The fidelity of paleomagnetic records carried by magnetosome chains
文献类型：期刊论文
| 作者 | Paterson, Greig A.; Wang, Yinzhao; Pan, Yongxin |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2013-12-01 |
| 卷号 | 383页码:82-91 |
| 关键词 | magnetotactic bacteria sedimentary magnetism relative paleointensity magnetofossils magnetic interactions |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2013.09.031 |
| 文献子类 | Article |
| 英文摘要 | Magnetotactic bacteria (MTB), which use aligned chains of magnetosomes (magnetic crystals) as a navigation tool, are found in a wide range of modern day marine, river and lacustrine environments and their fossilized remains are being increasing recognized in geological records. Despite an increasing realization that biogenically derived magnetic particles may play a key role in sedimentary magnetizations, little is known about the influence that they may have on the fidelity of paleomagnetic recordings. Using cultured Magnetospirillum magneticum strain AMB-1, we have conducted simple 2D (i.e., zero-inclination) deposition experiments to assess the efficiency with which magnetosome chains align along magnetic field lines and the implications that this has for paleomagnetic records. Our results indicate that the natural remanent magnetization (NRM) acquired by deposited MTB is near linear with applied field (0-120 mu T), but that NRM acquisition does not perfectly follow the assumed linear trend and over a six-fold increase in applied field only a factor similar to 5.5 increase in NRM intensity is observed (i.e., similar to 9% lower than the assumed trend). Both anhysteretic remanent magnetization (ARM) and saturation isothermal remanent magnetization (SIRM) normalized relative paleointensities (RPIs) can successfully recover field strength variations under identical situations. When the MTB concentration of the initial solution is varied (up to a factor 8), NRM carried by MTB responds in the expected fashion (i.e., a doubling of bacteria produces a doubling of NRM intensity). Both ARM and SIRM, however, do not respond to as expected: A doubling of concentration corresponds to an increase of similar to 1.76 in SIRM intensity and an increase of only similar to 1.63 in ARM intensity. Both are influenced by magnetostatic interactions that arise from the close packing of bacterial cells or subchain interactions within a single bacterial cell. First-order reversal curve (FORC) diagrams, however, are too insensitive to indicate the presence of paleomagnetically relevant magnetic interactions. Remanence based methods (i.e., the ARM ratio) are more appropriate to detect such interactions. (C) 2013 Elsevier B.V. All rights reserved. |
| WOS关键词 | TRANSMISSION ELECTRON-MICROSCOPY ; MAGNETOTACTIC BACTERIA ; RELATIVE PALEOINTENSITY ; BIOGENIC MAGNETITE ; SINGLE-DOMAIN ; GEOMAGNETIC PALEOINTENSITY ; SEDIMENTARY RECORDS ; NATURAL SEDIMENTS ; SUSCEPTIBILITY ; BOOTSTRAP |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000328593500009 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | State Key Laboratory of Lithospheric Evolution (IGGCAS) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; NSFC(41240028) ; NSFC(41240028) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; NSFC(41240028) ; NSFC(41240028) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; NSFC(41240028) ; NSFC(41240028) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; State Key Laboratory of Lithospheric Evolution (IGGCAS) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; NSFC(41240028) ; NSFC(41240028) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/87648]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Paterson, Greig A. |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earths Deep Interior, Paleomagnetism & Geochronol Lab, Beijing 10029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Paterson, Greig A.,Wang, Yinzhao,Pan, Yongxin. The fidelity of paleomagnetic records carried by magnetosome chains[J]. EARTH AND PLANETARY SCIENCE LETTERS,2013,383:82-91. |
| APA | Paterson, Greig A.,Wang, Yinzhao,&Pan, Yongxin.(2013).The fidelity of paleomagnetic records carried by magnetosome chains.EARTH AND PLANETARY SCIENCE LETTERS,383,82-91. |
| MLA | Paterson, Greig A.,et al."The fidelity of paleomagnetic records carried by magnetosome chains".EARTH AND PLANETARY SCIENCE LETTERS 383(2013):82-91. |
入库方式： OAI收割
来源：地质与地球物理研究所
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