The detection of bacterial magnetite in recent sediments of Lake Chiemsee (southern Germany)
文献类型：期刊论文
| 作者 | Pan, YX; Petersen, N; Davila, AF; Zhang, LM; Winklhofer, M; Liu, QS; Hanzlik, M; Zhu, RX |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2005-03-30 |
| 卷号 | 232期号:1-2页码:109-123 |
| 关键词 | Rock Magnetism Biogenic Magnetite Delta Ratio Remanence Coercivity Spectrum Lake Chiemsee |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2005.01.006 |
| 文献子类 | Article |
| 英文摘要 | The sediments of Lake Chiemsee, located in the Alpine foreland in Southern Germany, host a variety of magnetotactic bacteria (MTB), which contain intracellular crystals of magnetite arranged in linear chains. To detect bacterial magnetite in the carbonate-dominated surface sediments and further quantify its contribution to the magnetic signal of the sediments, we conducted detailed rock magnetic measurements as well as complimentary non-magnetic analyses (electron microscopy, powder X-ray diffraction, and sediment pore-water analysis). Our results demonstrate that biogenic single-domain magnetite (characterized by bullet- and truncated hexagonal prismatic shapes) is the dominant ferrimagnetic component in the topmost few centimetres of the sediment. The changes of magnetic properties with depth are due to the occurrence of live MTB and the downward increasing dissolution of biogenic magnetite. Moreover, the ratios of remanence loss on warming through the Verwey transition after field cooling and zero-field cooling of saturation isothermal remanence (delta(FC)/delta(ZFC)) were determined as 1.47 and 1.25 for freeze-dried and air-dried sediment samples containing MTB, respectively. These low ratios suggest that the bacterial magnetite chains were disrupted to a large extent and/or that the bacterial magnetosomes might have undergone partial low-temperature oxidation. It is proposed that although rock magnetic measurements are suitable for quantifying the contribution of fine-grained particles to the overall magnetic signal of sediments, complementary non-magnetic methods are essential to unambiguously identify its bacterial origin. (c) 2005 Elsevier B.V. All rights reserved. |
| WOS关键词 | DEEP-SEA SEDIMENTS ; MAGNETOTACTIC BACTERIA ; BIOGENIC MAGNETITE ; VERWEY TRANSITION ; MARINE-SEDIMENTS ; BIOMINERALIZATION ; MAGNETOFOSSILS ; MAGNETOSOMES ; FINE ; NONSTOICHIOMETRY |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000228158800010 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/64951]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Pan, YX |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab LTE, Beijing 100029, Peoples R China 2.Univ Munich, Dept Earth & Environm Sci, D-80333 Munich, Germany 3.Univ Minnesota, Inst Rock Magnetism, Minneapolis, MN 55455 USA 4.Tech Univ Munich, Dept Chem, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Pan, YX,Petersen, N,Davila, AF,et al. The detection of bacterial magnetite in recent sediments of Lake Chiemsee (southern Germany)[J]. EARTH AND PLANETARY SCIENCE LETTERS,2005,232(1-2):109-123. |
| APA | Pan, YX.,Petersen, N.,Davila, AF.,Zhang, LM.,Winklhofer, M.,...&Zhu, RX.(2005).The detection of bacterial magnetite in recent sediments of Lake Chiemsee (southern Germany).EARTH AND PLANETARY SCIENCE LETTERS,232(1-2),109-123. |
| MLA | Pan, YX,et al."The detection of bacterial magnetite in recent sediments of Lake Chiemsee (southern Germany)".EARTH AND PLANETARY SCIENCE LETTERS 232.1-2(2005):109-123. |
入库方式： OAI收割
来源：地质与地球物理研究所
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