| Use of environmental magnetic measurements to characterize and correlate tephra-A case study in Iceland |
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| 作者姓名： | XIADunsheng J.Bloemendal R.C.Chiverrell J.A.Dearing JINMing |
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| 作者单位： | [1]KeyLaboratoryofDesertandDesertification,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000,China [2]EnvironmentalMagnetismLaboratory,DepartmentofGeography,TheUniversityofLiverpool,Liverpool,L693BX,UK |
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| 摘 要： | A set of environmental magnetic parameters(i.e. magnetic susceptibility, xARM, IRMs, hysteresis loops and thermomagnetic curves) has been applied to two soil sections from SE Iceland. Results demonstrate that the main magnetic minerals in the tephras are ferrimagnetic minerals (e.g.magnetite) and canted antiferromagnetic minerals (e.g.haematite), with abundant paramagnetic material also present. Cross plots of Mrs/Ms vs. (B0)cr/(B0)c and xfd% vs.xARM/SIRM indicate that the main magnetic grain sizes in tephras are pseudo single domain (PSD) and multidomain(MD). Initial correlation of tephra layers was achieved, usingall the measured magnetic parameters, by use of the multi-variate statistical measures of Similarity Coefficient (SC) andEuclidean Distance (ED). This demonstrates that magnetictechniques can potentially assist in the identification andcorrelation of distal tephra.
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| 关 键 词： | 火山灰 冰岛 磁性参数 相似系数 欧几里德距离 |
| 收稿时间： | 2003-09-20 |
| 修稿时间： | 2003-12-01 |
Use of environmental magnetic measurements to characterize and correlate tephra — A case study in Iceland |
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| XIADunsheng J.Bloemendal R.C.Chiverrell J.A.Dearing JINMing.Use of environmental magnetic measurements to characterize and correlate tephra-A case study in Iceland[J].Chinese Science Bulletin,2004,49(3):286-294. |
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| Authors: | Dunsheng Xia J Bloemendal R C Chiverrell J A Dearing Ming Jin |
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| Institution: | XIA Dunsheng, J. Bloemendal, R. C. Chiverrell, J. A. Dealing & JIN Ming Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. Lanzhou 730000, China; Environmental Magnetism Laboratory. Department of Geography, The University of Liverpool, Liverpool, L69 3BX, UK |
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| Abstract: | A set of environmental magnetic parameters (i.e. magnetic susceptibility, XARM IRMs, hysteresis loops and thermomagnetic curves) has been applied to two soil sections from SE Iceland. Results demonstrate that the main magnetic minerals in the tephras are ferrimagnetic minerals (e.g. magnetite) and canted antiferromagnetic minerals (e.g. haematite), with abundant paramagnetic material also present. Cross plots of Mrs/Ms vs. (B0)cr/(B0)c and Xfd% vs. XARM/SIRM indicate that the main magnetic grain sizes in tephras are pseudo single domain (PSD) and multidomain (MD). Initial correlation of tephra layers was achieved, using all the measured magnetic parameters, by use of the multi-variate statistical measures of Similarity Coefficient (SC) and Euclidean Distance (ED). This demonstrates that magnetic techniques can potentially assist in the identification and correlation of distal tephra. |
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| Keywords: | environmental magnetism tephra Iceland |
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