔虫氧同位素值之间的相关系数

Table 3. Correlation coefficients between nannofossil δ¹⁸O values and that of foraminifers

表 4 Ph05-5柱状样钙质超微化石与浮游有孔虫和底栖有孔虫氧同位素值

Table 4. δ¹⁸O values of nannofossils and foraminifers from core Ph05-5

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