Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance  

作　　者：GE Shulan SHI Xuefa ZHU Rixiang LIU Yanguang YIN Ping LIU Lejun 

机构地区：[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

出　　处：《Chinese Science Bulletin》2006年第7期855-865,共11页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40431002 and 40574029);Youth Foundation of State 0ceanic Administration(Grant No.2004303).

摘　　要：Detailed rock magnetic and paleomag- netic 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℃ indicating magnetite dominance. The hysteresis loop parameters show large variation of magnetic minera 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 environmenta 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 excellen 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 seaThe various sediment sources, sedimentation dy- namic and their complex changes between glacial and interglacial periods should be the cause of fail- ure.Detailed rock netic studies have been magnetic and paleomagundertaken 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℃ 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^-5 SI and mean grain size of 7Ф 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.

关 键 词：磁地层学 钻井 黄海 岩石磁性 M/B极性边界 磁化率 

分 类 号：P53[天文地球—古生物学与地层学]