孟加拉湾东经90°海岭中上新世以来沉积记录及亚洲季风

张振芳; 方念乔; 吴琳; 王建乔; 刘荣梅

孟加拉湾东经90°海岭中上新世以来沉积记录及亚洲季风

1.
中国地质调查局发展研究中心，北京 100037
2.
中国地质大学地球科学与资源学院，北京 100083

基金项目: “973”国家重点基础研究发展规划项目“青藏高原形成演化及其资源、环境效应”

详细信息

作者简介:
张振芳(1972—)，女，博士，主要从事海洋地质及古环境研究

中图分类号: 534.63; P532
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出版历程
- 收稿日期: 2003-08-04
- 刊出日期: 2004-03-25

Sedimentary Records and Asian Monsoon in Ninetyeast Ridge of Bay of Bengal since Pliocene Time

1.
Development and Research Center, China Geological Survey, Beijing 100037, China
2.
Faculty of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 利用古生物地层学、碳酸盐地层学、X射线粉晶衍射和粒度分析等方法对东北印度洋孟加拉湾东经90°海岭上的远洋沉积物进行了综合研究.在此基础上, 以陆源物质的粒度为切入点对该区的沉积作用、沉积物来源及其可能的搬运机制进行了探讨, 对过去有关研究区陆源物质的源区和搬运方式作了补充.陆源物质的粒度可作为东南季风或赤道东风的替代性指标, 其变化不仅反映源区的火山活动情况, 而且指示了风力的强弱.陆源物质的多少则主要取决于青藏高原和印度次大陆的剥蚀情况和地表径流的强弱.二者之间通过高原隆升及其引发的环境效应联系起来.
- 东经90°海岭 /
- 陆源物质粒度 /
- 碳酸盐地层 /
- 亚洲季风 /
- 中上新世
Abstract: The pelagic sediments of Ninetyeast ridge have been synthetically analyzed through paleobiostratigraphy, carbonate stratigraphy, X-ray crystal powder diffraction and grain size analysis. The grain size of terrigenous sediments has been regarded as a cut-in in the discussion of sedimentation, sources and possible carrying mechanisms of the sediments. The source and carrying pattern of the terrigenous sediments have been supplemented further. The grain size of the terrigenous sediments can serve as an indicator of southeast monsoon or equatorial east wind. Its change not only reflects the volcanic activity of the source region of the terrigenous sediments but also indicates the wind strength. However, the quantity of the terrigenous sediments mainly depends on the erosion of the Tibetan plateau and Indian subcontinent and the runoff. The two aspects have been associated by the uplift of the plateau and its environmental effects.
- Ninetyeast ridge /
- grain size of terrigenous sediment /
- carbonate stratigraphy /
- Asian monsoon /
- Pliocene time

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图 1 研究区地理位置和采样点

1.孟加拉扇的ODP和DSDP钻心; 2.90°E海岭的ODP和DSDP钻心; 3.孟加拉扇的活塞柱状样; 4.90°E海岭和安达曼海山的活塞柱状样

Fig. 1. Location of studied area and sampling sites

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图 2 东印度洋粘土矿物分布(据Kolla and Pierre, 1973)

Fig. 2. Clay mineral provinces and dispersal paths of sediments in eastern Indian Ocean

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图 3 ODP758 30 Ma以来陆源物质通量变化

Fig. 3. Variations in terrigenous mineral accumulation rate in samples from ODP758 plotted versus age

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图 4 ODP758 4~3 Ma及1.15~0.65 Ma碳酸钙含量与粗组分含量对比

Fig. 4. Variations in coarse component and CaCO₃ contents in samples from ODP758 plotted versus age

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表 1 岩心概况

Table 1. Overview of studied bore cores

表 2 3根岩心的沉积物组成变化

Table 2. Sedimentary constitution of the studied bore cores

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