南海南部近50万年来沉积物特点及古环境意义

梅西, 郑洪波, 黄恩清, 陈国成, 谢昕

梅西, 郑洪波, 黄恩清, 陈国成, 谢昕. 南海南部近50万年来沉积物特点及古环境意义[J]. 海洋地质与第四纪地质, 2007, 27(4): 77-84.
引用本文: 梅西, 郑洪波, 黄恩清, 陈国成, 谢昕. 南海南部近50万年来沉积物特点及古环境意义[J]. 海洋地质与第四纪地质, 2007, 27(4): 77-84.
MEI Xi, ZHENG Hong-bo, HUANG En-qing, CHEN Guo-cheng, XIE Xin. CHARACTERISTICS OF SEDIMENTS IN THE SOUTHERN SOUTH CHINA SEA DURING LAST 500 kA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCESl[J]. Marine Geology & Quaternary Geology, 2007, 27(4): 77-84.
Citation: MEI Xi, ZHENG Hong-bo, HUANG En-qing, CHEN Guo-cheng, XIE Xin. CHARACTERISTICS OF SEDIMENTS IN THE SOUTHERN SOUTH CHINA SEA DURING LAST 500 kA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCESl[J]. Marine Geology & Quaternary Geology, 2007, 27(4): 77-84.

南海南部近50万年来沉积物特点及古环境意义

基金项目: 

"中荷科技联盟"项目(2004CB720506)

国家自然科学基金项目(40676033)

详细信息
    作者简介:

    梅西(1981-),男,硕士生,主要从事海洋地质与古海洋学研究,E-mail:meassy@gmail.com

  • 中图分类号: 736736.2

CHARACTERISTICS OF SEDIMENTS IN THE SOUTHERN SOUTH CHINA SEA DURING LAST 500 kA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCESl

  • 摘要: 对南海南部MD05-2897孔沉积物的分析显示,该孔涵盖氧同位素1~12期,底界年龄约为50万年。碳酸钙含量曲线形态基本与底栖有孔虫氧同位素曲线平行,即碳酸钙高值对应氧同位素轻值,呈现典型的大西洋型碳酸钙分布模式。碳酸钙含量在冰消期的高值出现及含量变化均领先于氧同位素,证明低纬海区"碳酸钙泵"对大气二氧化碳浓度和温度的作用。粒度分析显示,3~5 μm组分含量曲线的变化与氧同位素曲线基本平行,说明它主要受海平面升降变化控制,可作为海平面变化的间接指标。而1.5~2.5 μm粒级颗粒主要通过河流的悬浮搬运,直接受亚洲夏季风及其所带来降雨的影响,可间接反映夏季风的强弱变化。南海南部深海沉积中的季风记录具有0.1 Ma偏心率周期,40 ka斜率周期,20 ka岁差和10 ka半岁差周期等丰富的频谱,显示出低纬度海区气候变化对轨道周期的良好响应。
    Abstract: Study of sediment samples from the southern South China Sea core MD05-2897 (08°49.53' N,111°26.51' E,water depth 1 658 m,core-length 30.98 m)indicates that the core covers a complete sequence of MIS1-12 with the age of about 500 ka at the core bottom. The carbonate content curve runs mostly parallel to the benthic foraminiferal δ18O curve, showing that the higher values of CaCO3 content correspond to the lower δ18O values. The CaCO3 cycle in this area is mainly influenced by terrigenous dilution, displaying the "type of Atlantic Ocean". Both the appearance of CaCO3 peaks and content change are found earlier than oxygen isotope during deglacial periods, indicating the effect of "Carbonate Pump" on CO2 and temperature in the lower latitude sea area. The content curve of terrigenous clasts (grain-size 3~5 μm) is parallel to the oxygen isotope curve and mainly controlled by sea level change, which can be used as an indirect index for sea-level changing. The sediments with grain-size of 1.5~2.5 μm are mainly suspended in water and transported by river, and their content is influenced by the Asia Summer Monsoon and precipitation, so it might reflect the change of the summer monsoon intensity. By the spectrum analysis, the 0.1 Ma eccentricity, 40 ka obliquity, 20 ka precession and 10 ka semi-precession cycles are all recognized in the monsoon records of marine sediments in the southern South China Sea, showing the high response of the tropic sea area climate changes to the orbital cycle.
  • [1]

    Wang P, Wang L, Bian Y, et al. Late Quaternary paleoceanography of the South China Sea:surface circulation and carbonate cycles[J]. Marine Geology, 1995, 127:145-165.

    [2]

    Wang L, Sarnthein M, Erlenkeuser H, et al. East Asian monsoon climate during the Late Pleistocene:high-resolution sediment records from the South China Sea[J]. Mar. Geol., 1999, 156:245-284.

    [3]

    Jian Z, Huang B, Kuhnt W, et al. Late Quaternary upwelling intensity and East Asian Monsoon forcing in the South China Sea[J]. Quaternary Research, 2001, 55:363-370.

    [4]

    Tamburini F, Adatte T, F llmi K, et al. Investigating the history of East Asian monsoon and climate during the last glacial interglacial period (0~140000 years):mineralogy and geochemistry of ODP Sites 1143 and 1144, South China Sea[J]. Mar. Geol., 2003, 201:147-168.

    [5] 陈木宏,涂霞,郑范,等. 南海南部近20万年来沉积序列与古气候变化关系[J].科学通报,2000,45(5):542-548.

    [CHEN Mu-hong, TU Xia, ZHENG Fan. Relations between sedimentary sequence and paleoclimatic changes during last 200 ka in the southern South China Sea[J]. Chinese Sci. Bull., 2000, 45(55):42-548.]

    [6]

    Imbrie J, Hays J D, Martinson D G, et al. The orbital theory of Pleistocene climate:support from revised chronology of the marine δ18O record[C]//Milankovitch and Climate. Holland:D. Reidel, 1984.

    [7] 汪品先.西太平洋边缘海的冰期碳酸盐旋回[J].海洋地质与第四纪地质,1998, 18(1):1-11.

    [WANG Pin-xian, Glacial carbonate cycles in western Pacific marginal seas[J]. Marine Geology and Quaternary Geology,1998, 18(1):1-11.]

    [8] 刘志飞, Colin C, Trentesaux A, 等. 南海南部晚第四纪东亚季风演化的粘土矿物记录[J].中国科学D辑,2004,34(3):272-279.

    [LIU Zhi-fei, Colin C, Trentesaux A, et al. Clay mineral records of East Asian monsoon evolution during Late Quaternary in the southern South China Sea[J].Sci. in China(Ser. D), 2004, 34(3):272-279.]

    [9] 汪品先. 十五万年来的南海[M].上海:同济大学出版社.1995.[WANG Pin-xian. South China Sea Since 150000 Years[M]. Shanghai:Tongji University Press, 1995.]
    [10] 刘志飞,徐建,田军,等. 南海第四纪冰期旋回中的碳酸钙泵[J]. 科学通报, 2003, 48(9):962-968.

    [LIU Zhi-fei, XU Jian, TIAN Jun, et al. "Carbonate pump" during Quaternary glacial/interglacial cycles in the South China Sea[J]. Chinese Sci. Bull., 2003, 48(9):962-968.]

    [11]

    Peterson L C, Prell W L. Carbonate preservation and rates of climatic change:an 800kyr record from the Indian Ocean[C]//The Carbon Cycle and Atmospheric CO2:Nature Variations Archean to Present. Washington D C:AGU Geophys Monogr 32, 1985. 251-269.

    [12] 杨小强, 李华梅, 周永章.南海南部NS93-5孔沉积物磁化率特征及其对全球气候变化的记录[J].海洋地质与第四纪地质,2002, 22(1):31-36.

    [YANG Xiao-qiang, LI Hua-mei, ZHOU Yong-zhang. Magnetic susceptibillty oscillation and unstable climate events of core NS93-5 from South China Sea[J]. Marine Geology and Quaternary Geology, 2002, 22(1):31-36.]

    [13] 刘东生, 丁仲礼. 250万年来季风环流与大陆冰量变化的阶段性耦合过程[J]. 第四纪研究, 1992,12(1):12-23.

    [LIU Tung-sheng, DING Zhong-li. Stepwise coupling of monsoon circulations to glacial ice volume variations since the last 2. 5Ma[J]. Quat. Sci., 1992, 12(1):12-23.]

    [14] 孙东怀, 安芷生, 苏瑞侠, 等. 古环境中沉积物粒度组分分离的数学方法及其应用[J].自然科学进展,2001,11(3):269-276.

    [SUN Dong-huai, AN Zhi-sheng, SU Rui-xia,et al. Mathematical approach to sedimentary component partitioning of polymodal sediments and its applications[J]. Progr. Nat. Sci., 2001, 11(3):269-276.]

    [15]

    Prins M A, Postma G, Weltje G. Controls on the terrigenous sediment supply to the Arabian Sea during the late Quaternary:The Maskran continental slop[J]. Mar. Geol., 2000, 169:351-371.

    [16]

    WANG L, Sarnthein M. East Asian monsoon climate during the Later Pleistocene:high-resolution sediment records from the South China Sea[J]. Mar. Geol., 1999, 156:245-284.

    [18]

    Liu Z, Colin C, Trentesaux A, et al. Erosional history of the eastern Tibetan Plateau over the past 190 kyr:clay mineralogical and geochemical investigations from the southwestern South China Sea[J]. Mar. Geol., 2004, 209:1-18.

    [19] 刘志飞,Colin C. 青藏高原东部和湄公河盆地晚第四纪风化剥蚀与东亚季风演化在南海中的记录[J]. 矿物岩石地球化学通报,2005,24(1):30-38.

    [LIU Zhi-fei, Colin C, et al. Late Quaternary weathering and erosion of the eastern Tibetan Plateau and the Mekong Basin and East Asian monsoon evolution recorded by the sediments from the South China Sea[J]. Bull. Mineral. Petrol. Geoch., 2005, 24(1):30-38.]

    [20] 田军,汪品先,成鑫荣,等. 南海ODP1143站上新世至更新世天文年代标尺的建立[J]. 地球科学,2005,30(1):31-39.

    [TIAN Jun, WANG Pin-xian, CHENG Xin-rong, et al. Establishment of the Plio-Pleistocene astronomical time scale of ODP Site 1143, southern South China Sea[J]. Earth Sci. J. China Univ. Geosci.,2005, 30(1):31-39.]

    [21]

    Ding Z L, Yu Z W, Rutter N W, et al. Towards an orbital time scale for Chinese loess deposits[J]. Quat. Sci. Rev., 1994, 13:39-70.

    [22] 田军,汪品先. 深海记录中的热带过程及其周期性[J].地球科学, 2006, 31(6):747-753.

    [TIAN Jun, WANG Pin-xian. Tropical process and its periodicity in the deep sea records[J].Earth Sci.J.(China Univ. Geosci.), 2006,31(6):747-753.]

    [23]

    Clemens S C, Prell W, Murray D, et al. Forcing mechanisms of the Indian Ocean monsoon[J]. Nature,1991, 353:720-725.

    [24]

    Wehausen R, Brumsack H J. Astronomical forcing of the East Asian monsoon mirrored by the composition of Pliocene South China Sea sediments[J]. Earth Planet. Sci. Lett., 2002, 201:621-636.

计量
  • 文章访问数:  1404
  • HTML全文浏览量:  132
  • PDF下载量:  11
  • 被引次数: 0
出版历程
  • 收稿日期:  2007-05-30
  • 修回日期:  2007-06-11

目录

    /

    返回文章
    返回