西太平洋暖池区第四纪钙质超微化石氧碳同位素特征及意义

刘传联; 成鑫荣; 王汝建; 翦知湣; 吴晓光

西太平洋暖池区第四纪钙质超微化石氧碳同位素特征及意义

同济大学海洋地质国家重点实验室，上海 200092

基金项目:

国家自然科学基金项目 40376019

国家自然科学基金项目 40331002

国家自然科学基金项目 40125015

国家重点基础研究专项项目 G2000078502

创新研究群体科学基金项目 40321603

详细信息

作者简介:
刘传联(1963-)，男，教授，主要从事钙质超微化石与古海洋学研究.E-mail：liucl@mail.tongji.edu.cn

中图分类号: P53;P73
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出版历程
- 收稿日期: 2005-05-17
- 刊出日期: 2005-09-25

Oxygen and Carbon Isotope Records of Quaternary Calcareous Nannofossils from the Western Pacific Warm Pool and Their Palaeoceanographical Significance

State Key Laboratory of Marine Geology, Tongj i University, Shanghai 200092, China

摘要

摘要: 对西太平洋暖池区MD97-2140柱状样1.75Ma以来的钙质超微化石进行了氧碳同位素分析.结果表明超微化石δ¹⁸O值与浮游有孔虫Globigerinoides ruber δ¹⁸O值在变化趋势和周期上都具有明显相似性.根据超微化石δ¹⁸O值也可以划分出59个氧同位素期, 1748ka到900ka期间超微化石δ¹⁸O值的变化周期以41ka为主, 而850ka到6ka期间则以100ka为主.这说明超微化石氧同位素分析可以像有孔虫氧同位素分析一样在大洋地层学和古海洋学、古气候学研究中发挥重要作用.超微化石δ¹³C值变化则呈现阶段性变化的特点, 以900ka, 480ka和250ka时间面为界, 可分四大阶段.同时, MD97-2140柱状样超微化石δ¹³C值的这种变化规律与邻近ODP807站揭示的海水初级生产力变化趋势极为相似, 意味着超微化石δ¹³C值是反映海水初级生产力变化的一项重要指标.
- 氧碳同位素 /
- 钙质超微化石 /
- 第四纪 /
- 西太平洋暖池
Abstract: Oxygen and carbon isotopic analyses have been carried out on calcareous nannofossils from core MD97-2140 in the Western Pacific warm pool. The results demonstrate that the δ¹⁸O values of calcareous nannofossils for the past 1.75 Ma vary systematically with δ¹⁸O values of planktonic foraminifer Globigerinoides ruber from the same core. The δ¹⁸O records of calcareous nannofossils show a dominant 41 ka peak between 1 478 and 900 ka and a 100 ka peak between 850 and 6 ka, and 59 isotope stages can be recognized. The similarity between δ¹⁸O records of planktonic foraminifera and nannofossils implies that calcareous nannofossil δ¹⁸O can also play an important role in stratigraphic and palaeoceanographic studies. The δ¹³C records of nannofossils can be divided into four major stages respectively at the boundaries 900 ka, 480 ka and 250 ka. The trends of the nannofossil δ¹³C records from MD97-2140 are similar to primary productivity variations at ODP site 807, also located in the Western Pacific warm pool, indicating that nannofossil δ¹³C can be used as an indicator of sea surface palaeoproductivity.
- oxygen and carbon isotope /
- calcareous nannofossils /
- Quaternary /
- Western Pacific warm pool

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图 1 MD97-2140柱状样和ODP 807站位置

28℃等温线内代表西太平洋暖池区的范围, 29℃等温线内则是暖池核心区

Fig. 1. Location map of MD97-2140 and ODP site 807

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图 2 MD97-2140柱状样1.75 Ma以来钙质超微化石与浮游有孔虫氧同位素曲线对比及氧同位素期划分

浮游有孔虫氧同位素值及样品年龄据De Garidel-Thoron et al. (2005)

Fig. 2. Downhole variations in theδ¹⁸O of calcareous nannofossils (this study) and planktonic foraminifera (De Garidel-Thoron et al. (2005)) over the past 1.75 Ma in MD97-2140

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图 3 MD97-2140柱状样钙质超微化石氧同位素频谱分析

a.6~850 ka; b.900~1 748 ka; 点划线表示90%可信度

Fig. 3. Spectral analysis of δ¹⁸O of calcareous nannofossils from MD97-2140

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图 4 MD97-2140柱状样1.75 Ma以来钙质超微化石碳同位素变化曲线与ODP 807站海水初级生产力变化曲线的对比

Fig. 4. Comparison between δ¹³C variations of calcareous nannofossils in MD97-2140 and primary productivity variations in ODP site 807 over the past 1.75 Ma

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