| Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance |
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| 作者姓名： | GE Shulan SHI Xuefa ZHU Rixiang LIU Yanguang YIN Ping LIU Lejun |
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| 作者单位： | [1]Key Lab of Marine Sedimentation and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China [2]Institute of Geology and Geophysics, Chinese Acadelny of Sciences, Beijing 100029, China |
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| 基金项目： | MS and hysteresis loop are finished by Zhou Canfen at Paleomagnetism Lab in Institute of Geology and Geophysics, CAS. Special thanks should be given to research fellow Huang Baochun in experiment and data processing and also to He Jingli and Shi Caidong for the aid in experiment. This work was supported by the National Natural Science Foundation of China （Grant Nos. 40431002 and 40574029） and Youth Foundation of State 0ceanic Administration （Grant No. 2004303）. |
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| 摘 要： | Various media are used for the study of paleoenvi- ronment. Among them, ice-core, loess and marine sediments are the most important for long time re- cording1]. In all kinds of researches of paleoenviron- ment, age determination of the sediments is the m…
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| 关 键 词： | 磁地层学 钻井 黄海 岩石磁性 M/B极性边界 磁化率 |
| 文章编号： | 10.1007/s11434-006-0855-4 |
| 收稿时间： | 2004-12-24 |
| 修稿时间： | 2004-12-242005-06-15 |
Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance |
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| GE Shulan SHI Xuefa ZHU Rixiang LIU Yanguang YIN Ping LIU Lejun.Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance[J].Chinese Science Bulletin,2006,51(7):855-865. |
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| Authors: | Shulan Ge Xuefa Shi Rixiang Zhu Yanguang Liu Ping Yin Lejun Liu |
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| Institution: | (1) Key Lab of Marine Sedimentation and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China;(2) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China |
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| Abstract: | Detailed rock magnetic and paleomagnetic studies have been undertaken on borehole EY02-2 (70m in length) in the southern Yellow
Sea (SYS). The main Curie point revealed by magnetic susceptibility-temperature (k-T) curve is 580–600°C indicating magnetite dominance. The hysteresis loop parameters show large variation of magnetic mineral
size in different sedimentary contexts: it is larger in subtidal sediment than in terrigenous sediment and even larger than
in shallow sea sediment. This trend is correlative with distance to sediment source and dynamic strength. Magnetostratigraphic
results show that the M/B polarity boundary (MBPB) is at 63.29m and there are at least 7 polarity transitions (Nr1-7) in Brunhes
chron that can be tentatively correlated with 6 named polarity reversals. Three positive polarity reversals occur in late
Matuyama chron and the early two may be the record of Kamikatsura happening in 886±3 kaB.P. Magnetic susceptibility (MS) and
sediment grain size behave so differently in some sedimentary facies that certain big environmental changes can be clearly
revealed. Generally, the MS and grain size of subtidal and terrigenous sediments are larger than shallow sea sediments and
MS value around 10×10−5SI and mean grain size of 7ϕ seems to be indicators of shallow sea sediments of deep water depth. However, the frequently
used excellent climatic proxies such as MS and grain size in loess and deep sea sediments fail to record such climatic cycles
revealed by oxygen isotope in continental sea. The various sediment sources, sedimentation dynamic and their complex changes
between glacial and interglacial periods should be the cause of failure. |
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| Keywords: | central Yellow Sea mud rock magnetism and magneto- stratigraphy borehole EY02-2 M/B polarity boundary magnetic susceptibility |
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