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    孟加拉湾深海记录中的等深流活动特征及其环境意义初探

    方念乔 陈萍 吴琳 石峰

    方念乔, 陈萍, 吴琳, 石峰, 2002. 孟加拉湾深海记录中的等深流活动特征及其环境意义初探. 地球科学, 27(5): 570-575.
    引用本文: 方念乔, 陈萍, 吴琳, 石峰, 2002. 孟加拉湾深海记录中的等深流活动特征及其环境意义初探. 地球科学, 27(5): 570-575.
    FANG Nian-qiao, CHEN Ping, WU Lin, SHI Feng, 2002. Contour Currents in Deep-Water Records from Bay of Bengal and Its Environmental Implication. Earth Science, 27(5): 570-575.
    Citation: FANG Nian-qiao, CHEN Ping, WU Lin, SHI Feng, 2002. Contour Currents in Deep-Water Records from Bay of Bengal and Its Environmental Implication. Earth Science, 27(5): 570-575.

    孟加拉湾深海记录中的等深流活动特征及其环境意义初探

    基金项目: 

    国家自然科学基金主任基金 40170614

    国家“973”项目 G2000046705

    详细信息
      作者简介:

      方念乔(1950-), 男, 教授, 博士生导师, 主要从事沉积学、地层学和海洋地质学的研究工作

    • 中图分类号: P736.2

    Contour Currents in Deep-Water Records from Bay of Bengal and Its Environmental Implication

    • 摘要: 实地观测和对沉积记录的研究表明, 孟加拉湾存在强大的等深流活动.通过采自孟加拉深海扇东部和中部的3支活塞岩心的沉积学研究表明, 那些氧化色彩强烈、钙质生物壳体溶蚀严重、不存在粒序层理的粉砂质薄层实际上是等深积作用的产物.源自两极的等深流是全球温盐循环系统的关键组分, 它们在过去15 0ka的历史中曾经多次得到强化, 不仅对研究区的环境变化产生重要影响, 而且可能作为纽带, 加强了低纬地区与极区在气候意义上的遥相关.等深流的强化与冰川旋回之间似乎不存在密切关联, 氧同位素第3, 4, 5期内均可发现明显的强化记录.关于强化的控制机制有待深入探讨.

       

    • 图  1  孟加拉深海扇细粒沉积物的粒度分布

      a.半远洋沉积物; b.浊积物; c.等深积物; d.等深积物

      Fig.  1.  Granulometric distribution of fine-grained sediments from the Bengal deep-sea fan

      图  2  细粒浊积物和等深积物在研究岩心中的分布

      1~7.氧同位素分期

      Fig.  2.  Distribution of the fine-grained turbidite and contourite in the studied cores

      图  3  等深流在孟加拉湾的影响范围

      a.当代(据Kolla等[9]资料编绘); b.等深流强化期(据沉积记录推断)

      Fig.  3.  Area influenced by the contour currents in the Bay of Bengal

      图  4  MD81349 (孟加拉扇区) 等深流记录与东经90°海岭记录的对比

      Fig.  4.  Correlation of the contour current records of MD81349 from the Bengal fan to ones of the Ninety east Ridge

      表  1  研究岩心的位置和长度

      Table  1.   Location and length of the studied piston cores

    • [1] Stow D A V, Piper D J W. Deep-water fine-grained sediments: facies models[A]. In: Stow D A V, Piper D J W, eds. Fine-grained sediments: deep-water processes and facies[C]. [s. n. ]: Blackwell Sci Publ, 1984. 611-646.
      [2] Heezen B C, Hollister C D. The face of the deep[M]. New York: Oxford University Press, 1971. 650.
      [3] Stow D A V, Lovell J P B. Contourites: their recognition in modern and ancient sediments[J]. Earth-Science Reviews, 1979, 14: 251-291. doi: 10.1016/0012-8252(79)90002-3
      [4] Shanmugam G. 50 years of turbidite paradigm(1950s-1990s): deep water processes and facies models—a critical perspective[J]. Marine and Petroleum Geology, 2000, 17: 285-342. doi: 10.1016/S0264-8172(99)00011-2
      [5] Eving M, Thorndike E M. Suspended matter in deep ocean water[J]. Science, 1965, 147: 1291-1294. doi: 10.1126/science.147.3663.1291
      [6] Heezen B C, Hollister C D, Ruddiman W F. Shaping of the continental rise by deep geostrophic contour currents [J]. Science, 1966, 152: 502-508. doi: 10.1126/science.152.3721.502
      [7] Hollister C D, Heezen B C. Geologic effects of ocean bottom currents: western Nirth Atlantic[A]. In: Gordon A L, ed. Studies in physical oceanography[C]. [s. n. ]: Gordon Breach Sci Publ, 1972. 37-66.
      [8] Stow D A V, Faugeres J C, Viana A, et al. Fossil contourite: a critical review[J]. Sedimentary Geology, 1998, 115: 3-31. doi: 10.1016/S0037-0738(97)00085-7
      [9] Kolla V, Moore D G, Curray J R. Recent bottom-current activity in the deep western Bay of Bengal[J]. Marine Geology, 1976, 21: 255-270. doi: 10.1016/0025-3227(76)90010-4
      [10] 方念乔. Rivière粒度资料解释法在孟加拉深水扇沉积物流体动力分析中的应用[J]. 地质论评, 1992, 32 (4): 344-351. doi: 10.3321/j.issn:0371-5736.1992.04.007

      FANG N Q. The application of the Revière granulometric method to the analysis of the fine sediments of the Bengal deep-water fan[J]. Geological Review, 1992, 32(4): 344-351. doi: 10.3321/j.issn:0371-5736.1992.04.007
      [11] Hovan S A, Rea D K. The Cenozoic of continental mineral deposition on Broken and Ninetyeast Ridges, Indian Ocean: Southern African aridity and sediment delivery from the Himalayas[J]. Paleoceanography, 1992, 7: 833-860. doi: 10.1029/92PA02176
      [12] Chen J, Farrell J W, Murray D W, et al. Timescale and paleonceanographic implications of a 3.6 M. y. oxygen isotope record from the northeast Indian Ocean(ocean drilling program site 758)[J]. Paleoceangraphy, 1995, 10: 21-47. doi: 10.1029/94PA02290
      [13] Stow D A V, Amano K, Balson P S, et al. Sediment facies and process on the distal Bengal fan[J] Proc ODP Sci Results, 1990, 116: 377-396.
      [14] Stanley D J. Turbidites reworked by bottom currents upper Cretaceous examples from St. Croix, US Virgin Islands, Smithosonian contribution[J]. Marine Science, 1987, 22: 79.
      [15] Mutti E. Turbidite systems and their relations to depositioal sequences[A]. In: Zuffa G G, ed. Turbidite sandstones[C]. Milan: Agip Special Publication, 1989. 65-93.
      [16] Shanmugam G, Spalding T D, Rofheart D H. Process sedimentology and reservoir quality of deep-marine bottom-current reworked sands(sandy contourite): an example from the Gulf of Mexico[J]. AAPG Bulletin, 1990, 77: 1241-1259.
      [17] Normark W P. Fan valleys, channels and depositional lobes on modern submarine fans: characters for recognition of sandy turbidite environments[J]. AAPG Bulletin, 1993, 54: 2170-2195.
      [18] Fang N Q, Chen X F, Hu C Y, et al. Rapid climatic change during past 60 ka recorded in NE Indian Ocean and its correspondence from South China Land[J]. Journal of China University of Geosciences, 2000, 11(3): 252-258.
      [19] 方念乔, 丁旋, 陈学方, 等. 孟加拉湾MD77190柱状样第3期的韵律沉积记录及快速气候变化[J]. 第四纪研究, 1999, 19(6): 511-577. doi: 10.3321/j.issn:1001-7410.1999.06.003

      FANG N Q, DING X, CHEN X F, et al. Rapid climatic change in oxygen isotope stage 3: evidence from the rhythmic sedimentary record in core MD77190, Bengal Bay[J]. Quaternary Sciences, 1999, 19(6): 511-577. doi: 10.3321/j.issn:1001-7410.1999.06.003
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    出版历程
    • 收稿日期:  2002-07-30
    • 刊出日期:  2002-09-25

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