| 中国黄土与红色粘土记录的地磁极性界限及地质意义 |
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| 引用本文： | 岳乐平.中国黄土与红色粘土记录的地磁极性界限及地质意义[J].地球物理学报,1995,38(3):311-320. |
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| 作者姓名： | 岳乐平 |
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| 作者单位： | 西北大学地质系, 西安 710069 |
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| 摘 要： | 本文报道由蓝田、陕县、洛川、西峰、平凉、兰州及靖远等剖面获得的古地磁研究结果．主要结论为：１．中国黄土剖面记录了Ｂｒｕｎｈｅｓ正极性带与Ｍａｔｕｙａｍａ负极性带，Ｂｒｕｎｈｅｓ／Ｍａｔｕｙａｍａ极性转换过程位于第８层黄土（Ｌ８）．在段家坡黄土剖面该转换过程对应的地层厚度为０．３７５ｍ，持续时间约６０００ａ．转换过程由３次极性变化构成，每次经历的时间约为４００ａ．２．Ｊａｒａｍｉｌｌｏ正极性亚带（Ｊ）位于标志层Ｌ９至Ｌ１５之间，大约Ｓ１０－Ｓ１３位置．３．Ｏｌｄｕｖａｉ正极性亚带（Ｏ）对应的地层为Ｓ２７－Ｓ３３４．Ｒｅｕｎｉｏｎ正极性亚带（Ｒ）由两部分组成，在蓝田段家坡黄土剖面分别位于Ｌ３６和Ｓ３８５．Ｍａｔｕｙａｍａ负极性带与Ｇａｕｓｓ正极性带界限（Ｍ／Ｇａ）位于黄土和红色粘土交界处，中国黄土的底界年龄为２．４８Ｍａ左右．黄土与红色粘土为整合接触关系．６．黄土下伏的红色粘土记录了Ｇａｕｓｓ正极性带，Ｇｉｌｂｅｒｔ负极性带和古地磁年表编号５（Ｅｐｏｃｈ５）．
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| 关 键 词： | 古地磁 极性界限 黄土－古土壤 红色粘土 |
| 收稿时间： | 1993-07-16 |
PALAEOMAGNETIC POLARITY BOUNDARY WERE RECORDED IN CHINESE LOESS AND RED CLAY,AND GEOLOGICAL SIGNIFICANCE |
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| YUE LE-PING.PALAEOMAGNETIC POLARITY BOUNDARY WERE RECORDED IN CHINESE LOESS AND RED CLAY,AND GEOLOGICAL SIGNIFICANCE[J].Chinese Journal of Geophysics,1995,38(3):311-320. |
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| Authors: | YUE LE-PING |
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| Institution: | Department of Geology, Northwest university, Xi'an 710069 |
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| Abstract: | This paper presents the results of palaeomagnetism polarity boundary of loesssection in Lantian,Shaanxian,Luochuan.Xifeng,Pingliang,Lanzhou and Jingyuan.The results show:1) Brunhes normal polarity zone and Matuyama reversal polarityzone were recorded in Chinese loess section.The Matuyama-Brunhes transition islocated in the loess layer L8.The thickness of transition is 0.375m,and time is estimated to be about 6000a.The M-B transition field is made up of three reversal,and every reversal is less than 400a.2) Jaramillo normal polarity subzone Is Iocatedbetween marker beds L9 and L15,about in S10-S13. 3) Olduvai normal polaritysubzone is located in S27-S33.4) Reunion normal polarity subzone was found atDuanjiapo loess section of Lantian.The R subzone composed of two parts of R1and R2. The R1 is located L36,and R2 is located S38. 5) Gauss-matuyama boundarycorresponds to loess/red clay boundary.Chinese loess began to form at 2.48 MaB.P.The red clay is underlying formation of loess.6)Gauss normal polarity chron.Gilbert reversal polarity chron and Epoch 5 were recorded in the redclay underthe loess. |
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| Keywords: | Palaeomagnetism Polarity boundary Loess-paleosoil sequence Red clay |
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