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)

Duplessy, J. C., Shackleton, N. J., Matthews, R. K., et al., 1984. δ¹³C record of benthic foraminifera in the last inter-glacial ocean: Implications for the carbon cycle and the global deep water circulation. Quaternary Research, 21: 225-243. doi: 10.1016/0033-5894(84)90099-1
Imbrie, J., Hays, J. D., Martinson, D. G., et al., 1984. The or-bital theory of Pleistocene climate: Support from a revised chronology of the marine δ¹⁸O record. In: Berger, A., ed., Milankovitch and climate. D. Reidel, Norwell, Mass., 269-305.
Mix, A. C., Le, J., Shackleton, N. J., 1995. Benthic foraminiferal stable isotope stratigraphy of Site 846: 0-1.8 Ma. In: Pisias, N. G., Mayer, L. A., Janecek, T. R., et al., eds., Proc. ODPSci. Results, 138, 839-854.
Ruddiman, W. F., 2000. Earth sclimate: Past and future. W. H. Freeman and Company, New York, 174-192.
Shackleton, N. J., 1974. Attainment of isotopic equilibrium be-tween ocean water and the benthonic foraminifera genus Uvigerina: Isotopic changes in the ocean during the last gla-cial. Les Meth. Quant. d'etude Var. Clim. an Cours du Pleist., Coll. Int. C. N. R. S., 219: 203-209.
Shackleton, N. J., Berger, A., Peltier, W. R., 1990. An alterna-tive astronomical calibration of the lower Pleistocene times-cale based on ODP Site 677. Trans. R. Soc. Edinburgh EarthSci., 81: 251-261. doi: 10.1017/S0263593300020782
Shackleton, N. J., Hall, N. J., Pate, D., 1995. Pliocene stable i-sotope stratigraphy of Site 846. In: Pisias, N. G., Mayer, L. A., Janecek, T. R., et al., eds., Proc. ODPSci. Results, 138, 337-355.
Tian, J., Wang, P. X., Chen, X. R., et al., 2002. A stronomical ly tuned Plio-Pleistocene benthic δ¹⁸O records from South China Sea and Atlantic-Pacific comparison. Earth and Planeta-ry Science Letters, 203: 1015-1029. doi: 10.1016/S0012-821X(02)00923-8
Tiedemann, R., Sarnthein, M., Shackleton, N. J., 1994. Astro-nomic timescale for the Pliocene Atlantic δ¹⁸O and dust flux records from Ocean Drilling Program Site 659. Paleoceanog-raphy, 9: 619-638. doi: 10.1029/94PA00208
[10]	Wang, P. X., Prell, W. L., Blum, P., et al., 2000. Proceedings of the ocean drilling program, initial reports 184. Ocean Drilling Program College Station, TX, 15-18.