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| 三门峡地区黄土与古季风 | |
| 引用本文： | 赵志中,吴锡浩.三门峡地区黄土与古季风[J].地质力学学报,2000,6(4):19-26,66. |
| 作者姓名： | 赵志中 吴锡浩 |
| 作者单位： | 1. 中国地质科学院地质力学研究所,北京,100081 2. 中国地质科学院地质力学研究所,北京,100081;中国科学院黄土与第四纪地质国家重点实验室,西安,710054 3. 中国地质科学院地质力学研究所,北京,100081;中国科学院湖泊沉积与环境开放研究实验室,南京,210008 4. 中国科学院湖泊沉积与环境开放研究实验室,南京,210008 5. 中国科学院湖泊沉积与环境开放研究实验室,南京,210008;中国科学院黄土与第四纪地质国家重点实验室,西安,710054 |
| 基金项目： | 国家重点基础研究发展计划(973计划),中国科学院资助项目,中国科学院重大项目,G1999043401,49972060,KZ951-A1-402-04,,, |
| 摘 要： | 位于黄土高原东南缘的三门峡黄土地层,以陕县张汴乡村剖面为其典型代表。厚度１５３ｍ的曹村剖面由上部厚１４５ｍ的黄土地层和下伏红粘土沉积组成,黄土地层为Ｌ１－Ｌ３３的连续风尘沉积。磁性地层研究显示：Ｂ／Ｍ界线位于Ｌ７下部,Ｊ事件位于Ｓ１１／Ｓ１２,Ｏ事件位于Ｌ２３－Ｌ２６,Ｍ／Ｇ界线位于黄土与红粘土界线之上２０ｃｍ处。古季风代用指标的磁化率、碳酸盐及〉３０μｍ的粒度组分均显示了约２．６Ｍａ以来季风变迁 |
| 关 键 词： | 三门峡 黄土 磁性地层 古季风记录 时间标尺 |
| 收稿时间： | 2000/9/20 0:00:00 |
THE LOESS STRATIGRAPHY IN SANMENXIA AREA |
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| ZHAO Zhi-zhong,WU Xi-hao,JIANG Fu-chu,XIAO Hua-guo,WANG Shu-bing,TIAN Guo-qiang,LIU Ke,YIN Wei-de,XUE Bing,WANG Su-min.THE LOESS STRATIGRAPHY IN SANMENXIA AREA[J].Journal of Geomechanics,2000,6(4):19-26,66. | |
| Authors: | ZHAO Zhi-zhong WU Xi-hao JIANG Fu-chu XIAO Hua-guo WANG Shu-bing TIAN Guo-qiang LIU Ke YIN Wei-de XUE Bing WANG Su-min |
| Institution: | Institute of Geomechanics, CAGS, Beijing 100081, China,Institute of Geomechanics, CAGS, Beijing 100081, China;State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xian 710054, China,Institute of Geomechanics, CAGS, Beijing 100081, China;Open Laboratory of Lake Sediment and Environment, Chinese Academy of Sciences, Nanjing 210008, China,Institute of Geomechanics, CAGS, Beijing 100081, China,Institute of Geomechanics, CAGS, Beijing 100081, China,Institute of Geomechanics, CAGS, Beijing 100081, China,Institute of Geomechanics, CAGS, Beijing 100081, China,Institute of Geomechanics, CAGS, Beijing 100081, China,Open Laboratory of Lake Sediment and Environment, Chinese Academy of Sciences, Nanjing 210008, China and Open Laboratory of Lake Sediment and Environment, Chinese Academy of Sciences, Nanjing 210008, China;State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xian 710054, China |
| Abstract: | The Caocun loess profile in Zhangbian township located at the southeast margin of the Loess Plateau is typical of the Sanmenxia area. In the profile there occurs a loess-paleosol sequence from L1 to L33 145m thick,underlain by a red clay bed. The B/M boundary was recorded at the bottom of L7,the J magnetic event at S11 to S12,the O magnetic event at L23 to L26,and the M/G boundary at the bottom of L33 near the red clay. The magnetic susceptibility of the loess deposits,as well as the carbonates and macrograined components contained all indicate that there have been many periodic monsoon changes totalling 13 cold events,with each lasting more than 40000 years. A high-resolution chronostratigraphy of the profile has been established by an age model according to grains. There exists a clear correlation between the records of paleomonsoon in the Caocun loess succession and SPECMAP from 3×105-year BP to the present. |
| Keywords: | Sanmenxia loess magnetostratigraphy records of paleomonsoon correlation between land and sea |
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