南海ODP1143站底栖有孔虫Cibicidoides与Uvigerina稳定氧碳同位素值的均衡试验

田军; 汪品先; 成鑫荣

南海ODP1143站底栖有孔虫Cibicidoides与Uvigerina稳定氧碳同位素值的均衡试验

同济大学海洋地质教育部重点实验室, 上海 200092

基金项目:

国家自然科学基金重大项目 49999560

国家重点基础研究发展规划“973”项目 G2000078500

国家自然科学基金青年基金项目 40306011

详细信息

作者简介:
田军（1974-），男，讲师，目前在同济大学从事海洋地质学的科研与教学工作.E-mail：tianjun＠mail.tongji.edu.cn

中图分类号: P736
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出版历程
- 收稿日期: 2003-07-11
- 刊出日期: 2004-01-25

Stable Isotope Equilibrium Test between Benthic Foraminifer Cibicidoides and Uvigerina at ODP Site 1143, Southern South China Sea

Laboratory of Marine Geology, Tongji U niversity, Shanghai 200092, China

摘要

摘要: 从南海南部ODP¹⁸⁴航次1143站上部合成深度190.77m共1992个样品中, 由老到新挑选了64个样品, 测试了同一样品中底栖有孔虫Uvigerina peregerina与Cibicidoides wuellerstorfi的δ¹⁸O和δ¹³C值, 结果表明1143站U.peregerina与C.wuellerstorfi的δ¹⁸O差值的平均值约为(0.614±0.07)×10^-3, 而δ¹³C差值的平均值约为(0.692±0.04)×10^-3.1143站U.peregerina与C.wuellerstorfi的δ¹⁸O差值与大西洋和东太平洋的标准差值0.64×10^-3比较接近, 而δ¹³C的差值却比大西洋和东太平洋的标准差值0.9×10^-3轻0.2 08×10^-3, 可能是由于南沙珊瑚礁区较低的生产力缩小了沉积物与海水之间的δ¹³C的差异而引起的.该均衡试验为南海甚至西太平洋的古海洋学研究提供了上述2种底栖有孔虫氧碳同位素值转换的标准.
- 南海 /
- ODP1143站 /
- 底栖有孔虫 /
- 同位素
Abstract: Stable oxygen and carbon isotope records from ODP Site 1143 (9°21.72′N, 113°17.11′E, 2 772 m) in the southern South China Sea (SCS) are presented for the benthic foraminifers Cibicidoides wuellerstorfi and Uvigerina peregerina in 64 samples. The results show that the average δ¹⁸O difference between Cibicidoides wuellerstorfi and Uvigerina peregerina of 64 samples at Site 1143 is (0.614±0.07)×10^-3, close to 0.64×10^-3 of the standard oxygen isotopic difference in the Atlantic and the east Pacific, whereas the average δ¹³C difference of these two species at Site 1143 is (0.692±0.04)×10^-3, much lighter than 0.9×10^-3 of the standard carbon isotopic difference in the Atlantic and the east Pacific. The lighter value of δ¹³C difference at Site 1143 may be caused by the low productivity in reef areas which had decreased the δ¹³C difference between the depositions and the sea water. This test at Site 1143 provides an adjustive standard of oxygen and carbon isotope values between benthic foraminiferal Cibicidoides wuel-lerstorfi and Uvigerina peregerina for the paleoceanographic study in the South China Sea and even in the west Pacific.
- South China Sea /
- ODP Site 1143 /
- benthic foraminifer /
- isotope

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图 1 南海ODP1143站站位示意图

Fig. 1. Location map of ODP Site 1143 in the South China Sea

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图 2 a.某一范围内底栖有孔虫Uvigerina peregerina和Cibicidoides wuellerstorfi的δ¹⁸O差值与其出现频率的直方图; b.Uvigerina peregerina和Cibicidoides wuellerstorf的δ¹³C差值与其出现频率的直方图; c.Δδ¹⁸O_(Uvig-Cibi)与底栖有孔虫δ¹⁸O的关系; d.Δδ¹⁸O_(Uvig-Cibi)与底栖有孔虫δ¹³C的关系; e.Δδ¹³C_(Cibi-Uvig)与底栖有孔虫δ¹⁸O的关系; f.Δδ¹³C_(Cibi-Uvig)与底栖有孔虫δ¹³C的关系; g.Δδ¹⁸O_(Uvig-Cibi)与Δδ¹³C_(Cibi-Uvig)的关系; h.本文中用作同位素分析的底栖有孔虫Cibicidoides wuellerstorfi与Uvigerina peregerina的扫描照片

Fig. 2. a.Histogram of δ¹⁸O offsets between Uvigerina peregerina and Cibicidoides wuellerstorfi (mean value is 0.614×10^-3, n=62); b.Histogram of δ¹³C offsets between Cibicidoides wuellerstorfi and Uvigerina peregerina (mean value is 0.692×10^-3, n=62); c.Δδ¹⁸O_(Uvig-Cibi) as a function of δ¹⁸O; d.Δδ¹⁸O_(Uvig-Cibi) as a function of δ¹³C; e.Δδ¹³C_(Cibi-Uvig) as a function of δ¹⁸O; f.Δδ¹³C_(Cibi-Uvig) as a weak linear function of δ¹³C; g.Δδ¹⁸O_(Uvig-Cibi) as a function of Δδ¹³C_(Cibi-Uvig); h.photos of Cibicidoides wuellerstorfi and Uvigerina peregerina

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图 3 南海南部ODP1143站5 Ma以来底栖有孔虫的氧碳同位素记录.a中的阿拉伯数字代表某些特定的氧同位素期次, 箭头代表晚上新世全球逐渐变冷或北半球冰盖最终形成的过程

Fig. 3. Oxygen and carbon isotope records at ODP Site 1143 in the southern South China Sea for the past 5 Ma. The numbers below the curve a denote some marine isotope stages. The arrow indicates the late Pliocene global gradual cooling or the final forming process of the northern hemisphere ice sheet

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参考文献(10)

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