| ANISOTROPY OF MAGNETIC SUSCEPTIBILITY AND IDENTIFICATION OF TILTED SEDIMENT CORES FROM THE BOHAI SEA |
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| 作者姓名： | 陈灏 孙维敏 张宏才 |
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| 作者单位： | CHEN Hao(Dept of Geology and Geophysics，University of Edinburgh，Edinburgh EH9 3JW. UK)SUN Wei-min ZHANG Hong-cai(Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071) |
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| 基金项目： | The project was suppoted by National Natural Science Foundation of China(No.49070189)and the Bntish Council(ALCS SCEHEME-PEK/992/108) |
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| 摘 要： | Anisotropy of magnetic susceptibility (AMS) is a well-developed technique increaseingly used in petro-fabric determination. ItS application to two Mackereth cores JX91-2A and JX91-2B, taken from thesame site in the central Bohai Sea, revealed 3D magnetic fabrics of the sediments as expressed with susce-ptibility ellipsoids. The flat seafloor and the relatively quiet depositional environment in the semi-isolatedBohai Sea should asult in a primary fabric with horisontally obate susocptibility el1ipsoids. Mormwr,the inaxing downcore totaI anisotropy comprising mainly of magntic foliation nsulting fIrom sedimentcompaction should also lead to flat ellipsoids. Therefore, the off-pole meam dindions of minimurn axes ofaseptibility ellipsoids on stermnets must indicate that the two coas are ti]ted re1ative to the flat anfloor.Use of Fisher statisties showh the tilt angles to be 14° for JX91-2A and 23°for JX91 -2B from whichthe tna depths of the coas were dedded accordingly.
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| 收稿时间： | 16 May 1995 |
| 修稿时间： | 18 September 1995 |
Anisotropy of magnetic susceptibility and identification of tilted sediment cores from the Bohai Sea |
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| Chen Hao,Sun Wei-min,Zhang Hong-cai.ANISOTROPY OF MAGNETIC SUSCEPTIBILITY AND IDENTIFICATION OF TILTED SEDIMENT CORES FROM THE BOHAI SEA[J].Chinese Journal of Oceanology and Limnology,1996,14(2):135-140. |
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| Authors: | Chen Hao Sun Wei-min Zhang Hong-cai |
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| Institution: | (1) Dept of Geology and Geophysics, University of Edinburgh, EH9 3JW Edinburgh, UK;(2) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao |
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| Abstract: | Anisotropy of magnetic susceptibility (AMS) is a well-developed technique increasingly used in petro-fabric determination.
Its application to two Mackereth cores JX91-2A and JX91-2B, taken from the same site in the central Bohai Sea, revealed 3D
magnetic fabrics of the sediments as expressed with susceptibility ellipsoids. The flat seafloor and the relatively quiet
depositional environment in the semi-isolated Bohai Sea should result in a primary fabric with horizontally oblate susceptibility
ellipsoids. Moreover, the increasing downcore total anisotropy comprising mainly of magnetic foliation resulting from sediment
compaction should also lead to flat ellipsoids. Therefore, the off-pole mean directions of minimum axes of susceptibility
ellipsoids on stereonets must indicate that the two cores are tilted relative to the flat seafloor. Use of Fisher statistics
showed the tilt angles to be 14° for JX91-2A and 23° for JX91-2B from which the true depths of the cores were decided accordingly.
Contribution NO. 2859 from the Institute of Oceanology, Chinese Academy of Sciences.
This project was supported by National Natural Science Foundation of China (No. 49070189) and the British
Council (ALCS SCEHEME-PEK/992/180). |
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| Keywords: | Bohai Sea anisotropy of magnetic susceptibility sediment core |
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